从零开始—仿牛客网讨论社区项目（一）

# ServerProperties
server.port=8080
server.servlet.context-path=/community

# ThymeleafProperties
spring.thymeleaf.cache=false

# DataSourceProperties
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/community?characterEncoding=utf-8&useSSL=false&serverTimezone=Hongkong
#数据库的名称、密码等
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
#最大连接数、超时时间等
spring.datasource.hikari.maximum-pool-size=15
spring.datasource.hikari.minimum-idle=5
spring.datasource.hikari.idle-timeout=30000

# MybatisProperties
#mapper扫描路径
mybatis.mapper-locations=classpath:mapper/*.xml
#在communtiy下创建实体类
mybatis.type-aliases-package=com.nowcoder.community.entity
mybatis.configuration.useGeneratedKeys=true
mybatis.configuration.mapUnderscoreToCamelCase=true
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public class User {

    private int id;
    private String username;
    private String password;
    private String salt;
    private String email;
    private int type;
    private int status;
    private String activationCode;
    private String headerUrl;
    private Date createTime;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getSalt() {
        return salt;
    }

    public void setSalt(String salt) {
        this.salt = salt;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }

    public String getActivationCode() {
        return activationCode;
    }

    public void setActivationCode(String activationCode) {
        this.activationCode = activationCode;
    }

    public String getHeaderUrl() {
        return headerUrl;
    }

    public void setHeaderUrl(String headerUrl) {
        this.headerUrl = headerUrl;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + ''' +
                ", password='" + password + ''' +
                ", salt='" + salt + ''' +
                ", email='" + email + ''' +
                ", type=" + type +
                ", status=" + status +
                ", activationCode='" + activationCode + ''' +
                ", headerUrl='" + headerUrl + ''' +
                ", createTime=" + createTime +
                '}';
    }

}
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@Mapper
public interface UserMapper {

    User selectById(int id);

    User selectByName(String username);

    User selectByEmail(String email);

    int insertUser(User user);

    int updateStatus(int id, int status);

    int updateHeader(int id, String headerUrl);

    int updatePassword(int id, String password);

}
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        username, password, salt, email, type, status, activation_code, header_url, create_time
    

    
        id, username, password, salt, email, type, status, activation_code, header_url, create_time
    

    
        select 
        from user
        where id = #{id}
    

    
        select 
        from user
        where username = #{username}
    

    
        select 
        from user
        where email = #{email}
    

    
        insert into user ()
        values(#{username}, #{password}, #{salt}, #{email}, #{type}, #{status}, #{activationCode}, #{headerUrl}, #{createTime})
    

    
        update user set status = #{status} where id = #{id}
    

    
        update user set header_url = #{headerUrl} where id = #{id}
    

    
        update user set password = #{password} where id = #{id}
    


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public class DiscussPost {

    private int id;
    private int userId;
    private String title;
    private String content;
    private int type;
    private int status;
    private Date createTime;
    private int commentCount;
    private double score;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getUserId() {
        return userId;
    }

    public void setUserId(int userId) {
        this.userId = userId;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public int getCommentCount() {
        return commentCount;
    }

    public void setCommentCount(int commentCount) {
        this.commentCount = commentCount;
    }

    public double getScore() {
        return score;
    }

    public void setScore(double score) {
        this.score = score;
    }

    @Override
    public String toString() {
        return "DiscussPost{" +
                "id=" + id +
                ", userId=" + userId +
                ", title='" + title + ''' +
                ", content='" + content + ''' +
                ", type=" + type +
                ", status=" + status +
                ", createTime=" + createTime +
                ", commentCount=" + commentCount +
                ", score=" + score +
                '}';
    }
}

@Mapper
public interface DiscussPostMapper {

    
    // 考虑到后期分页功能加入offset 和 limit变量
    // @Param注解用于给参数取别名,
    // 如果只有一个参数,并且在里使用,则必须加别名.


    List selectDiscussPosts(int userId, int offset, int limit);
    int selectDiscussPostRows(@Param("userId") int userId);

}
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        id, user_id, title, content, type, status, create_time, comment_count, score
    

    
        select 
        from discuss_post
        where status != 2
        
            and user_id = #{userId}
        
        order by type desc, create_time desc
        limit #{offset}, #{limit}
    

    
        select count(id)
        from discuss_post
        where status != 2
        
            and user_id = #{userId}
        
    


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@Service
public class DiscussPostService {

    @Autowired
    private DiscussPostMapper discussPostMapper;

    public List findDiscussPosts(int userId, int offset, int limit) {
        return discussPostMapper.selectDiscussPosts(userId, offset, limit);
    }

    public int findDiscussPostRows(int userId) {
        return discussPostMapper.selectDiscussPostRows(userId);
    }

}
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//Controller访问路径可以省略
@Controller
public class HomeController {

    //注入对象
    @Autowired
    private DiscussPostService discussPostService;

    @Autowired
    private UserService userService;

    //使用GET方法
    @RequestMapping(path = "/index", method = RequestMethod.GET)


        List list = discussPostService.findDiscussPosts(0, page.getOffset(), page.getLimit());
        List> discussPosts = new ArrayList<>();
        if (list != null) {
            for (DiscussPost post : list) {
                Map map = new HashMap<>();
                map.put("post", post);
                User user = userService.findUserById(post.getUserId());
                map.put("user", user);
                discussPosts.add(map);
            }
        }
        model.addAttribute("discussPosts", discussPosts);
        return "/index";
    }

}
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								寒江雪 发布于 2019-04-15 15:32:18
								

									
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/**
 * 封装分页相关的信息.
 */
public class Page {

    // 当前页码
    private int current = 1;
    // 显示上限
    private int limit = 10;
    // 数据总数(用于计算总页数)
    private int rows;
    // 查询路径(用于复用分页链接)
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if (current >= 1) {
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if (limit >= 1 && limit <= 100) {
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if (rows >= 0) {
            this.rows = rows;
        }
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /**
     * 获取当前页的起始行
     *
     * @return
     */
    public int getOffset() {
        // current * limit - limit
        return (current - 1) * limit;
    }

    /**
     * 获取总页数
     *
     * @return
     */
    public int getTotal() {
        // rows / limit [+1]
        if (rows % limit == 0) {
            return rows / limit;
        } else {
            return rows / limit + 1;
        }
    }

    /**
     * 获取起始页码
     *
     * @return
     */
    public int getFrom() {
        int from = current - 2;
        return from < 1 ? 1 : from;
    }

    /**
     * 获取结束页码
     *
     * @return
     */
    public int getTo() {
        int to = current + 2;
        int total = getTotal();
        return to > total ? total : to;
    }

}
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//Controller访问路径可以省略
@Controller
public class HomeController {

    //注入对象
    @Autowired
    private DiscussPostService discussPostService;

    @Autowired
    private UserService userService;

    //使用GET方法
    @RequestMapping(path = "/index", method = RequestMethod.GET)

    public String getIndexPage(Model model, Page page) {
        // 方法调用钱,SpringMVC会自动实例化Model和Page,并将Page注入Model.
        // 所以,在thymeleaf中可以直接访问Page对象中的数据.
        page.setRows(discussPostService.findDiscussPostRows(0));
        page.setPath("/index");

        List list = discussPostService.findDiscussPosts(0, page.getOffset(), page.getLimit());
        List> discussPosts = new ArrayList<>();
        if (list != null) {
            for (DiscussPost post : list) {
                Map map = new HashMap<>();
                map.put("post", post);
                User user = userService.findUserById(post.getUserId());
                map.put("user", user);
                discussPosts.add(map);
            }
        }
        model.addAttribute("discussPosts", discussPosts);
        return "/index";
    }

}
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效果图如下：

4.开发社区登录模块

4.1邮件发送

在Maven Repository搜索Spring Mail配置文件并加入到poml文件中，在application.properties文件中配置Mail的参数。

# ServerProperties
server.port=8080
server.servlet.context-path=/community

# ThymeleafProperties
spring.thymeleaf.cache=false

# DataSourceProperties
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/community?characterEncoding=utf-8&useSSL=false&serverTimezone=Hongkong
spring.datasource.username=root
spring.datasource.password=lihonghe
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.hikari.maximum-pool-size=15
spring.datasource.hikari.minimum-idle=5
spring.datasource.hikari.idle-timeout=30000

# MybatisProperties
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.type-aliases-package=com.nowcoder.community.entity
mybatis.configuration.useGeneratedKeys=true
mybatis.configuration.mapUnderscoreToCamelCase=true


# MailProperties
spring.mail.host=smtp.sina.com
spring.mail.port=465
#自己的邮箱
spring.mail.username=nowcoder@sina.com
spring.mail.password=nowcoder123
spring.mail.protocol=smtps
spring.mail.properties.mail.smtp.ssl.enable=true
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如果发送不了邮件，需要在个人邮箱的网站设置启用授权码，验证手机，并修改properties文件中关于Email的配置

# MailProperties
spring.mail.host=smtp.sina.com
#spring.mail.port=465
spring.mail.username=nowcoder@sina.com
spring.mail.password=3398c6c71399f9fe
#spring.mail.protocol=smtps
#spring.mail.properties.mail.smtp.ssl.enable=true
spring.mail.properties.mail.smtl.auth=true
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在community文件下创建util工具文件包，并在util包中创建MailClient类使用@Component注解，并创建发送邮件的方法。

@Component
public class MailClient {

    private static final Logger logger = LoggerFactory.getLogger(MailClient.class);

    @Autowired
    private JavaMailSender mailSender;
    
    //从配置文件中获取值
    @Value("${spring.mail.username}")
    private String from;

    public void sendMail(String to, String subject, String content) {
        try {
            MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            mailSender.send(helper.getMimeMessage());
        } catch (MessagingException e) {
            logger.error("发送邮件失败:" + e.getMessage());
        }
    }

}
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4.2注册功能

在Controller层下创建LoginController类，实现登录界面跳转到注册页面，使用@Controller注解。

@Controller
public class LoginController implements CommunityConstant {

    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }

    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        return "/site/login";
    }
}
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使用模板引擎thymeleaf修改注册页面regist.html。

	
	
	
	
	
	
	


	

		
		

			

				
				
			
		

		
		

			

				
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在Maven Repository搜索commons lang配置文件并加入到poml文件中。在properties文件中加入community的路径。

# community
community.path.domain=http://localhost:8080
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在util中添加CommunityUtil工具类，方便生成密码。

public class CommunityUtil {

    // 生成随机字符串
    public static String generateUUID() {
        return UUID.randomUUID().toString().replaceAll("-", "");
    }

    // MD5加密
    // hello -> abc123def456
    // hello + 3e4a8 -> abc123def456abc
    public static String md5(String key) {
        if (StringUtils.isBlank(key)) {
            return null;
        }
        return DigestUtils.md5DigestAsHex(key.getBytes());
    }

}
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在Service中更新UserService类，用于注册用户业务，并更新激活页面activation.html。

@Service
public class UserService implements CommunityConstant {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private MailClient mailClient;

    @Autowired
    private TemplateEngine templateEngine;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private LoginTicketMapper loginTicketMapper;

    public User findUserById(int id) {
        return userMapper.selectById(id);
    }

    public Map register(User user) {
        Map map = new HashMap<>();

        // 空值处理
        if (user == null) {
            throw new IllegalArgumentException("参数不能为空!");
        }
        if (StringUtils.isBlank(user.getUsername())) {
            map.put("usernameMsg", "账号不能为空!");
            return map;
        }
        if (StringUtils.isBlank(user.getPassword())) {
            map.put("passwordMsg", "密码不能为空!");
            return map;
        }
        if (StringUtils.isBlank(user.getEmail())) {
            map.put("emailMsg", "邮箱不能为空!");
            return map;
        }

        // 验证账号
        User u = userMapper.selectByName(user.getUsername());
        if (u != null) {
            map.put("usernameMsg", "该账号已存在!");
            return map;
        }

        // 验证邮箱
        u = userMapper.selectByEmail(user.getEmail());
        if (u != null) {
            map.put("emailMsg", "该邮箱已被注册!");
            return map;
        }

        // 注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0, 5));
        user.setPassword(CommunityUtil.md5(user.getPassword() + user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID());
        user.setHeaderUrl(String.format("http://images.nowcoder.com/head/%dt.png", new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);

        // 激活邮件
        Context context = new Context();
        context.setVariable("email", user.getEmail());
        // http://localhost:8080/community/activation/101/code
        String url = domain + contextPath + "/activation/" + user.getId() + "/" + user.getActivationCode();
        context.setVariable("url", url);
        String content = templateEngine.process("/mail/activation", context);
        mailClient.sendMail(user.getEmail(), "激活账号", content);

        return map;
    }

    public int activation(int userId, String code) {
        User user = userMapper.selectById(userId);
        if (user.getStatus() == 1) {
            return ACTIVATION_REPEAT;
        } else if (user.getActivationCode().equals(code)) {
            userMapper.updateStatus(userId, 1);
            return ACTIVATION_SUCCESS;
        } else {
            return ACTIVATION_FAILURE;
        }
    }

    public Map login(String username, String password, int expiredSeconds) {
        Map map = new HashMap<>();

        // 空值处理
        if (StringUtils.isBlank(username)) {
            map.put("usernameMsg", "账号不能为空!");
            return map;
        }
        if (StringUtils.isBlank(password)) {
            map.put("passwordMsg", "密码不能为空!");
            return map;
        }

        // 验证账号
        User user = userMapper.selectByName(username);
        if (user == null) {
            map.put("usernameMsg", "该账号不存在!");
            return map;
        }

        // 验证状态
        if (user.getStatus() == 0) {
            map.put("usernameMsg", "该账号未激活!");
            return map;
        }

        // 验证密码
        password = CommunityUtil.md5(password + user.getSalt());
        if (!user.getPassword().equals(password)) {
            map.put("passwordMsg", "密码不正确!");
            return map;
        }

        // 生成登录凭证
        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis() + expiredSeconds * 1000));
        loginTicketMapper.insertLoginTicket(loginTicket);

        map.put("ticket", loginTicket.getTicket());
        return map;
    }


}





    
    
    


	

		

			xxx@xxx.com, 您好!
		
		

			您正在注册牛客网, 这是一封激活邮件, 请点击 
			此链接,
			激活您的牛客账号!
		
	


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注册之后需要更新LoginController，处理注册完成的请求。

@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }

    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        return "/site/login";
    }

    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map map = userService.register(user);
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功,我们已经向您的邮箱发送了一封激活邮件,请尽快激活!");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }

    
}
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更新operate-result页面。

	
	
	
	
	
	


	

		
		

			

				
				
			
		

		
		

			

				

					
您的账号已经激活成功,可以正常使用了!
					

					

						系统会在 8 秒后自动跳转,
						您也可以点此 链接, 手动跳转!
					
				
			
		

		
		
	

	
	
	
	


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在utill中创建一个CommunityConstant接口，用于表示注册状态码。

public interface CommunityConstant {

    /**
     * 激活成功
     */
    int ACTIVATION_SUCCESS = 0;

    /**
     * 重复激活
     */
    int ACTIVATION_REPEAT = 1;

    /**
     * 激活失败
     */
    int ACTIVATION_FAILURE = 2;

    /**
     * 默认状态的登录凭证的超时时间
     */
    int DEFAULT_EXPIRED_SECONDS = 3600 * 12;

    /**
     * 记住状态的登录凭证超时时间
     */
    int REMEMBER_EXPIRED_SECONDS = 3600 * 24 * 100;

}
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更新LoginController的功能，并更改Index.html文件相对应位置的模板参数。

@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }

    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        return "/site/login";
    }

    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map map = userService.register(user);
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功,我们已经向您的邮箱发送了一封激活邮件,请尽快激活!");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }

    // http://localhost:8080/community/activation/101/code
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功,您的账号已经可以正常使用了!");
            model.addAttribute("target", "/login");
        } else if (result == ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效操作,该账号已经激活过了!");
            model.addAttribute("target", "/index");
        } else {
            model.addAttribute("msg", "激活失败,您提供的激活码不正确!");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }


}
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4.3会话管理

使用Cookie保存一些信息，可以使用浏览器插件查看Cookie(F12控制台)

有关Cookie的一个小示例：

// cookie示例

    @RequestMapping(path = "/cookie/set", method = RequestMethod.GET)
    @ResponseBody
    public String setCookie(HttpServletResponse response) {
        // 创建cookie
        Cookie cookie = new Cookie("code", CommunityUtil.generateUUID());
        // 设置cookie生效的范围
        cookie.setPath("/community/alpha");
        // 设置cookie的生存时间
        cookie.setMaxAge(60 * 10);
        // 发送cookie
        response.addCookie(cookie);

        return "set cookie";
    }

    @RequestMapping(path = "/cookie/get", method = RequestMethod.GET)
    @ResponseBody
    public String getCookie(@CookieValue("code") String code) {
        System.out.println(code);
        return "get cookie";
    }

    // session示例

    @RequestMapping(path = "/session/set", method = RequestMethod.GET)
    @ResponseBody
    public String setSession(HttpSession session) {
        session.setAttribute("id", 1);
        session.setAttribute("name", "Test");
        return "set session";
    }

    @RequestMapping(path = "/session/get", method = RequestMethod.GET)
    @ResponseBody
    public String getSession(HttpSession session) {
        System.out.println(session.getAttribute("id"));
        System.out.println(session.getAttribute("name"));
        return "get session";
    }
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cookie和session的区别

后期可以考虑将Session数据传输到redis数据库中，用于保存一些登陆凭证

4.4生成验证码

验证码使用Kaptcha jar包用于随机生成字符和图片。在Maven Repository搜索Kaptcha配置文件，在resources文件包内的pom.xml文件中导入相关的配置文件依赖。在community目录下创建config文件包并创建KaptchaConfig配置类，使用@Configuration注解。

@Configuration
public class KaptchaConfig {

    @Bean
    public Producer kaptchaProducer() {
        Properties properties = new Properties();
        properties.setProperty("kaptcha.image.width", "100");
        properties.setProperty("kaptcha.image.height", "40");
        properties.setProperty("kaptcha.textproducer.font.size", "32");
        properties.setProperty("kaptcha.textproducer.font.color", "0,0,0");
        properties.setProperty("kaptcha.textproducer.char.string", "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYAZ");
        properties.setProperty("kaptcha.textproducer.char.length", "4");
        properties.setProperty("kaptcha.noise.impl", "com.google.code.kaptcha.impl.NoNoise");

        DefaultKaptcha kaptcha = new DefaultKaptcha();
        Config config = new Config(properties);
        kaptcha.setConfig(config);
        return kaptcha;
    }

}
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在LoginController文件中完善验证码功能，并完善登陆页面.html文件中验证码的模板，并实现刷新验证码的功能。

 @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response, HttpSession session) {
        // 生成验证码
        String text = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(text);

        // 将验证码存入session
        session.setAttribute("kaptcha", text);

        // 将突图片输出给浏览器
        response.setContentType("image/png");
        try {
            OutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            logger.error("响应验证码失败:" + e.getMessage());
        }
    }

    @RequestMapping(path = "/login", method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, HttpSession session, HttpServletResponse response) {
        // 检查验证码
        String kaptcha = (String) session.getAttribute("kaptcha");
        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确!");
            return "/site/login";
        }
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刷新验证码方法：

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4.5登录、退出功能

密码使用MD5加密

数据库中有关于登录凭证的ticket，使用这个ticket作为登陆凭证。涉及到数据库的操作，就要处理LoginTicketMapper。

LoginTicketMapper(这里是mapper的另外一种写法，不用再resource里面创建mapper文件):

@Mapper
public interface LoginTicketMapper {

    @Insert({
            "insert into login_ticket(user_id,ticket,status,expired) ",
            "values(#{userId},#{ticket},#{status},#{expired})"
    })
    @Options(useGeneratedKeys = true, keyProperty = "id")
    int insertLoginTicket(LoginTicket loginTicket);

    @Select({
            "select id,user_id,ticket,status,expired ",
            "from login_ticket where ticket=#{ticket}"
    })
    LoginTicket selectByTicket(String ticket);

    @Update({
            ""
    })
    int updateStatus(String ticket, int status);

}
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在UserService中增加登陆的方法，并在login.html中增加相应的修改：

public Map login(String username, String password, int expiredSeconds) {
        Map map = new HashMap<>();

        // 空值处理
        if (StringUtils.isBlank(username)) {
            map.put("usernameMsg", "账号不能为空!");
            return map;
        }
        if (StringUtils.isBlank(password)) {
            map.put("passwordMsg", "密码不能为空!");
            return map;
        }

        // 验证账号
        User user = userMapper.selectByName(username);
        if (user == null) {
            map.put("usernameMsg", "该账号不存在!");
            return map;
        }

        // 验证状态
        if (user.getStatus() == 0) {
            map.put("usernameMsg", "该账号未激活!");
            return map;
        }

        // 验证密码
        password = CommunityUtil.md5(password + user.getSalt());
        if (!user.getPassword().equals(password)) {
            map.put("passwordMsg", "密码不正确!");
            return map;
        }

        // 生成登录凭证
        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis() + expiredSeconds * 1000));
        loginTicketMapper.insertLoginTicket(loginTicket);

        map.put("ticket", loginTicket.getTicket());
        return map;
    }
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增加Controller层中的登录方法：

@RequestMapping(path = "/login", method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, HttpSession session, HttpServletResponse response) {
        // 检查验证码
        String kaptcha = (String) session.getAttribute("kaptcha");
        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确!");
            return "/site/login";
        }

        // 检查账号,密码
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map map = userService.login(username, password, expiredSeconds);
        if (map.containsKey("ticket")) {
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    @RequestMapping(path = "/logout", method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket) {
        userService.logout(ticket);
        return "redirect:/login";
    }
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4.6显示登陆信息

使用拦截器实现

在controller层下创建Interceptor文件包，

拦截器的方法

 // 在Controller之前执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        logger.debug("preHandle: " + handler.toString());
        return true;
    }

    // 在Controller之后执行
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        logger.debug("postHandle: " + handler.toString());
    }

    // 在TemplateEngine之后执行
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        logger.debug("afterCompletion: " + handler.toString());
    }
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在cpnfig文件下创建配置类WebMvcConfig，配置拦截器。

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    //测试拦截器方法
    @Autowired
    private AlphaInterceptor alphaInterceptor;

    @Autowired
    private LoginTicketInterceptor loginTicketInterceptor;

    @Autowired
    private LoginRequiredInterceptor loginRequiredInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(alphaInterceptor)
                .excludePathPatterns("/**/*.css", "/**/*.js", "/**/*.png", "/**/*.jpg", "/**/*.jpeg")
                .addPathPatterns("/register", "/login");

        registry.addInterceptor(loginTicketInterceptor)
                .excludePathPatterns("/**/*.css", "/**/*.js", "/**/*.png", "/**/*.jpg", "/**/*.jpeg");

    }

}
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在请求开始之前查询登录用户：

在Interceptor文件下创建LoginTicketInterceptor，实现拦截器的方法。

@Component
public class LoginTicketInterceptor implements HandlerInterceptor {

    @Autowired
    private UserService userService;

    @Autowired
    private HostHolder hostHolder;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 从cookie中获取凭证
        String ticket = CookieUtil.getValue(request, "ticket");

        if (ticket != null) {
            // 查询凭证
            LoginTicket loginTicket = userService.findLoginTicket(ticket);
            // 检查凭证是否有效
            if (loginTicket != null && loginTicket.getStatus() == 0 && loginTicket.getExpired().after(new Date())) {
                // 根据凭证查询用户
                User user = userService.findUserById(loginTicket.getUserId());
                // 在本次请求中持有用户
                hostHolder.setUser(user);
            }
        }

        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        User user = hostHolder.getUser();
        if (user != null && modelAndView != null) {
            modelAndView.addObject("loginUser", user);
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        hostHolder.clear();
    }
}
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在Util文件中创建Cookie工具，以及HostHolder工具用于代替session对象。完成过后修改相应的html文件。

public class CookieUtil {

    public static String getValue(HttpServletRequest request, String name) {
        if (request == null || name == null) {
            throw new IllegalArgumentException("参数为空!");
        }

        Cookie[] cookies = request.getCookies();
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                if (cookie.getName().equals(name)) {
                    return cookie.getValue();
                }
            }
        }

        return null;
    }

}

/**
 * 持有用户信息,用于代替session对象.
 */
@Component
public class HostHolder {

    private ThreadLocal users = new ThreadLocal<>();

    public void setUser(User user) {
        users.set(user);
    }

    public User getUser() {
        return users.get();
    }

    public void clear() {
        users.remove();
    }

}
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4.7账号设置

用户自己上传头像，请求必须是POST请求，表单：enctype = “multipart/form-data”,SpringMVC通过MutipartFile上传文件。

创建Usercontroller

@Controller
@RequestMapping("/user")
public class UserController {

    private static final Logger logger = LoggerFactory.getLogger(UserController.class);

    @Value("${community.path.upload}")
    private String uploadPath;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private UserService userService;

    @Autowired
    private HostHolder hostHolder;

    @LoginRequired
    @RequestMapping(path = "/setting", method = RequestMethod.GET)
    public String getSettingPage() {
        return "/site/setting";
    }

    @LoginRequired
    @RequestMapping(path = "/upload", method = RequestMethod.POST)
    public String uploadHeader(MultipartFile headerImage, Model model) {
        if (headerImage == null) {
            model.addAttribute("error", "您还没有选择图片!");
            return "/site/setting";
        }

        String fileName = headerImage.getOriginalFilename();
        String suffix = fileName.substring(fileName.lastIndexOf("."));
        if (StringUtils.isBlank(suffix)) {
            model.addAttribute("error", "文件的格式不正确!");
            return "/site/setting";
        }

        // 生成随机文件名
        fileName = CommunityUtil.generateUUID() + suffix;
        // 确定文件存放的路径
        File dest = new File(uploadPath + "/" + fileName);
        try {
            // 存储文件
            headerImage.transferTo(dest);
        } catch (IOException e) {
            logger.error("上传文件失败: " + e.getMessage());
            throw new RuntimeException("上传文件失败,服务器发生异常!", e);
        }

        // 更新当前用户的头像的路径(web访问路径)
        // http://localhost:8080/community/user/header/xxx.png
        User user = hostHolder.getUser();
        String headerUrl = domain + contextPath + "/user/header/" + fileName;
        userService.updateHeader(user.getId(), headerUrl);

        return "redirect:/index";
    }

    @RequestMapping(path = "/header/{fileName}", method = RequestMethod.GET)
    public void getHeader(@PathVariable("fileName") String fileName, HttpServletResponse response) {
        // 服务器存放路径
        fileName = uploadPath + "/" + fileName;
        // 文件后缀
        String suffix = fileName.substring(fileName.lastIndexOf("."));
        // 响应图片
        response.setContentType("image/" + suffix);
        try (
                FileInputStream fis = new FileInputStream(fileName);
                OutputStream os = response.getOutputStream();
        ) {
            byte[] buffer = new byte[1024];
            int b = 0;
            while ((b = fis.read(buffer)) != -1) {
                os.write(buffer, 0, b);
            }
        } catch (IOException e) {
            logger.error("读取头像失败: " + e.getMessage());
        }
    }

}
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配置setting.html的静态资源路径

	
	
	
	
	
	
	


	

		
		

			

				
				
			
		

		
		

			

				
				
上传头像
				

					

						选择头像:
						

							

								
								选择一张图片
								

									该账号不存在!
								
							
						
					
					

						

						

							立即上传
						
					
				
				
				
修改密码
				
				
					

						原密码:
						

							
							

								密码长度不能小于8位!
							
							
						
					
					

						新密码:
						

							
							

								密码长度不能小于8位!
							
							
						
					
					

						确认密码:
						

							
							

								两次输入的密码不一致!
							
								
						
					
				
					

						

						

							立即保存
						
					
				
				
			
		

		
		
	

	
	
	
	
	
	


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修改配置文件中，上传文件的保存位置。

community.path.upload=d:/work/data/upload
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4.8检查登陆状态

防止未登录访问某些资源，可以使用拦截器和注解。

使用注解，在community创建annotation文件创建Login注解。

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface LoginRequired {



}
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给Usercontroller中的方法，加入@LoginRequire注解，并创建拦截器拦截带注解的方法。

创建一个新的拦截器LoginRequireInterceptor。

@Component
public class LoginRequiredInterceptor implements HandlerInterceptor {

    @Autowired
    private HostHolder hostHolder;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //保证拦截的是方法
        if (handler instanceof HandlerMethod) {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            Method method = handlerMethod.getMethod();
            LoginRequired loginRequired = method.getAnnotation(LoginRequired.class);
            if (loginRequired != null && hostHolder.getUser() == null) {
                response.sendRedirect(request.getContextPath() + "/login");
                return false;
            }
        }
        return true;
    }
}
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项目代码及相关资源：Ming-XMU (Yiming Zhang) · GitHub

麻烦点点小星星！！！！！！

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