从零开始—仿牛客网讨论社区项目（一）

主要技术架构：

SpringBoot Spring SpringMVC MyBatis Redis Kakfa Elasticsearch Spring Security Spring Actator

1.配置项目环境

在Spring Boot Initializr中或者Idea中初始化一个SpringBoot项目并导出

使用Idea打开导出的项目

2.MyBatis配置

各个层之间的关系如下

在Maven Repository搜索MySql Maven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，并在application.properties文件中配置相关的参数。

# 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
#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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在community文件下创建config entity文件包，在resources文件下创建mapper文件包

在entity文件下创建User类

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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在dao文件下创建UserMapper接口访问数据库

@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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使用Mapper注解，并在mapper文件下创建user-mapp.xml，使得方法与Sql语句相关联，Mybatis 的xml配置可以在官网找到相关的配置。

    
        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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可以使用@Test注解测试相关方法是否正常使用

3.开发社区首页功能：

3.1 开发社区首页显示前10个帖子

在Entity创建DiscussPost类，用于表示发送的相关数据，并在dao文件中创建DiscussPostMapper接口

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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在mapper文件下创建相关的xml文件用于数据库操作

    
        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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在service文件下创建DiscussPostService类，用于服务层使用（使用@Service注解）

@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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将静态资源（css image js等文件）放到static文件下，将模板文件（site index.html）放到templates文件下。

接下来开发视图层，新建一个HomeController在controller文件下使用@Controller注解

//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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更改Index.html文件，使用Thymeleaf对其中相对路径进行更改，并显示相关的帖子。

					

						
							
						
						

							

								备战春招，面试刷题跟他复习，一个月全搞定！
								置顶
								精华
							
							

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

									
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完整的HTML文件如下：

	
	
	
	
	
	

	
	

		
		

			

				
				
			
		

		
		

			

				

					
					

						

							最新
						
						

							最热
						
					
					我要发布
				
				
				

					

						

							

								
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