【SpringMVC】

SpringMVC技术与Servlet技术功能等同,均属于web层开发技术

优点：使用简单，开发快捷，灵活性强

依赖

 <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>6.0.5</version>
        </dependency>

bean加载控制

避免Spring错误加载到SpringMVC的bean

方式1：扫描全部，排除掉SpringMVC的bean（例如controller）

package org.example.config;/*
 * @Auther:huangzhiyang
 * @Date:2023/10/7
 * @Description:
 */
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
 
@Configuration
@ComponentScan(value = "org.example",
        excludeFilters = @ComponentScan.Filter(
                type = FilterType.ANNOTATION,
                classes = Controller.class
        )
)
public class SpringConfig {
}

方式2：精准扫描Spring的bean（例如service，dao）

package org.example.config;/*
 * @Auther:huangzhiyang
 * @Date:2023/10/7
 * @Description:
 */
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
 
@Configuration
@ComponentScan({"org.example.service","org.example.dao"})
public class SpringConfig {
}

方法3：不区分Spring与SpringMVC的环境

简化开发

package org.example.config;/*
 * @Auther:huangzhiyang
 * @Date:2023/10/7
 * @Description:
 */
 
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
 
public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
 
    @Override
    protected Class[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }
 
    @Override
    protected Class[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }
 
    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

package org.example.config;/*
 * @Auther:huangzhiyang
 * @Date:2023/10/7
 * @Description:
 */
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
 
@Configuration
@ComponentScan("org.example.controller")
public class SpringMvcConfig {
}

package org.example.config;/*
 * @Auther:huangzhiyang
 * @Date:2023/10/7
 * @Description:
 */
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
 
@Configuration
@ComponentScan(value = "org.example",
        excludeFilters = @ComponentScan.Filter(
                type = FilterType.ANNOTATION,
                classes = Controller.class
        )
)
public class SpringConfig {
}

请求与响应

请求注解

@RequestMapping

@RequestParam 

@RequestBody（详细看下面的json参数） 

@RequestBody与＠RequestParam区别

 区别：@RequestParam用于接收ur1地址传参，表单传参【application/x-www-form-urlencoded】，@RequestBody用于接收json数据【application/json】
 应用： 后期开发中，发送json格式数据为主，@RequestBody应用较广，如果发送非json格式数据，选用＠RequestParam接收请求参数

请求路径 

package org.example.controller;/*
 * @Auther:huangzhiyang
 * @Date:2023/10/7
 * @Description:
 */
 
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
@RequestMapping("/user")
public class UserController {
    @RequestMapping("/save")
    @ResponseBody
    public String save() {
        System.out.println("user save");
        return "{'module':'user save'}";
    }
 
    @RequestMapping("/delete")
    @ResponseBody
    public String delete() {
        System.out.println("user delete");
        return "{'module':'user delete'}";
    }
}

请求方式

Get请求

 @RequestMapping("/commonParam")
    @ResponseBody
    public String commonParam(String name) {
        System.out.println("user save");
        return "{'module':'user commonParam'}";
    }

Post请求

与get一致

普通参数

pojo参数

数组参数

集合参数

json参数

导入依赖

<dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.14.2</version>
        </dependency>

 改变SpringMvcConfig

package org.example.config;/*
 * @Auther:huangzhiyang
 * @Date:2023/10/7
 * @Description:
 */
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 
@Configuration
@ComponentScan("org.example.controller")
@EnableWebMvc
public class SpringMvcConfig {
}

接受json数据

 @RequestMapping("/test")
    @ResponseBody
    public String listParamForJson(@RequestBody List<String> likes){
        return "";
    }

日期类型参数传递

乱码处理

修改ServletContainersInitConfig

package org.example.config;/*
 * @Auther:huangzhiyang
 * @Date:2023/10/7
 * @Description:
 */
 
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
 
import java.util.logging.Filter;
 
public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
 
    @Override
    protected Class[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }
 
    @Override
    protected Class[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }
 
    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
    @Override
    protected void getServletFilters(){
        CharacterEncodingFilter filter=new CharacterEncodingFilter();
        filter.setEncoding("UTF-8");
        return new Filter[]{filter};
    }
}

响应方式

响应页面

@RequestMapping("/toJumpPage")
    public String toJumpPage() {
        System.out.println("跳转页面");
        return "index.jsp";
    }

响应数据

@RequestMapping("/toText")
    @ResponseBody
    public String delete() {
        System.out.println("返回纯文本数据");
        return "response text";
    }

@RequestMapping("/toJsonPOJO")
    @ResponseBody
    public User listParamForJson() {
        UserDao user=new UserDao() ;
        user.setAge(15);
        user.setName("15");
        return user;
    }