SpringMVC的数据响应

1.直接返回字符串

在SpringMVC快速入门已演示：快速入门案例

2.通过ModelAndView对象返回

1.方式一

@RequestMapping(value = "/quick2")
    public ModelAndView save2(){ 
        ModelAndView modelAndView = new ModelAndView();
        //设置模型数据
        modelAndView.addObject("userName","小飞侠");
        //设置视图名称
        modelAndView.setViewName("success");
        return modelAndView;

    }

运行测试：

2.方式二

@RequestMapping(value = "/quick3")
    public ModelAndView save3(ModelAndView modelAndView){ 
        //设置模型数据
        modelAndView.addObject("userName","小马哥");
        //设置视图名称
        modelAndView.setViewName("success");
        return modelAndView;

    }

运行测试：

3.方式三

@RequestMapping(value = "/quick4")
    public String save4(Model model){ 
        //设置模型数据
      model.addAttribute("userName","马奎斯");
        return "success";

    }

运行测试：

4.方式四(不常用)

@RequestMapping(value = "/quick5")
    public String save5(HttpServletRequest hsr){ 
        //设置模型数据
       hsr.setAttribute("userName","罗西");
        return "success";

    }

运行测试：

1.直接返回字符串

1.方式一

//回写数据
    @RequestMapping(value = "/quick6")
    public void save6(HttpServletResponse response) throws IOException { 
       response.getWriter().write("Hello World!");

    }

运行测试：

1.方式二

@RequestMapping(value = "/quick7")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public String save7() throws IOException { 
        return "hello World!";

    }

运行测试：

1.方式三

先创建一个User实体类

@RequestMapping(value = "/quick8")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public String save8() throws IOException { 
        return "{\"username\":\"jack\",\"age\":20}";

    }

运行测试：

1.方式四

先导入依赖：

<dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.0</version>
    </dependency>

@RequestMapping(value = "/quick9")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public String save9() throws IOException { 
        User u=new User();
        u.setUsername("tom");
        u.setAge(45);
        //使用json转换工具将对象转换为json格式字符串再返回
        ObjectMapper objectMapper = new ObjectMapper();
        String json = objectMapper.writeValueAsString(u);
        return json;
    }

运行测试：

2.返回对象和集合

1. 配置处理器映射器

<!--  配置处理器映射器-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
            </list>
        </property>
    </bean>

@RequestMapping(value = "/quick10")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public User save10() throws IOException { 
        User u=new User();
        u.setUsername("world");
        u.setAge(18);

        return u;

    }

运行测试：

2.注解

mvc注解驱动：

<!-- mvc注解驱动-->
    <mvc:annotation-driven></mvc:annotation-driven>

1.pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>SpringMVC-Demo1</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.3</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.0</version>
    </dependency>
  </dependencies>
</project>

2.web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
 <!-- 配置SpringMVC前端控制器-->
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>DispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

3.spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:http="http://www.springframework.org/schema/c"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
   http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--Controller的组件扫描-->
    <context:component-scan base-package="com.study.controller"></context:component-scan>
    <!--配置内部资源视图解析器-->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
  <!--  配置处理器映射器-->
    <!--<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
            </list>
        </property>

    </bean>-->
   <!-- mvc注解驱动-->
    <mvc:annotation-driven></mvc:annotation-driven>


</beans>

4.success.jsp

<%--
  Created by IntelliJ IDEA.
  User: 86166
  Date: 2022/6/26
  Time: 9:42
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>Success.......${ userName}</h1>
</body>
</html>

5.User

package com.study.domain;

public class User { 
    private String username;
    private int age;

    public String getUsername() { 
        return username;
    }

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

    public int getAge() { 
        return age;
    }

    public void setAge(int age) { 
        this.age = age;
    }

    @Override
    public String toString() { 
        return "User{" +
                "username='" + username + '\'' +
                ", age=" + age +
                '}';
    }
}

6.UserController

package com.study.controller;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.study.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

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

    @RequestMapping(value = "/quick10")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public User save10() throws IOException { 
        User u=new User();
        u.setUsername("world");
        u.setAge(18);

        return u;

    }

    @RequestMapping(value = "/quick9")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public String save9() throws IOException { 
        User u=new User();
        u.setUsername("tom");
        u.setAge(45);
        //使用json转换工具将对象转换为json格式字符串再返回
        ObjectMapper objectMapper = new ObjectMapper();
        String json = objectMapper.writeValueAsString(u);
        return json;
    }


    @RequestMapping(value = "/quick8")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public String save8() throws IOException { 
        return "{\"username\":\"jack\",\"age\":20}";

    }

    @RequestMapping(value = "/quick7")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public String save7() throws IOException { 
        return "hello World!";

    }

   //回写数据
    @RequestMapping(value = "/quick6")
    public void save6(HttpServletResponse response) throws IOException { 
       response.getWriter().write("Hello World!");

    }


    //不常用
    @RequestMapping(value = "/quick5")
    public String save5(HttpServletRequest hsr){ 
        //设置模型数据
       hsr.setAttribute("userName","罗西");
        return "success";

    }

    @RequestMapping(value = "/quick4")
    public String save4(Model model){ 
        //设置模型数据
      model.addAttribute("userName","马奎斯");
        return "success";

    }

    @RequestMapping(value = "/quick3")
    public ModelAndView save3(ModelAndView modelAndView){ 
        //设置模型数据
        modelAndView.addObject("userName","小马哥");
        //设置视图名称
        modelAndView.setViewName("success");
        return modelAndView;

    }

    @RequestMapping(value = "/quick2")
    public ModelAndView save2(){ 
        ModelAndView modelAndView = new ModelAndView();
        //设置模型数据
        modelAndView.addObject("userName","小飞侠");
        //设置视图名称
        modelAndView.setViewName("success");
        return modelAndView;

    }

    @RequestMapping(value = "/quick",method = RequestMethod.GET,params = { "userName"})
    public String save(){ 
        System.out.println("UserController....");
        /*return "success.jsp";*/
        /*return "/jsp/success.jsp";*/
        return "success";
    }
}

本文为互联网自动采集或经作者授权后发布，本文观点不代表立场，若侵权下架请联系我们删帖处理！文章出自：https://blog.csdn.net/qq_43514330/article/details/125496920

1.直接返回字符串

2.通过ModelAndView对象返回

1.方式一

2.方式二

3.方式三

4.方式四(不常用)

1.直接返回字符串

1.方式一

1.方式二

1.方式三

1.方式四

2.返回对象和集合

1. 配置处理器映射器

2.注解

1.pom.xml

2.web.xml

3.spring-mvc.xml

4.success.jsp

5.User

6.UserController

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