springMVC的返回值有ModelAndView,String,void,Object类型

项目目录树:

该项目是在前面项目的基础上修改的,这里的pom.xml文件需要加入使用到的包,应为@ResponseBody需要使用的包

<dependency>

        <groupId>com.fasterxml.jackson.core</groupId>

        <artifactId>jackson-core</artifactId>

        <version>2.7.3</version>

    </dependency>

    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->

    <dependency>

        <groupId>com.fasterxml.jackson.core</groupId>

        <artifactId>jackson-annotations</artifactId>

        <version>2.7.3</version>

    </dependency>

    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->

    <dependency>

        <groupId>com.fasterxml.jackson.core</groupId>

        <artifactId>jackson-databind</artifactId>

        <version>2.7.3</version>

    </dependency>

ReturnValueController.java控制器

package com.orange.controller;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.servlet.ModelAndView;

@Controller

@RequestMapping(value="/returnValue")

public class ReturnValueController {

    @RequestMapping("/returnModelAndView")  //返回ModelAndView

    public ModelAndView doModelAndView(String name, String password, ModelAndView mav){

        mav.addObject("name", name);

        mav.addObject("password", password);

        mav.setViewName("/showReturn.jsp");

        return mav;

    }

    @RequestMapping("/returnString") //返回String类型, 可以通过HttpServletRequest 来传递参数

    public String doString(String sname, String spassword, HttpServletRequest request){

        request.setAttribute("sname", sname);

        request.setAttribute("spassword", spassword);

        return "/showReturn.jsp";

    }

    @RequestMapping("/returnVoid") //无返回值,通过ServletAPI完成参数传递和跳转

    public void doVoid(String vname, String vpassword, HttpServletRequest request, HttpServletResponse response) throws Exception{

        request.setAttribute("vname", vname);

        request.setAttribute("vpassword", vpassword);

        request.getRequestDispatcher("/showReturn.jsp").forward(request, response);

    }

    @RequestMapping("/returnObjectValue") //返回Object对象需要开启消息转换器HttpMessageConverter,<mvc:annotation-driven/>

    @ResponseBody

    public Object doObjectValue(){

        return 12.34;

    }

    @RequestMapping("/returnObjectString") //返回String

    @ResponseBody

    public Object doObjectString(){

        return "Hello SpringMVC";

    }

    @RequestMapping("/returnObjectList") //返回List

    @ResponseBody

    public Object doObjectList(){

        List<String> list = new ArrayList<String>();

        list.add("String1");

        list.add("String2");

        list.add("String3");

        return list;

    }

    @RequestMapping("/returnObjectMap") //返回Map

    @ResponseBody

    public Object doObjectMap(){

        Map<String, String> map = new HashMap<String, String>();

        map.put("mk1", "kv1");

        map.put("mk2", "kv2");

        map.put("mk3", "kv3");

        return map;

    }

}

spring-mvc.xml需要添加驱动器注解

<?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:mvc="http://www.springframework.org/schema/mvc"

    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd

        http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!-- 开启驱动器注解 -->

    <mvc:annotation-driven />

    <!-- 静态资源设置,因为需要加入js/jquery-1.7.1.js静态资源 -->

    <mvc:resources location="/js/" mapping="/js/**"/>

    <!-- 扫描注解 -->

    <context:component-scan base-package="com.orange.controller" />    

</beans>

测试页面returnValue.jsp,用来调取Controller的配置

<%@ page language="java" contentType="text/html; charset=GBK"

    pageEncoding="GBK"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>

<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

<%

    String path = request.getContextPath();

    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GBK">

<base href="<%=basePath %>">

<script type="text/javascript" src="js/jquery-1.7.1.js"></script>

<script type="text/javascript">

    $(function(){

        //获取value值得ajax

        $("#value").on("click", function(){

            alert("123");

         $.ajax({

                type: "get",

                url: "returnValue/returnObjectValue",

                success: function(data){

                    alert("data: " + data);

                }

            });

        });

        //获取String值得ajax

        $("#string").on("click", function(){

            alert("123");

         $.ajax({

                type: "get",

                url: "returnValue/returnObjectString",

                success: function(data){

                    alert("data: " + data);

                }

            });

        });

        //获取List值得ajax

        $("#list").on("click", function(){

            alert("123");

         $.ajax({

                type: "get",

                url: "returnValue/returnObjectList",

                success: function(data){

                    for(var i=0; i<data.length; i++)

                    alert("data: " + data[i]);

                }

            });

        });

        //获取Map值得ajax

        $("#map").on("click", function(){

            alert("123");

         $.ajax({

                type: "get",

                url: "returnValue/returnObjectMap",

                success: function(data){

                    for(var key in data){

                        alert("key: " + key + " value: " + data[key]);

                    }

                }

            });

        });

    });

</script>

<title>ReturnValue</title>

</head>

<body>

返回ModelAndView

<form action="returnValue/returnModelAndView">

    name: <input type="text" name="name"><br/>

    password:<input type="text" name="name"><br/>

    <input type="submit" value="submit">

</form>

<hr>

返回String类型

<form action="returnValue/returnString">

    name: <input type="text" name="sname"><br/>

    password:<input type="text" name="spassword"><br/>

    <input type="submit" value="submit">

</form>

<hr>

无返回值

<form action="returnValue/returnVoid">

    name: <input type="text" name="vname"><br/>

    password:<input type="text" name="vname"><br/>

    <input type="submit" value="submit">

</form>

<hr>

返回Object对象,类型为数值型

<input id="value" type="button" value="AjaxgetValue">

<hr>

返回Object对象,类型为String

<input id="string" type="button" value="AjaxgetString">

<hr>

返回Object对象,类型为List

<input id="list" type="button" value="AjaxgetList">

<hr>

返回Object对象,类型为Map

<input id="map" type="button" value="AjaxgetMap">

</body>

</html>

跳转后的页面showReturn.jsp

<%@ page language="java" contentType="text/html; charset=GBK"

    pageEncoding="GBK"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>

<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

<%

    String path = request.getContextPath();

    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GBK">

<base href="<%=basePath %>">

<title>ShowReturn</title>

</head>

<body>

返回ModelAndView

<div>

    <h3><c:out value="${name }" /></h3>

    <h3><c:out value="${password }" /></h3>

</div>

<hr>

返回String类型

<div>

    <h3><c:out value="${sname }" /></h3>

    <h3><c:out value="${spassword }" /></h3>

</div>

<hr>

无返回值

<div>

    <h3><c:out value="${vname }" /></h3>

    <h3><c:out value="${vpassword }" /></h3>

</div>

</body>

</html>

测试结果

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