springMVC框架下返回json格式的对象，list，map
json
适用于现代 C++ 的 JSON。
项目地址：https://gitcode.com/gh_mirrors/js/json
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原文地址：http://liuzidong.iteye.com/blog/1069343
注意这个例子要使用jquery，但是jquery文件属于静态的资源文件，所以要在springMVC中设置静态资源访问
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>SpringMVCFile</display-name>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.js</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.css</url-pattern>
</servlet-mapping>
<!-- 配置前台分发器 -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 扫描使用springmvc配置文件 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>springMVC的配置文件
<?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:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 扫描包裹，我们完全使用注释定义 Bean 并完成 Bean 之间装配： -->
<context:component-scan base-package="com.fileUpDown" />
<!-- 解决了@Controller注解的使用前提配置。 -->
<mvc:annotation-driven />
<!-- 配置对静态资源的处理 -->
<!-- mapping是映射路径，location是本地属性就是webcontent下的目录，web-inf可能访问不到 -->
<mvc:resources mapping="/file/**" location="/fileHome/" />
<!-- 定义view视图解析器 -->
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/" />
<property name="suffix" value=".jsp" />
</bean>
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
</list>
</property>
</bean>
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
<!-- 设置文件上传的一些属性 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
p:defaultEncoding="UTF-8" />
</beans>前台的界面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!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=UTF-8">
<%-- <script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery/jquery-1.4.4.min.js"></script> --%>
<script type="text/javascript" src="${pageContext.request.contextPath}/jquery-1.11.0.min.js"></script>
<title>Spring MVC - jQuery 整合教程</title>
</head>
<body>
<h3>Spring MVC - jQuery 整合教程</h3>
<h4>AJAX version</h4>
<p>Demo 1 计算并返回值</p>
<div style="border: 1px solid #ccc; width: 250px;">
Add Two Numbers: <br/>
<input id="inputNumber1" type="text" size="5"> +
<input id="inputNumber2" type="text" size="9">
<input type="submit" id="demo1" value="Add" /> <br/>
Sum: <br>
<span id="sum">(Result will be shown here)</span>
</div>
<hr><br>
<p>Demo 2 获取一个对象</p>
<div style="border: 1px solid #ccc; width: 250px;">
<select id="userId">
<c:forEach var="index" begin="1" end="5" step="1">
<option value="${index}">${index}</option>
</c:forEach>
</select>
<input type="submit" id="demo2" value="Get" /> <br/>
<span id="info">(Result will be shown here)</span>
</div>
<hr><br>
<p>Demo 3 返回List集合对象</p>
<div style="border: 1px solid #ccc; width: 250px;">
<input type="submit" id="demo3" value="Get List User" /> <br/>
<span id="listInfo">(Result will be shown here)</span>
</div>
<hr><br>
<p>Demo 4 返回Map集合对象</p>
<div style="border: 1px solid #ccc; width: 250px;">
<input type="submit" id="demo4" value="Get Map User" /> <br/>
<span id="mapInfo">(Result will be shown here)</span>
</div>
<hr><br>
<a href="${pageContext.request.contextPath}/index.jsp">返回</a>
<hr><br>
<script type="text/javascript">
$(function() {
$("#demo1").click(function(){
//当demo1发生点击事件后，对/main/ajax/add.do发送请求，把传递的数据以json的形式传递，
//请求完成后使用function(data)函数，把结果显示到页面上来
$.post("${pageContext.request.contextPath}/main/ajax/add.do",
{inputNumber1: $("#inputNumber1").val(),
inputNumber2: $("#inputNumber2").val()
},
function(data){
$("#sum").replaceWith('<span id="sum">'+ data + '</span>');
});
});
$("#demo2").click(function(){
var userId = $("#userId").val();
$.post("${pageContext.request.contextPath}/main/ajax/getUser/"+userId+".do",
null,
function(data){
var info = "姓名: " + data.name+",年龄: " + data.age + ",地址: " + data.address + ",性别: " + (data.sex == 1 ? "男" : "女")+",密码: " + data.password;
$("#info").html(info);
});
});
$("#demo3").click(function(){
$.post("${pageContext.request.contextPath}/main/ajax/userList.do",
null,
function(data){
var info = '';
$.each(data,function(index,entity) {
info += "姓名: " + entity.name+",年龄: " + entity.age + ",地址: " + entity.address + ",性别: " + (entity.sex == 1 ? "男" : "女")+",密码: " + entity.password+"<br>";
});
$("#listInfo").html(info);
});
});
$("#demo4").click(function(){
$.post("${pageContext.request.contextPath}/main/ajax/userMap.do",
null,
function(map){
var info = '';
$.each(map,function(key,values) {
info += "key="+key+"<br>";
$(values).each(function(){
info += "姓名: " + this.name+",年龄: " + this.age + ",地址: " + this.address + ",性别: " + (this.sex == 1 ? "男" : "女")+",密码: " + this.password+"<br>";
});
});
$("#mapInfo").html(info);
});
});
});
</script>
</body>
</html>
com.fileUpDown包下的action jqueryJsonAction.java
package com.fileUpDown;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.springMVC.javaBean.User;
@Controller
@RequestMapping("/main/ajax")
public class jqueryJsonAction {
/**
* 根据映射跳转到指定的页面
*/
@RequestMapping(value = "/add", method = RequestMethod.GET)
public String getAjaxAddPage() {
// 跳转到ajax-add-page
return "ajax-add-page";
}
/**
* 提交表单并进行运算.
*/
@RequestMapping(value = "/add", method = RequestMethod.POST)
public @ResponseBody Integer add(@RequestParam(value = "inputNumber1", required = true) Integer inputNumber1,
@RequestParam(value = "inputNumber2", required = true) Integer inputNumber2) {
// 实现运算
Integer sum = inputNumber1 + inputNumber2;
System.out.println("sum: " + sum);
// @ResponseBody 会自动的将返回值转换成JSON格式
// 但是你必须添加jackson的jar包!!!
return sum;
}
@RequestMapping(value = "/getUser/{userId}", method = RequestMethod.POST)
/**
* @ResponseBody注解用于将Controller的方法返回的对象，通过适当的HttpMessageConverter转换为指定格式后，
* 写入到Response对象的body数据区 使用的时候Controller返回的不是界面的时候，是json或者xml
*/
/**
* 当使用@RequestMapping URI template 样式映射时， 即 someUrl/{paramId},
* 这时的paramId可通过 @Pathvariable注解绑定它传过来的值到方法的参数上。
*/
public @ResponseBody User getUser(@PathVariable("userId") String userId) {
System.out.println("根据ID获取用户对象: " + userId);
Map<String, User> users = new HashMap<String, User>();
users.put("1", new User("123456", "李逵", "123", "成都市", "1", 23));
users.put("2", new User("565676", "张三", "123", "北京市", "2", 53));
users.put("3", new User("325566", "李四", "123", "河南省", "2", 93));
users.put("4", new User("989654", "刘邦", "123", "蒙古包", "1", 13));
users.put("5", new User("234444", "王熙凤", "123", "成都市", "1", 43));
return users.get(userId);
}
@RequestMapping(value = "/userList", method = RequestMethod.POST)
public @ResponseBody List<User> getUsers() {
List<User> users = new ArrayList<User>();
users.add(new User("123456", "李逵", "123", "成都市", "1", 23));
users.add(new User("123457", "李四", "124", "北京市", "2", 53));
users.add(new User("123458", "李三", "125", "河南市", "0", 73));
users.add(new User("123459", "李五", "126", "大路市", "3", 93));
return users;
}
@RequestMapping(value="/userMap",method = RequestMethod.POST)
public @ResponseBody Map<String,User> getMap(){
Map<String,User> map = new HashMap<String,User>();
for(int i=0;i<4;i++){
map.put(""+i, new User("123456", "李逵", "123", "成都市", "1", i+23));
}
return map;
}
}
javaBean对象
package com.springMVC.javaBean;
public class User {
private String num;
private String name;
private String password;
private String address;
private String sex;
private int age;
public User(String num, String name, String password, String address, String sex, int age) {
super();
this.num = num;
this.name = name;
this.password = password;
this.address = address;
this.sex = sex;
this.age = age;
}
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
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适用于现代 C++ 的 JSON。
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