菜鸟学习Spring——SpringMVC注解版解析不同格式的JSON串
最后更新于：2022-04-01 09:34:22
## 一、概述
不同格式的JSON串传到后台来实现功能这个是我们经常要做的一件事，本篇博客就给大家介绍四种不同的JSON串传到后台后台如何用@RequestBody解析这些不同格式的JSON串的。
## 二、代码展示
需要引用的jar包
1.xml配置
Web.xml
~~~
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>springMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<url-pattern>*.spring</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
~~~
springMVC-servlet.xml
~~~
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
<context:component-scan base-package="com.gaowei.JSON" />
<mvc:annotation-driven />
</beans>
~~~
2.java代码
Userinfo.java
~~~
package com.gaowei.entity;
public class Userinfo {
private String username;
private String password;
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;
}
}
~~~
Test.java
~~~
package com.gaowei.JSON;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import com.gaowei.entity.Userinfo;
@Controller
public class Test {
@RequestMapping(value="getJSON1")
public void getJSON1(@RequestBody Userinfo userinfo){
System.out.println("------getJSON1---start----");
System.out.println(userinfo.getUsername());
System.out.println(userinfo.getPassword());
System.out.println("------getJSON1---end----");
}
@RequestMapping(value="getJSON2")
public void getJSON2(@RequestBody ArrayList<String> list){
System.out.println("------getJSON2---start----");
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i));
}
System.out.println("------getJSON2---end----");
}
@RequestMapping(value="getJSON3")
public void getJSON3(@RequestBody List<Map> list){
System.out.println("------getJSON3---start----");
for (int i = 0; i < list.size(); i++) {
Map map=list.get(i);
System.out.println(map.get("username")+" "+map.get("password"));
}
System.out.println("------getJSON3---end----");
}
@RequestMapping(value="getJSON4")
public void getJSON4(@RequestBody Map map){
System.out.println("------getJSON4---start----");
System.out.println(map.get("username"));
List<Map> workList=(List)map.get("work");
for (int i = 0; i < workList.size(); i++) {
Map eachAddressMap=workList.get(i);
System.out.println("address="+eachAddressMap.get("address"));
}
Map schoolMap=(Map)map.get("school");
System.out.println(schoolMap.get("name"));
System.out.println(schoolMap.get("address"));
System.out.println("------getJSON4---end----");
}
}
~~~
3.界面代码
Test.jsp
~~~
<%@ page language="java" import="java.util.*" pageEncoding="utf-8" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script src="jquery-1.3.2.js">
</script>
<script src="json2.js">
</script>
<script>
function userinfo(username, password){
this.username = username;
this.password = password;
}
function sendAjax1(){
var userinfoRef = new userinfo('中国', '中国人');
var jsonStringRef = JSON.stringify(userinfoRef);
$.ajax({
type: "POST",
data: jsonStringRef,
url: "getJSON1.spring?t=" + new Date().getTime(),
contentType: "application/json"
});
}
function sendAjax2(){
var myArray =new Array();
myArray[0]="中国1";
myArray[1]="中国2";
myArray[2]="中国3";
myArray[3]="中国4";
var jsonString=JSON.stringify(myArray);
$.ajax({
type: "POST",
data: jsonString,
url: "getJSON2.spring?t=" + new Date().getTime(),
contentType: "application/json"
});
}
function sendAjax3(){
var myArray=new Array();
myArray[0]= new userinfo('中国1', '中国人1');
myArray[1]= new userinfo('中国2', '中国人2');
myArray[2]= new userinfo('中国3', '中国人3');
myArray[3]= new userinfo('中国4', '中国人4');
var jsonString=JSON.stringify(myArray);
$.ajax({
type: "POST",
data: jsonString,
url: "getJSON3.spring?t=" + new Date().getTime(),
contentType: "application/json"
});
}
function sendAjax4(){
var jsonObject={
"username":"accp",
"work":[{
"address":"address1"
},{
"address":"address2"
}],
"school":{
"name":"tc",
"address":"pjy"
}
}
var jsonString=JSON.stringify(jsonObject);
$.ajax({
type: "POST",
data: jsonString,
url: "getJSON4.spring?t=" + new Date().getTime(),
contentType: "application/json"
});
}
</script>
</head>
<body>
<input type="button" onclick="sendAjax1()" value="sendAjax1"/>
<br/>
<input type="button" onclick="sendAjax2()" value="sendAjax2">
<br/>
<input type="button" onclick="sendAjax3()" value="sendAjax3">
<br/>
<input type="button" onclick="sendAjax4()" value="sendAjax4">
<br/>
</body>
</html>
~~~
4.效果图
## 三、总结。
这里要注意jar包的引用不要把Spring的所有jar包都引用了会引起jar包冲突而导致报HTTP415的错误。@RequestBody这个方法很强大可以把JSON串转化为实体类、ArryList、Map等对象。这样的方法让我们开发人员开发效率大大的提高了