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spring boot最新教程(四):返回json数据以及集成fastjson的使用

2018-03-10 00:29 1236 查看

一利用spring boot自带的包Jackson来解析json数据
我们在编写接口的时候，时常会有需求返回json数据，那么在spring boot应该怎么操作呢？主要是在class中加入注解@RestController。关于@RestController请参考我的博文[http://blog.csdn.net/wx5040257/article/details/79451449]
================pom.xml==================<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>com.wx</groupId>
<artifactId>springboot03</artifactId>
<version>0.0.1-SNAPSHOT</version>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>

<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.32</version>
</dependency>

</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>

<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>

</build>
</project>全局配置文件
==============application.properties====================server.port=8080
spring.mvc.view.prefix=/
spring.mvc.view.suffix=.jsp
server.servlet-path=*.php
#修改了jsp，servlet不用重新启动
server.jsp-servlet.init-parameters.development=true控制器JsonCotroller
==============JsonCotroller================package com.wx.controlers;

import java.util.ArrayList;
import java.util.List;

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

import com.wx.entitys.UserEntity;

@RestController
public class JsonController {
@RequestMapping("/getString")
public String hello(){
return "Hello";
}

@RequestMapping("/getEntity.php")
public UserEntity showEntity(){
UserEntity user=new UserEntity();
user.setUserId(100);
user.setUserName("麻子");
user.setPassWord("123");
user.setEmail("mazi@qq.com");
return user;
}

@RequestMapping("/getList.php")
public List<UserEntity> showList(){
List<UserEntity> userList=new ArrayList<UserEntity>();
UserEntity user=new UserEntity();
user.setUserId(100);
user.setUserName("麻子");
user.setPassWord("123");
user.setEmail("mazi@qq.com");
userList.add(user);
user=new UserEntity();
user.setUserId(101);
user.setUserName("小丽");
user.setPassWord("321");
user.setEmail("xiaoli@qq.com");
userList.add(user);
return userList;
}
}
启动程序，在地址栏输入 http://localhost:8080/getEntity.php，得到如下结果

输入http://localhost:8080/getList.php，得到

注意得到的直接是json对象，而不是json字符串
展示在页码上
==================ShowJsonResult.jsp============<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<c:set var="scheme" value="${pageContext.request.scheme}"></c:set>
<c:set var="serverName" value="${pageContext.request.serverName}"></c:set>
<c:set var="serverPort" value="${pageContext.request.serverPort}"></c:set>
<c:set var="contextPath" value="${pageContext.request.contextPath}"></c:set>
<c:set var="basePath" value="${scheme}://${serverName}:${serverPort}${contextPath}/"></c:set>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="${basePath}">
<title>展示一个用户数据</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(e){
$("#clickOne").click(function(e){
$.post("getEntity.php","",function(result){
//得到的结果直接是json对象，都不用再转换了
var innerStr="<h3>"+result.userId+","+result.userName
+","+result.email+"</h3>";
$("#showOne").html(innerStr);
});
});

$("#clickMany").click(function(e){
$.post("getList.php","",function(result){
var innerStr="";
for(var i=0;i<result.length;i++){
innerStr=innerStr+result[i].userId+","+result[i].userName+","
+result[i].email+"<br/>";
}
innerStr="<h3>"+innerStr+"</h3>";
$("#showMany").html(innerStr);
});
});
});
</script>
<body>

<h1>输出json里面的数据</h1>
<div><input type="button" id="clickOne" value="展示一个对象"/><br/>
<div id="showOne"></div>
</div>
<div><input type="button" id="clickMany" value="展示一个数组"/><br/>
<div id="showMany"></div>
</div>
</body>
</html>
页码结果如图所示：

二利用阿里巴巴的fastjson来解析json数据

导入依赖
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.32</version>
</dependency>编写控制器类
================FastJsonController.java===================package com.wx.controlers;

import java.util.ArrayList;
import java.util.List;

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

import com.alibaba.fastjson.JSONObject;
import com.wx.entitys.UserEntity;

@RestController
public class FastJsonController {

@RequestMapping("/getFastEntity.php")
public String showEntity(){
UserEntity user=new UserEntity();
user.setUserId(100);
user.setUserName("麻子");
user.setPassWord("123");
user.setEmail("mazi@qq.com");
return JSONObject.toJSONString(user);
}

@RequestMapping("/getFastList.php")
public String showList(){
List<UserEntity> userList=new ArrayList<UserEntity>();
UserEntity user=new UserEntity();
user.setUserId(100);
user.setUserName("麻子");
user.setPassWord("123");
user.setEmail("mazi@qq.com");
userList.add(user);
user=new UserEntity();
user.setUserId(101);
user.setUserName("小丽");
user.setPassWord("321");
user.setEmail("xiaoli@qq.com");
userList.add(user);
return JSONObject.toJSONString(userList);
}
}
注意看返回值，无法直接像jackson一样直接得到json对象，这里是返回的json字符串，需要在页面中转换！
页码代码
===================ShowFastJsonResult.jsp===============<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<c:set var="scheme" value="${pageContext.request.scheme}"></c:set>
<c:set var="serverName" value="${pageContext.request.serverName}"></c:set>
<c:set var="serverPort" value="${pageContext.request.serverPort}"></c:set>
<c:set var="contextPath" value="${pageContext.request.contextPath}"></c:set>
<c:set var="basePath" value="${scheme}://${serverName}:${serverPort}${contextPath}/"></c:set>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="${basePath}">
<title>展示一个用户数据</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(e){
$("#clickOne").click(function(e){
$.post("getFastEntity.php","",function(result){
//把json字符串转换成json对象
var jsonObj=$.parseJSON(result);
var innerStr="<h3>"+jsonObj.userId+","+jsonObj.userName
+","+jsonObj.email+"</h3>";
$("#showOne").html(innerStr);
});
});

$("#clickMany").click(function(e){
$.post("getFastList.php","",function(result){
//把json字符串转换成json对象
var jsonObj=$.parseJSON(result);
var innerStr="";
for(var i=0;i<jsonObj.length;i++){
innerStr=innerStr+jsonObj[i].userId+","+jsonObj[i].userName+","
+jsonObj[i].email+"<br/>";
}
innerStr="<h3>"+innerStr+"</h3>";
$("#showMany").html(innerStr);

});
});
});
</script>
<body>

<h1>输出json里面的数据</h1>
<div><input type="button" id="clickOne" value="展示一个对象"/><br/>
<div id="showOne"></div>
</div>
<div><input type="button" id="clickMany" value="展示一个数组"/><br/>
<div id="showMany"></div>
</div>
</body>
</html>
点击两个按钮得到的结果与前面一致!注意这里要调用
var jsonObj=$.parseJSON(result);

把json串转换成json对象！

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