fastjson开发学习(一)---把对象封装成json。
发布时间:2020-12-16 19:26:49 所属栏目:百科 来源:网络整理
导读:首先需要下载fastjson的jar包,官方也提供了下载地址和源码。 fastjson: http://www.oschina.net/p/fastjson fastjson 是一个性能很好的 Java 语言实现的 JSON 解析器和生成器,来自阿里巴巴的工程师开发。 主要特点: 快速FAST (比其它任何基于Java的解析器
首先需要下载fastjson的jar包,官方也提供了下载地址和源码。 fastjson: http://www.oschina.net/p/fastjson
fastjson 是一个性能很好的 Java 语言实现的 JSON 解析器和生成器,来自阿里巴巴的工程师开发。 主要特点:
代码如下:
package com.fastjson.test; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.alibaba.fastjson.JSON; public class FirstServlet extends HttpServlet { /** * Constructor of the object. */ public FirstServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { this.doPost(request,response); // // response.setContentType("text/html"); // PrintWriter out = response.getWriter(); // out // .println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">"); // out.println("<HTML>"); // out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); // out.println(" <BODY>"); // out.print(" This is "); // out.print(this.getClass()); // out.println(",using the GET method"); // out.println(" </BODY>"); // out.println("</HTML>"); // out.flush(); // out.close(); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request,IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); Group group = new Group(); group.setId(0L); group.setName("admin"); User guestUser = new User(); guestUser.setId(2L); guestUser.setName("guest"); User rootUser = new User(); rootUser.setId(3L); rootUser.setName("root"); group.getUsers().add(guestUser); group.getUsers().add(rootUser); String jsonString = JSON.toJSONString(group); System.out.println("调用后台"); out.println(jsonString); out.flush(); out.close(); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>FirstServlet</servlet-name> <servlet-class>com.fastjson.test.FirstServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>FirstServlet</servlet-name> <url-pattern>/servlet/first</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> jsp页面上(整理也可以用Html页面)
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'json.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <script type="text/javascript" src="js/jquery-1.4.2.min.js"></script> <script type="text/javascript"> $(function(){ $('#mylink').click(function(){ alert("ok"); $.get("http://192.168.0.101:8080/Test/servlet/first",function(data){ alert(data); $('#result').text(data); return; }); }); }); </script> </head> <body> <a href="javascript:void(0)" id="mylink">链接</a> <input type="button" id="mybtn" value="提交"> <div id="result"> </div> </body> </html> (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |