2018.7.27 JSON and Java to convert each other

json.jsp

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "pageencoding=" UTF-8 "%><% @taglib prefix=" C "uri=" Http://java.sun.com/jsp/jstl/core "%> <! DOCTYPE html>

Jsonservlet

Package Servlet;import Java.io.ioexception;import Java.util.arraylist;import java.util.hashmap;import Java.util.list;import Java.util.map;import Javax.servlet.servletexception;import Javax.servlet.annotation.webservlet;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import Org.apache.commons.collections.map.hashedmap;import domain. Person;import net.sf.json.jsonarray;import net.sf.json.JSONObject; @WebServlet ("/jsonservlet") public class    Jsonservlet extends HttpServlet {private static final long serialversionuid = 1L; protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, Ioexcep    tion {doPost (request, response); } protected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, I        Oexception {String method = Request.getparameter ("method"); if (Method.equals ("Entityjson) {//Set encoding format otherwise garbled response.setcontenttype ("Text/html;charset=utf-8") will be displayed;            Person p = new person (1001, "Zhang San", "Male", "Guangxi"); 1.            Java entity to JSON object Jsonobject jsonobj = Jsonobject.fromobject (p);            Send data string Form Response.getwriter (). println (Jsonobj);                    System.out.println (Jsonobj); }else if (method.equals ("Jsonlist")) {//Set encoding format otherwise it will display garbled response.setcontenttype ("Text/html;charset=ut            F-8 ");            list<person> pList = new arraylist<person> ();            person P1 = new person (1001, "Zhang San", "Male", "Guangxi");            person P2 = new Person (1002, "John Doe", "female", "Guangdong");            Person P3 = new person (1003, "Harry", "Male", "Sichuan");            Plist.add (p1);            Plist.add (p2);            Plist.add (p3);            Jsonarray jsonobject = Jsonarray.fromobject (pList);            System.out.println ("Set length is" +jsonobject.size ()); Response.getwriter (). println (JsonobjeCT); }else if (method.equals ("Jsonmap")) {//Set encoding format otherwise it will display garbled response.setcontenttype ("Text/html;charset=utf            -8 ");            Map<string,person> MP = new hashmap<string,person> ();            Mp.put ("admin", new person (1001, "Zhang San", "Male", "Guangxi"));            Mp.put ("Visitor", new person (1002, "Zhang Si", "male", "Guangxi"));            Jsonarray Jsonmap = Jsonarray.fromobject (MP);        Send data Response.getwriter (). println (Jsonmap); }    }}

2018.7.27 JSON and Java to each other