How Ajax transmits JSON and XML data _ajax related

Ajax Transfer of XML data: as long as the data encapsulated into an XML format can be achieved transmission, the front desk JS with Responsexml to receive XML parameters, background reading with streams and dom4j to resolve

Front Page

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%> <% @taglib uri= "http://java.sun.com/jsp /jstl/core "prefix=" C "%> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >  

Background pages

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%> <% @taglib uri= "http://java.sun.com/jsp /jstl/core "prefix=" C "%> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >  

--------------------------------------------------------------------------------

The main points of the Ajax transfer of JSON data are transmitted using Apache or Alibaba's Jsonarray class
Front Code

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%> <% @taglib uri= "http://java.sun.com/jsp /jstl/core "prefix=" C "%> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >  

Jsonservlet1.java

Package cn.hncu.servlet;
Import java.io.IOException;
Import Java.io.PrintWriter;
Import java.util.ArrayList;

Import java.util.List;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;

Import Javax.servlet.http.HttpServletResponse;

Import Cn.hncu.domain.User; public class JsonServlet1 extends HttpServlet {public void doget (HttpServletRequest request, HttpServletResponse Respon
 SE) throws Servletexception, IOException {doPost (request, response); public void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {//Call back Service.dao.query (), to the database to read out the information//To simplify the understanding of knowledge points, the function of the backstage section directly simulates Response.setcontenttype ("text/html;charset=
  Utf-8 ");
  PrintWriter out = Response.getwriter ();
  list<user> users = new arraylist<user> ();
  Users.add (New User ("A001", "Jack", 20));
  Users.add (New User ("A002", "Rose", 22); Users.add (New User ("B001", "John", 20));
  Users.add (New User ("B002", "Dick", 30));
  String json= "";
  String in JSON format in Java: [{name: ' Jack ', age:25}, {...}}, {...}] for (User u:users) {if (Json.equals (")) {json=" {name:\ "" +u.getname () + "\" Id:\ "" +u.getid () + "\", Age: "+u.getage () +"} "
   ;
   }else{JSON = json + ", {name:\" "+u.getname () +" \ ", Id:\" "+u.getid () +" \ ", Age:" +u.getage () + "}";
  } json= "[+json+]";
 Out.print (JSON);

 }

}

Jsonservlet2.java

Package cn.hncu.servlet;
Import java.io.IOException;
Import Java.io.PrintWriter;
Import java.util.ArrayList;
Import Java.util.HashMap;
Import java.util.List;

Import Java.util.Map;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;

Import Javax.servlet.http.HttpServletResponse;

Import Cn.hncu.domain.User;
Import Net.sf.json.JSONArray;

Import Net.sf.json.JSONObject; public class JsonServlet2 extends HttpServlet {public void DoPost (HttpServletRequest request, HttpServletResponse Respo
  NSE) throws Servletexception, IOException {response.setcontenttype ("text/html;charset=utf-8");
  PrintWriter out = Response.getwriter ();
  list<user> users = new arraylist<user> ();
  Users.add (New User ("A001", "Jack", 20));
  Users.add (New User ("A002", "Rose", 22);
  Users.add (New User ("B001", "John", 20));
  Users.add (New User ("B002", "Dick", 30));
  String strjson=com.alibaba.fastjson.jsonarray.tojsonstring (users); SYstem.out.println (Strjson);
  Use the Fastjson tool (only a jar package) to help us convert the list to a JSON string map<string, object> Map = new hashmap<string, object> ();
  Map.put ("addr", "Hunan");
  Map.put ("height", "170");
  Map.put ("Marry", "no");
  Map.put ("User", New User ("A003", "Xiao Li", 25));

  String strmap=com.alibaba.fastjson.jsonarray.tojsonstring (map);
 Out.print (Strmap.tostring ());

 }

}

Jsonservlet3.java

Package cn.hncu.servlet;
Import java.io.IOException;
Import Java.io.PrintWriter;
Import java.util.ArrayList;
Import Java.util.HashMap;
Import java.util.List;

Import Java.util.Map;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;

Import Javax.servlet.http.HttpServletResponse;
Import Net.sf.json.JSONArray;
Import Net.sf.json.JSONObject;

Import Cn.hncu.domain.User; public class JsonServlet3 extends HttpServlet {public void DoPost (HttpServletRequest request, HttpServletResponse Respo
  NSE) throws Servletexception, IOException {response.setcontenttype ("text/html;charset=utf-8");
  PrintWriter out = Response.getwriter ();
  list<user> users = new arraylist<user> ();
  Users.add (New User ("A001", "Jack", 20));
  Users.add (New User ("A002", "Rose", 22);
  Users.add (New User ("B001", "John", 20));
  Users.add (New User ("B002", "Dick", 30)); Use the Fastjson tool (only one jar package) to help us convert the list to a JSON string Jsonarray json=jsonarray.fromObject (users);
  String strjson=json.tostring ();

  System.out.println (Strjson);
  map<string, object> map = new hashmap<string, object> ();
  Map.put ("addr", "Hunan");
  Map.put ("height", "170");
  Map.put ("Marry", "no");
  Map.put ("User", New User ("A003", "Xiao Li", 25));
  Jsonobject obj = jsonobject.fromobject (map);

  System.out.println (Obj.tostring ());
 Out.print (Obj.tostring ());


 }

}

The above is the entire content of this article, I hope to help you learn, but also hope that we support the cloud habitat community.