1. First download Json so rely on the package, json-lib the latest version of Json-lib-2.3-jdk15.jar, its official website is: http://json-lib.sourceforge.net/can directly download, Careful you will find that its web page has hints that it also needs other packages:
Json-lib requires (at least) the following dependencies in your classpath:
Jakarta Commons-lang 2.4
Jakarta commons-beanutils 1.7.0
Jakarta commons-collections 3.2
Jakarta commons-logging 1.1.1
Ezmorph 1.0.6
respectively:
http://commons.apache.org/lang/
http://commons.apache.org/beanutils/
http://commons.apache.org/collections/
http://commons.apache.org/logging/
http://ezmorph.sourceforge.net/
2. First foresight a small web project
User class:
PackageCom.json; Public classUser {String username; String password; PublicString GetUserName () {returnusername; } Public voidSetusername (String username) { This. Username =username; } PublicString GetPassword () {returnpassword; } Public voidSetPassword (String password) { This. Password =password; } }
Servlet:
PackageCom.json;Importjava.io.IOException;ImportJava.io.PrintWriter;Importjava.util.ArrayList;Importjava.util.List;Importjavax.servlet.ServletException;ImportJavax.servlet.http.HttpServlet;Importjavax.servlet.http.HttpServletRequest;ImportJavax.servlet.http.HttpServletResponse;ImportNet.sf.json.JSONArray; Public classTestjsonextendsHttpServlet { Public voiddoget (httpservletrequest request, httpservletresponse response)throwsservletexception, IOException {doPost (request,response); } Public voidDoPost (httpservletrequest request, httpservletresponse response)throwsservletexception, IOException {response.setcontenttype ("Text/html"); String Str= =request.getparameter ("name");//get the Ajax pass over the paramaterPrintWriter out=Response.getwriter (); List List=NewArrayList ();//Pass ListMap m=NewHashMap ();//Pass MapUser U1=NewUser (); U1.setusername ("Zah"); U1.setpassword ("123"); User U2=NewUser (); U2.setusername ("ZTF"); U2.setpassword ("456"); List.add (U1); //Add User ObjectList.add (U2);//Add User ObjectM.put ("U1", U1); M.put ("U2", U2); Jsonarray JsonArray2=jsonarray.fromobject (list); //Converts a Java array into a JSON objectJsonobject jo=Jsonobject.fromobject (m); //Convert Map ObjectOut.print (jsonArray2);//return to Ajax requestsOut.print (Jo);//return to Ajax requests }}
Ajax implementations:
<Scripttype= "Text/javascript"src= "Js/jquery.js"></Script><Scripttype= "Text/javascript"> functionTest () {$.ajax ({type:"POST", //Request MethodURL:"Testjson", //Request PathCache:false, Data:"Name=zah", //Pass the referenceDataType:'JSON', //return value typeSuccess:function(JSON) {alert (json[0].username+" "json[0].password); //Popup Returns the list object. } }); }</Script>
<Body> <inputtype= "button"name= "B"value= "Test"onclick=test ()></Body>
Output: Zah 123
To access the map, simply change the return function to the following:
Success:function (JSON) { alert (json.u1.username)}Ajax+json+java
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