SPRINGMVC Classic Series-13 using SPRINGMVC to process AJAX requests---"Linuszhu"

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This section mainly explains how Springmvc handles Ajax requests, first of all to explain the Jackson class Library, to help us in the Java convert objects to and from json,XML data. He was able to convert the objects returned by the controller directly into JSON data for client use and the client to transfer JSON data to the server for conversion , it is very convenient.

The detailed environment construction process is as follows:

1. Download the two Jackson jar Pack:

Jackson-core-asl-1.7.2jar, Jackson-mapper-asl-1.7.2jar

2. Add the following sections in the SPRINGMVC configuration file, for example:

< Mvc:annotation-driven /> <!-- support spring3.0 new MVC Annotations- - <!-- start the annotation function for Spring MVC , complete the mapping of the request and annotation POJO - <Bean class=" Org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter "> <property name="cacheseconds" value= c8> "0" /> < property name="messageconverters" > <list > <Bean class="Org.springframework.http.converter.json." Mappingjacksonhttpmessageconverter "></bean> </list > </Property> </bean >

3. The client code ajaxtest.jsp such as the following:

<%@page language="java" contentType="text/html; Charset=utf-8 " pageencoding = "UTF-8" %> <! DOCTYPE HTML  Public "-//w3c//dtd HTML 4.01 transitional//en" > < HTML > < Head > < title > Ajax </ title > < META http-equiv = "Content-type" CONTENT = "Text/html;charset=utf-8" > < Script > function createajaxobj () { var req; if (window. XMLHttpRequest) { req = New XMLHttpRequest (); } else { req = New ActiveXObject ("msxml2.xmlhttp"); //ie } return req; } function Sendajaxreq () { var req = Createajaxobj (); Req.open ("Get", "Myajax.do?method=test1&uname= Zhang San"); Req.setrequestheader ("Accept", "Application/json"); Req.onreadystatechange = function () { eval ("var result=" + req.responsetext); document.getElementById ("Div1"). InnerHTML = Result[0].uname + "===" + result[1].uname + "===" + result[2].uname; }; req.send (null); } </ Script > </ Head > < Body > < a href="javascript:void (0);" onclick = "Sendajaxreq ();" > Ajax Test </ a > < Div id="Div1"></div> </ Body > </ HTML >

4. Server-side code such as the following:

Package Com.spring.ajax; Import java.util.ArrayList; Import java.util.List; Import Org.springframework.stereotype.Controller; Import org.springframework.web.bind.annotation.RequestMapping; Import Org.springframework.web.bind.annotation.RequestMethod; Import Org.springframework.web.bind.annotation.ResponseBody; Import Com.spring.bean.User; @Controller @RequestMapping ("Myajax.do") public class Myajaxcontroller { @RequestMapping (params = "Method=test1") Public @ResponseBody List<user> test1 (String uname) throws Exception { String uname2 = new String (Uname.getbytes ("iso8859-1"), "GBK"); System.out.println (uname2); System.out.println ("Myajaxcontroller.test1 ()"); list<user> list = new arraylist<user> (); User U1 = new user (); U1.setid (111); U1.setuname (" test 1"); User U2 = new user (); U2.setid (222); U2.setuname (" test 2"); User U3 = new user (); U3.setid (333); U3.setuname (" Test 3"); List.add (U1); List.add (U2); List.add (U3); return list; } }

5. Project execution test.

Enter Address: http://localhost:8081/SpringMVC02/ajaxTest.jsp , the interface such as the following:

Click on the link to test, will invoke the background program, the results are returned to the page, such as the following:

SPRINGMVC Classic Series-13 using SPRINGMVC to process AJAX requests---"Linuszhu"