Page: jsonexample.jsp
<%@ page contenttype= "text/html; CHARSET=GBK "%>
<title>
JSON sample
</title>
<script type= "Text/javascript" src= "Zxml.src.js" ></script>
<script type= "Text/javascript" src= "Json.js" ></script>
<script type= "Text/javascript" >
var xmlHttp;
Creating objects
function Createxmlhttprequest () {
XmlHttp = Zxmlhttp.createrequest ();
}
function Dojson () {
Get Car Object
var car = Getcarobject ();
String a car object with JSON
var Carasjson = car.tojsonstring ();
Alert ("Auto object json to: \ n" + Carasjson);
var url = "jsonexample?timestamp=" + New Date (). GetTime ();
Creating objects
Createxmlhttprequest ();
Xmlhttp.open ("POST", url,true);
Xmlhttp.onreadystatechange = Handlestatechange;
Xmlhttp.setrequestheader ("Content-type", "application/x-www-form.urlencoded");
Xmlhttp.send (Carasjson);
}
callback method
function Handlestatechange () {
if (xmlhttp.readystate = = 4) {
if (Xmlhttp.status = = 200) {
Parseresults ();
}
}
}
Parse results
function Parseresults () {
var responsediv = document.getElementById ("Serverresponse");
if (Responsediv.haschildnodes ()) {
Responsediv.removechild (Responsediv.childnode[0]);
}
var responsetext = document.createTextNode (Xmlhttp.responsetext);
Responsediv.appendchild (ResponseText);
}
Get Car Object
function Getcarobject () {
Return to New car ("Dodge", "Coronet R/t", 1968, "Yellow");
}
Car constructor
function car (make,model,year,color) {
This.make = make;
This.model = model;
This.year = year;
This.color = color;
}
</script>
<body>
<br/><br/>
<form action= "#" >
<input type= "button" value= "Send json data"/>
</form>
Server response:
<div id= "Serverresponse" >
</div>
</body>
Server: Jsonexample.java
Package AJAXBOOK.CHAP4;
Import java.io.*;
Import java.net.*;
Import java.text.ParseException;
Import javax.servlet.*;
Import javax.servlet.http.*;
Import Org.json.JSONObject;
public class Jsonexample
Extends HttpServlet {
Handling Post Methods
protected void DoPost (HttpServletRequest request,
HttpServletResponse response) throws Servletexception,
IOException {
String JSON = readjsonstringfromrequestbody (request);
Using JSON to bind a word to an Ajax object
Jsonobject jsonobject = null;
try {
Jsonobject = new Jsonobject (JSON);
}
catch (ParseException PE) {
System.out.println ("parseexception:" + pe.tostring ());
}
Return output results
String responsetext = "You have a" + Jsonobject.getint ("year") + ""
+ jsonobject.getstring ("make") + "" + jsonobject.getstring ("model")
+ "" + "that's" + jsonobject.getstring ("color") + "in color."
Response.setcontenttype ("Text/xml");
Response.getwriter (). print (responsetext);
}
Get the parameters
Private String Readjsonstringfromrequestbody (HttpServletRequest request) {
StringBuffer json = new StringBuffer ();
String line = null;
try {
BufferedReader reader = Request.getreader ();
while (line = Reader.readline ())!= null) {
Json.append (line);
}
}
catch (Exception e) {
System.out.println ("Error reading JSON string:" + e.tostring ());
}
return json.tostring ();
}
}
Note: To introduce json.js and JSON source files, use Json.jar, source files See book source code Chapter III
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