Here we can learn how we can use the JSON package in Java,by sending large data from JSP/Servlet to client Page using JSON and AJAX.
Tha main difference between JSONArray and JSONObject is that JSONArray uses ArrayList to store the data whereas JSONObject uses HashMap to store the data.
Here is the code:
Java Servlet implementing JSON
import org.json.simple.JSONObject;
public class json extends HttpServlet {
public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException{
JSONObject array= new JSONObject();
array.put("data1","Hello");
array.put("data2","World");
array.put("data3","Good");
array.put("data4","Morning");
}
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException{
doPost();
}
}
HTML code:
<html>
<head>
<script language="Javascript">
function getHTTPObject() {
var xmlhttp = false;
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e) {
try {
xmlhttp = new XMLHttpRequest();
}
catch (e) {
xmlhttp = false;
}
}
}
return xmlhttp;
}
var xmlhttp = new getHTTPObject(); //Initialize New Ajax Object
function Connect2RemoteSite(url,funcname,parameter) {
try {
if(xmlhttp) {
xmlhttp.open("POST", url, true); //URL will be the servlet page
xmlhttp.onreadystatechange = funcname;
xmlhttp.setRequestHeader(Content-Type, application/x-www-form-urlencoded);
xmlhttp.setRequestHeader("Content-Length", parameter.length);
xmlhttp.send(parameter);
}
else {
document.getElementById("rotateimage").style.display = "none";
alert("Your Browser dosen support Ajax");
}
}
catch(e) {
alert("Some Unknown Error Occured. Please Try Again" + e);
}
}
function AjaxResponse() {
if(xmlhttp.readyState == 4) {
if(xmlhttp.status == 200) {
//servletdetail holds the JSONArray Details
servletdetail = eval(xmlhttp.responseText);
}
}
}
</script>
</head>
<body>
</body>
</html>
Original Source:
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