Code for index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#id1").click(function() {
$.ajax({
url : "./TestServ",
type : "POST",
data: { json: JSON.stringify({
exam : {
"text" : "ABC",
"msg" : "9551667858",
"all" : [ {
"name" : "one"
}, {
"name" : "two"
} ],
"obj" : {
"firstname" : "John",
"lastname" : "Doe"
}
}
})},
dataType : "json",
success : function(result) {
alert(result);
$("#id2").html(result);
},
error : function(result) {
$("#id2").html("Error Occured! Contact with Admin.");
}
});
});
});
</script>
</head>
<body>
<button id="id1">Send back</button>
<p id="id2"></p>
</body>
</html>
Code for TestServ.java
package com.t4b.test;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
@WebServlet("/TestServ")
public class TestServ extends HttpServlet {
private static final long serialVersionUID = 1L;
public TestServ() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
System.out.println("Hello world!");
String jsonString = request.getParameter("json");
try {
JSONObject jsonObj = new JSONObject(jsonString);
JSONObject examObj = jsonObj.getJSONObject("exam");
System.out.println(examObj.getString("text"));
System.out.println(examObj.getString("msg"));
JSONArray allArray = examObj.getJSONArray("all");
System.out.println(allArray);
List<String> list = new ArrayList<String>();
for (int i = 0; i < allArray.length(); i++) {
list.add(allArray.getJSONObject(i).getString("name"));
System.out.println(" " + list.get(i));
}
JSONObject objObj = examObj.getJSONObject("obj");
System.out.println(objObj);
System.out.println(objObj.getString("firstname"));
} catch (JSONException e) {
e.printStackTrace();
}
// System.out.println(jsonString);
out.print(jsonString);
}
}
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