How Parse PHP JSON DATA BY JAVA

API.java

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;


public class API {
	private String webPageUrl="";
	public API(String URL){
		this.webPageUrl=URL;
	}
	public String getContent(){
		StringBuilder sb=new StringBuilder();
		try {
			URL url=new URL(this.webPageUrl);
			InputStream stream=url.openStream();
			BufferedInputStream bf=new BufferedInputStream(stream);			
			while (true) {
				int data=bf.read();
				if(data==-1){
					break;
				}else{
					sb.append((char)data);
				}
			}
			
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return sb.toString();
	}
}

API.php

http://localhost/API/API.java
<?php
$array=array();
$user['uid']=121;
$user['username']="adidac";
$user['password']="adidacpass";
$array['users'][]=$user;
$user['uid']=122;
$user['username']="biswarup";
$user['password']="biswaruppass";
$array['users'][]=$user;
$user['uid']=123;
$user['username']="gopal";
$user['password']="gopalpass";
$array['users'][]=$user;
echo json_encode($array);

jsonex.java

import com.google.gson.Gson;


public class jsonex {

	public static void main(String[] args) {
		API API=new API("http://localhost/api/api.php");
		String MyJson=API.getContent();
		Gson gson = new Gson();
		Users a=gson.fromJson(MyJson, Users.class);
		User u=new User();
		for (int i = 0; i <a.getUsers().size(); i++) {
			u=a.getUsers().get(i);
			System.out.println(u.getUid());
			System.out.println(u.getUsername());
			System.out.println(u.getPassword());
			
		}
	}

}

Programme OutPut

121
adidac
adidacpass
122
biswarup
biswaruppass
123
gopal
gopalpass

User.java

public class User {
	private int uid;
	private String username;
	private String password;
	public int getUid() {
		return uid;
	}
	public void setUid(int uid) {
		this.uid = uid;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
}

Users.java

import java.util.ArrayList;

public class Users {
	private ArrayList<User> users = new ArrayList<User>();

	public void setUsers(User user) {
		users.add(user);
	}

	public ArrayList<User> getUsers() {
		return users;
	}

}

Download google-gson Java Library
http://code.google.com/p/google-gson/downloads/list