android gson解析

最新推荐文章于 2024-04-15 01:20:46 发布

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本文介绍了一种使用Gson库解析JSON数据的方法，并通过一个Android应用实例展示了如何从网络获取JSON数据并利用Gson进行解析的过程。

首先要导包gson-2.2.4.jar到libs下

MainActivity.java


package com.json.web_study.test_01;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONObject;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

	private Button button;
	private MyHandler handler;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		button = (Button) findViewById(R.id.button1);
		button.setOnClickListener(this);

		handler = new MyHandler();
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		if (v.getId() == R.id.button1) {
			MyThread thread = new MyThread();
			thread.start();
		}
	}

	public String readData(InputStream inSream, String charsetName)
			throws Exception {
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = -1;
		while ((len = inSream.read(buffer)) != -1) {
			outStream.write(buffer, 0, len);
		}
		byte[] data = outStream.toByteArray();
		outStream.close();
		inSream.close();
		return new String(data, charsetName);
	}

	class MyThread extends Thread {
		@Override
		public void run() {
			try {
				URL url = new URL(
						"http://192.168.1.106:8080/MyWeb_Json/myjson2.json");
				HttpURLConnection conn = (HttpURLConnection) url
						.openConnection();

				InputStream input = conn.getInputStream();
				String json = readData(input, "utf-8");


				// 普通解析
				// JSONArray jlist=new JSONArray(Test.getJson());
				//
				// for (int i = 0; i < jlist.length(); i++) {
				// JSONObject jobj=jlist.getJSONObject(i);
				// String name=jobj.getString("name");
				// String address=jobj.getString("address");
				//
				// System.out.println(name+"---------"+address);
				//
				// Message message=new Message();
				// Bundle data=new Bundle();
				// data.putString("name", name);
				// data.putString("address", address);
				// message.setData(data);
				//
				// handler.sendMessage(message);
				//
				// sleep(1000);
				//
				// }

				// gson 解析 （导包）
				Gson gson = new Gson();
				Type listType = new TypeToken<List<Person>>() {
				}.getType();
				List<Person> persons = gson.fromJson(json, listType);

				for (int i = 0; i < persons.size(); i++) {
					System.out.println(persons.get(i).getName() + "---------"
							+ persons.get(i).getAddress());

					Message message = new Message();
					Bundle data = new Bundle();
					data.putString("name", persons.get(i).getName());
					data.putString("address", persons.get(i).getAddress());
					message.setData(data);

					handler.sendMessage(message);

					sleep(1000);
				}

			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
	}

	class MyHandler extends Handler {

		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			Bundle data = msg.getData();
			String name = data.getString("name");
			String address = data.getString("address");

			Toast.makeText(MainActivity.this, name + "---------" + address,
					Toast.LENGTH_SHORT).show();
		}

	}
}

manifest.xml


    <uses-permission android:name="android.permission.INTERNET"/>