android项目，从服务器端返回JSON数据，在android客户端进行显示。

首先使用java代码实现网络的连接。

定义 HttpUtil类。

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpUtil {

	public static String getJsonContent(String url_path) {
		InputStream inputStream = null;
		try {
			URL url = new URL(url_path);
			HttpURLConnection connection = (HttpURLConnection) url
					.openConnection();
			connection.setConnectTimeout(3000);
			connection.setRequestMethod("GET");
			connection.setDoInput(true);
			int code = connection.getResponseCode();
			System.out.println("code=================" + code);
			if (code == 200) {
				inputStream = connection.getInputStream();
				return chageInputStream(inputStream);// 调用下面的方法，将流变为字符返回。
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return "";
	}

	private static String chageInputStream(InputStream inputStream) {
		// TODO Auto-generated method stub
		String jsonString = "";
		ByteArrayOutputStream bStream = new ByteArrayOutputStream();
		int len = 0;
		byte[] data = new byte[1024];

		if (inputStream != null) {
			try {
				while ((len = inputStream.read(data)) != -1) {
					bStream.write(data, 0, len);
				}
				jsonString = new String(bStream.toByteArray());
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return jsonString;
	}
}

Person类我就不给大家列举了。

接下来定义了一个JsonTool类，实现JSON数据的解析。

import org.json.JSONObject;

public class JsonTool {

	public static Person getPerson(String key, String jsonString) {
		Person person = new Person();
		try {
			JSONObject jsonObject = new JSONObject(jsonString);
			JSONObject personObject=jsonObject.getJSONObject("person");//获取到key值。
			person.setId(personObject.getInt("id"));
			person.setName(personObject.getString("name"));
			person.setAddress(personObject.getString("address"));
		} catch (Exception e) {
			// TODO: handle exception
		}
		return person;
	}
}

当然我们在主界面就是添加了一个Button，点击触发事件，进行解析。

public class MainActivity extends Activity {
	Button button;

	@SuppressLint("NewApi")
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		button = (Button) findViewById(R.id.person);
		button.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				String patString = "http://192.168.3.2:8080/TestServer/servlet/JsonAction?action_flag=person";
				String jsonString = HttpUtil.getJsonContent(patString);
				Person person = JsonTool.getPerson("person", jsonString);
				System.out.println(person.getName());
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}

因为访问了网络，需要添加一个网络权限。anroid.permission.INTERNET

服务器端的代码大家可以参考这篇博客http://blog.csdn.net/shyboyes/article/details/38419807。

同时，工程文件在http://download.csdn.net/detail/fengzy1990/7730683可以下载。