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

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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 blocke.printStackTrace();}return "";}private static String chageInputStream(InputStream inputStream) {// TODO Auto-generated method stubString 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 blocke.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")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button = (Button) findViewById(R.id.person);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString 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());}});}@Overridepublic 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;}@Overridepublic 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。

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