设置权限，在AndroidManifest.xml加入

 

public class MainActivity extends Activity {    private EditText address; private Button getbutton; private TextView text; @Override protected void onCreate(Bundle savedInstanceState) { //版本4.0后需加这个，不然就报错android.os.NetworkOnMainThreadException StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder() .detectDiskReads().detectDiskWrites().detectNetwork() .penaltyLog().build()); StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder() .detectLeakedSqlLiteObjects().detectLeakedClosableObjects() .penaltyLog().penaltyDeath().build()); // super.onCreate(savedInstanceState); setContentView(R.layout.test); //初始化 address = (EditText) findViewById(R.id.address); getbutton = (Button) findViewById(R.id.getbutton); text = (TextView) findViewById(R.id.text); getbutton.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String url = address.getText().toString(); getPDAServerData(url); } }); } public void getPDAServerData(String url) { HttpClient client = new DefaultHttpClient(); HttpPost request; try { request = new HttpPost(url); //调用HttpClient对象的execute(HttpUriRequest request)发送请求，返回一个HttpResponse HttpResponse response = client.execute(request); //返回响应码为200 if (response.getStatusLine().getStatusCode() == 200) { //从响应中获取消息实体 HttpEntity entity = response.getEntity(); if (entity != null) { String out = EntityUtils.toString(entity); text.setText(out); } } } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }