Android的HttpConnection和HttpClient发送请求

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package com.mine.networktest;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener {    public static final int SHOW_RESPONSE = 0;    public static final int SHOW_HttpClient = 0;    private Button sendRequest_btn;    private Button httpClient_btn;    private TextView responseTest;    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {            case SHOW_RESPONSE:                String response = (String) msg.obj;                // 在这里进行UI操作，将结果显示到界面上                responseTest.setText(response);            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        sendRequest_btn = (Button) findViewById(R.id.send_request);        httpClient_btn = (Button)findViewById(R.id.http_client);        responseTest = (TextView) findViewById(R.id.response_text);        sendRequest_btn.setOnClickListener(this);        httpClient_btn.setOnClickListener(this);    }    @Override    public void onClick(View v) {        // TODO Auto-generated method stub        switch (v.getId() ) {        case R.id.send_request:            sendRequestWithHttpURLConnection();            break;        case R.id.http_client:            sendRequestWithHttpClient();            break;        default:            break;        }    }    private void sendRequestWithHttpClient() {        // TODO Auto-generated method stub        new Thread(new Runnable() {            @Override            public void run() {                // TODO Auto-generated method stub                HttpClient httpClient = new DefaultHttpClient();                HttpGet httpGet = new HttpGet("http://www.baidu.com");                try {                    HttpResponse httpResponse = httpClient.execute(httpGet);                    if (httpResponse.getStatusLine().getStatusCode()==200) {                        //请求和响应都成功了                        HttpEntity entity = httpResponse.getEntity();                        String response = EntityUtils.toString(entity, "utf-8");                        Message msg = new Message();                        msg.what = SHOW_RESPONSE;                        //将服务器返回的结果放在Message中                        msg.obj = response.toString();                        handler.sendMessage(msg);                    }                } catch (ClientProtocolException e) {                    e.printStackTrace();                } catch (IOException e) {                    e.printStackTrace();                }            }        }).start();    }    private void sendRequestWithHttpURLConnection() {        // 开启线程发送网络请求        new Thread(new Runnable() {            @Override            public void run() {                HttpURLConnection connection = null;                try {                    URL url = new URL("http://www.haidu.com");                    connection = (HttpURLConnection) url.openConnection();                    connection.setRequestMethod("GET");                    connection.setConnectTimeout(8000);                    connection.setReadTimeout(8000);                    InputStream is = connection.getInputStream();                    // 对获取到的输入流进行读取                    BufferedReader reader = new BufferedReader(                            new InputStreamReader(is));                    StringBuilder response = new StringBuilder();                    String line;                    while ((line = reader.readLine()) != null) {                        response.append(line);                    }                    Message msg = new Message();                    msg.what = SHOW_RESPONSE;                    // 将服务器返回的结果保存在message中                    msg.obj = response.toString();                    handler.sendMessage(msg);                } catch (Exception e) {                    e.printStackTrace();                } finally {                    if (connection != null) {                        connection.disconnect();                    }                }            }        }).start();    }}
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