使用HttpClient请求一个网页

 1 package com.exp.httpdemo;
 2 
 3 import java.io.InputStream;
 4 
 5 import org.apache.http.HttpEntity;
 6 import org.apache.http.HttpResponse;
 7 import org.apache.http.client.HttpClient;
 8 import org.apache.http.client.methods.HttpGet;
 9 import org.apache.http.impl.client.DefaultHttpClient;
10 import org.apache.http.util.EntityUtils;
11 
12 import android.os.Bundle;
13 import android.os.Handler;
14 import android.app.Activity;
15 import android.view.Menu;
16 import android.view.View;
17 import android.widget.TextView;
18 
19 /**
20  * 使用HttpClient请求一个网页
21  *
22  */
23 public class MainActivity extends Activity {
24     TextView tvResult;
25     String url="http://www.baidu.com";
26     Handler handler = new Handler();
27     @Override
28     protected void onCreate(Bundle savedInstanceState) {
29         super.onCreate(savedInstanceState);
30         setContentView(R.layout.activity_main);
31         
32         tvResult=(TextView)findViewById(R.id.textView1);
33     }
34 
35     public void ClickButton(View view){
36         new Thread(new Runnable() {
37             
38             @Override
39             public void run() {
40                 // 获取HttpClient对象
41                 HttpClient httpClient = new DefaultHttpClient();
42                 // 获取HttpGet对象
43                 HttpGet requestGet = new HttpGet(url);
44                 try {
45                     // 获取响应结果
46                     HttpResponse httpResponse = httpClient.execute(requestGet);
47                     if (httpResponse.getStatusLine().getStatusCode() == 200) {
48                         // 从响应中取出实体类
49                         HttpEntity httpEntity = httpResponse.getEntity();
50                         final String result=EntityUtils.toString(httpEntity);
51                         // 如果想通过IO流来读写可以使用getContent方法获取
52                         //InputStream in = httpEntity.getContent();
53                         handler.post(new Runnable() {
54                             
55                             @Override
56                             public void run() {
57                                 tvResult.setText(result);
58                             }
59                         });
60                     }
61                 } catch (Exception e) {
62                     e.printStackTrace();
63                     
64                 }
65             }
66         }).start();
67         
68     
69     }
70     @Override
71     public boolean onCreateOptionsMenu(Menu menu) {
72         // Inflate the menu; this adds items to the action bar if it is present.
73         getMenuInflater().inflate(R.menu.main, menu);
74         return true;
75     }
76     
77 }