Apache包是对android联网访问封装的很好的一个包，也是android访问网络最常用的类。

下面分别讲一下怎么用HttpClient实现get，post请求。

1.Get 请求

HttpGet get = new HttpGet("http://www.baidu.com"); HttpClient hClient = new DefaultHttpClient(); httpResponse = hClient.execute(get);

2.Post 请求

Map
     
       map = new HashMap
      
       ();map.put("id", id);map.put("name", name);map.put("permission", String.valueOf(permission));  List
       
         list = new ArrayList
        
         (); if(map != null && !map.isEmpty()){ for(Map.Entry
         
           entry : map.entrySet()){
   //迭代器 //键值对 NameValuePair nameValuePair = new BasicNameValuePair(entry.getKey(), entry.getValue()); list.add(nameValuePair); } } UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list ,encode);//使用post方式提交数据HttpPost post = new HttpPost(path);post.setEntity(entity);//请求体中//默认客户端HttpClient client = httpClient; HttpResponse httpResponse = client.execute(post);
         
        
       
      
     

3.代码实例：

先是get请求

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader;    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.DefaultHttpClientConnection; import org.apache.http.impl.client.DefaultHttpClient;    import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button;    public class MainActivity extends Activity {        private Button requestButton;     private HttpResponse httpResponse;     private HttpEntity entity;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         requestButton = (Button) findViewById(R.id.requestButton);                    requestButton.setOnClickListener(new OnClickListener() {                            public void onClick(View v) {                  new Thread(new Downtest()).start();             }         });     }    class Downtest implements Runnable{          public void run() {         //生成一个请求对象,请求             HttpGet get = new HttpGet("http://www.baidu.com");             //生成一个Http客户端对象             HttpClient hClient = new DefaultHttpClient();             //使用Http客户端发送请求对象             InputStream inputStream = null;             try {                 httpResponse = hClient.execute(get);//httpResponse返回的响应               //返回的响应数据就放在里边                                 entity = httpResponse.getEntity();                 inputStream = entity.getContent();                 BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));                 String result = "";                 String line = "";                while((line = reader.readLine())!= null){                    result = result+ line;                }                System.out.println(result);             } catch (ClientProtocolException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             } catch (IOException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             }finally{                 try{                     inputStream.close();                 }catch(Exception e){                     e.printStackTrace();                 }             }      }    }        }

再是post请求

public class AccountHttpUtils {        //private static String PATH = "http://192.168.253.1:8088/CallName/servlet/AccountServler";     private static HttpClient httpClient;     public AccountHttpUtils(HttpClient httpClient) {            this.httpClient = httpClient;     }    public static String sendHttpClient(String path,Map
     
       map,String encode){       List
      
        list = new ArrayList
       
        ();       if(map != null && !map.isEmpty()){           for(Map.Entry
        
          entry : map.entrySet()){
   //迭代器               //键值对               NameValuePair nameValuePair = new BasicNameValuePair(entry.getKey(), entry.getValue());               list.add(nameValuePair);           }       }       try {           //实现将请求的参数封装到表单中，         UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list ,encode);         //使用post方式提交数据         HttpPost post = new HttpPost(path);         post.setEntity(entity);//请求体中         //默认客户端         HttpClient client = httpClient;                    HttpResponse httpResponse = client.execute(post);         if(httpResponse.getStatusLine().getStatusCode() == 200){             HttpEntity httpEntity = httpResponse.getEntity();             InputStream inputStream = httpEntity.getContent();             return changeInputeStream(inputStream, encode);         }     } catch (UnsupportedEncodingException e) {         // TODO Auto-generated catch block         e.printStackTrace();     } catch (ClientProtocolException e) {         // TODO Auto-generated catch block         e.printStackTrace();     } catch (IOException e) {         // TODO Auto-generated catch block         e.printStackTrace();     }                return "";    }    /**    * 将一个输入流转换成字符串    * @param inputStream    * @param encode    * @return    */    private static String changeInputeStream(InputStream inputStream,String encode) {        //通常叫做内存流，写在内存中的         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();         byte[] data = new byte[1024];         int len = 0;         String result = "";         if(inputStream != null){             try {                 while((len = inputStream.read(data))!=-1){                     data.toString();                     outputStream.write(data, 0, len);                 }                 //result是在服务器端设置的doPost函数中的                 result = new String(outputStream.toByteArray(),encode);                 outputStream.flush();                 outputStream.close();                 inputStream.close();             } catch (IOException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             }         }         return result;     }     public static String set(String id,String name,int permission) {         // TODO Auto-generated method stub         Map
         
           map = new HashMap
          
           (); map.put("id", id); map.put("name", name); map.put("permission", String.valueOf(permission)); String result = AccountHttpUtils.sendHttpClient(AbstractHttpUtils.PATH+"servlet/AccountServler", map, "utf-8"); System.out.println("result:"+ result); return result; } }
          
         
        
       
      
     

　4.get请求访问的是百度，返回的是百度首页的源代码

        post是我的一个小项目中的类