android HTTPclient

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

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

　　

2.Post 请求

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Map<String, String> map = new HashMap<String, String>(); map.put("id", id); map.put("name", name); map.put("permission", String.valueOf(permission));    List<NameValuePair> list = new ArrayList<NameValuePair>();  if(map != null && !map.isEmpty()){  for(Map.Entry<String, String> 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

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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

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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<String,String> map,String encode){        List<NameValuePair> list = new ArrayList<NameValuePair>();        if(map != null && !map.isEmpty()){            for(Map.Entry<String, String> 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<String, String> map = new HashMap<String, String>();          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

不过结构已经很清晰啦。。。。