Android应用开发--Http

一：JDK中HttpURLConnection

Get

URL url = new URL("string url"):HttpURLConnection connection = (HttpURLConnection) url.openConnection();InputStreamReader in = new InputStreamReader(connection.getInputStream());BufferedReader bufferedReader = new BufferedReader(in);StringBuffer strBuffer = new StringBuffer();String line = null;while ((line = bufferedReader.readLine()) != null) {    strBuffer.append(line);}result = strBuffer.toString();if (connection != null) {    connection.disconnect();}if (in != null) {  try {     in.close();  } catch (IOException e) {     e.printStackTrace();  }}

Post

public String executeHttpPost() {    String result = null;    URL url = null;    HttpURLConnection connection = null;    InputStreamReader in = null;    try {        url = new URL("string url");        connection = (HttpURLConnection) url.openConnection();        connection.setDoInput(true);        connection.setDoOutput(true);        connection.setRequestMethod("POST");        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");        connection.setRequestProperty("Charset", "utf-8");//写入参数        DataOutputStream dop = new DataOutputStream(connection.getOutputStream());        dop.writeBytes("token=xxxxxxx");        dop.flush();        dop.close();        in = new InputStreamReader(connection.getInputStream());        BufferedReader bufferedReader = new BufferedReader(in);        StringBuffer strBuffer = new StringBuffer();        String line = null;        while ((line = bufferedReader.readLine()) != null) {            strBuffer.append(line);        }        result = strBuffer.toString();    } catch (Exception e) {        e.printStackTrace();    } finally {        if (connection != null) {            connection.disconnect();    }    if (in != null) {        try {        in.close();        } catch (IOException e) {        e.printStackTrace();        }        }    }    return result;}

URLDecoder.decode("测试","utf-8");
URLEncoder.encode("测试","utf-8")

二：Apache的HttpClient

Get

HttpGet get=new HttpGet("str url?name=xxx&pwd=xxx");  HttpClient cliet=new DefaultHttpClient();  try {      HttpResponse response=cliet.execute(get);      HttpEntity entity=response.getEntity();      InputStream is=entity.getContent();      BufferedReader br=new BufferedReader(new InputStreamReader(is));      String line=null;      StringBuffer sb=new StringBuffer();      while((line=br.readLine())!=null){          sb.append(line);      }      System.out.println(sb.toString());  } catch (ClientProtocolException e) {      e.printStackTrace();  } catch (IOException e) {      e.printStackTrace();  } 

Post

//创建默认的客户端对象  HttpClient cliet=new DefaultHttpClient();  //用list封装要向服务器端发送的参数  List<BasicNameValuePair> pairs=new ArrayList<BasicNameValuePair>();  pairs.add(new BasicNameValuePair("name", "xxx")); pairs.add(new BasicNameValuePair("pwd", "xxx"));   try {      //用UrlEncodedFormEntity来封装List对象      UrlEncodedFormEntity urlEntity=new UrlEncodedFormEntity(pairs);      //设置使用的Entity      post.setEntity(urlEntity);      try {          //客户端开始向指定的网址发送请求          HttpResponse response=cliet.execute(post);          //获得请求的Entity          HttpEntity entity=response.getEntity();          InputStream is=entity.getContent();          //下面是读取数据的过程          BufferedReader br=new BufferedReader(new InputStreamReader(is));          String line=null;          StringBuffer sb=new StringBuffer();          while((line=br.readLine())!=null){              sb.append(line);          }          System.out.println(sb.toString());      } catch (ClientProtocolException e) {          e.printStackTrace();      } catch (IOException e) {          e.printStackTrace();      }  } catch (UnsupportedEncodingException e) {      e.printStackTrace();  } 

三- 超时Sample

<span style="color:#404040;">private class XmlAsyncLoader extends XmlResourceRequest {     private boolean mIsCancle = false;   private HttpGet mGet;   private HttpClient mHttp;     public XmlAsyncLoader(MxActivity<?> activity, String url)   throws MalformedURLException {   super(activity, url);   }     @Override   protected void doTaskInBackground() {   // 请求数据   if (mUrl.toLowerCase().startsWith("http://")) {   mGet = initHttpGet(mUrl);   mHttp = initHttp();   try {   HttpResponse response = mHttp.execute(mGet);   if (mIsCancle) {   return;   }   if (response != null) {   if(response.getStatusLine().getStatusCode()!=HttpStatus.SC_OK){   onResponseError("network error");   Log.v(TAG, "the code is :"+response.getStatusLine().getStatusCode());   return;   }   notifyUpdateProgress(70);   Document doc = getDocumet(response);   Element root = doc.getDocumentElement();   NodeList appList = root   .getElementsByTagName(Item_ELEMENT_NAME);   final int len = appList.getLength();   if (len <= 0) {// 没有items   onFoundNoItems();   return;   }   for (int i = 0; i < len; i++) {   Element item = (Element) appList.item(i);   if (item.getNodeType() == Node.ELEMENT_NODE) {   HahaItemInfo info = createHahaItemIno(item);   if (mIsCancle){   return;   }   onFoundItem(info, 80 + 20 * (i + 1) / len);   addUrlToQueue(info.userIconUrl);   }   };      }   }catch(ConnectTimeoutException e){   onResponseError("time out");   } catch (ClientProtocolException e) {   --mCurrentPage;   e.printStackTrace();   } catch (IOException e) {   --mCurrentPage;   e.printStackTrace();   } catch (XmlPullParserException e) {   --mCurrentPage;   e.printStackTrace();   }finally{   notifyLoadFinish();   notifyLoadImages();   mHttp.getConnectionManager().shutdown();   }     }   }       private HttpClient initHttp() {   HttpClient client = new DefaultHttpClient();  </span><span style="color:#cc0000;"> client.getParams().setIntParameter(   HttpConnectionParams.SO_TIMEOUT, TIME_OUT_DELAY); // 超时设置   client.getParams().setIntParameter(   HttpConnectionParams.CONNECTION_TIMEOUT, TIME_OUT_DELAY);// 连接超时  </span><span style="color:#404040;"> return client;   }     private HttpGet initHttpGet(String mUrl) {   HttpGet get = new HttpGet(mUrl);   initHeader(get);   return get;   }       @Override   public boolean tryCancel() {   Log.i(TAG, "tryCanle is working");   mGet.abort();   mIsCancle = true;   mHttp.getConnectionManager().shutdown();   notifyLoadFinish();   return true;   }     }  </span>

URLEncoder.encode("测试","utf-8")

2URLDecoder.decode("测试","utf-8");