Android 网络编程相关

1.HttpClient

     1.1   Get

//先将参数放入List，再对参数进行URL编码

  List<BasicNameValuePair> params = new LinkedList<BasicNameValuePair>();

  params.add( new BasicNameValuePair( "param1" , "中国" ));

  params.add( new BasicNameValuePair( "param2" , "value2" ));

  //对参数编码

  String param = URLEncodedUtils.format(params, "UTF-8" );

  //baseUrl     

  String baseUrl = "http://ubs.free4lab.com/php/method.php" ;

  //将URL与参数拼接

  HttpGet getMethod = new HttpGet(baseUrl + "?" + param);

  HttpClient httpClient = new DefaultHttpClient();

  try {

   HttpResponse response = httpClient.execute(getMethod); //发起GET请求

   Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码

   Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8" )); //获取服务器响应内容

  } catch (ClientProtocolException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  } catch (IOException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  }










1.2   Host


//和GET方式一样，先将参数放入List

params = new LinkedList<BasicNameValuePair>();

params.add( new BasicNameValuePair( "param1" , "Post方法" ));

params.add( new BasicNameValuePair( "param2" , "第二个参数" ));

try {

  HttpPost postMethod = new HttpPost(baseUrl);

  postMethod.setEntity( new UrlEncodedFormEntity(params, "utf-8" )); //将参数填入POST Entity中

  HttpResponse response = httpClient.execute(postMethod); //执行POST方法

  Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码

  Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8" )); //获取响应内容

} 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();

}

2.HttpURLConnection

1)创建一个URL对象

URL url = new URL(http://www.baidu.com);

2)利用HttpURLConnection对象从网络中获取网页数据

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

3)设置连接超时

conn.setConnectTimeout(6*1000);

4)对响应码进行判断

if (conn.getResponseCode() != 200)    //从Internet获取网页,发送请求,将网页以流的形式读回来

throw new RuntimeException("请求url失败");

5)得到网络返回的输入流

InputStream is = conn.getInputStream();
6)String result = readData(is, "GBK"); //文件流输入出文件用outStream.write
7)conn.disconnect();