HTTP访问的两种方式（HttpClient和HttpURLConnection）

直接上代码

使用HttpClient

NameValuePair nameValuePair1 = new BasicNameValuePair("name", "yang");
NameValuePair nameValuePair2 = new BasicNameValuePair("pwd","123123");
List nameValuePairs = new ArrayList();
nameValuePairs.add(nameValuePair1);
nameValuePairs.add(nameValuePair2);
String validateURL = "http://10.0.2.2:8080/testhttp1/TestServlet";

try {

        HttpParams httpParams = new BasicHttpParams();

        HttpConnectionParams.setConnectionTimeout(httpParams,5000); //设置连接超时为5秒

        HttpClient client = new DefaultHttpClient(httpParams); // 生成一个http客户端发送请求对象

        HttpPost httpPost = new HttpPost(urlString); //设定请求方式

          if (nameValuePairs!=null && nameValuePairs.size()!=0) {
              //把键值对进行编码操作并放入HttpEntity对象中
              httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs,HTTP.UTF_8));
           }

        HttpResponse httpResponse = client.execute(httpPost); // 发送请求并等待响应

          // 判断网络连接是否成功
          if (httpResponse.getStatusLine().getStatusCode() != 200) {
             System.out.println("网络错误异常！!!!");

             return false;
           }

        HttpEntity entity = httpResponse.getEntity(); // 获取响应里面的内容
        inputStream = entity.getContent();  // 得到服务气端发回的响应的内容（都在一个流里面）
        // 得到服务气端发回的响应的内容（都在一个字符串里面）
        // String strResult = EntityUtils.toString(entity); 

      } catch (Exception e) {
   System.out.println("这是异常！");
  }

 

使用HttpURLConnection

String validateURL="http://10.0.2.2:8080/testhttp1/TestServlet?name=yang&pwd=123123";

try {

       URL url = new URL(validateUrl); //创建URL对象

       //返回一个URLConnection对象，它表示到URL所引用的远程对象的连接

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

       conn.setConnectTimeout(5000); //设置连接超时为5秒

       conn.setRequestMethod("GET"); //设定请求方式

       conn.connect(); //建立到远程对象的实际连接

       //返回打开连接读取的输入流

       DataInputStream dis = new DataInputStream(conn.getInputStream());  

      //判断是否正常响应数据 

        if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {
           System.out.println("网络错误异常！!!!");

           return  false;
       }

} catch (Exception e) {
   e.printStackTrace();
   System.out.println("这是异常！");
  } finally {
    if (conn != null) {
     conn.disconnect(); //中断连接
    }
 }