HttpClient 使用get方式发送数据到服务器并下载服务器文件

助手类

public class HttpClientGetUtil {

      

       /***

       * 模拟表单提交数据

       * */

       public static String  loginGet(String url){

      HttpClient client = new DefaultHttpClient(); //客户端对象

      HttpGet get  = new HttpGet(url);             //请求对象

       try {

            HttpResponse httpResponse = client.execute(get); //连接服务器

             if(httpResponse.getStatusLine().getStatusCode()==200){ //当请求服务的返回值为200就说明请求成功了

          HttpEntity entity= httpResponse.getEntity();   

           return EntityUtils.toString(entity, "GBK");

            }

        

      } catch (ClientProtocolException e) {

             // TODO Auto-generated catch block

            e.printStackTrace();

      } catch (IOException e) {

             // TODO Auto-generated catch block

            e.printStackTrace();

      }

       return "" ;

      }

       /***

       * 下载文件

       * */

       public static void downFile(String urlStr,String target){

            HttpClient client = new DefaultHttpClient();

            HttpGet get = new HttpGet(urlStr);

            FileOutputStream fos= null;

             try {

                  HttpResponse response=client.execute(get);

                   if(response.getStatusLine().getStatusCode()==200){

                        HttpEntity entity = response.getEntity();

                         fos = new FileOutputStream(target);

                         fos.write(EntityUtils. toByteArray(entity));        //写入到磁盘

                         System. out.println("sucess!" );

                         /*

                         InputStream  is = entity.getContent();

                         byte [] b = new byte[1024*800];

                         int tem =0;

                         while(( tem=is.read())!=-1){

                               fos.write(b, 0, tem);

                         }

                         */  

                  }

                  fos.flush();

                  fos.close();

            } catch (ClientProtocolException e) {

                   // TODO Auto-generated catch block

                  e.printStackTrace();

            } catch (IOException e) {

                   // TODO Auto-generated catch block

                  e.printStackTrace();

            }

            

      }

}

测试类

public class HttpClientGetTest {

       public static void main(String[] args) {

             // TODO Auto-generated method stub

//       String url ="http://localhost:8080/mp3/servlet/HttpClientServlet";

//       Scanner s = new Scanner(System.in);

//       System.out.println("请输入用户名");

//       String name = s.next();

//       System.out.println("请输入密码");

//       String password = s.next();

//       String urlstr=url +"?"+"username="+name+"&password="+password;

//       System.out.println( urlstr);

//       String msg= HttpClientGetUtil.loginGet(urlstr);

//       System.out.println( msg);

       String str1 = "http://localhost:8080/mp3/aixi.jpg" ;

       String target= "d:\\aixi.jpg";

       HttpClientGetUtil. downFile(str1, target)

     

      }

}