通过 HttpClient 下载 文件

引用

需要有的Jar; 
    * commons-httpclient-3.1.jar 
    * commons-logging-1.04.jar 
    * commons-codec-1.3.jar 

 public class HttpClientTest {

     private final static String REMOTE_FILE_URL = "http://www.gjt.org/download/time/java/tar/javatar-2.5.tar.gz";

     private final static int BUFFER = 1024;

     public static void main(String[] args) {

        HttpClient client = new HttpClient();
        GetMethod httpGet = new GetMethod(REMOTE_FILE_URL);
         try {
             client.executeMethod(httpGet);

             InputStream in = httpGet.getResponseBodyAsStream();

             FileOutputStream out = new FileOutputStream(new File("E:\\test_jar\\javatar-2.5.tar.gz"));

             byte[] b = new byte[BUFFER];
             int len = 0;
             while((len=in.read(b))!= -1){
                 out.write(b,0,len);
             }
             in.close();
             out.close();

         }catch (HttpException e){
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }finally{
             httpGet.releaseConnection();
         }
         System.out.println("download, success!!");
        }
 }