HttpClient下载附件

使用HttpClient下载文件主要还是文件流的转化的东西比较烦一点。httpclient的东西比较简单的

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!!");
       }
}

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!!");
}
}

这个文章主要是参考自
http://www.hr.utah.edu/blog/2006/03/03/file-download-using-jakarta-commons-httpclient/
使用了缓冲，避免了IO的频繁读写。

还有一篇 http://weifly.javaeye.com/blog/145457
直接使用byte[]数组，比较便捷，但是没有使用缓冲，因为频繁的读写，看下来下载速度很慢。