java获取网络文件大小

java里获取本地文件大小可以直接new File(url).length()，但是获取网络文件大小需要有点改动，代码如下，需要时自取：

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.log4j.Logger;

public class FileTest {
	private static final Logger logger = Logger
			.getLogger(FileTest.class);
	public static void main(String[] args){
		FileTest fileTest = new FileTest();
		String url = "http://211.64.201.201/uploadfile/nyz.mp3";
		try {
			System.out.println("文件大小:"+fileTest.getFileLength(url));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	/**
	 * 获取网络文件大小
	 * @param url
	 * @param type
	 * @return
	 * @throws IOException 
	 */
	private int getFileLength(String url1) throws IOException{
		int length=0;
		URL url;
		try {
			url = new  URL(url1);
			HttpURLConnection   urlcon=(HttpURLConnection)url.openConnection();   
			//根据响应获取文件大小 
			length=urlcon.getContentLength();
			urlcon.disconnect();
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}   
		return length;
	}
}