java获取网络文件大小

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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 blocke.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 blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}   return length;}}

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