java 远程读取windows下共享文件夹中的文件（File协议）

package test;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
public class openFile {
public void readRomateFile(String romatefilename){
        URL urlfile;
        BufferedReader in;
        PrintWriter out;
        String content = "";
        String inputLine;
        try{
            urlfile = new URL(romatefilename);
            in = new BufferedReader(new InputStreamReader(urlfile.openStream()));
            inputLine = in.readLine();
            while (inputLine != null){
                content += inputLine ;
                inputLine = in.readLine();
            }
            System.out.println(content);
            in.close();
        } catch (MalformedURLException e){
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
}
/**
* @param args
*/
public static void main(String[] args) {
        openFile of = new openFile();
        String romatefilename = "file:////IPADDRESS/share/test.txt";
        of.readRomateFile(romatefilename);
        
  }
}