在文件名路径和URL之间转换

/*
n o w j a v a . c o m - 时代Java
*/

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.net.MalformedURLException;

import java.net.URL;


public class Main {

  public static void main(String[] args) throws Exception {

    File file = new File("filename");

    URL url = null;

    try {

      url = file.toURL(); // file:/d:/folder1.4/java.io/filename/*来自 NowJava.com - 时代Java*/

    } catch (MalformedURLException e) {

    }

    file = new File(url.getFile()); // d:/folder1.4/java.io/filename

    try {

      InputStream is = url.openStream(