URLコード解析

URLコード解析

package com.xwl;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

/**
 * url  ，  URL url2   url     decode  ， 
 * URL     encode  ，  url2  
 */
public class Test_url_coding {
    public static void main(String[] args) {
        //  
        String url = "https%3A%2F%2Fr1---sn-ci5gup-cags.googlevideo.com%2Fvideoplayback%3Fpcm2cms%3Dyes%26mime%3Dvideo%252Fmp4%26pl%3D21%26itag%3D22%26\u0026itag=43\u0026type=video%2Fwebm%3B+codecs%3D%22vp8.0%2C+vorbis%22\u0026quality=medium";
        //  
        String url2 = "https://r1---sn-ci5gup-cags.googlevideo.com/videoplayback?pcm2cms=yes&mime=video/mp4&pl=21&itag=22&&itag=43&type=video/webm; codecs=\"vp8.0, vorbis\"&quality=medium";
        //  url
        String decodeURL = decode(url);
        System.out.println("Decoded URL: " + decodeURL);
        //  url2
        String encodeURL = encode(url2);
        System.out.println("Encoded URL2: " + encodeURL);
    }

    //  
    //  url 
    public static String decode(String url) {
        try {
            String prevURL = "";
            String decodeURL = url;
            while (!prevURL.equals(decodeURL)) {
                prevURL = decodeURL;
                decodeURL = URLDecoder.decode(decodeURL, "UTF-8");
            }
            return decodeURL;
        } catch (UnsupportedEncodingException e) {
            return "Issue while decoding" + e.getMessage();
        }
    }
    //  
    public static String encode(String url) {
        try {
            String encodeURL = URLEncoder.encode(url, "UTF-8");
            return encodeURL;
        } catch (UnsupportedEncodingException e) {
            return "Issue while encoding" + e.getMessage();
        }
    }
}