Java实现迅雷地址转成普通地址实例代码

package th;import java.io.*; /**  * Base64 编码和解码。  *  * @author 宋立君  * @date 2014年07月03日  */ public class Base64 {   public Base64() {   }   /**    * 功能：编码字符串    *    * @author 宋立君    * @date 2014年07月03日    * @param data    *   源字符串    * @return String    */   public static String encode(String data) {     return new String(encode(data.getBytes()));   }     /**    * 功能：解码字符串    *    * @author 宋立君    * @date 2014年07月03日    * @param data    *   源字符串    * @return String    */   public static String decode(String data) {     return new String(decode(data.toCharArray()));   }     /**    * 功能：编码byte[]    *    * @author 宋立君    * @date 2014年07月03日    * @param data    *   源    * @return char[]    */   public static char[] encode(byte[] data) {     char[] out = new char[((data.length + 2) / 3) * 4];     for (int i = 0, index = 0; i < data.length; i += 3, index += 4) {       boolean quad = false;       boolean trip = false;         int val = (0xFF & (int) data[i]);       val <<= 8;       if ((i + 1) < data.length) {         val |= (0xFF & (int) data[i + 1]);         trip = true;       }       val <<= 8;       if ((i + 2) < data.length) {         val |= (0xFF & (int) data[i + 2]);         quad = true;       }       out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];       val >>= 6;       out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];       val >>= 6;       out[index + 1] = alphabet[val & 0x3F];       val >>= 6;       out[index + 0] = alphabet[val & 0x3F];     }     return out;   }     /**    * 功能：解码    *    * @author 宋立君    * @date 2014年07月03日    * @param data    *   编码后的字符数组    * @return byte[]    */   public static byte[] decode(char[] data) {       int tempLen = data.length;     for (int ix = 0; ix < data.length; ix++) {       if ((data[ix] > 255) || codes[data[ix]] < 0) {         --tempLen; // ignore non-valid chars and padding       }     }     // calculate required length:     // -- 3 bytes for every 4 valid base64 chars     // -- plus 2 bytes if there are 3 extra base64 chars,     // or plus 1 byte if there are 2 extra.       int len = (tempLen / 4) * 3;     if ((tempLen % 4) == 3) {       len += 2;     }     if ((tempLen % 4) == 2) {       len += 1;       }     byte[] out = new byte[len];       int shift = 0; // # of excess bits stored in accum     int accum = 0; // excess bits     int index = 0;       // we now go through the entire array (NOT using the 'tempLen' value)     for (int ix = 0; ix < data.length; ix++) {       int value = (data[ix] > 255) ? -1 : codes[data[ix]];         if (value >= 0) { // skip over non-code         accum <<= 6; // bits shift up by 6 each time thru         shift += 6; // loop, with new bits being put in         accum |= value; // at the bottom.         if (shift >= 8) { // whenever there are 8 or more shifted in,           shift -= 8; // write them out (from the top, leaving any           out[index++] = // excess at the bottom for next iteration.           (byte) ((accum >> shift) & 0xff);         }       }     }       // if there is STILL something wrong we just have to throw up now!     if (index != out.length) {       throw new Error("Miscalculated data length (wrote " + index           + " instead of " + out.length + ")");     }       return out;   }     /**    * 功能：编码文件    *    * @author 宋立君    * @date 2014年07月03日    * @param file    *   源文件    */   public static void encode(File file) throws IOException {     if (!file.exists()) {       System.exit(0);     }       else {       byte[] decoded = readBytes(file);       char[] encoded = encode(decoded);       writeChars(file, encoded);     }     file = null;   }     /**    * 功能：解码文件。    *    * @author 宋立君    * @date 2014年07月03日    * @param file    *   源文件    * @throws IOException    */   public static void decode(File file) throws IOException {     if (!file.exists()) {       System.exit(0);     } else {       char[] encoded = readChars(file);       byte[] decoded = decode(encoded);       writeBytes(file, decoded);     }     file = null;   }     //   // code characters for values 0..63   //   private static char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="       .toCharArray();     //   // lookup table for converting base64 characters to value in range 0..63   //   private static byte[] codes = new byte[256];   static {     for (int i = 0; i < 256; i++) {       codes[i] = -1;       // LoggerUtil.debug(i + "&" + codes[i] + " ");     }     for (int i = 'A'; i <= 'Z'; i++) {       codes[i] = (byte) (i - 'A');       // LoggerUtil.debug(i + "&" + codes[i] + " ");     }       for (int i = 'a'; i <= 'z'; i++) {       codes[i] = (byte) (26 + i - 'a');       // LoggerUtil.debug(i + "&" + codes[i] + " ");     }     for (int i = '0'; i <= '9'; i++) {       codes[i] = (byte) (52 + i - '0');       // LoggerUtil.debug(i + "&" + codes[i] + " ");     }     codes['+'] = 62;     codes['/'] = 63;   }     private static byte[] readBytes(File file) throws IOException {     ByteArrayOutputStream baos = new ByteArrayOutputStream();     byte[] b = null;     InputStream fis = null;     InputStream is = null;     try {       fis = new FileInputStream(file);       is = new BufferedInputStream(fis);       int count = 0;       byte[] buf = new byte[16384];       while ((count = is.read(buf)) != -1) {         if (count > 0) {           baos.write(buf, 0, count);         }       }       b = baos.toByteArray();       } finally {       try {         if (fis != null)           fis.close();         if (is != null)           is.close();         if (baos != null)           baos.close();       } catch (Exception e) {         System.out.println(e);       }     }       return b;   }     private static char[] readChars(File file) throws IOException {     CharArrayWriter caw = new CharArrayWriter();     Reader fr = null;     Reader in = null;     try {       fr = new FileReader(file);       in = new BufferedReader(fr);       int count = 0;       char[] buf = new char[16384];       while ((count = in.read(buf)) != -1) {         if (count > 0) {           caw.write(buf, 0, count);         }       }       } finally {       try {         if (caw != null)           caw.close();         if (in != null)           in.close();         if (fr != null)           fr.close();       } catch (Exception e) {         System.out.println(e);       }     }       return caw.toCharArray();   }     private static void writeBytes(File file, byte[] data) throws IOException {     OutputStream fos = null;     OutputStream os = null;     try {       fos = new FileOutputStream(file);       os = new BufferedOutputStream(fos);       os.write(data);       } finally {       try {         if (os != null)           os.close();         if (fos != null)           fos.close();       } catch (Exception e) {         System.out.println(e);       }     }   }     private static void writeChars(File file, char[] data) throws IOException {     Writer fos = null;     Writer os = null;     try {       fos = new FileWriter(file);       os = new BufferedWriter(fos);       os.write(data);       } finally {       try {         if (os != null)           os.close();         if (fos != null)           fos.close();       } catch (Exception e) {         e.printStackTrace();       }     }   }   }  

package th;/** * 迅雷地址转普通地址 * <p>Title: ThunderSiteConverUtil</p> * <p>Description: </p> * <p>Company: www.itcast.com</p>  * @author 入云龙 * @date  2017年3月6日下午2:11:32 * @version 1.0 */public  class ThunderSiteConverUtil {   /**   * 迅雷thunder://地址与普通url地址转换    其实迅雷的thunder://地址就是将普通url地址加前缀‘AA'、后缀‘ZZ'，再base64编码后得到的字符串   * <p>Title: t1</p>   * <p>Description: </p>   * @param url   * @return   */    public String conver(String url){      String newUrl="";      //s＝s.substring(int begin，int end);截取s中从begin开始至end结束时的字符串，并将其赋值给s;      //去掉迅雷地址前缀      url=url.substring(10, url.length());      //解密      newUrl=Base64.decode(url);      //去掉头AA，尾ZZ      newUrl=newUrl.substring(2, newUrl.length()-2);      return newUrl;    }} 

package th;import org.junit.Test;/* * 迅雷地址转普通地址测试 */public class TestTh {     @Test  public void test1(){     String url="thunder://QUFodHRwOi8vdG9vbC5sdS90ZXN0LnppcFpa";     System.out.println("迅雷地址："+url);     url=new ThunderSiteConverUtil().conver(url);     System.out.println("普通地址："+url);  }}