原理分析：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
实现：
步骤1，添加工具类Base64 编码和解码：Base64.java
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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(); } } } } |
步骤2,编写迅雷地址转普通地址的类及方法：ThunderSiteConverUtil.java
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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; }} |
步骤3，建立测试类：TestTh.java
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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); }} |
运行Junit测试test1，控制台输出：
迅雷地址：thunder://QUFodHRwOi8vdG9vbC5sdS90ZXN0LnppcFpa
普通地址：http://tool.lu/test.zip
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/zy2009/p/6517612.html
