2014-02-09 98 views

回答

3

我试过使用org.apache.commons.codec.binary.Base64(ctor接受一个参数,说明编码/解码是否是网址安全的),但事实证明它没有像UrlTokenEncode/Decode一样实现。

我结束了迁移C#实现对Java:

public static byte[] UrlTokenDecode(String input) { 
    if (input == null) 
     return new byte[0]; 

    int len = input.length(); 
    if (len < 1) 
     return new byte[0]; 

    /////////////////////////////////////////////////////////////////// 
    // Step 1: Calculate the number of padding chars to append to this string. 
    //   The number of padding chars to append is stored in the last char of the string. 
    int numPadChars = (int)input.charAt(len - 1) - (int)'0'; 
     if (numPadChars < 0 || numPadChars > 10) 
      return null; 


    /////////////////////////////////////////////////////////////////// 
    // Step 2: Create array to store the chars (not including the last char) 
    //   and the padding chars 
    char[] base64Chars = new char[len - 1 + numPadChars]; 


    //////////////////////////////////////////////////////// 
    // Step 3: Copy in the chars. Transform the "-" to "+", and "*" to "/" 
    for (int iter = 0; iter < len - 1; iter++) { 
     char c = input.charAt(iter); 

     switch (c) { 
      case '-': 
       base64Chars[iter] = '+'; 
        break; 

       case '_': 
       base64Chars[iter] = '/'; 
       break; 

      default: 
       base64Chars[iter] = c; 
       break; 
     } 
    } 

    //////////////////////////////////////////////////////// 
    // Step 4: Add padding chars 
    for (int iter = len - 1; iter < base64Chars.length; iter++) { 
     base64Chars[iter] = '='; 
    } 

    // Do the actual conversion 
    String assembledString = String.copyValueOf(base64Chars); 
    return Base64.decodeBase64(assembledString); 
} 
+0

你能不能也发表您的编码方法(Java)的?谢谢 – ori888

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