java实现对url解析

雨点打透心脏的1/2处 2022-08-07 05:40 326阅读 0赞

/\*\*  
   \* 对经过escape函数加密的url中的字符串进行解密  
   \* @return 解密后的正常字符串  
   \* @param src  
   \* 参数说明 例如：%u5339%u914D%u8BBE%u5907或者/u5339/u914D/u8BBE/u5907  
   \*/  
    public static String unescape(String src) \{  
         StringBuffer tmp = new StringBuffer();  
         tmp.ensureCapacity(src.length());  
         int lastPos = 0, pos = 0;  
         char ch;  
         while (lastPos < src.length()) \{  
            pos = src.indexOf("%", lastPos);  
            if (pos == lastPos) \{  
               if (src.charAt(pos + 1) == 'u') \{  
                  ch = (char) Integer.parseInt(src.substring(pos + 2, pos + 6), 16);  
                  tmp.append(ch);  
                  lastPos = pos + 6;  
               \}  
               else \{  
                  ch = (char) Integer.parseInt(src.substring(pos + 1, pos + 3), 16);  
                  tmp.append(ch);  
                  lastPos = pos + 3;  
               \}  
            \}  
            else \{  
               if (pos == -1) \{  
                  tmp.append(src.substring(lastPos));  
                  lastPos = src.length();  
               \}  
               else \{  
                  tmp.append(src.substring(lastPos, pos));  
                  lastPos = pos;  
               \}  
            \}  
         \}  
         return tmp.toString();  
      \}