Java로 구현한 JavaScript의 escape()와 unescape()

출처:

http://hi.baidu.com/ljzcome/blog/item/96bfa35801a60689800a183b.html

 

public class EscapeUnescape

{  

     public static String escape(String src)

     {   
          int i;   
          char j;   
          StringBuffer tmp = new StringBuffer();   
          tmp.ensureCapacity(src.length() * 6);   

          for (i = 0; i < src.length(); i++)

         {   
            j = src.charAt(i);   
            if (Character.isDigit(j) || Character.isLowerCase(j) || Character.isUpperCase(j))   
                tmp.append(j);   
            else if (j < 256)

            {   
                tmp.append("%");   
                if (j < 16)   
                    tmp.append("0");   
                    tmp.append(Integer.toString(j, 16));   
            }

            else

            {   
                tmp.append("%u");   
                tmp.append(Integer.toString(j, 16));   
           }   
      }   

      return tmp.toString();  
 }  

 

 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();  
 }  

  

 public static void main(String[] args)

 {   
      String tmp = "中文";   
      System.out.println("testing escape : " + tmp);   
      tmp = escape(tmp);   
      System.out.println(tmp);   
      System.out.println("testing unescape :" + tmp);   
      System.out.println(unescape("%u4e2d%u6587"));  
 }  

}