java对应javascript的escape,unescape进行解码

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/**
* 加码解码工具
* @author lwm
*
*/

public class Encode {

/*
* 对应javascript的escape()函数, 加码后的串可直接使用javascript的unescape()进行解码
*/
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();
}

/*
* 对应javascript的unescape()函数, 可对javascript的escape()进行解码
*/
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();
}

}