类似JavaScript中的escape() 和unescape() 转码方法 

package my.tools;    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();      }        /**        * @disc 对字符串重新编码        * @param src        * @return         */      public static String isoToGB(String src) {          String strRet = null;          try {              strRet = new String(src.getBytes("ISO_8859_1"), "GB2312");          } catch (Exception e) {            }          return strRet;      }        /**        * @disc 对字符串重新编码        * @param src        * @return         */      public static String isoToUTF(String src) {          String strRet = null;          try {              strRet = new String(src.getBytes("ISO_8859_1"), "UTF-8");          } catch (Exception e) {            }          return strRet;      }        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("%u6211%u4eec"));          System.out.println(isoToUTF(tmp));      }  }