JAVA js的escape函数、解析用js encodeURI编码的字符串、utf8转gb2312的函数

	public static String escape(String src) {
		int i;
		int j;
		StringBuffer tmp = new StringBuffer();
		tmp.ensureCapacity(src.length() * 6);
		for (i = 0; i < src.length(); i++) {
			j = src.charAt(i);
			 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();
	}

String str="K.A%C3%A4%C2%B8%C2%B4%C3%A6%C2%97%C2%B6%C3%A4%C2%BE%C2%9B%C3%A5%C2%BA%C2%94%C3%A5%C2%95%C2%86";
			
//str=escape(java.net.URLDecoder.decode(str,"utf-8"));
//System.out.println(java.net.URLDecoder.decode(str,"utf-8"));
			
str= (java.net.URLDecoder.decode(str,"utf-8"));
System.out.println(utf8Togb2312(str));

	private static String utf8Togb2312(String str){
	      StringBuffer sb = new StringBuffer();
	      for(int i=0; i<str.length(); i++) {
	          char c = str.charAt(i);
	          switch (c) {
	             case ‘+‘:
	                 sb.append(‘ ‘);
	             break;
	             case ‘%‘:
	                 try {
	                      sb.append((char)Integer.parseInt(
	                      str.substring(i+1,i+3),16));
	                 }
	                 catch (NumberFormatException e) {
	                     throw new IllegalArgumentException();
	                }
	                i += 2;
	                break;
	             default:
	                sb.append(c);
	                break;
	           }
	      }
	      // Undo conversion to external encoding
	      String result = sb.toString();
	      String res=null;
	      try{
	          byte[] inputBytes = result.getBytes("8859_1");
	          res= new String(inputBytes,"UTF-8");
	      }
	      catch(Exception e){}
	      return res;
	}