web乱码

public class EncodingHelperImpl implements EncodingHelper {

	/**
	 * js unescape
	 * 
	 * @param str
	 * @return
	 */
	public String StringToUnicode(String str) throws Exception {
		String tmp;
		StringBuffer sb = new StringBuffer(1000);
		char c;
		int i, j;
		sb.setLength(0);
		for (i = 0; i < str.length(); i++) {
			c = str.charAt(i);
			if (c > 255) {
				sb.append("%u");
				j = (c >>> 8);
				tmp = Integer.toHexString(j);
				if (tmp.length() == 1)
					sb.append("0");
				sb.append(tmp);
				j = (c & 0xFF);
				tmp = Integer.toHexString(j);
				if (tmp.length() == 1)
					sb.append("0");
				sb.append(tmp);
			} else {
				sb.append(c);
			}

		}
		return (new String(sb));
	}

	/**
	 * js escape
	 * 
	 * @param str
	 * @return
	 */
	public String UnicodeToString(String str) throws Exception {
		Pattern pattern = Pattern.compile("(\\\\u(\\p{XDigit}{4}))");
		Matcher matcher = pattern.matcher(str);
		char ch;
		while (matcher.find()) {
			ch = (char) Integer.parseInt(matcher.group(2), 16);
			str = str.replace(matcher.group(1), ch + "");
		}
		return str;
	}

	/**
	 * encodeURIComponent
	 * 
	 * @param param
	 * @return
	 */
	public String decode(String param) throws Exception {
		try {
			String decode = java.net.URLDecoder.decode(param, "utf-8");
			return decode;
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return param;
	}

	/**
	 * decodeURIComponent
	 * 
	 * @param param
	 * @return
	 */
	public String encode(String param) throws Exception {
		try {
			String decode = java.net.URLEncoder.encode(param, "utf-8");
			return decode;
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return param;
	}

}