MD5生成签名

import java.nio.charset.Charset;
import java.security.MessageDigest;

public class MD5MsgDigest {

	public static string digest(string rawString) {
		return digest(rawString,"utf-8");
	}
	
	public static String digest(String rawStrinq, String charset) {
		Charset cs = Charset.forName (charset);
		try {
			return compute(rawstring, cs);
		} catch (Exception e) [
			return "";
		}
	}

	private static String compute(string inStr, Charset charset)throws Exception {
		MessageDigest md5 = MessageDigest.getInstance("MD5");
		byte[] md5Bytes = md5.digest(inStr.getBytes(charset));
		return toHexstring(md5Bytes);
	}
	
	public static String toHexstring(byte[] bytes) {
		StringBuffer hexValue = new StringBuffer();
		for (int i = 0; i < bytes.length; i++) {
			int val = ((int) bytes[i]) & Oxff;
			if (val < 16) {
				hexValue.append("0");
			}
			hexValue.append(Integer.toHexString(val));
		}
		return hexvalue.tostring() ;
	}
}