MD5加密

package com.adtec.mq;

import java.security.MessageDigest;

public class md5Utils {

private String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D",
        "E", "F" };
public String md5Digest(String src) {
    try {
        return byteArrayToHexString(md5Digest(src.getBytes()));
    } catch (Exception e) {
        e.printStackTrace();
        return "";
    }
}
public byte[] md5Digest(byte[] src) throws Exception {
    MessageDigest alg = MessageDigest.getInstance("MD5");
    return alg.digest(src);
}
public String byteArrayToHexString(byte[] b) {
    StringBuffer result = new StringBuffer();
    for (int i = 0; i < b.length; i++) {
        result.append(byteToHexString(b[i]));
    }
    return result.toString();
}
private String byteToHexString(byte b) {
    int n = b;
    if (n < 0) n = 256 + n;
    int d1 = n / 16;
    int d2 = n % 16;
    return hexDigits[d1] + hexDigits[d2];
}

}