JAVA通过md5方法进行加密

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/*
* MD5 算法
* 
*/
public class MD5 {

    // 全局数组
    private final static String[] strDigits = { "0", "1", "2", "3", "4", "5","6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

    public MD5() {
}

// 返回形式为数字跟字符串
private static String byteToArrayString(byte bByte) {
    int iRet = bByte;
    if (iRet < 0) {
        iRet += 256;
    }
    int iD1 = iRet / 16;
    int iD2 = iRet % 16;
    return strDigits[iD1] + strDigits[iD2];
}

// 返回形式只为数字
private static String byteToNum(byte bByte) {
    int iRet = bByte;
    if (iRet < 0) {
        iRet += 256;
    }
    return String.valueOf(iRet);
}

// 转换字节数组为16进制字串
private static String byteToString(byte[] bByte) {
    StringBuffer sBuffer = new StringBuffer();
    for (int i = 0; i < bByte.length; i++) {
        sBuffer.append(byteToArrayString(bByte[i]));
    }
    return sBuffer.toString();
}

public static String GetMD5Code(String strObj) {
    String resultString = null;
    try {
        resultString = new String(strObj);
        MessageDigest md = MessageDigest.getInstance("MD5");

        // md.digest() 该函数返回值为存放哈希值结果的byte数组
        resultString = byteToString(md.digest(strObj.getBytes()));
    } catch (NoSuchAlgorithmException ex) { 
        ex.printStackTrace();
    }
    return resultString;
}
}