java md5加密字符

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这是一个实体类。使用的时候直接调用 GetMD5Code,byteToString,byteToNum,byteToArrayString

GetMD5Code(String str) 将str 进行md5 加密返回加密后的字符

byteToString(byte[] Byte ) 转换字节数组为16进制字串

byteToNum 返回形式只为数字

byteToArrayString 返回形式为数字跟字符串

package com.gxa.entity;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class MD5 {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;    // System.out.println("iRet="+iRet);    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;    System.out.println("iRet1=" + iRet);    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;}}

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