java 数据库表加密 java数据库密码加密

importjava.security.MessageDigest;

 



publicclassPassword {
    
    //十六进制下数字到字符的映射数组
   privatefinalstaticString[] hexDigits ={"0", "1", "2", "3", "4",
        "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};
    
    
    publicstaticString createPassword(String inputString){
        returnencodeByMD5(inputString);
    }
    
    
    publicstaticbooleanauthenticatePassword(String password, String inputString) {
        if(password.equals(encodeByMD5(inputString))) {
            returntrue;
        }else{
            returnfalse;
        }
    }
    
    
    privatestaticString encodeByMD5(String originString) {
        if(originString !=null) {
            try{
                //创建具有指定算法名称的信息摘要
               MessageDigest md =MessageDigest.getInstance("MD5");
                //使用指定的字节数组对摘要进行最后更新，然后完成摘要计算
               byte[] results =md.digest(originString.getBytes());
                //将得到的字节数组变成字符串返回
               String resultString =byteArrayToHexString(results);
                returnresultString.toUpperCase();
            }catch(Exception ex) {
                ex.printStackTrace();
            }
        }
        returnnull;
    }
    
    
    privatestaticString byteArrayToHexString(byte[] b) {
        StringBuffer resultSb =newStringBuffer();
        for(inti =0; i <</span>b.length; i++) {
            resultSb.append(byteToHexString(b[i]));
        }
        returnresultSb.toString();
    }
    
    
    privatestaticString byteToHexString(byteb) {
        intn =b;
        if(n <</span>0)
            n =256+n;
        intd1 =n /16;
        intd2 =n %16;
        returnhexDigits[d1] +hexDigits[d2];
    }
    
    publicstaticvoidmain(String[] args) {
        String password =Password.createPassword("888888");
        System.out.println("对888888用MD5摘要后的字符串："+password);
        String inputString ="8888";
        System.out.println("8888与密码匹配？"+
                Password.authenticatePassword(password, inputString));
        inputString ="888888";
        System.out.println("888888与密码匹配？"+
                Password.authenticatePassword(password, inputString));
    }

}  

 

 
输出结果：
  对123456用MD5摘要后的字符串：E10ADC3949BA59ABBE56E057F20F883E
  

   1234与密码匹配？false 
 
  

   123456与密码匹配？true