加密算法

来源：互联网发布：甘肃网络电视台编辑：程序博客网时间：2024/05/16 11:41

import java.security.MessageDigest;
import org.apache.log4j.Logger;

public class EncoderByMd5 {

   /**日志记录对象*/
   private static final Logger logger = Logger.getLogger( EncoderByMd5.class );

   /**
   *
   * md5的加密算法
   *
   * @param str 要加密的字符串
   * @return 返回已经加密过的字符串
   *
   * @return String 返回已经加密过的字符串
   */
   public String encoderByMd5(String str){
       MessageDigest messageDigest = null;
        try {
            messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.reset();
            messageDigest.update(str.getBytes("UTF-8"));
        } catch (Exception e) {
           logger.error( "md5 error!", e );
        }

        byte[] byteArray = messageDigest.digest();
        StringBuffer md5StrBuff = new StringBuffer();

        for (int i = 0; i < byteArray.length; i++) {
            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
                md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
            else
                md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
        }

        return md5StrBuff.toString();
   }

   public static void main(String[] args) {
       EncoderByMd5 encoderByMd5 = new EncoderByMd5();
       String st = encoderByMd5.encoderByMd5("aaaaaa");
       System.out.println( st );
   }
}

简单的实现方法：

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Tset {

/**
* 将字符串通过MD5加密
* @param str
* @return
*/
public static String encodeStr(String str){

byte[] strByte = str.getBytes();

MessageDigest md = null;

try {
md = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}

md.update(strByte);

byte[] newByte = md.digest();

StringBuilder sb = new StringBuilder();

//转换为16进制
for (int i = 0; i < newByte.length; i++) {

if ((newByte[i] & 0xff) < 0x10) {
sb.append("0");
}
sb.append(Long.toString(newByte[i] & 0xff, 16));
}

return sb.toString();

}

/**
* 测试
* @param args
*/
public static void main(String[] args) {

System.out.println("abc after by MD5 encryption: "+Md5Tset.encodeStr("abc"));

}

}

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