MD5 도구 방법 사용

더 읽 기

package com.cdl.test;

import java.security.MessageDigest;
import java.util.Arrays;

/**
 *   ：  MessageDigest MD5

 *   ：http://apps.hi.baidu.com/share/detail/20189800

 * http://zhidao.baidu.com/question/163063912.html

 * @author [email protected]

 * @date 2011-12-7

 * @version 1.0 

 * 
 */
public class TestMD5 {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		String md5 = getMD5Mask("cdl");
		System.out.println(md5);
		/**
		 *     ：

		 * [11, 29, -82, -22, -37, -62, 17, 60, -93, 96, 38, 93, -58, 0, -91,14]

		 * 0b 1d ae ea db c2 11 3c a3 60 26 5d c6 00 a5 0e
		 * */

	}

	/**
	 * 1. byte(8    )       -128-127, char(16    )      0-65535;

	 * 2.    byte                0  ，  MD5 32  ，       

	 * 3.0x        ，  ：0xFF  8     1111 1111;0x00FF  16     0000 0000 1111 1111
	 * */
	public static String getMD5Mask(String str) throws Exception {
		MessageDigest messageDigest = null;

		//       
		messageDigest = MessageDigest.getInstance("MD5");

		//      
		messageDigest.reset();

		//         
		messageDigest.update(str.getBytes("UTF-8"));

		//              
		byte[] byteArray = messageDigest.digest();

		System.out.println(Arrays.toString(byteArray));

		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();
	}
}

byte 바 이 너 리 보기 기능 추가

package com.cdl.test;

import java.security.MessageDigest;
import java.util.Arrays;

/**
 *   ：  MessageDigest MD5

 *   ：http://apps.hi.baidu.com/share/detail/20189800
 * 
 * @author [email protected]

 * @date 2011-12-7

 * @version 1.0 

 * 
 */
public class TestMD5 {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		String md5 = getMD5Mask("cdl");
		System.out.println(md5);
		/**
		 *     ：

		 * [11, 29, -82, -22, -37, -62, 17, 60, -93, 96, 38, 93, -58, 0, -91,14]

		 * 0b 1d ae ea db c2 11 3c a3 60 26 5d c6 00 a5 0e
		 * */

	}

	/**
	 *   ：http://zhidao.baidu.com/question/163063912.html

	 * 1. byte(8    )       -128-127, char(16    )      0-65535,

	 *     & 0xFF   byte         ;

	 * 2.    byte                0  ，  MD5 32  ，       

	 * 3.0x        ，  ：0xFF  8     1111 1111;0x00FF  16     0000 0000 1111 1111
	 * */
	public static String getMD5Mask(String str) throws Exception {
		MessageDigest messageDigest = null;

		//       
		messageDigest = MessageDigest.getInstance("MD5");

		//      
		messageDigest.reset();

		//         
		messageDigest.update(str.getBytes("UTF-8"));

		//              
		byte[] byteArray = messageDigest.digest();

		System.out.println(Arrays.toString(byteArray));

		StringBuffer md5StrBuff = new StringBuffer();

		String bitArray = null;
		for (int i = 0; i < byteArray.length; i++) {
			bitArray = Integer.toBinaryString(byteArray[i]);

			if (bitArray.length() > 8) {
				System.out.println(bitArray.substring(24));
			} else
				System.out.println(bitArray);

			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();
	}
}

출력:

[11, 29, -82, -22, -37, -62, 17, 60, -93, 96, 38, 93, -58, 0, -91, 14]
1011
11101
10101110
11101010
11011011
11000010
10001
111100
10100011
1100000
100110
1011101
11000110
0
10100101
1110
0b1daeeadbc2113ca360265dc600a50e

.

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