MD5加密实例
实例一：
加密工具类：
package com.cz.md5;import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class MD5Util {public static String getMD5Str(String str) { MessageDigest messageDigest = null; try { messageDigest = MessageDigest.getInstance("MD5"); messageDigest.reset(); messageDigest.update(str.getBytes("UTF-8")); } catch (NoSuchAlgorithmException e) { System.out.println("NoSuchAlgorithmException caught!"); System.exit(-1); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } 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(); }}
测试类：
package com.cz.md5;public class MD5Test {/** * @param args */public static void main(String[] args) {//设置需要加密的字符串String password="abc123456";MD5Util util = null;String MD5password=util.getMD5Str(password);System.out.println("加密后的MD5码："+MD5password);}}?
控制台输出：
加密后的MD5码：0659c7992e268962384eb17fafe88364
?
实例二（推荐）：
package com.cz.test;import java.security.MessageDigest;public class TestMD5 { /** * @param args */ public final static String MD5(String s) { char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; try { byte[] strTemp = s.getBytes(); MessageDigest mdTemp = MessageDigest.getInstance("MD5"); mdTemp.update(strTemp); byte[] md = mdTemp.digest(); int j = md.length; char str[] = new char[j * 2]; int k = 0; for (int i = 0; i < j; i++) { byte byte0 = md[i]; str[k++] = hexDigits[byte0 >>> 4 & 0xf]; str[k++] = hexDigits[byte0 & 0xf]; } return new String(str); } catch (Exception e) { return null; } } public static void main(String[] args) { // TODO Auto-generated method stub System.out.println(MD5("abc123456")); }}??
控制台输出：
0659c7992e268962384eb17fafe88364
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