测试MD5 加密
CREATE TABLE `testmd5`( `id` INT(4) NOT NULL, `name` VARCHAR(20) NOT NULL, `pwd` VARCHAR(50) NOT NULL, PRIMARY KEY(`id`) )ENGINE=INNODB DEFAULT CHARSET=utf8 -- 明文密码 INSERT INTO testmd5 VALUES(1,'zhangsan','123456'),(2,'lisi','123456'),(3,'wangwu','123456') -- 加密 UPDATE testmd5 SET pwd=MD5(pwd) WHERE id = 1 UPDATE testmd5 SET pwd=MD5(pwd) -- 加密全部的密码 -- 插入的时候加密 INSERT INTO testmd5 VALUES(4,'xiaoming',MD5('123456')) -- 如何校验：将用户传递进来的密码，进行md5加密，然后比对加密后的值 SELECT * FROM testmd5 WHERE `name`='xiaoming' AND pwd=MD5('123456')
import java.security.MessageDigest; public class MD5Util { /*** * MD5加码 生成32位md5码 */ public static String string2MD5(String inStr){ MessageDigest md5 = null; try{ md5 = MessageDigest.getInstance("MD5"); }catch (Exception e){ System.out.println(e.toString()); e.printStackTrace(); return ""; } char[] charArray = inStr.toCharArray(); byte[] byteArray = new byte[charArray.length]; for (int i = 0; i < charArray.length; i++) byteArray[i] = (byte) charArray[i]; byte[] md5Bytes = md5.digest(byteArray); StringBuffer hexValue = new StringBuffer(); for (int i = 0; i < md5Bytes.length; i++){ int val = ((int) md5Bytes[i]) & 0xff; if (val < 16) hexValue.append("0"); hexValue.append(Integer.toHexString(val)); } return hexValue.toString(); } /** * 加密解密算法 执行一次加密，两次解密 */ public static String convertMD5(String inStr){ char[] a = inStr.toCharArray(); for (int i = 0; i < a.length; i++){ a[i] = (char) (a[i] ^ 't'); } String s = new String(a); return s; } // 测试主函数 public static void main(String args[]) { String s = new String("tangfuqiang"); System.out.println("原始：" + s); System.out.println("MD5后：" + string2MD5(s)); System.out.println("加密的：" + convertMD5(s)); System.out.println("解密的：" + convertMD5(convertMD5(s))); } }
