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密码全是明文，防止内部人员监守自盗，改成暗文
密码加密 一般使用 MD5
加密特点：一旦加密之后 ，就不可解密
光是MD5加密 还不够安全 ，这时候就要添加盐值：
盐值作用：让你的密码更加安全，
MD5：支持加密次数
MD5加密三个概念： MD5常规加密，为了让你的密码更加安全，MD5加密还要加盐值，为了让你的密码超级安全，它支持加密次数
MD5Utils.encrypByMd5（String类型的密码）就执行加密
import java.security.MessageDigest; import java.security.
NoSuchAlgorithmException; public class MD5Utils { /** * 加密 * @param context */
public static String encrypByMd5(String context) { try { MessageDigest md =
MessageDigest.getInstance("MD5"); md.update(context.getBytes());//update处理 byte
[] encryContext = md.digest();//调用该方法完成计算 int i; StringBuffer buf = new
StringBuffer(""); for (int offset = 0; offset < encryContext.length; offset++) {
//做相应的转化（十六进制） i = encryContext[offset]; if (i < 0) i += 256; if (i < 16) buf.
append("0"); buf.append(Integer.toHexString(i)); } return buf.toString(); }
catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.
printStackTrace(); return null; } } public static void main(String[] args) {
//加密 System.out.println(MD5Utils.encrypByMd5("123456")); //加密加盐
查询用户时，除了查到加密密码外，还能查到颜值。 把输入密码+盐值加密和数据库存放密码比对就OK System.out.println(MD5Utils.
encrypByMd5("123456"+ StrUtils.getComplexRandomString(32))); System.out.println(
MD5Utils.encrypByMd5("123456"+ StrUtils.getComplexRandomString(32))); System.out
.println(MD5Utils.encrypByMd5("123456"+ StrUtils.getComplexRandomString(32))); }
}
