Md5加密

首先工具类代码：StringUtil.java

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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

public class StringUtil {
    private final static Log log = LogFactory.getLog(StringUtil.class);
    private static MessageDigest digest = null;

    /**
     * 对字符串进行MD5加密
     * @param data
     * @return
     */
    public static String encode(String data) {
        if (digest == null)
            try {
                digest = MessageDigest.getInstance("MD5");
            } catch (NoSuchAlgorithmException nsae) {
                log.error("Failed to load the MD5 MessageDigest."
                        + " We will be unable to function normally.");
                nsae.printStackTrace();
            }
        digest.update(data.getBytes());
        return encodeHex(digest.digest());
    }

    private static String encodeHex(byte bytes[]) {
        StringBuffer buf = new StringBuffer(bytes.length * 2);
        for (int i = 0; i < bytes.length; i++) {
            if ((bytes[i] & 0xff) < 16)
                buf.append("0");
            buf.append(Long.toString(bytes[i] & 0xff, 16));
        }
        return buf.toString().toUpperCase();
    }
}

 

然后只需要调用encode方法传进去你想加密的字符串就可以了 例如：

String md5pwd=StringUtil.encode("123456");
System.out.println(md5pwd);

 

 

然后就是加盐加密算法。

代码如下：

public class PasswordEncode {
 private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
   "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
 private Object salt;//盐
 private String algorithm;//算法名
 
 public PasswordEncode(Object salt, String algorithm) {
  this.salt = salt;
  this.algorithm = algorithm;
 }

 public String encode(String rawPass) {   //加密加盐方法
  String result = null;//加密后的字符串
  try {
   MessageDigest md = MessageDigest.getInstance(algorithm);
   //加密后的字符串 
   result = byteArrayToHexString(md.digest(mergePasswordAndSalt(rawPass).getBytes("utf-8")));
  } catch (Exception ex) {
  }
  return result;
 }
 
    public boolean isPasswordValid(String encPass, String rawPass) {//判断加密后的密码 是否和给定的字符串相等
        String pass1 = "" + encPass;
        String pass2 = encode(rawPass);

        return pass1.equals(pass2);
    }
   
    private String mergePasswordAndSalt(String password) {//加盐算法
        if (password == null) {
            password = "";
        }

        if ((salt == null) || "".equals(salt)) {
            return password;
        } else {
            return password + "{" + salt.toString() + "}"; //在密码后追加盐
                    }
    }

 /**
  * 转换字节数组为16进制字串
  * @param b 字节数组
  * @return 16进制字串
  */
 private static String byteArrayToHexString(byte[] b) {
  StringBuffer resultSb = new StringBuffer();
  for (int i = 0; i < b.length; i++) {
   resultSb.append(byteToHexString(b[i]));
  }
  return resultSb.toString();
 }

 private static String byteToHexString(byte b) {
  int n = b;
  if (n < 0)
   n = 256 + n;
  int d1 = n / 16;
  int d2 = n % 16;
  return hexDigits[d1] + hexDigits[d2];
 }
   
    public static void main(String[] args) {
     String salt = "helloworld";
  PasswordEncoder encoderMd5 = new PasswordEncoder(salt, "MD5");
     String encode = encoderMd5.encode("test");//加盐加密
     System.out.println(encode);
     boolean passwordValid = encoderMd5.isPasswordValid("1bd98ed329aebc7b2f89424b5a38926e", "test");
     System.out.println(passwordValid);

     PasswordEncoder encoderSha = new PasswordEncoder(salt, "SHA");
     String pass2 = encoderSha.encode("test");
     System.out.println(pass2);
     boolean passwordValid2 = encoderSha.isPasswordValid("1bd98ed329aebc7b2f89424b5a38926e", "test");
     System.out.println(passwordValid2);
 }

}
直接可以使用