java加密MD5实现及密码验证代码实例

package test;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.junit.Test;

public class Teste {
  @Test
  public void testMd5() {
    System.out.println(encrypt("1234567"));
  }
  
  @Test
  public void testlogin() {
    String password = encrypt("123456adfaf");
    if(encrypt("123456adfaf").equals(password)) {
      System.out.println("密码正确");
    } else {
      System.out.println("密码错误");
    }
  }
  
  private String encrypt(String password) {
    String passwordMd5 = null;
    try {
      MessageDigest md5 = MessageDigest.getInstance("MD5");
      byte[] bytes = md5.digest(password.getBytes("utf-8"));
      passwordMd5 = toHex(bytes);
    } catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
      e.printStackTrace();
    }
    return passwordMd5;
  }
  
  private static String toHex(byte[] bytes) {

    final char[] HEX_DIGITS = "0123456789ABCDEF".toCharArray();
    StringBuilder ret = new StringBuilder(bytes.length * 2);
    for (int i=0; i<bytes.length; i++) {
      ret.append(HEX_DIGITS[(bytes[i] >> 4) & 0x0f]);
      ret.append(HEX_DIGITS[bytes[i] & 0x0f]);
    }
    return ret.toString();
  }
}