1 加密方法：
1.1 java自带jar工具MessageDigest实现
java.security.MessageDigest
public class MD5Utils { public static String stringToMD5(String plainText) { byte[] secretBytes = null; try { secretBytes = MessageDigest.getInstance("md5").digest( plainText.getBytes()); } catch (NoSuchAlgorithmException e) { throw new RuntimeException("没有这个md5算法！"); } String md5code = new BigInteger(1, secretBytes).toString(16); for (int i = 0; i < 32 - md5code.length(); i++) { md5code = "0" + md5code; } return md5code; } }
1.2 spring自带的工具DigestUtils实现
org.springframework.util.DigestUtils
DigestUtils.md5DigestAsHex("1234".getBytes())- 1
2 使用方法：
@Test
public void testMd5() throws NoSuchAlgorithmException{ MessageDigest md = MessageDigest.getInstance("MD5"); // java自带工具包MessageDigest String resultString = MD5Utils.md5("123456"); System.out.println(resultString); // e10adc3949ba59abbe56e057f20f883e String resultString1 = MD5Utils.md5("1234"); System.out.println(resultString1); //81dc9bdb52d04dc20036dbd8313ed055 // spring自带工具包DigestUtils System.out.println(DigestUtils.md5DigestAsHex("1234".getBytes())); // 81dc9bdb52d04dc20036dbd8313ed055 }