Java md5加密

Java提供了自带的jar工具类MessageDigest来实现MD5加密算法。你可以使用以下代码来将字符串转换成MD5摘要值：

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;
    }
}

使用示例：

@Test
public void testMd5() throws NoSuchAlgorithmException{
    MessageDigest md = MessageDigest.getInstance("MD5");
    String resultString = MD5Utils.stringToMD5("123456");
    System.out.println(resultString); // 输出：e10adc3949ba59abbe56e057f20f883e
}

这样你就可以得到字符串"123456"的MD5加密结果"e10adc3949ba59abbe56e057f20f883e"。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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