java md532位小写加密

以下是两种Java实现MD5 32位小写加密的方法：

方式一：Java自身包实现

import java.math.BigInteger;
import java.security.MessageDigest;

public static String md5(String str) {
    byte[] secretBytes = null;
    try {
        secretBytes = MessageDigest.getInstance("md5").digest(str.getBytes());
    } catch (Exception 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;
}

方法二：apache提供的加密包commons-codec

import org.apache.commons.codec.digest.DigestUtils;

public static String md52(String plainText) {
    try {
        return DigestUtils.md5Hex(plainText.getBytes("UTF-8"));
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
        return null;
    }
}