JAVA MD5加密

// MD5加密
private static String md5sum(String unsignedStr) {
    try {
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        byte[] secretBytes = md5.digest(unsignedStr.getBytes());
        return bytesToHex(secretBytes);
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }

    return "";
}

// 二进制转为十六进制字符串
public static String bytesToHex(byte[] bytes) {
    StringBuilder md5str = new StringBuilder();
    // 把数组每一字节换成16进制连成md5字符串
    int digital;
    for (byte aByte : bytes) {
        digital = aByte;

        if (digital < 0) {
            digital += 256;
        }
        if (digital < 16) {
            md5str.append("0");
        }
        md5str.append(Integer.toHexString(digital));
    }
    return md5str.toString().toLowerCase();
}

使用方法如下：

md5sum("要加密的字符串");