MD5工具

1. MD5Util.java

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.security.MessageDigest;

public class MD5Util {
    private static Logger LOG = LoggerFactory.getLogger(MD5Util.class);

    public static String MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++) {
            byteArray[i] = (byte) charArray[i];
        }
        byte[] md5Bytes = md5.digest(byteArray);

        StringBuffer hexValue = new StringBuffer();

        for (int i = 0; i < md5Bytes.length; i++) {
            int val = md5Bytes[i] & 0xFF;
            if (val < 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();
    }

}

---

2. MD5Util.java

import java.security.MessageDigest;

/**
 * MD5加密工具类
 */
public class MD5Util {

    private MD5Util(){}

    public static String encrypt(String input) {
        String result = "";
        char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
        try {
            byte[] strTemp = input.getBytes("utf-8");
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(strTemp);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte b = md[i];
                str[k++] = hexDigits[b >> 4 & 0xf];
                str[k++] = hexDigits[b & 0xf];
            }
            result = new String(str);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

}

3 . md5方法

static String md5(String text) {
        byte[] bts;
        try {
            bts = text.getBytes("UTF-8");
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] bts_hash = md.digest(bts);
            StringBuffer buf = new StringBuffer();
            for (byte b : bts_hash) {
                buf.append(String.format("%02X", b & 0xff));
            }
            return buf.toString();
        } catch (java.io.UnsupportedEncodingException e) {
            e.printStackTrace();
            return "";
        } catch (java.security.NoSuchAlgorithmException e) {
            e.printStackTrace();
            return "";
        }
    }

---md5-->不区分大小写的。