Spring Cloud -- 常用工具类和公共类整理

1.Md5Util 和Base64Util

package com.id0304.utils;

import java.security.MessageDigest;

/**
 * Created by codermen on 2017/10/26.
 */
public class Md5Util {

    //生成MD5
    public static String getMD5(String message) {
        String md5 = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");  // 创建一个md5算法对象
            byte[] messageByte = message.getBytes("UTF-8");
            byte[] md5Byte = md.digest(messageByte);              // 获得MD5字节数组,16*8=128位
            md5 = bytesToHex(md5Byte);                            // 转换为16进制字符串
        } catch (Exception e) {
            e.printStackTrace();
        }
        return md5;
    }

    // 二进制转十六进制
    public static String bytesToHex(byte[] bytes) {
        StringBuffer hexStr = new StringBuffer();
        int num;
        for (int i = 0; i < bytes.length; i++) {
            num = bytes[i];
            if (num < 0) {
                num += 256;
            }
            if (num < 16) {
                hexStr.append("0");
            }
            hexStr.append(Integer.toHexString(num));
        }
        return hexStr.toString().toUpperCase();
    }
}

package com.id0304.utils;

import java.io.*;

public final class Base64Util
{
    private static final int BASELENGTH = 255;

    private static final int LOOKUPLENGTH = 64;

    private static final int TWENTYFOURBITGROUP = 24;

    private static final int EIGHTBIT = 8;

    private static final int SIXTEENBIT = 16;

    // private static final int SIXBIT = 6;
    private static final int FOURBYTE = 4;

    // private static final int TWOBYTE = 2;
    private static final int SIGN = -128;

    private static final byte PAD = (byte) '=';

    private static byte[] base64Alphabet = new byte[BASELENGTH];

    private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];

    static
    {
        for (int i = 0; i < BASELENGTH; i++)
        {
            base64Alphabet[i] = -1;
        }
        for (int i = 'Z'; i >= 'A'; i--)
        {
            base64Alphabet[i] = (byte) (i - 'A');
        }
        for (int i = 'z'; i >= 'a'; i--)
        {
            base64Alphabet[i] = (byte) (i - 'a' + 26);
        }
        for (int i = '9'; i >= '0'; i--)
        {
            base64Alphabet[i] = (byte) (i - '0' + 52);
        }

        base64Alphabet['+'] = 62;
        base64Alphabet['/'] = 63;

        for (int i = 0; i <= 25; i++)
        {
            lookUpBase64Alphabet[i] = (byte) ('A' + i);
        }

        for (int i = 26, j = 0; i <= 51; i++, j++)
        {
            lookUpBase64Alphabet[i] = (byte) ('a' + j);
        }

        for (int i = 52, j = 0; i <= 61; i++, j++)
        {
            lookUpBase64Alphabet[i] = (byte) ('0' + j);
        }

        lookUpBase64Alphabet[62] = (byte) '+';
        lookUpBase64Alphabet[63] = (byte) '/';
    }

    public static boolean isBase64(String isValidString)
    {
        return isArrayByteBase64(isValidString.getBytes());
    }

    public static boolean isBase64(byte octect)
    {
        // shall we ignore white space? JEFF??
        return (octect == PAD || base64Alphabet[octect] != -1);
    }

    public static boolean isArrayByteBase64(byte[] arrayOctect)
    {
        int length = arrayOctect.length;
        if (length == 0)
        {
            // shouldn't a 0 length array be valid base64 data?
            // return false;
            return true;
        }
        for (int i = 0; i < length; i++)
        {
            if (!isBase64(arrayOctect[i]))
            {
                return false;
            }
        }
        return true;
    }

    /**
     * Encode String object;
     *
     * @param src String object to be encoded.
     * @return encoded String;
     */
    public static String encodeString(String src)
    {
        return encode(src);
    }

    public static String encodeBytes(byte[] src)
    {
        if (src == null || src.length == 0) {
            return null;
        }
        byte[] bytes = encode(src);
        return new String(bytes);
    }

    /**
     * Encode String object;
     *
     * @param src String object to be encoded.
     * @return encoded String;
     */
    public static String encode(String src)
    {
        String target = null;
        if (src != null)
        {
            byte[] bts1 = src.getBytes();
            byte[] bts2 = encode(bts1);
            if (bts2 != null)
            {
                target = new String(bts2);
            }
        }
        return target;
    }

    /**
     * Encodes hex octects into Base64.
     *
     * @param binaryData Array containing binary data to encode.
     * @return Base64-encoded data.
     */
    public static byte[] encode(byte[] binaryData)
    {
        int lengthDataBits = binaryData.length * EIGHTBIT;
        int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
        int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
        byte encodedData[] = null;

        if (fewerThan24bits != 0)
        {
            // data not divisible by 24 bit
            encodedData = new byte[(numberTriplets + 1) * 4];
        }
        else
        {
            // 16 or 8 bit
            encodedData = new byte[numberTriplets * 4];
        }

        byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;

        int encodedIndex = 0;
        int dataIndex = 0;
        int i = 0;
        for (i = 0; i < numberTriplets; i++)
        {
            dataIndex = i * 3;
            b1 = binaryData[dataIndex];
            b2 = binaryData[dataIndex + 1];
            b3 = binaryData[dataIndex + 2];

            l = (byte) (b2 & 0x0f);
            k = (byte) (b1 & 0x03);

            encodedIndex = i * 4;
            byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
            byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
            byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);

            encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
            encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k << 4)];
            encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l << 2) | val3];
            encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];
        }

        // form integral number of 6-bit groups
        dataIndex = i * 3;
        encodedIndex = i * 4;
        if (fewerThan24bits == EIGHTBIT)
        {
            b1 = binaryData[dataIndex];
            k = (byte) (b1 & 0x03);
            byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
            encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
            encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];
            encodedData[encodedIndex + 2] = PAD;
            encodedData[encodedIndex + 3] = PAD;
        }
        else if (fewerThan24bits == SIXTEENBIT)
        {

            b1 = binaryData[dataIndex];
            b2 = binaryData[dataIndex + 1];
            l = (byte) (b2 & 0x0f);
            k = (byte) (b1 & 0x03);

            byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
            byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);

            encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
            encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k << 4)];
            encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];
            encodedData[encodedIndex + 3] = PAD;
        }

        return encodedData;
    }

    public static String decode(String src)
    {
        String target = null;
        if (src != null)
        {
            byte[] bts1 = src.getBytes();
            byte[] bts2 = decode(bts1);
            if (bts2 != null)
            {
                target = new String(bts2);
            }
        }
        return target;
    }

    public static String decode(String src, String charSet) throws UnsupportedEncodingException
    {
        String target = null;
        if (src != null)
        {
            byte[] bts1 = src.getBytes();
            byte[] bts2 = decode(bts1);
            if (bts2 != null)
            {
                target = new String(bts2, charSet);
            }
        }
        return target;
    }

    /**
     * Decodes Base64 data into octects
     *
     * @param base64Data Byte array containing Base64 data
     * @return Array containing decoded data.
     */
    public static byte[] decode(byte[] base64Data)
    {
        // handle the edge case, so we don't have to worry about it later
        if (base64Data.length == 0)
        {
            return null;
        }

        int numberQuadruple = base64Data.length / FOURBYTE;
        byte decodedData[] = null;
        byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;

        // Throw away anything not in base64Data

        int encodedIndex = 0;
        int dataIndex = 0;
        {
            // this sizes the output array properly - rlw
            int lastData = base64Data.length;
            // ignore the '=' padding
            while (base64Data[lastData - 1] == PAD)
            {
                if (--lastData == 0)
                {
                    return new byte[0];
                }
            }
            decodedData = new byte[lastData - numberQuadruple];
        }

        for (int i = 0; i < numberQuadruple; i++)
        {
            dataIndex = i * 4;
            marker0 = base64Data[dataIndex + 2];
            marker1 = base64Data[dataIndex + 3];

            b1 = base64Alphabet[base64Data[dataIndex]];
            b2 = base64Alphabet[base64Data[dataIndex + 1]];

            if (marker0 != PAD && marker1 != PAD)
            {
                // No PAD e.g 3cQl
                b3 = base64Alphabet[marker0];
                b4 = base64Alphabet[marker1];

                decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
                decodedData[encodedIndex + 1] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
                decodedData[encodedIndex + 2] = (byte) (b3 << 6 | b4);
            }
            else if (marker0 == PAD)
            {
                // Two PAD e.g. 3c[Pad][Pad]
                decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
            }
            else if (marker1 == PAD)
            {
                // One PAD e.g. 3cQ[Pad]
                b3 = base64Alphabet[marker0];

                decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
                decodedData[encodedIndex + 1] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
            }
            encodedIndex += 3;
        }
        return decodedData;
    }

    /**
     * 隐藏工具类的构造方法
     */
    protected Base64Util()
    {
        throw new UnsupportedOperationException();
    }

    /**
     * 文件读取缓冲区大小
     */
    private static final int CACHE_SIZE = 1024;

    /** *//**
 * 

 * BASE64字符串解码为二进制数据
 * 
 *
 * @param base64
 * @return
 * @throws Exception
 */
public static byte[] decodeString(String base64) throws Exception {
    return Base64Util.decode(base64.getBytes());
}

    /** *//**
 * 

 * 二进制数据编码为BASE64字符串
 * 
 *
 * @param bytes
 * @return
 * @throws Exception
 */
public static String encodeByte(byte[] bytes) throws Exception {
    return new String(Base64Util.encode(bytes));
}

    /** *//**
 * 

 * 将文件编码为BASE64字符串
 * 
 * 

 * 大文件慎用，可能会导致内存溢出
 * 
 *
 * @param filePath 文件绝对路径
 * @return
 * @throws Exception
 */
public static String encodeFile(String filePath) throws Exception {
    byte[] bytes = fileToByte(filePath);
    return encodeByte(bytes);
}

    /** *//**
 * 

 * BASE64字符串转回文件
 * 
 *
 * @param filePath 文件绝对路径
 * @param base64 编码字符串
 * @throws Exception
 */
public static void decodeToFile(String filePath, String base64) throws Exception {
    byte[] bytes = decodeString(base64);
    byteArrayToFile(bytes, filePath);
}

    /** *//**
 * 

 * 文件转换为二进制数组
 * 
 *
 * @param filePath 文件路径
 * @return
 * @throws Exception
 */
public static byte[] fileToByte(String filePath) throws Exception {
    byte[] data = new byte[0];
    File file = new File(filePath);
    if (file.exists()) {
        FileInputStream in = new FileInputStream(file);
        ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
        byte[] cache = new byte[CACHE_SIZE];
        int nRead = 0;
        while ((nRead = in.read(cache)) != -1) {
            out.write(cache, 0, nRead);
            out.flush();
        }
        out.close();
        in.close();
        data = out.toByteArray();
    }
    return data;
}

    /** *//**
 * 

 * 二进制数据写文件
 * 
 *
 * @param bytes 二进制数据
 * @param filePath 文件生成目录
 */
public static void byteArrayToFile(byte[] bytes, String filePath) throws Exception {
    InputStream in = new ByteArrayInputStream(bytes);
    File destFile = new File(filePath);
    if (!destFile.getParentFile().exists()) {
        destFile.getParentFile().mkdirs();
    }
    destFile.createNewFile();
    OutputStream out = new FileOutputStream(destFile);
    byte[] cache = new byte[CACHE_SIZE];
    int nRead = 0;
    while ((nRead = in.read(cache)) != -1) {
        out.write(cache, 0, nRead);
        out.flush();
    }
    out.close();
    in.close();
}

}

2.CookieUtil:

package com.id0304.utils;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Cookie工具类
 *
 */
public class CookieUtil {

    private CookieUtil() {
    }

    /**
     * 添加cookie
     *
     * @param response
     * @param name
     * @param value
     * @param maxAge
     */
    public static void addCookie(HttpServletResponse response, String name, String value, int maxAge) {
        Cookie cookie = new Cookie(name, value);
        cookie.setPath("/");
        if (maxAge > 0) {
            cookie.setMaxAge(maxAge);
        }
        response.addCookie(cookie);
    }

    /**
     * 删除cookie
     *
     * @param response
     * @param name
     */
    public static void removeCookie(HttpServletResponse response, String name) {
        Cookie uid = new Cookie(name, null);
        uid.setPath("/");
        uid.setMaxAge(0);
        response.addCookie(uid);
    }

    /**
     * 获取cookie值
     *
     * @param request
     * @return
     */
    public static String getUid(HttpServletRequest request,String cookieName) {
        Cookie cookies[] = request.getCookies();
        for (Cookie cookie : cookies) {
            if (cookie.getName().equals(cookieName)) {
                return cookie.getValue();
            }
        }
        return null;
    }
}

3.DateUtils,注意需要引入org.apache.commons.lang.time.DateFormatUtils这个包:

package com.id0304.utils;

import org.apache.commons.lang.time.DateFormatUtils;

import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtils extends org.apache.commons.lang3.time.DateUtils {

    private static String[] parsePatterns = { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM",
            "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm", "yyyy/MM", "yyyy.MM.dd", "yyyy.MM.dd HH:mm:ss",
            "yyyy.MM.dd HH:mm", "yyyy.MM" };

    /**
     * 得到当前日期字符串 格式（yyyy-MM-dd）
     */
    public static String getDate() {
        return getDate("yyyy-MM-dd HH:mm:ss");
    }

    /**
     * 得到当前日期字符串 格式（yyyy-MM-dd） pattern可以为："yyyy-MM-dd" "HH:mm:ss" "E"
     */
    public static String getDate(String pattern) {
        return DateFormatUtils.format(new Date(), pattern);
    }

    /**
     * 得到日期字符串 默认格式（yyyy-MM-dd） pattern可以为："yyyy-MM-dd" "HH:mm:ss" "E"
     */
    public static String formatDate(Date date, Object... pattern) {
        if (date == null) {
            return null;
        }
        String formatDate = null;
        if (pattern != null && pattern.length > 0) {
            formatDate = DateFormatUtils.format(date, pattern[0].toString());
        } else {
            formatDate = DateFormatUtils.format(date, "yyyy-MM-dd");
        }
        return formatDate;
    }

    /**
     * 得到日期时间字符串，转换格式（yyyy-MM-dd HH:mm:ss）
     */
    public static String formatDateTime(Date date) {
        return formatDate(date, "yyyy-MM-dd HH:mm:ss");
    }

    /**
     * 得到当前时间字符串 格式（HH:mm:ss）
     */
    public static String getTime() {
        return formatDate(new Date(), "HH:mm:ss");
    }

    /**
     * 得到当前日期和时间字符串 格式（yyyy-MM-dd HH:mm:ss）
     */
    public static String getDateTime() {
        return formatDate(new Date(), "yyyy-MM-dd HH:mm:ss");
    }

    /**
     * 得到当前年份字符串 格式（yyyy）
     */
    public static String getYear() {
        return formatDate(new Date(), "yyyy");
    }

    /**
     * 得到当前月份字符串 格式（MM）
     */
    public static String getMonth() {
        return formatDate(new Date(), "MM");
    }

    /**
     * 得到当天字符串 格式（dd）
     */
    public static String getDay() {
        return formatDate(new Date(), "dd");
    }

    /**
     * 得到当前星期字符串 格式（E）星期几
     */
    public static String getWeek() {
        return formatDate(new Date(), "E");
    }

    /**
     * 日期型字符串转化为日期 格式
     * { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm",
     * "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm",
     * "yyyy.MM.dd", "yyyy.MM.dd HH:mm:ss", "yyyy.MM.dd HH:mm" }
     */
    public static Date parseDate(Object str) {
        if (str == null) {
            return null;
        }
        try {
            return parseDate(str.toString(), parsePatterns);
        } catch (ParseException e) {
            return null;
        }
    }

    /**
     * 获取过去的天数
     *
     * @param date
     * @return
     */
    public static long pastDays(Date date) {
        long t = new Date().getTime() - date.getTime();
        return t / (24 * 60 * 60 * 1000);
    }

    /**
     * 获得当前时间的字符串类型
     * @return
     */
    public static String toStr() {
        return toStr(new Date());
    }

    /**
     * Date转成"yyyy-MM-dd HH:mm:ss"格式的字符串
     * @param date
     * @return
     */
    public static String toStr(Date date) {
        return format(date, "yyyy-MM-dd HH:mm:ss");
    }

    /**
     * 将一个 Date 格式化为日期/时间字符串
     * @param date 要格式化为时间字符串的时间值
     * @param pattern 日期和时间格式的模式
     * @return 已格式化的时间字符串
     */
    public static String format(Date date, String pattern) {
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        return sdf.format(date);
    }

    /**
     * 获取过去的小时
     *
     * @param date
     * @return
     */
    public static long pastHour(Date date) {
        long t = new Date().getTime() - date.getTime();
        return t / (60 * 60 * 1000);
    }

    /**
     * 获取过去的分钟
     *
     * @param date
     * @return
     */
    public static long pastMinutes(Date date) {
        long t = new Date().getTime() - date.getTime();
        return t / (60 * 1000);
    }

    /**
     *  将毫秒值转换为时间（天,时:分:秒.毫秒）
     *
     * @param timeMillis
     * @return
     */
    public static String formatDateTime(long timeMillis) {
        long day = timeMillis / (24 * 60 * 60 * 1000);
        long hour = (timeMillis / (60 * 60 * 1000) - day * 24);
        long min = ((timeMillis / (60 * 1000)) - day * 24 * 60 - hour * 60);
        long s = (timeMillis / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);
        long sss = (timeMillis - day * 24 * 60 * 60 * 1000 - hour * 60 * 60 * 1000 - min * 60 * 1000 - s * 1000);
        return (day > 0 ? day + "," : "") + hour + ":" + min + ":" + s + "." + sss;
    }

    /**
     * 获取两个日期之间的天数
     *
     * @param before
     * @param after
     * @return
     */
    public static double getDaysBetweenDate(Date before, Date after) {
        return getMillisecBetweenDate(before,after) / (1000 * 60 * 60 * 24);
    }

    /**
     * 获取两个日期之间的毫秒数
     * @param before
     * @param after
     * @return
     */
    public static long getMillisecBetweenDate(Date before, Date after){
        long beforeTime = before.getTime();
        long afterTime = after.getTime();
        return afterTime - beforeTime;
    }

    /**
     * 获取当前月的第一天
     * @return
     */
    public static String getFirstDayOfMonth() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        //获取当前月第一天：
        Calendar c = Calendar.getInstance();
        c.add(Calendar.MONTH, 0);
        c.set(Calendar.DAY_OF_MONTH, 1);//设置为1号,当前日期既为本月第一天
        String first = format.format(c.getTime());
        return first;
    }

    /**
     * 获得当前时间的时间戳
     * @return
     */
    public static Timestamp getTimestamp() {
        return new Timestamp(new Date().getTime());
    }

    /**
     *
     * 方法名: getDoubleType
     * 描述: 返回时间的 double
     * 参数: @param dateString
     * 参数: @return
     * 参数: @throws ParseException    设定文件
     */
    public static double getDoubleType(String dateString) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = sdf.parse(dateString);
        return date.getTime();
    }


    /**
     * 获得两个Date之间的秒数
     * @param startTime 开始时间
     * @param endTime   结束时间
     * @return
     */
    public static int calLastedTime(Date startTime, Date endTime) {
        long a = startTime.getTime();
        long b = endTime.getTime();
        int c = (int) ((a - b) / 1000);
        return c;
    }

    /**
     * 获取若干个小时之后的时间（字符串类型）
     * @param startTime
     * @param hours
     * @return
     */
    public static String getPassHours(String startTime, int hours) {
        // 获取一个小时以后的时间
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        java.util.Date date = null;
        try {
            date = df.parse(startTime);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) + hours);
        return df.format(calendar.getTime());
    }


    /**
     * "yyyy-MM-dd HH:mm:ss"格式的日期在若干天数后的时间（字符串）
     * @param time
     * @param days
     * @return
     */
    public static String getAddDate(String time,int days) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = null;
        try {
            date = dateFormat.parse(time);
        } catch (ParseException e) {
            e.printStackTrace();
        } // 指定日期
        Date newDate = null;
        try {
            newDate = addDate(date, days);
        } catch (ParseException e) {
            e.printStackTrace();
        } // 指定日期加上20天
        String st = dateFormat.format(newDate);
        return st;
    }

    /**
     * 指定时间在若干天后的时间
     * @param date
     * @param day
     * @return
     * @throws ParseException
     */
    public static Date addDate(Date date,long day) throws ParseException {
        long time = date.getTime(); // 得到指定日期的毫秒数
        day = day*24*60*60*1000; // 要加上的天数转换成毫秒数
        time+=day; // 相加得到新的毫秒数
        return new Date(time); // 将毫秒数转换成日期
    }

    /**
     * 获取当天的某一时刻Date
     * @param hour      24小时
     * @param min       分钟
     * @param sec       秒
     * @param mill      毫秒
     * @return
     */
    public static Date getMoment(int hour, int min, int sec, int mill){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        calendar.set(Calendar.HOUR_OF_DAY,hour);
        calendar.set(Calendar.MINUTE,min);
        calendar.set(Calendar.SECOND,sec);
        calendar.set(Calendar.MILLISECOND,mill);
        return calendar.getTime();
    }

    /**
     * 获得指定某年某月某日某刻的Date
     * @param year      年
     * @param month 月
     * @param day       日
     * @param hour      24小时制
     * @param min       分钟
     * @param sec       秒
     * @param mill      毫秒
     * @return
     */
    public static Date getMoment(int year,int month,int day,int hour,int min,int sec,int mill){
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR,year);
        calendar.set(Calendar.MONTH,month);
        calendar.set(Calendar.DAY_OF_MONTH,day);
        calendar.set(Calendar.HOUR_OF_DAY,hour);
        calendar.set(Calendar.MINUTE,min);
        calendar.set(Calendar.SECOND,sec);
        calendar.set(Calendar.MILLISECOND,mill);
        return calendar.getTime();
    }

}

4.ReflectionUtils举例(拼接sql语句)

package com.id0304.utils;

import java.lang.reflect.Field;
import java.sql.Timestamp;

/**
 * 反射工具类
 */
public class ReflectionUtils {
    //封装当前类和父类的所有属性,拼接属性sql
    public static String fatherAndSonField(Object obj) {
        if (obj == null) {
            return null;
        }
        //获取class文件
        Class classInfo = obj.getClass();
        //获取当前类的属性sql
        Field[] sonFields = classInfo.getDeclaredFields();
        String s1 = getField(sonFields);
        Field[] fatherFields = classInfo.getSuperclass().getDeclaredFields();
        String s2 = getField(fatherFields);
        return s1 + "," + s2;
    }

    //获取当前类和父类的属性值
    public static String fatherAndSonFieldValue(Object obj) {
        if (obj == null) {
            return null;
        }
        //获取class文件
        Class classInfo = obj.getClass();
        //获取当前类的属性sql
        Field[] sonFields = classInfo.getDeclaredFields();
        String s1 = getFieldValue(obj, sonFields);
        Field[] fatherFields = classInfo.getSuperclass().getDeclaredFields();
        String s2 = getFieldValue(obj, fatherFields);
        return s1 + "," + s2;
    }

    public static String getField(Field[] declaredFields) {
        StringBuffer sf = new StringBuffer();
        for (int i = 0; i < declaredFields.length; ++i) {
            sf.append(declaredFields[i].getName());
            if (i < declaredFields.length - 1) {
                sf.append(",");
            }
        }
        return sf.toString();
    }

    public static String getFieldValue(Object obj, Field[] declaredFields) {
        StringBuffer sf = new StringBuffer();
        for (int i = 0; i < declaredFields.length; ++i) {
            //获取属性值
            try {
                //运行操作私有属性
                declaredFields[i].setAccessible(true);

                Field field = declaredFields[i];
                Object value = field.get(obj);

                //标识类型是否为String类型
                boolean flag = false;
                if (value != null && (value instanceof String||value instanceof Timestamp)) {
                    flag = true;
                }
                if (flag) {
                    sf.append("'" + value + "'");
                } else {
                    sf.append(value);
                }
                if (i < declaredFields.length - 1) {
                    sf.append(",");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return sf.toString();
    }
}

5.TokenUtil简单示例

package com.id0304.utils;

import org.springframework.stereotype.Component;

import java.util.UUID;

public class TokenUtils {
    public static String getToken(){
        return UUID.randomUUID().toString();
    }
}

6.BaseApiService 和BaseApiConstants :

package com.id0304.common.api;

import com.id0304.constants.BaseApiConstants;

import java.util.HashMap;
import java.util.Map;

/**
 * 通用base api父类
 */
public class BaseApiService {
    /**
     * 返回错误
     * @param msg
     * @return
     */
    public Map setResultError(String msg){
        return setResult(BaseApiConstants.HTTP_500_CODE,BaseApiConstants.HTTP_ERROR_NAME,null);
    }

    /**
     * 返回错误
     * @param msg
     * @return
     */
    public Map setParamError(String msg){
        return setResult(BaseApiConstants.HTTP_400_CODE,msg,null);
    }

    /**
     * 返回成功
     * @return
     */
    public Map setResultSuccess(){
        return setResult(BaseApiConstants.HTTP_200_CODE,BaseApiConstants.HTTP_SUCCESS_NAME,null);
    }

    /**
     * 返回成功
     * @return
     */
    public Map setResultSuccessData(Object data){
        return setResult(BaseApiConstants.HTTP_200_CODE,BaseApiConstants.HTTP_SUCCESS_NAME,data);
    }

    /**
     * 返回成功
     * @param msg
     * @return
     */
    public Map setResultSuccess(String msg){
        return setResult(BaseApiConstants.HTTP_200_CODE,msg,null);
    }

    /**
     * 自定义返回
     * @param code
     * @param msg
     * @param data
     * @return
     */
    public Map setResult(Integer code,String msg,Object data){
        HashMap result = new HashMap<>();
        result.put(BaseApiConstants.HTTP_CODE_NAME,code);
        result.put(BaseApiConstants.HTTP_MESSAGE_NAME,msg);
        result.put(BaseApiConstants.HTTP_DATA_NAME,data);
        return result;
    }

}

package com.id0304.constants;

public interface BaseApiConstants {
    String HTTP_MESSAGE_NAME = "msg";
    String HTTP_CODE_NAME = "code";
    String HTTP_DATA_NAME = "data";
    Integer HTTP_200_CODE = 200;
    Integer HTTP_500_CODE = 500;
    Integer HTTP_400_CODE = 400;
    String HTTP_ERROR_NAME = "error";
    String HTTP_SUCCESS_NAME = "success";
}

7.BaseEntity(每个entity都要有的属性):

package com.id0304.common.entity;

import lombok.Getter;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;

import java.sql.Timestamp;

/**
 * 封装一些相同的属性和字段
 */
@Setter
@Getter
public class BaseEntity {
    //主键
    private Long id;
    //创建时间
    private Timestamp created;
    //修改时间
    private Timestamp updated;

}

8.aop切面日志:

package com.id0304.common.log;

import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;

//@Aspect
//@Component
@Slf4j
public class LogAspectServiceApi {
    private JSONObject jsonObject = new JSONObject();

    //申明一个切点 里面是execution表达式
    @Pointcut("execution(public * com.id0304.api.service.*.*(..))")
    private void controllerAspect(){

    }

    //请求method前打印的内容
    @Before(value = "controllerAspect()")
    public void methodBefore(JoinPoint joinPoint){
        ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = requestAttributes.getRequest();
        log.info("==============请求内容==============");
        try{
            //打印请求内容
            log.info("请求地址:"+request.getRequestURL().toString());
            log.info("请求方式:"+request.getMethod());
            log.info("请求类方法:"+joinPoint.getSignature());
            log.info("请求类方法参数:"+ Arrays.toString(joinPoint.getArgs()));
        }catch (Exception e){
            //打印请求内容
            log.error("###LogAspectServiceApi.class methodBefore() ### ERROR:",e);
        }
        log.info("==============请求内容==============");
    }

    // 在方法执行完结后打印返回内容
    @AfterReturning(returning = "o",pointcut = "controllerAspect()")
    public void methodAfterReturning(Object o){
        log.info("--------------返回内容--------------");
        try {
            log.info("Response内容:"+jsonObject.toJSONString(o));
        }catch (Exception e){
            log.error("###LogAspectServiceApi.class methodBefore() ### ERROR:",e);
        }
        log.info("--------------返回内容--------------");
    }

}

9.BaseDao和BaseProvider:

插入和删除语句公共提取,可以给其它Dao继承,利用反射拼接sql语句:

package com.id0304.common.mybatis;

import org.apache.ibatis.annotations.InsertProvider;
import org.apache.ibatis.annotations.Param;

public interface BaseDao {
    //自定义sql语句,插入示例
    @InsertProvider(type = BaseProvider.class,method = "save")
    public void save(@Param("obj") Object obj,@Param("table") String table);
}

package com.id0304.common.mybatis;

import com.id0304.utils.ReflectionUtils;
import org.apache.ibatis.jdbc.SQL;

import java.util.Map;

public class BaseProvider {
    //自定义封装sql语句
    public String save(Map map){
        //实体类
        Object obj = map.get("obj");

        //表名称
        String table = (String) map.get("table");
        //生成添加的sql语句,使用反射机制
        //步骤:使用反射机制加载所有属性
        SQL sql = new SQL() {
            {
                INSERT_INTO(table);
                VALUES(ReflectionUtils.fatherAndSonField(obj), ReflectionUtils.fatherAndSonFieldValue(obj));
            }
        };
        return sql.toString();
    }
}

10.BaseRedisService :

package com.id0304.common.redis;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

@Component
public class BaseRedisService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 添加redis信息
     * @param key
     */
    public void setString(String key, String value) {
        set(key, value, null);
    }

    public void setString(String key, String value, Long timeOut) {
        set(key, value, timeOut);
    }

    private void set(String key, Object value, Long timeOut) {
        if (value != null) {
            if (value instanceof String) {
                String setValue = (String) value;
                stringRedisTemplate.opsForValue().set(key, setValue);
            }
            //设置有效期
            if (timeOut != null) {
                stringRedisTemplate.expire(key, timeOut, TimeUnit.SECONDS);
            }
        }
    }

    /**
     * 使用key查找redis信息
     * @param key
     */
    public String get(String key){
        return stringRedisTemplate.opsForValue().get(key);
    }

    /**
     * 使用key删除redis信息
     * @param key
     */
    public void delete(String key){
        stringRedisTemplate.delete(key);
    }

}