backend_code/src/main/java/com/template/common/utils/CommonUtil.java

package com.template.common.utils;

import lombok.extern.slf4j.Slf4j;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.MessageDigest;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;

/**
 * 公共工具类
 **/
@Slf4j
public class CommonUtil {
    /**
     * 检测客户端参数
     * @param code 状态码
     * @param object 对象
     * @return 返回类型
     */
    public static Map<String, Object> getReturnMap(String code, Object object) {
        Map<String, Object> returnMap = new HashMap<>();
        returnMap.put("code", code);
        returnMap.put("msg", object);
        return returnMap;
    }

    /**
     * 获取ip
     *
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            System.out.println("x-forwarded-for=" + ipAddress);
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
                System.out.println("Proxy-Client-IP=" + ipAddress);
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
                System.out.println("WL-Proxy-Client-IP=" + ipAddress);
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                System.out.println("getRemoteAddr=" + ipAddress);
                if (ipAddress.equals("127.0.0.1")) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                    System.out.println("getHostAddress=" + ipAddress);
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) {
                // "***.***.***.***".length()
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress = "";
        }
        return ipAddress;
    }


    /**
     * 获取全部请求头
     *
     * @param request
     * @return
     */
    public static Map<String, String> getAllRequestHeader(HttpServletRequest request) {
        Enumeration<String> headerNames = request.getHeaderNames();
        Map<String, String> map = new HashMap<>();
        while (headerNames.hasMoreElements()) {
            String key = headerNames.nextElement();
            //根据名称获取请求头的值
            String value = request.getHeader(key);
            map.put(key, value);
        }

        return map;
    }


    /**
     * MD5加密
     *
     * @param data
     * @return
     */
    public static String MD5(String data) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] array = md.digest(data.getBytes("UTF-8"));
            StringBuilder sb = new StringBuilder();
            for (byte item : array) {
                sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
            }

            return sb.toString().toUpperCase();
        } catch (Exception exception) {
        }
        return null;
    }


    /**
     * 获取验证码随机数
     *
     * @param length
     * @return
     */
    public static String getRandomCode(int length) {
        String sources = "0123456789";
        Random random = new Random();
        StringBuilder sb = new StringBuilder();
        for (int j = 0; j < length; j++) {
            sb.append(sources.charAt(random.nextInt(9)));
        }
        return sb.toString();
    }

    /**
     * 获取当前时间戳
     *
     * @return
     */
    public static long getCurrentTimestamp() {
        return System.currentTimeMillis();
    }

    /**
     * 生成uuid
     *
     * @return
     */
    public static String generateUUID() {
        return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
    }

    /**
     * 获取随机长度的串
     *
     * @param length
     * @return
     */
    private static final String ALL_CHAR_NUM = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    public static String getStringNumRandom(int length) {
        //生成随机数字和字母,
        Random random = new Random();
        StringBuilder saltString = new StringBuilder(length);
        for (int i = 1; i <= length; ++i) {
            saltString.append(ALL_CHAR_NUM.charAt(random.nextInt(ALL_CHAR_NUM.length())));
        }
        return saltString.toString();
    }

    /**
     * LocalDate 拼接时间转成 LocalDateTime
     *
     * @param localDate
     * @param timeStr   HH:mm:ss
     * @return
     */
    public static LocalDateTime localDateToTime(LocalDate localDate, String timeStr) {
        LocalTime time = LocalTime.parse(timeStr);
        return LocalDateTime.of(localDate.getYear(), localDate.getMonth(), localDate.getDayOfMonth(),
                time.getHour(), time.getMinute(), time.getSecond());
    }
}