feat: base core util

Author: ElanYoung

spring-boot-base-core/src/main/java/com/starimmortal/core/util/CommonUtil.java

@@ -0,0 +1,158 @@
+package com.starimmortal.core.util;
+
+import com.starimmortal.core.constant.PatternConstant;
+import com.starimmortal.core.constant.StringConstant;
+import lombok.extern.slf4j.Slf4j;
+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.math.BigDecimal;
+import java.util.Calendar;
+import java.util.Random;
+
+/**
+ * 通用工具类
+ *
+ * @author william@StarImmortal
+ * @date 2021/02/08
+ */
+@Component
+@Slf4j
+public class CommonUtil {
+ /**
+ * 请求头
+ */
+ private static final String[] IP_HEADER_CANDIDATES = {
+ "X-Forwarded-For",
+ "Proxy-Client-IP",
+ "WL-Proxy-Client-IP",
+ "HTTP_X_FORWARDED_FOR",
+ "HTTP_X_FORWARDED",
+ "HTTP_X_CLUSTER_CLIENT_IP",
+ "HTTP_CLIENT_IP",
+ "HTTP_FORWARDED_FOR",
+ "HTTP_FORWARDED",
+ "HTTP_VIA",
+ "REMOTE_ADDR"
+ };
+
+ /**
+ * 金额单位元转化为分
+ * stripTrailingZeros：移除所有尾部零
+ *
+ * @param p 金额（单位：元）
+ * @return 金额（单位：分）
+ */
+ public static BigDecimal yuanToFenPlain(BigDecimal p) {
+ p = p.multiply(new BigDecimal("100"));
+ return p.stripTrailingZeros();
+ }
+
+ /**
+ * 获取本机ip地址
+ *
+ * @return ip地址
+ */
+ public static String getRemoteRealIp(HttpServletRequest request) {
+ if (request == null) {
+ if (null == RequestContextHolder.getRequestAttributes()) {
+ return null;
+ }
+ request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
+ }
+
+ for (String header : IP_HEADER_CANDIDATES) {
+ String ipList = request.getHeader(header);
+ if (ipList != null && ipList.length() != 0 && !"unknown".equalsIgnoreCase(ipList)) {
+ log.debug("ipList.split(\",\")[0]::{}", ipList.split(",")[0]);
+ return ipList.split(",")[0];
+ }
+ }
+
+ log.debug("request.getRemoteAddress()::{}", request.getRemoteAddr());
+ return request.getRemoteAddr();
+ }
+
+ /**
+ * 十位时间戳
+ *
+ * @return timestamp
+ */
+ public static String tenTimestamp() {
+ long timestamp = Calendar.getInstance().getTimeInMillis();
+ return Long.toString(timestamp).substring(0, Long.toString(timestamp).length() - 3);
+ }
+
+ /**
+ * 常规自动日期格式识别
+ *
+ * @param str 时间字符串
+ * @return Date
+ */
+ public static String getDateFormat(String str) {
+ boolean year = PatternConstant.DATE_PATTERN.matcher(str.substring(0, 4)).matches();
+ StringBuilder sb = new StringBuilder();
+ int index = 0;
+ if (!year) {
+ if (str.contains("月") || str.contains(StringConstant.LINE_SEPARATOR) || str.contains(StringConstant.SEPARATOR)) {
+ if (Character.isDigit(str.charAt(0))) {
+ index = 1;
+ }
+ } else {
+ index = 3;
+ }
+ }
+ for (int i = 0; i < str.length(); i++) {
+ char chr = str.charAt(i);
+ if (Character.isDigit(chr)) {
+ if (index == 0) {
+ sb.append("y");
+ }
+ if (index == 1) {
+ sb.append("M");
+ }
+ if (index == 2) {
+ sb.append("d");
+ }
+ if (index == 3) {
+ sb.append("H");
+ }
+ if (index == 4) {
+ sb.append("m");
+ }
+ if (index == 5) {
+ sb.append("s");
+ }
+ if (index == 6) {
+ sb.append("S");
+ }
+ } else {
+ if (i > 0) {
+ char lastChar = str.charAt(i - 1);
+ if (Character.isDigit(lastChar)) {
+ index++;
+ }
+ }
+ sb.append(chr);
+ }
+ }
+ return sb.toString();
+ }
+
+ /**
+ * 生成指定位数的随机数字字符串
+ *
+ * @param length 字符串长度
+ * @return 随机数字字符串
+ */
+ public static String randomNumbers(int length) {
+ Random random = new Random();
+ StringBuilder randomNumbers = new StringBuilder();
+ for (int i = 0; i < length; i++) {
+ randomNumbers.append(random.nextInt(10));
+ }
+ return randomNumbers.toString();
+ }
+}