常用日期、字符串工具类

src/main/java/com/DateUtils.java

+package com;
+
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
+
+/**
+ * @Author 	zhenxin.ma
+ * @Date 	2019/8/29 17:28
+ * @Version 1.0
+ */
+public class DateUtils {
+	public static ThreadLocal<SimpleDateFormat> simpleDateFormatThreadLocal=new ThreadLocal<SimpleDateFormat>(){
+		@Override
+		protected SimpleDateFormat initialValue() {
+			return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+		}
+	};
+
+	/**
+	 * @Description 毫秒转换成标准时间 yyyy-MM-dd HH:mm:ss
+	 * @param time
+	 * @return java.lang.String
+	 **/
+	public static String milliSecondsFormatTime(String time){
+		Date tmpDate = new Date();
+		tmpDate.setTime(Long.parseLong(time));
+		String dtime = simpleDateFormatThreadLocal.get().format(tmpDate);
+		return dtime;
+	}
+
+	//获取今天的时间
+	public static String getTodayDate() {
+		return simpleDateFormatThreadLocal.get().format(new Date());
+	}
+
+	//获取昨天的日期:yyyy-MM-dd
+	public static String getYesterdayTime(int gapDay){
+		Calendar calendar=Calendar.getInstance();
+		calendar.set(Calendar.HOUR_OF_DAY,24*gapDay);
+		String yesterdayDate=simpleDateFormatThreadLocal.get().format(calendar.getTime());
+		return  yesterdayDate;
+	}
+
+	public static void main(String[] args) {
+		final String time = getYesterdayTime(-1);
+		System.out.println(time);
+		final String s = time.split(" ")[0];
+		System.out.println(s);
+		System.out.println(s.replace("-", ""));
+		System.out.println(getTodayDate());
+
+	}
+
+}
+

src/main/java/com/Util.java

+package com;
+
+import java.lang.reflect.Array;
+import java.util.Collection;
+import java.util.Map;
+
+/**
+ * 通用工具类
+ * @Author 	zhenxin.ma
+ * @Date 	2019/9/18 15:16
+ * @Version 1.0
+ */
+public class Util {
+	/**
+	 * 判断是否为空，支持字符串、map、集合、数组和其它对象
+	 *
+	 * @param obj				判断的对象
+	 * @return 					为空返回True，不为空返回False
+	 */
+	public static boolean isEmpty(Object obj){
+		if(obj == null){
+			return true;
+		}else if (obj instanceof String){
+			return "".equals(String.valueOf(obj).trim());
+		}else if (obj instanceof Map<?,?>){
+			return ((Map<?,?>) obj).isEmpty();
+		}else if (obj instanceof Collection<?>){
+			return ((Collection<?>) obj).isEmpty();
+		}else if (obj.getClass().isArray()){
+			return Array.getLength(obj) == 0;
+		}
+		return false;
+	}
+
+	/**
+	 * 判断是否为空，支持字符串、map、集合、数组和其它对象
+	 *
+	 * @param obj				判断的对象
+	 * @return 					为空返回False，不为空返回True
+	 */
+	public static boolean isNotEmpty(Object obj){
+		return !isEmpty(obj);
+	}
+
+
+}
+