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简单带时间字段类

package com.xxxxx.entity;import java.time.LocalDate;import lombok.Data;import lombok.EqualsAndHashCode;import lombok.experimental.Accessors;/** * @author zws * @since 2019-10-11 */@Data@EqualsAndHashCode(callSuper = true)@Accessors(chain = true)public class BsUpholdOrder extends BaseEntity {    private static final long serialVersionUID = 1L;    /**     * 保养日期     */    private LocalDate upholdDate;    /**     * 实际保养人     */    private String upholdPerson;}

BaseEntity 只是一个id 分页参数公共类，要不要无所谓。

骚操作开始：

public static void main(String[] args) {        List
   
     orders = new ArrayList<>();        BsUpholdOrder order1 = new BsUpholdOrder();        order1.setUpholdPerson("张三1");        order1.setUpholdDate(LocalDate.now());        BsUpholdOrder order2 = new BsUpholdOrder();        order2.setUpholdPerson("张三2");        order2.setUpholdDate(LocalDate.now().withMonth(9));        BsUpholdOrder order3 = new BsUpholdOrder();        order3.setUpholdPerson("张三3");        order3.setUpholdDate(LocalDate.now());        BsUpholdOrder order4 = new BsUpholdOrder();        order4.setUpholdPerson("张三4");        order4.setUpholdDate(LocalDate.now().withMonth(8));        orders.add(order1);        orders.add(order2);        orders.add(order3);        orders.add(order4);        //分组 按月        Map
    
     
      > groupByMonth = orders.stream().collect(Collectors.groupingBy(o -> o.getUpholdDate().getMonthValue()));        System.out.println(groupByMonth);    }
     
    
   

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