关于BeanCopy的常用方法

package hcj.info.hcjinfo.OftenUseApi;

import cn.hutool.core.bean.BeanUtil;
import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.beans.BeanUtils;

import java.lang.reflect.InvocationTargetException;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * BeanUtil.copyProperties 和 BeanUtils.copyProperties用法
 * 主要区别：
 * BeanUtil.copyProperties只要key相同就会copy
 * BeanUtils.copyProperties需要key和类型相同才会copy
 * <p>
 * Map与实体直接相互转换
 *
 * @author hcj
 */
public class BeanCopyApi {
    public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {
        Student stu = new Student(20, "zz", LocalDateTime.now());
        // age=20, name=zz, date=2021-10-26T11:07:52.471
        System.out.println("stu ==" + stu);

        Student1 stu1 = new Student1();
        // key值相同，即复制，若类型不一致可能会导致转换错误
        BeanUtil.copyProperties(stu, stu1);
        System.out.println("stu1==" + stu1);
        // age=20, name=zz, date=2021-10-26T11:07:52.471

        // key值相同，且类型相同即复制
        Student1 stu1s = new Student1();
        BeanUtils.copyProperties(stu, stu1s);
        System.out.println("stu1s==" + stu1s);
        // age=null, name=zz, date=null


        Student1 stu11 = new Student1();
        // 复制时排除age属性字段
        BeanUtil.copyProperties(stu, stu11, "age");
        System.out.println("stu11==" + stu11);
        // age=null, name=zz, date=2021-10-26T11:07:52.471

        Student2 stu2 = new Student2();
        // 属性值不一样，不进行copy,区分大小写
        BeanUtil.copyProperties(stu, stu2);
        System.out.println("stu2==" + stu2);
        // Age=null, Name=null, date=2021-10-26T11:07:52.471

        Student2 stu22 = new Student2();
        // 忽略大小写
        BeanUtil.copyProperties(stu, stu22, true);
        System.out.println("stu22==" + stu22);
        // Age=20, Name=zz, date=2021-10-26T11:07:52.471

        // 有返回值的copy
        Student1 stu3 = BeanUtil.copyProperties(stu, Student1.class);
        System.out.println("stu3==" + stu3);
        // age=20, name=zz, date=2021-10-26T11:07:52.471

        Map map = new HashMap<>(3);
        map.put("age", "26");
        map.put("name", "hh");
        map.put("date", LocalDateTime.now());
        System.out.println("map==" + map);

        Student stu4 = BeanUtil.toBean(map, Student.class);
        System.out.println("stu4==" + stu4);

        Student stu5 = BeanUtil.toBeanIgnoreError(map, Student.class);
        System.out.println("stu5==" + stu5);

        Map<String, Object> map11 = BeanUtil.beanToMap(stu);
        System.out.println("map11==" + map11);

        // 将实体类 转换为 Map
        Map map111 = JSON.parseObject(JSON.toJSONString(stu), Map.class);
        System.out.println(map111);
    }

    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public static class Student {
        private Integer age;
        private String name;
        @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
        private LocalDateTime date;
    }

    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public static class Student1 {
        private String age;
        private String name;
        private String date;
    }

    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public static class Student2 {
        private String Age;
        private String Name;
        private String date;
    }

}