BeanUtil拷贝

Posted 2021-01-30 ssjf

拷贝vo对象

一些查询到的数据很多是不需要的，可以创建vo对象，对需要的对象属性进行拷贝

maven依赖

<dependency>
　　<groupId>org.projectlombok</groupId>
　　<artifactId>lombok</artifactId>
　　<version>1.18.2</version>
　　<scope>provided</scope>
</dependency>

封装好的BeanUtil工具类

vo对象的字段名要跟源对象的一样

package com.seacoders.weigh.commons;

import com.seacoders.weigh.commons.exception.BeanCopyException;
import org.springframework.beans.BeanUtils;

import java.util.ArrayList;
import java.util.List;

/**
 * @author 
 * @date 
 *
 * 对Spring BeanUtils扩展，支持List集合拷贝
 */
public class BeanUtil {

    public static void copyProperties(Object source, Object target) {
        BeanUtils.copyProperties(source, target);
    }

    /**
     * 拷贝Bean对象
     * @param source 源对象
     * @param clazz 目标对象额Class
     * @param <T>
     * @return
     */
    public static <T> T copyProperties(Object source, Class<T> clazz){
        Object target = null;
        try {
            target = clazz.newInstance();
            copyProperties(source, target);
            return (T)target;
        } catch (InstantiationException e) {
            throw new BeanCopyException(e.getMessage());
        } catch (IllegalAccessException e) {
            throw new BeanCopyException(e.getMessage());
        }

    }

    /**
     * 拷贝List集合
     * @param source 源对象集合
     * @param clazz 目标对象Class
     * @param <T>
     * @return
     */
    public static <T> List<T> copyListProperties(List source, Class<T> clazz) {
        List<T> list = new ArrayList<>();
        for (Object o : source) {
            Object target = copyProperties(o, clazz);
            list.add((T)target);
        }
        return list;
    }
}