com.feingto.cloud.kit.reflection.BeanConvertKit Maven / Gradle / Ivy

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package com.feingto.cloud.kit.reflection;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Bean属性转换工具类
 *
 * @author longfei
 */
@Slf4j
public abstract class BeanConvertKit extends org.springframework.beans.BeanUtils {
    /**
     * 把Bean数据转换到另外一个类的对象中。
     *
     * @param source      数据源
     * @param targetClass 目标对象的类
     * @return 目标对象
     */
    public static Object convert(Object source, Class targetClass) {
        if (source == null)
            return null;

        try {
            Object target = targetClass.newInstance();
            copyProperties(source, target);
            return target;
        } catch (InstantiationException e) {
            log.error("Can't create Instance of Class:" + targetClass, e);
        } catch (IllegalAccessException e) {
            log.error("Can't access construct method of Class:" + targetClass, e);
        }

        return null;
    }

    /**
     * 把Bean集合数据转换到另外一个类的集合对象中。
     *
     * @param sources     数据源集合
     * @param targetClass 目标对象的类
     * @return 目标对象
     */
    public static Object convert(Collection sources, Class targetClass) {
        if (sources == null)
            return null;

        return sources.stream()
                .map(obj -> {
                    Object target = null;
                    try {
                        target = targetClass.newInstance();
                        copyProperties(obj, target);
                    } catch (InstantiationException e) {
                        log.error("Can't create Instance of Class:" + targetClass, e);
                    } catch (IllegalAccessException e) {
                        log.error("Can't access construct method of Class:" + targetClass, e);
                    }
                    return target;
                })
                .collect(Collectors.toList());
    }

    /**
     * 把Bean数据转换到另外一个类的对象中，源对象的空值不转换。
     *
     * @param source 数据源
     * @param target 目标对象
     */
    public static void copyProperties(Object source, Object target) throws BeansException {
        Stream.of(getPropertyDescriptors(target.getClass()))
                .filter(targetPd -> targetPd.getWriteMethod() != null)
                .forEach(targetPd -> {
                    PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());
                    if (sourcePd != null && sourcePd.getReadMethod() != null) {
                        try {
                            Method readMethod = sourcePd.getReadMethod();
                            if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {
                                readMethod.setAccessible(true);
                            }
                            Object value = readMethod.invoke(source);
                            // 判断value是否为空（这里也能进行一些特殊要求的处理，例如绑定时格式转换等等。）
                            if (value != null) {
                                Method writeMethod = targetPd.getWriteMethod();
                                if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {
                                    writeMethod.setAccessible(true);
                                }
                                writeMethod.invoke(target, value);
                            }
                        } catch (Exception e) {
                            throw new FatalBeanException("Could not copy properties from source to target", e);
                        }
                    }
                });
    }
}