JavaBeanUtils javaBean转map, 实体类转map,实体集合转List＜Map＞

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package com.application.util;

import com.alibaba.fastjson.JSON;
import org.springframework.util.ObjectUtils;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class JavaBeanUtils {

    /**
     * 实体类 转 Map
     * @param bean 要转化的JavaBean 对象
     * @param flagNull true 去除Bean字段空值，  false Bean空字段，同样生成Map
     * @return 转化出来的  Map 对象
     * @throws IntrospectionException   如果分析类属性失败
     * @throws IllegalAccessError   如果实例化 JavaBean 失败
     * @throws InvocationTargetException 如果调用属性的 setter 方法失败
     */
    public static Map<String, Object> convertBeanToMap(Object bean, boolean flagNull) throws IntrospectionException, IllegalAccessException, InvocationTargetException {
        Class type = bean.getClass();
        Map<String, Object> returnMap = new HashMap<>();
        BeanInfo beanInfo = Introspector.getBeanInfo(type);
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

        for (int i = 0; i < propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (!"class".equals(propertyName)) {
                Method readMethod = descriptor.getReadMethod();
                Object result = readMethod.invoke(bean, new Object[0]);
                if (flagNull) {
                    if (!ObjectUtils.isEmpty(result)) {
                        returnMap.put(propertyName, result);
                    }
                } else {
                    if (ObjectUtils.isEmpty(result)) {
                        returnMap.put(propertyName, "");
                    } else {
                        returnMap.put(propertyName, result);
                    }
                }
            }
        }
        return  returnMap;
    }

    /**
     * 实体类 转 Map
     * @param obj
     * @return
     */
    public static Map<String, Object> beanToMap(Object obj) {
        Map<String, Object> params = JSON.parseObject(JSON.toJSONString(obj), Map.class);
        return params;
    }

    /**
     * Map转实体类
     *
     * @return
     */
    public static <T> T mapToBean(Map<String, Object> params, Class<T> clazz) {
        T obj = JSON.parseObject(JSON.toJSONString(params), clazz);
        return obj;
    }

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/**
 * list<Bean>转List<Map>
 * @return
 */
public static <T>  List<Map<String,Object>>beanListToMapList(List<T> beanList) {
    List<Map<String,Object>> resultList = new ArrayList<Map<String,Object>>();
    for (T bean : beanList) {
    Map<String,Object>  map = beanToMap(bean);
        resultList.add(map);
    }
    return resultList;
}

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