BeanUtils之对象实体类转HashMap

BeanUtils之对象实体类转HashMap

package com.example.demo.common.Utils;

import org.apache.catalina.util.Introspection;

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.HashMap;
import java.util.Map;

// 实体工具类
public class BeanUtils {

    /**
     * 把实体类变成map。
     * @param bean 传入一个bean
     * @return hashMap
     * @throws IllegalStateException
     * @throws InvocationTargetException
     * @throws IntrospectionException
     */
    public static Map<String,Object> beanToMap(Object bean) throws InvocationTargetException, IntrospectionException, IllegalAccessException {
        Map<String,Object> retrunMap = new HashMap<>();
        BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

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