Java对象转换成Map

需求总是千奇百怪，对象转成map，看似没必要，但就是有这个需求，所以记录下来

首先是bean

package tools;

import lombok.data;

/**
 * 车辆实体类
 */
@data
public class car {

    private string id;
    private string model;//型号
    private string color;//颜色
    private string volume;//排量
    private int year;//年份
}

然后是主要方法和测试类

package tools;

import java.lang.reflect.field;
import java.util.hashmap;
import java.util.map;

public class maptools {

    public static void main(string[] args) throws exception{
        car car = new car();
        car.setid("00000");
        car.setcolor("black");
        car.setmodel("bmw x5");
        car.setvolume("3.0l");
        car.setyear(2018);

        system.out.println(objecttomap(car));
    }

    /**
     * 将object对象里面的属性和值转化成map对象
     *
     * @param obj
     * @return
     * @throws illegalaccessexception
     */
    public static map<string, object> objecttomap(object obj) throws illegalaccessexception {
        map<string, object> map = new hashmap<string,object>();
        class<?> clazz = obj.getclass();
        for (field field : clazz.getdeclaredfields()) {
            field.setaccessible(true);
            string fieldname = field.getname();
            object value = stringutils.nvl(field.get(obj));
            map.put(fieldname, value);
        }
        return map;
    }
}

输出

{volume=3.0l, color=black, year=2018, model=bmw x5, id=00000}