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

1package tools;
2
3import lombok.Data;
4
5/**
6 * 车辆实体类
7 */
8@Data
9public class Car {
10
11    private String id;
12    private String model;//型号
13    private String color;//颜色
14    private String volume;//排量
15    private int year;//年份
16}

然后是主要方法和测试类

1package tools;
2
3import java.lang.reflect.Field;
4import java.util.HashMap;
5import java.util.Map;
6
7public class MapTools {
8
9    public static void main(String[] args) throws Exception{
10        Car car = new Car();
11        car.setId("00000");
12        car.setColor("black");
13        car.setModel("bmw x5");
14        car.setVolume("3.0L");
15        car.setYear(2018);
16
17        System.out.println(objectToMap(car));
18    }
19
20    /**
21     * 将Object对象里面的属性和值转化成Map对象
22     *
23     * @param obj
24     * @return
25     * @throws IllegalAccessException
26     */
27    public static Map<String, Object> objectToMap(Object obj) throws IllegalAccessException {
28        Map<String, Object> map = new HashMap<String,Object>();
29        Class<?> clazz = obj.getClass();
30        for (Field field : clazz.getDeclaredFields()) {
31            field.setAccessible(true);
32            String fieldName = field.getName();
33            Object value = StringUtils.nvl(field.get(obj));
34            map.put(fieldName, value);
35        }
36        return map;
37    }
38}

输出

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