---
title: Java反射获取和修改成员变量
date: 2019-12-25 13:38:05
description: Java反射获取和修改成员变量
categories: [技术总结]
tags: [Java]
---

特定的需求需要根据前端传的字段名称设置值，这时候使用反射比较方便

```java
/**
 * 反射工具类
 */
public class ReflectionUtils {

    /**
     * 根据传入的属性名字符串，获取对应的属性值
     *
     * @param name
     *            属性名
     * @param obj
     *            要获取的实例对象
     */
    public static Object getField(String name, Object obj)
            throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
        Class<?> clazz = obj.getClass();
        Field field = clazz.getDeclaredField(name);
        field.setAccessible(true);
        return field.get(obj);
    }

    /**
     * 根据传入的属性名字符串，修改对应的属性值
     *
     * @param name
     *            属性名
     * @param obj
     *            要修改的实例对象
     * @param value
     *            修改后的新值
     */
    public static void setField(String name, Object obj, Object value)
            throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
        Class<?> clazz = obj.getClass();
        Field field = clazz.getDeclaredField(name);
        field.setAccessible(true);
        field.set(obj, value);
    }

    public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException {
        IncomeTaxDeclarationMain a = new IncomeTaxDeclarationMain();
        a.row9 = BigDecimal.TEN;
        IncomeTaxDeclarationMain b = new IncomeTaxDeclarationMain();
        setField("row9", b, getField("row9", a));
        System.out.println(b.row9);
    }

}
```