Java反射获取和修改成员变量

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

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/**
* 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);
}

}
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