Question

如何通过反射在Java中调用Bean私有setter方法

我不明白如何在“我的用户Bean”中调用私有setter方法。我都准备好使用PropertyDescriptor和许多方法，但我无法访问私有反射的二传手方法。

public class GetterAndSetter
 {
     public static void main(String[] args)
     {
         GetterAndSetter gs = new GetterAndSetter();
         User user = new User();

          try {
            gs.callSetter(user,"name","Sanket");
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IntrospectionException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

     }

     private void callSetter(Object obj,String fieldName, Object value) throws IntrospectionException, InvocationTargetException, IllegalAccessException , IllegalArgumentException
     {
         PropertyDescriptor pd;

         pd = new PropertyDescriptor(fieldName,obj.getClass());
         pd.getWriteMethod().invoke(obj,value);
     }

 }

此代码我只能访问字段并设置字段中的值，但是我不能直接将设置者字段访问到反射

Answer 1

如何在User类中调用私有方法：

try {
    User user = new User();
    Method method = User.class.getDeclaredMethod("setName", String.class);
    method.setAccessible(true);
    method.invoke(user, "Some name");
    System.out.println("user.getName() = " + user.getName());
} catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
    e.printStackTrace();
}

注意对method.setAccessible(true);的呼叫

如何通过反射在Java

1 个答案: