获取class对象的三种方式以及获取其中的属性对象

看到class对象:
测试的两个类:

public class Father {
    private String sex;
    public String identity;
}

@RestController
@RequestMapping("/")
public class HelloController extends Father{

    private String name;
    public int age;

    @GetMapping("hello")
    public String Hello(){
        System.out.println("hello");
        ServletRequestAttributes sra= (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        StringBuffer url = sra.getRequest().getRequestURL();
        return "success,test1111111";
    }

    public void test11(){
        System.out.println("111");
    }

    private void test22(){
        System.out.println("22");
    }
}

TestController:

public class testController {
    public static void main(String[] args) {
        testClass();
    }

    public static void testClass(){
        try {
            //获取类对象的三种方法
            //xx.getClass()
            HelloController hello=new HelloController();
            Class<? extends HelloController> hh = hello.getClass();
            System.out.println("对象1:"+hh);
            //getFields()获取的是类和他的超类的所有public fields
            Field[] fields1 = hh.getFields();
            for (Field field : fields1) {
                System.out.println("测试getFields():"+field);
            }
            System.out.println("======================");

            //getDeclaredFields()获取的是类中所有的fields
            Field[] fields2 = hh.getDeclaredFields();
            for (Field field : fields2) {
                System.out.println("测试getDeclaredFields():"+field);
            }
            System.out.println("======================");

            //xx.class    xx是类名
            //getMethods()获取的是类和他的超类所有的public method
            Method[] method1 = HelloController.class.getMethods();
            System.out.println("method111:"+method1);
            for (Method method : method1) {
                System.out.println("测试getMethods:"+method.getName());
            }
            System.out.println("======================");

            // Class.forName("com.springcloud.eurekaclient.controller.HelloController"), 需要全路径类名
            //不然会报classNotFoundException
            Class<?> helloController = Class.forName("com.springcloud.eurekaclient.controller.HelloController");
            //getDeclaredMethods()获取的是类中所有的method
            Method[] method2 = helloController.getDeclaredMethods();
            System.out.println("method222:"+method2);
            for (Method method : method2) {
                System.out.println("测试getDeclaredMethods:"+method.getName());
            }
            System.out.println("======================");

            //利用class对象创建实例对象
            HelloController helloController1 = hh.newInstance();
            System.out.println(helloController1.toString());
            System.out.println("======================");

            //method对象使用invoke调用某个方法  需要是public方法
            Method test11 = hh.getMethod("test11");
            //参数须传入实例对象
            Object invoke = test11.invoke(helloController1);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

运行的结果:

对象1:class com.springcloud.eurekaclient.controller.HelloController
测试getFields():public int com.springcloud.eurekaclient.controller.HelloController.age
测试getFields():public java.lang.String com.springcloud.eurekaclient.controller.Father.identity
======================
测试getDeclaredFields():private java.lang.String com.springcloud.eurekaclient.controller.HelloController.name
测试getDeclaredFields():public int com.springcloud.eurekaclient.controller.HelloController.age
======================
method111:[Ljava.lang.reflect.Method;@4459eb14
测试getMethods:test11
测试getMethods:Hello
测试getMethods:wait
测试getMethods:wait
测试getMethods:wait
测试getMethods:equals
测试getMethods:toString
测试getMethods:hashCode
测试getMethods:getClass
测试getMethods:notify
测试getMethods:notifyAll
======================
method222:[Ljava.lang.reflect.Method;@5a2e4553
测试getDeclaredMethods:test11
测试getDeclaredMethods:Hello
测试getDeclaredMethods:test22
======================
com.springcloud.eurekaclient.controller.HelloController@28c97a5
======================
111

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