【java】之Method和Field反射获取和设置属性值

packagecom.javaluna.reflect;

importjava.lang.reflect.Field;
importjava.lang.reflect.Method;

importorg.junit.Test;

public classReflectDemo01{
    
    @Test
    public void test0() throwsException{
        Person person=newPerson();
        person.setId(1);
        person.setName("张三");
        person.setAddress("上海");
        Class<? extends Person> c =person.getClass();
        Field[] fields = c.getDeclaredFields();//获取所有属性字段 private public，但是不包含父类
        for(Field f:fields){
            f.setAccessible(true);
            String fieldName=f.getName();
            if(fieldName.equals("address")){
                f.set(person, "北京");//设置属性值
}
            Object fieldVal=f.get(person);//获取属性值
            System.out.println("fieldName = "+fieldName+" fieldVal = "+fieldVal);
        
        }
        //直接获取某个字段值
        Method m=c.getDeclaredMethod("getId");
        System.out.println(m.invoke(person));//获取属性值
        Method m1=c.getDeclaredMethod("setName",String.class);
        m1.invoke(person, "李四");//设置属性值
System.out.println(person.getName());
    }
}

classPerson{
    
    privateInteger id;
    privateString name;
    privateString address;
    
    publicInteger getId() {
        returnid;
    }
    public voidsetId(Integer id) {
        this.id =id;
    }
    publicString getName() {
        returnname;
    }
    public voidsetName(String name) {
        this.name =name;
    }
    publicString getAddress() {
        returnaddress;
    }
    public voidsetAddress(String address) {
        this.address =address;
    }
    
}