commons-beanUtils工具中 BeanUtils.copyProperties出来的值全都是null。

Question

为什么总是显示null，

public static void main(String[] args) throws IllegalAccessException, InvocationTargetException {
        Map<String, String> map = new HashMap<String, String>();
        map.put("name", "lis");
        map.put("age", "21");
        musy ui = new musy();
        BeanUtils.copyProperties(ui, map);
        System.out.println(ui.getName());
    }
}

class musy {
    private String name;
    private String age;

    public musy() {
        super();
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
}

Answer 1

是因为内部类的问题，你把这个类在外部建个新类就可以了