bean注入demo

最新推荐文章于 2022-11-14 15:33:10 发布

原创最新推荐文章于 2022-11-14 15:33:10 发布 · 415 阅读

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本文通过一个Java示例介绍了如何使用反射和Introspector来获取类的方法和属性信息，并展示了如何设置属性值。

public class TestUser {
	
public static void main(String args [] ) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{
                Class bean = null;
		try {
			bean = Class.forName("inject.User");
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			System.out.println("can't find class");
			e.printStackTrace();
		}  
		BeanInfo info = null;
		try {
			info = Introspector.getBeanInfo(bean);
		} catch (IntrospectionException e) {
			// TODO Auto-generated catch block
			System.out.println("get the information of the class");
			e.printStackTrace();
		}
		// 遍历指定类的方法
		MethodDescriptor[] methods = info.getMethodDescriptors();  
        for (int i = 0; i < methods.length; i++) {  
            System.out.println("方法："+methods[i].getDisplayName());  
        }  
        // 遍历指定类的属性  
        PropertyDescriptor[] propertys = info.getPropertyDescriptors();  
        for (int j = 0; j < propertys.length; j++) {  
            System.out.println("属性："+propertys[j].getName());  
        }  
        
        Object obj = bean.newInstance();
        Method mSet = null;  
        for(int k = 0; k < propertys.length; k++){
        	mSet = propertys[k].getWriteMethod();
        	if(propertys[k].getName().equalsIgnoreCase("name")){
        		mSet.invoke(obj, "mutou");
        		continue;
        	}
        	if(propertys[k].getName().equalsIgnoreCase("password")){
        		mSet.invoke(obj, "mutou_password");
        		continue;
        	}
        }
        User user = (User)obj;
        System.out.println(user.getName());
        System.out.println(user.getPassword());   
	}
}

<pre name="code" class="java">public class User {
	
	String name;
	
	String password;
    //setter getter no paragram constructor
}

输出

方法：notify
方法：wait
方法：setPassword
方法：getClass
方法：getName
属性：class
属性：name
属性：password
mutou
mutou_password

参考资料 http://blog.youkuaiyun.com/zhikun518/article/details/7185499