spring学习笔记 星球日two - 注解方式配置bean

注解要放在要注解的对象的上方

    @Autowired
    private Category category;

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--<bean id="category" class="com.how2java.pojo.Category" aop:id="10" aop:name="kinome"></bean>-->
    <!--&lt;!&ndash; Product 注入 Category对象 &ndash;&gt;-->
    <!--<bean id="product" class="com.how2java.pojo.Product" aop:name="kinome_product" aop:category-ref="category"></bean>-->

    <!-- 注解方式注入对象 -->
    <!--<context:annotation-config></context:annotation-config>-->
    <!--<bean id="category" class="com.how2java.pojo.Category" aop:id="10" aop:name="kinome"></bean>-->
    <!--<bean id="product" class="com.how2java.pojo.Product" aop:name="kinome_product"></bean>-->

    <!-- 完全注解方式配置bean -->
    <!-- 这里指定了bean都在com.how2java.pojo路径下 -->
<context:component-scan base-package="com.how2java.pojo"/>

</beans>

package com.how2java.pojo.test;

import com.how2java.pojo.Category;
import com.how2java.pojo.Product;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestSpring {

    public static void main(String[] args) {

        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
//        Category category = ctx.getBean(Category.class);
//        Category category = (Category) ctx.getBean("category");
//        System.out.println(category.getId()+" "+category.getName());

        Product product = (Product) ctx.getBean("product");
        System.out.println(product.getName()+" "+product.getCategory().getId()+" "+product.getCategory().getName());

    }

}

package com.how2java.pojo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;

@Component
public class Product {
    private int id;
    private String name="kinome_product";

//        @Autowired

//    这里指定了 category 为bean id
//    @Resource(name = "category")
    private Category category;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Category getCategory() {
        return category;
    }
    public void setCategory(Category category) {
        this.category = category;
    }
}

package com.how2java.pojo;

import org.springframework.stereotype.Component;

@Component
public class Category {
    private int id=10;
    private String name="kinome";

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}