Spring_通过注解实现IOC和DI

 要先配置一个注解模板spring-context-2.5.xsd

复制最后一个：

http://www.springframework.org/schema/context/spring-context-2.5.xsd

Eclipse里window - preferences - XML catalog - add 输入spring-context-2.5.xsd路径 - key type改第二个 - key里粘贴http://www.springframework.org/schema/context/spring-context-2.5.xsd

在上面手册里复制：xmlns:context="http://www.springframework.org/schema/context" 到xml文件抬头中去，再把手册中的：

http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-2.5.xsd

复制进去，就有提示了。（这些在手册里都是黑体加粗）

配置完context是这样的：

通过注解实现IOC

鸡的类：

package cn.java.annotationioc;

import org.springframework.stereotype.Component;

@Component("smallJi") //就等于在xml中写了一个<bean id="smallJi" class="路径">
public class JI {
    public void behavior() {
        System.out.println("打鸣");
    }
}

鸡的xml：

<?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/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-2.5.xsd">

    <!-- 配置注解驱动与包扫描 -->
    <!-- 
    context:component-scan:组件扫描 (前置通知后置通知每一部分都是一个组件)
    base-package:会扫描包下所有java类中带有@Component的都会交给spring管理
    -->
    <context:component-scan base-package="cn.java.annotationioc"></context:component-scan>

</beans>

主方法：

package cn.java.annotationioc;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Window {

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        JI ji = (JI) context.getBean("smallJi");
        ji.behavior();
    }

}

设置单例多例：

package cn.java.annotationioc;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

@Component("smallJi") //就等于在xml中写了一个<bean id="smallJi" class="路径">
@Scope("singleton") //设置了单例，value设置了prototype就是多例
public class JI {
    public void behavior() {
        System.out.println("打鸣");
    }
}

通过注解实现DI

通过主方法调用Ji类为Duck类中方法赋值：

Duck.xml

<?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/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-2.5.xsd">

    <!-- 配置注解驱动与包扫描 -->
    <!-- 
    context:component-scan:组件扫描 (前置通知后置通知每一部分都是一个组件)
    base-package:会扫描包下所有java类中带有@Component的都会交给spring管理
    -->
    <context:component-scan base-package="cn.java.annotationioc"></context:component-scan>

</beans>

Duck.java

package cn.java.annotationioc;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

@Component("ya")//在bean中创建ya
public class Duck {
    private String duckName;
    private Integer duckAge;
    public String getDuckName() {
        return duckName;
    }
    public void setDuckName(String duckName) {
        this.duckName = duckName;
    }
    public Integer getDuckAge() {
        return duckAge;
    }
    public void setDuckAge(Integer duckAge) {
        this.duckAge = duckAge;
    }
    @Override
    public String toString() {
        return "Duck [duckName=" + duckName + ", duckAge=" + duckAge + "]";
    }
    
            
}

Ji.java

package cn.java.annotationioc;

import javax.annotation.Resource;

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

@Component("smallJi") //在bean中创建smallJi
public class Ji {
    //@Resource(name="ya") //与Duck类保持一致
    @Autowired //自动捆绑到Duck类
    private Duck duck;

    public void behavior() {
        duck.setDuckName("唐老鸭");
        duck.setDuckAge(20);
        System.out.println(duck);
    }

    
}

主方法：

package cn.java.annotationioc;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Window {

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        Ji ji = (Ji) context.getBean("smallJi");
        ji.behavior();
    }

}