Spring框架的介绍、搭建、配置详解和注解

public class Workers {
    private String name;
    private String age;

}

 必须要有一个无参的构造函数

书写两个属性的get和set方法并重写toString()

ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); 读取配置文件
Workers workers = (Workers) ac.getBean("workers"); 取出配置文件中的bean类
System.out.println(workers);

<!--
    配置bean元素
      name  给对象起个名字
      class  类的完整路径名
      id: 唯一 里面不能出现特殊字符 struts2  "/sa"
-->   
<bean name="user" class="cn.hd.text.User" id="user"></bean>

<!--scope 对象的创建方式
        singleton 单例模式(默认)  
        prototype  多例模式(什么时候用，什么时候创建 并且创建的方式是每次new ；)
        了解: 坚决不用
        request  web 环境下  对象的生命周期和request一样
        session web环境下  对象的生命周期和session一样
-->
<bean name="user" class="cn.hd.text.User" id="user" scope="prototype"></bean>

默认是单例模式

<bean name="workersFactory" class="cn.hd.text.WorkersFactory" factory-method="createWorkers"></bean>

public static User createUser(){
    System.out.println("静态工厂创建");
    return new User();
}

Workers workers1 = (Workers) ac.getBean("workersFactory");

<bean name="workersFactory1" class="cn.hd.text.WorkersFactory" ></bean>
<bean name="user1" factory-bean="workersFactory1" factory-method="createWorkers1"></bean>

public User createUser1(){
    System.out.println("实例化工厂创建");
    return new User();
}

Workers workers1 = (Workers) ac.getBean("workersFactory");

<bean name="collectionBean" class="cn.hd.injection.CollectionBean">
        <property name="arr" value="1"></property>

<!--数组中的元素只有一个那么它的配置和基本类型一样 -->

如果有多个数据
    <property name="arr">
        <array>
            <value>张三</value>
            <value>李四</value>
            <ref bean="car"></ref>
        </array>
    </property>
</bean>

<!--List集合中只有一个元素配置和基本的一样-->
<property name="list" value="1"></property>

<bean name="collectionBean" class="cn.hd.injection.CollectionBean">
        <property name="list">
        <list>
            <value>王五</value>
            <value>陈六</value>
            <ref bean="user1"></ref>
        </list>
    </property>
</bean>

<bean name="collectionBean" class="cn.hd.injection.CollectionBean">

<property name="map">
    <map>
        <entry key="name" value="赵钱"></entry>
        <entry key="user" value-ref="user2"></entry>
       <!-- <entry key-ref=""></entry>-->
    </map>
</property>

</bean>

<property name="properties">
    <props>
        <prop key="driverClass">com.jdbc://mysql</prop>
        <prop key="driverUrl">jdbc://localhost:3306/...</prop>
        <prop key="user">root</prop>
    </props>
</property>

xmlns:context="http://www.springframework.org/schema/context"

http://www.springframework.org/schema/context
http://www.springframework.org/schema/context.xsd

@Component("user")

//@Controller("user")//web层
//@Service("user") //service 层
//@Repository("user")//dao层

//为了解决所有的bean都是同一个注解，导致层次不清淅，提出了三个新的注解

public class User { 相当于在.xml bean name=user class=cn.hd.annotationUser
    private String name;
    private Integer age;
    private String address;
    private Car car;

}

@Scope(scopeName = "prototype") singleton|prototype 单例(默认)和多例

@Value("张三")
private String name;
@Value("20")
private Integer age;
@Value("河南")
private String address;

// @Autowired //自动装配 如果只有一个对象  自动装配
//    @Qualifier("car2") //自动装配时有多个对象要指定那个对象，与自动装配结合使用
//    @Resource(name = "car")  //直接指定配置那个对象

private Car car;

@PostConstruct
public void init(){
    System.out.println("创建对象后自动执行");
}
@PreDestroy
public void destroy(){
    System.out.println("对象销毁前执行");
}

@RunWith(SpringJUnit4ClassRunner.class)//结合junit测试
@ContextConfiguration("classpath:cn/hd/annotation/applicationContext.xml") //读取配置文件

@Resource(name="user")
private User user;