SpringIOC随笔（三）-IOC容器

迈不过友情╰ 2022-12-16 14:24 271阅读 0赞

# SpringIOC随笔（三）-IOC容器 #

1.  ### Spring BeanFactory继承关系图 ###

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1.  ### 如何获得容器 ###
    
    1.  单个xml文件
        
        1.      ApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
        2.      applicationContext.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"
                       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
                
                    <bean id="user" class="com.fxyh.ioc.User">
                        <property name="name" value="zhangsan"/>
                        <property name="password" value="123456"/>
                    </bean>
                
                </beans>
    2.  多个xml文件
        
        1.      ApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext-user.xml", "classpath:applicationContext-department.xml");
        2.      applicationContext-department.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"
                       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
                
                    <bean id="department" class="com.fxyh.ioc.Department">
                        <property name="id" value="1"/>
                        <property name="name" value="lisi"/>
                        <property name="location" value="123"/>
                    </bean>
                </beans>
                
                applicationContext-user.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"
                       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
                    <bean id="user" class="com.fxyh.ioc.User">
                        <property name="name" value="zhangsan"/>
                        <property name="password" value="123456"/>
                    </bean>
                </beans>
    3.  如果xml文件很多怎么办，不可能所有都写出来吧那么如下解决办法
        
        1.      ApplicationContext context = new ClassPathXmlApplicationContext("classpath*:applicationContext-*.xml");
        2.  注意：*这里一定不能省略classpath:*\*
        3.  否则容器不会加载模糊匹配的配置文件
    4.  使用import的方法集中到单一xml中
        
        1.      ApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContextImport.xml");
        2.      applicationContextImport.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"
                       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
                
                
                
                    <import resource="classpath*:applicationContext-*.xml"/>
                
                </beans>
        3.  这里import也可以使用模糊匹配，也可以引入单个xml。
    5.  使用FileSystemXmlApplicationContext
        
        1.      String path = url.getPath();
                  path = URLDecoder.decode(path, "UTF-8");
                  ApplicationContext context = new FileSystemXmlApplicationContext(path);
        2.  这里的文件名必须为单个文件。
    6.  使用XmlBeanFactory（**已过时，不建议使用**）
        
        1.  `BeanFactory factory = new XmlBeanFactory(new ClassPathResource("applicationContextImport.xml"));`

### 获取容器的常见的方法都已经列出，其中注意模糊匹配的地方，一定要在前面添加classpath\*:,否则不会使用模糊匹配。 ###

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