學(xué)習(xí)Spring的核心之一的IOC容器 詳細(xì)內(nèi)容總結(jié)

<!--創(chuàng)建對象、自動裝配
    bean標(biāo)簽里面的autowire屬性：
        屬性值：byName:根據(jù)屬性名字注入值，id的值必須與類里面的屬性名稱一樣
              byType:根據(jù)屬性的類型注入值。
-->
<bean id="employee" class="tianfei.Spring5.autowire.Employee" autowire="byType">
    <!--手動裝配-->
    <!--<property name="dept" ref="dept"></property>-->
</bean>

public class User {
    
        private Integer id;
        private String name;
    
        public User() {
        }
    
        public User(Integer id, String name) {
            this.id = id;
            this.name = name;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public void setAddress(String address) {
            this.address = address;
        }
    }

<!--1、配置User對象
       id：為創(chuàng)建后的對象名，可自取
       class：為類的全路徑
  -->
<bean id="user" class="tianfei.Spring5.User">
    <!--2、通過set方法注入屬性
            通過property注入屬性
                 name ：類里面的屬性
                 value ：類里面屬性對應(yīng)的值
    -->
    <property name="id" value="1"></property>
    <property name="name" value="田飛"></property>

    <!--通過有參構(gòu)造注入屬性-->
    <constructor-arg name="id" value="2"></constructor-arg>
    <constructor-arg name="name" value="張三"></constructor-arg>

    <!--通過p名稱空間注入屬性
         使用前，需在xml標(biāo)簽屬性中加入：xmlns:p="http://www.springframework.org/schema/p"
    -->
    <bean id="user" class="tianfei.Spring5.User" p:id="1" p:name="李四"></bean>
</bean>

public class testDemo {
    @Test
    public void test() {
        //1、加載Spring5 的xml配置文件
        ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");

        //2、獲取配置創(chuàng)建的對象
        User user = context.getBean("usera", User.class);

        System.out.println(user);
    }
}

<!--引入外部文件  jdbc.properties
        需在名稱空間中加入：xmlns:context="http://www.springframework.org/schema/context"
    -->
    <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>

    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" >
        <property name="driverClassName" value="${prop.driverClassName}"></property>
        <property name="url" value="${prop.url}"></property>
        <property name="username" value="${prop.username}"></property>
        <property name="password" value="${prop.password}"></property>
    </bean>

prop.driverClassName=com.mysql.jdbc.Driver
prop.url=jdbc:mysql://localhost:3306/userdb
prop.username=root
prop.password=tianfei

public interface UserDao {
          public void add();
    }
        @Controller(value = "userDaoImpl")
    public class UserDaoImpl implements UserDao {
    
        @Override
        public void add() {
            System.out.println("userdao add.......");
        }
    
        public UserDaoImpl() {
        }
    }

//value屬性可以省略，如果省略則默認(rèn)創(chuàng)建的對象名為  類名首字母小寫  對象
@Service(value = "userService")
public class UserService {
    //基于注解注入基本類型數(shù)據(jù)
    @Value(value = "abc")
    private String str;

    //基于注解注入對象類型值
//    @Autowired  //根據(jù)類型注入
//    @Qualifier(value = "userDaoImpl")  //根據(jù)名稱注入 需要和 Autowired 一起使用
//    private UserDao userDao;

//    @Resource   //根據(jù)類型注入
    @Resource(name = "userDaoImpl")  //根據(jù)名稱注入
    private UserDao userDao;

    public void add() {
        System.out.println("service add........");
        userDao.add();
    }

    public void test() {
        System.out.println("userDao = " + userDao);
        System.out.println(str);
    }
}

public class test {
    @Test
    public void test1(){
        //測試使用注解創(chuàng)建對象
        //需要在mxl配置文件中配置：<context:component-scan base-package="tianfei.Spring5"></context:component-scan> ，來開啟注解掃描組件
        //不需要添加set方法
        ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");

        UserService userService = context.getBean("userService", UserService.class);

        System.out.println(userService);
        userService.add();
        userService.test();
    }
    @Test
    public void test2(){
        //測試使用注解創(chuàng)建對象
        //不需要添加set方法
        //使用完全注解
        ApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);

        UserService userService = context.getBean("userService", UserService.class);

        System.out.println(userService);
        userService.add();
        userService.test();
    }
}

@Configuration      //作為配置類，代替xml配置文件，進(jìn)行完全注解開發(fā)
@ComponentScan(value = {"tianfei.Spring5"})
public class SpringConfig {
}

 public class MyBean implements FactoryBean<User> {

    //用來改變返回對象（返回的對象可以和創(chuàng)建的對象不一樣）
    @Override
    public User getObject() throws Exception {
        return new User(1,"張三");
    }

    @Override
    public Class<?> getObjectType() {
        return null;
    }

    @Override
    public boolean isSingleton() {
        return false;
    }
}

<!--創(chuàng)建類的對象-->
<bean id="myBean" class="tianfei.Spring5.factorybean.MyBean"></bean>

   public class test {

    @Test
    public void testMyBean() {
        //測試 FactoryBean 工廠
        ApplicationContext context = new ClassPathXmlApplicationContext("MyBean.xml");

        Book book = context.getBean("myBean",Book.class);
        System.out.println(book);
    }
}