DI注入

 2 
public class Address {
    private String address;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Address{" +
                "address='" + address + '\'' +
                '}';
    }
}

public class Age {
    private int age;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Age{" +
                "age=" + age +
                '}';
    }
}

public class Student {
    private String name;
    /*自动装配*/
//    @Autowired
    private Address address;
//    @Autowired
    private Age age;
    private String[] books;
    private List<String> hobbys;
    private Map<String,String> card;
    private Set<String> games;
    private String wife;
    private Properties info;

    public String getName() {
        return name;
    }

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

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    public Age getAge() {
        return age;
    }

    public void setAge(Age age) {
        this.age = age;
    }

    public String[] getBooks() {
        return books;
    }

    public void setBooks(String[] books) {
        this.books = books;
    }

    public List<String> getHobbys() {
        return hobbys;
    }

    public void setHobbys(List<String> hobbys) {
        this.hobbys = hobbys;
    }

    public Map<String, String> getCard() {
        return card;
    }

    public void setCard(Map<String, String> card) {
        this.card = card;
    }

    public Set<String> getGames() {
        return games;
    }

    public void setGames(Set<String> games) {
        this.games = games;
    }

    public String getWife() {
        return wife;
    }

    public void setWife(String wife) {
        this.wife = wife;
    }

    public Properties getInfo() {
        return info;
    }

    public void setInfo(Properties info) {
        this.info = info;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", address=" + address +
                ", age=" + age +
                ", books=" + Arrays.toString(books) +
                ", hobbys=" + hobbys +
                ", card=" + card +
                ", games=" + games +
                ", wife='" + wife + '\'' +
                ", info=" + info +
                '}';
    }
}

applicationContext.xml  需要加

 http://www.springframework.org/schema/context 2 http://www.springframework.org/schema/context/spring-context.xsd 

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <!--扫描这个包下的类的注解  要在你要 加上注解  Autowired-->
    <context:component-scan base-package="com.rzk.pojo"/>
    <bean id="address" class="com.rzk.pojo.Address">
        <property name="address" value="中国社区"/>
    </bean>

    <bean id="age" class="com.rzk.pojo.Age">
        <property name="age" value="18"/>
    </bean>

    <bean id="student" class="com.rzk.pojo.Student">
        <!--第一种普通值注入-->
        <property name="name" value="小明"/>
        <!--bean注入  ref-->
        <property name="address" ref="address"/>
        <property name="age" ref="age"/>

        <!--数组注入-->
        <property name="books">
            <array>
                <value>西游记1</value>
                <value>西游记2</value>
                <value>西游记3</value>
                <value>西游记4</value>
            </array>
        </property>
        <!--list 注入 -->
        <property name="hobbys">
            <list>
                <value>看电影</value>
                <value>看电影</value>
                <value>看电影</value>
            </list>
        </property>
        <!--Map-->
        <property name="card">
            <map>
                <entry value="1" key="A"/>
                <entry value="2" key="B"/>
                <entry value="3" key="C"/>
            </map>
        </property>
        <!--Set-->
        <property name="games">
            <set>
                <value>lol</value>
                <value>开门狗</value>
                <value>刺客信条</value>
            </set>
        </property>
        <!--null-->
        <property name="wife">
            <null/>
        </property>
        <!--properties-->
        <property name="info">
            <props>
                <prop key="driver">连接</prop>
                <prop key="root">用户</prop>
                <prop key="pwd">密码</prop>
            </props>
        </property>
    </bean>
</beans>

测试

public class Mytest {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        Student student = (Student) context.getBean("student");
        System.out.println(student);

    }
}

 

 

 --------------------------------------------------

加上自动装配  需要在xml添加

 

 在xml配置箭头所指的

 

 加上注解的话可以把xml配置ref    bean注释掉

 

注解就 替换了xml的配置

/*autowired 默认是byType*/

autowire="byType"

autowire="byName"

如果设置了byName 的话会直接找 id
如果设置了byType 的话会直接找 class属性所对应的类名

@Autowired ：自动转配通过类型，名字
 如果Autowired不能通过唯一自动装配上属性，如果想要用byName，则需要通过  @Qualifier(value = "xxx")