Spring 不同類型的值注入

Spring 不同類型的值注入

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Spring xml注入

構造器注入值

注入對象

public class Person {

    private int id;
    private String name;
    private  int age;

    public Person() {
    }

    public Person(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    getter And Setter
    .....

bean的設置

    <!--  給 person 設置多個別名 -->
    <bean id="person" class="com.test.spring.model.Person" name="#aa,@123,abc" scope="prototype">
        <!-- 構造器設置值  0 ：第一個參數， 1：第二參數，2：第三個參數-->
        <constructor-arg index="0" value="123"/>
        <constructor-arg index="1" value="nice"/>
        <constructor-arg index="2" value="18"/>
    </bean>

測試

 @Test
    public void test001(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean.xml");

        Person person = applicationContext.getBean("person",Person.class);

        System.out.println("id:"+person.getId()+"\n"+"name:"+person.getName()+"\n"+"年齡："+person.getAge());
    }

普通值注入

創建一個Group對象

public class Group {
    private String name;

    public String getName() {
        return name;
    }

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

  <!-- 普通值注入 -->
    <bean id="group" class="com.test.spring.model.Group">
        <property name="name" value="張三"/>
    </bean>

數組,List,Set,Map注入

創建一個USer對象用於數組，List,Set,Map的注入

public class User {
    private String[] name;//數組注入
    private List<Group> groupList;//List注入
    private Set<Group>  groupSet;//Set注入
    private Map<String,Group> groupMap;//Map注入

    public Map<String, Group> getGroupMap() {
        return groupMap;
    }

    public void setGroupMap(Map<String, Group> groupMap) {
        this.groupMap = groupMap;
    }

    ......


}

spring.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:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">

    <!--創建一個bean對象-->
    <!--scope="singleton" 單例模式 ,默認爲單例模式-->
    <!--scope="prototype" 多例模式-->
    <bean name="hello" class="com.zx.spring.model.Hello" scope="prototype">
        <property name="name" value="spring"/>
    </bean>


    <!-- 創建Group對象，用於向List裏面添加對象-->
    <bean name="group1" class="com.zx.spring.model.Group">
        <property name="name" value="group1"></property>
    </bean>
    <bean name="group2" class="com.zx.spring.model.Group">
        <property name="name" value="group2"></property>
    </bean>


    <!-- 數組注入 -->
    <bean name="user" class="com.zx.spring.model.User">
        <property name="name">
            <array>
                <value>戰士</value>
                <value>法師</value>
                <value>弓箭手</value>
            </array>
        </property>

        <!-- List注入 -->
        <property name="groupList">
            <list>
                <ref bean="group1"/>
                <ref bean="group2"/>
            </list>

        </property>

        <!-- set注入 -->
        <property name="groupSet">
            <set>
                <ref bean="group1"/>
                <ref bean="group2"/>
            </set>
        </property>
        <!-- map注入 -->
        <property name="groupMap">
            <map>
                <entry key="g1" value-ref="group1"></entry>
                <entry key="g2" value-ref="group2"></entry>
            </map>
        </property>
    </bean>

</beans>

加載spring.xml注入的對象

 **
 * Spring  IOC(控制反轉)
 * 將控制管理權不由JavaBean管理，交給Spring容器管理
 *
 * DI 依賴注入
 * --分層
 *      --上層依賴於下層
 *      --下層服務於上層
 *
 *
 *
 * Created by Administrator on 2018/1/18.
 */

public class TestSpringh {
    @Test
    public void showUser(){
        BeanFactory beanFactory = new ClassPathXmlApplicationContext("spring.xml");

        User user =  beanFactory.getBean("user",User.class);

        String[] name = user.getName();

        for(int i=0;i<name.length;i++){
            System.out.println(name[i]);
        }

    }
    //list集合
    @Test
    public void showList(){
        BeanFactory beanFactory = new ClassPathXmlApplicationContext("spring.xml");
        User user = beanFactory.getBean("user",User.class);

        List<Group> list = user.getGroupList();

        for(Group grp:list){
            System.out.println(grp.getName());
        }

    }

    //set集合
    @Test
    public void showSet(){
        BeanFactory beanFactory = new ClassPathXmlApplicationContext("spring.xml");
        User user = beanFactory.getBean("user",User.class);
        Set<Group> set = user.getGroupSet();

        for(Group group:set){
            System.out.println(group.getName());
        }
    }
    //Map集合
    @Test
    public void showMap(){
        BeanFactory beanFactory = new ClassPathXmlApplicationContext("spring.xml");
        User user = beanFactory.getBean("user",User.class);
        Map<String,Group> map  = user.getGroupMap();

        //遍歷Map集合
        for (Map.Entry<String,Group> entry:map.entrySet()){
            System.out.println(entry.getKey());
            System.out.println(entry.getValue().getName());
        }
    }