5、依赖注入

5.1、构造器注入

前面已经说过了

5.2、set方法注入

• 依赖注入：set 注入

  • 依赖：Bean对象的从创建依赖于容器

  • 注入：Bean所有对象的属性，由容器来注入

环境搭建：

public class Student
{
    private String name;
    private Address address;
    private String[] books;
    private List<String> hobbys;
    private Map<String,String> card;
    private Set<String> games;
    private String wife;
    private Properties info;

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

public class Address {
    private  String address;

    public String getAddress() {
        return address;
    }

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

• 第一种注入方法：value值注入

  <bean id="student" class="com.an.pojo.Student" >
 <!--            第一种注入方式 value值进行注入-->
             <property name="name" value="张三"></property>
          </bean>

• 第二种方式：Bean注入

  <!--            第二种注入方式 Bean注入-->
              <property name="address" ref="address"></property>
              

• 数组注入

  <!--            数组注入-->
              <property name="books">
                  <array>
                      <value>红楼梦</value>
                      <value>水浒传</value>
                      <value>三国演义</value>
                      <value>西游记</value>
                  </array>
              </property>

• List集合注入

  <!--            list集合注入-->
              <property name="hobbys">
                  <list>
                      <value>唱歌</value>
                      <value>跳舞</value>
                      <value>篮球</value>
                  </list>
              </property>

   

• Map注入

  <!--            Map注入-->
              <property name="card" >
                  <map>
                      <entry key="身份证" value="111111111111111"></entry>
                      <entry key="卡号" value="1231231231231231"></entry>
                  </map>
              </property>

• Set集合注入

  <!--            set集合注入-->
              <property name="games">
                <set>
                    <value>LOL</value>
                    <value>CF</value>
                </set>
              </property>

• Properties注入

  <!--            Properties注入-->
              <property name="info">
                  <props>
                      <prop key="url">jdbc:mysql://localhost:3306</prop>
                      <prop key="username">root</prop>
                      <prop key="password">123456</prop>
                  </props>

•  

5.3、扩展方法注入

• P命名空间注入 直接注入值

  引入P命名空间： xmlns:p="http://www.springframework.org/schema/p"

  <?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.xsd">
  
      <beans>
          <bean id="user" class="com.an.pojo.User" p:name="张三" p:age="18"></bean>
      </beans>
  
  
  </beans>

• C命名空间注入 通过构造器进行注入 需要有有参构造器

• 引入C命名空间 xmlns:c="http://www.springframework.org/schema/c"

  <bean id="user2" class="com.an.pojo.User" c:name="李四" c:age="20"></bean>