Spring-Bean的依赖注入的数据类型

Spring-Bean的依赖注入的数据类型

除了对象的引用可以注入，普通数据类型，集合等都可以在容器中进行注入

数据的三种数据类型

• 普通数据类型
• 引用数据类型
• 集合数据类型

普通数据类型

• public class UserDaoImpl implements UserDao {
  private String username;
  private int age;

  public void setUsersname(String usersname) {
  this.username = usersname;
  }

  public void setAge(int age) {
  this.age = age;
  }
  public void save() {
  System.out.println(username);
  System.out.println(age);
  System.out.println("save running.....");
  }
  }

xml核心配置文件

   <bean id="userDao" class="com.my.UserDaoImpl">
        <property name="age" value="123"/>
        <property name="usersname" value="zhangsan"/>
   </bean>
    <bean id="userService" class="com.my.service.UserImplService">
    <!--这里的name是构造函数里面的参数userDao ref为容器中Bean的ID-->
    <constructor-arg name="userDao" ref="userDao"></constructor-arg>
    </bean>

测试

public class UserDemo {
    @Test
    public  void mytest(){
        ApplicationContext application = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userDao1 = (UserService) application.getBean("userService");
        userDao1.save();
    }
}

集合数据类型

   private Properties properties;

set方法

public void setProperties(Properties properties) {
        this.properties = properties;
    }

xml配置文件

<bean id="userDao" class="com.my.UserDaoImpl">
     <property name="properties">
         <props>
               <prop key="p1">pppp2</prop>
              <prop key="p2">pppp3</prop>
              <prop key="p3">pppp4</prop>
         </props>
     </property>
</bean>

引用数据类型之map

声明变量

private Map<String, User> userMap;

Map里面的set方法

package com.my.domain;

public class User {
    private String name;
    private  String addr;
    public String getName() {
        return name;
    }

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

    public String getAddr() {
        return addr;
    }

    public void setAddr(String addr) {
        this.addr = addr;
    }
    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", addr='" + addr + '\'' +
                '}';
    }
}

MapXML配置文件（重点）

     <bean id="userDao" class="com.my.UserDaoImpl">
         <property name="userMap">
             <map>
                 <!--第一个key为map的key-->
                 <entry key="u1" value-ref="user1"/>
                 <entry key="u2" value-ref="user2"/>
             </map>
         </property>
     </bean>
        <bean id="user1" class="com.my.domain.User">
        <property name="name" value="qwertyu"/>
        <property name="addr" value="beijing"/>
     </bean>
    <bean id="user2" class="com.my.domain.User">
        <property name="name" value="qwj"/>
        <property name="addr" value="luvy"/>
    </bean>

测试

public class UserDemo {

    @Test
    public  void mytest(){
        ApplicationContext application = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userDao1 = (UserService) application.getBean("userService");
        userDao1.save();
    }
}

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