6、IOC操作Bean管理[外部Bean、内部Bean、级联Bean、注入集合类型属性]

a) 注入属性——外部bean
外部bean就是将外部的bean注入到我们需要创建的bean中
1、创建两个类——Service类和dao类
2、在Service调用dao里面的方法

public interface UserDao {
    
    public void update();}

public class UserDaoImpl implements UserDao{
    
    
    @Override
    public void update() {
    
    System.out.println("dao update");}
}

public class UserService {
    
    
    private UserDao userDao;
    public void setUserDao(UserDao userDao) {
    
    this.userDao = userDao;}
    public void add(){
    
    System.out.println("service add......");
        userDao.update();
    }
}


<!--    1、service和dao对象创建-->
    <bean id="userService" class="com.demo.spring5.service.UserService">
<!--    注入userDao对象
        name属性值:类里面属性名称
        ref属性:创建的userDao对象bean标签id值
        -->
        <property name="userDao" ref="userDao"></property>
    </bean>
    <bean id="userDao" class="com.demo.spring5.dao.UserDaoImpl"></bean>


	@Test	//测试方法
    public void testService(){
    
    
        ApplicationContext context=new ClassPathXmlApplicationContext("bean02.xml");
        UserService userService=context.getBean("userService",UserService.class);
        System.out.println(userService);
        userService.add();
    }

b）注入属性——内部bean和级联赋值

• 一、内部bean

（1）一对多关系：部门和员工
一个部门有多个员工，一个员工属于一个部门（部门是一，员工是多）
（2）在实体类之间表示一对多关系，员工表示所属部门，使用对象类型属性进行表示

/*员工类*/
public class Emp {
    
    
    private String ename;
    private String gender;
    private Dept dept;  //员工属于某一个部门，使用对象形式表示
    public void setEname(String ename) {
    
    this.ename = ename; }
    public void setGender(String gender) {
    
    this.gender = gender; }
    public void setDept(Dept dept) {
    
     this.dept = dept;}

    public void tetsdemo(){
    
    
        System.out.println(ename+"::"+gender+"::"+dept.getDname());
    }
}

public class Dept {
    
    
    private String dname;
    public void setDname(String dname) {
    
    this.dname = dname;}
    public String getDname() {
    
     return dname; }
}

@Test
public void testadddept(){
    
    
    ApplicationContext context=new ClassPathXmlApplicationContext("spring-config.xml");
    Emp emp=context.getBean("emp",Emp.class);
    System.out.println(emp);	//com.demo.spring5.dept.Emp@17695df3
      emp.tetsdemo();		//Davidoff::男::国际部门
    }

<bean id="emp" class="com.demo.spring5.dept.Emp">
        <!--设置两个普通属性-->
        <property name="ename" value="Davidoff"></property>
        <property name="gender" value="男"></property>

        <!--设置对象类型属性-->
        <property name="dept">

            <!--内部bean赋值-->
            <bean id="dept" class="com.demo.spring5.dept.Dept">
                <property name="dname" value="国际部门"></property>
            </bean>
        </property>
    </bean>

• 二、级联Bean
  级联Bean和外部Bean有些区别，在引入外部Bean的同时，给外部Bean设置了属性。

<!--方式一:级联-->
<bean id="emp1" class="com.demo.spring5.dept.Emp">
        <property name="ename" value="Andy"></property>
        <property name="gender" value="女"></property>
        <!--级联赋值-->
        <property name="dept" ref="dept"></property>
    </bean>
    <bean id="dept" class="com.demo.spring5.dept.Dept">
        <property name="dname" value="国际模特"></property>
    </bean>

//方式二：生成dept的get方法（get方法必须有！！）
    public Dept getDept() {
    
    
        return dept;
    }
    
<!--级联赋值-->
    <bean id="emp" class="com.atguigu.spring5.bean.Emp">
        <!--设置两个普通属性-->
        <property name="ename" value="jams"></property>
        <property name="gender" value="男"></property>
        <!--级联赋值-->
        <property name="dept" ref="dept"></property>
        <property name="dept.dname" value="技术部门"></property>
    </bean>
    <bean id="dept" class="com.atguigu.spring5.bean.Dept">
    </bean>

c）注入集合类型属性

1. 注入数组类型属性

2. 注入List集合类型属性

3. 注入Map集合类型属性

<bean id="Stu" class="com.demo.spring5.entity.Stu">
    <!--数组类型属性-->
    <property name="courses">
        <array>
            <value>java课程</value>
            <value>数据库课程</value>
        </array>
    </property>

    <!--list类型属性注入-->
    <property name="list">
        <list>
            <value>阿瑞</value>
            <value>阿凡</value>
        </list>
    </property>

    <!--map属性注入-->
    <property name="maps">
        <map>
            <entry key="Java" value="java"> </entry>
            <entry key="PHP" value="php"> </entry>
        </map>
    </property>

    <!--set类型属性注入-->
    <property name="sets">
        <set>
            <value>Mysql</value>
            <value>Redis</value>
        </set>
    </property>
</bean>

public class Stu {
    
    
    private String[] courses;
    private List<String> list;
    private Map<String,String> maps;
    private Set<String> sets;
    
    public void setCourses(String[] courses) {
    
    this.courses = courses;}
    public void setList(List<String> list) {
    
    this.list = list;}
    public void setMaps(Map<String, String> maps) {
    
    this.maps = maps;}
    public void setSets(Set<String> sets) {
    
    this.sets = sets;}
    public void test(){
    
    
        System.out.println(Arrays.toString(courses));
        System.out.println(list);
        System.out.println(maps);
        System.out.println(sets);
    }
}

public class TestMain {
    
    
    @Test
    public void test01(){
    
    
        ApplicationContext context=new ClassPathXmlApplicationContext("bean01.xml");
        Stu stu=context.getBean("Stu",Stu.class);
        System.out.println(stu);
        stu.test();
    }
}

/*
com.demo.spring5.entity.Stu@281e3708
[java课程, 数据库课程]
[阿瑞, 阿凡]
{Java=java, PHP=php}
[Mysql, Redis]
*/

4、在集合里面设置对象类型值

public class Course {
    
    
    private String cname;

    public void setCname(String cname) {
    
    
        this.cname = cname;
    }

}

//学生所学的多门课程
private List<Course> liCourse;

	<bean id="student" class="com.demo.collection.Student">
        <property name="liCourse">
            <list>
                <ref bean="course1"></ref>
                <ref bean="course2"></ref>
            </list>
        </property>
    </bean>

    <!--创建多个course对象-->
    <bean id="course1" class="com.demo.collection.Course">
        <property name="cname" value="Spring5框架课程"></property>
    </bean>
    <bean id="course2" class="com.demo.collection.Course">
        <property name="cname" value="Mybatis框架课程"></property>
    </bean>

5、把集合注入部分提取出来

(1)、在Spring配置文件中引入名称空间util
xmlns:util=“http://www.springframework.org/schema/util”
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
(2)、使用util标签，完成list集合注入提取出来

public class Course {
    
    
    private String cname;
    public void setCname(String cname) {
    
    
        this.cname = cname;
    }
}

public class Book {
    
    
    private List<String> list;
    public void setList(List<String> list) {
    
    
        this.list = list;
    }
}


<?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:util="http://www.springframework.org/schema/util"	<!--添加util-->
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd	<!--添加util-->
                           ">

<!--  提取lis集合类型属性注入  -->

    <util:list id="booklist">
        <value>book01</value>
        <value>book02</value>
        <value>book03</value>
    </util:list>


    <!--  提取lis集合类型属性注入使用  -->
    <bean id="book" class="com.demo.collection.Book">
        <property name="list" ref="booklist"></property>
    </bean>
	
	@Test
    public void Test02(){
    
    
        ApplicationContext context=new ClassPathXmlApplicationContext("bean01.xml");
        Book book=context.getBean("book",Book.class);
        book.Test();    //[book01, book02, book03]
    }