六、装配bean--给集合装配值

　　对于赋值，一般都是固定值用value，对象引用用ref，置空如下。

<bean id="department" class="com.beans.Department">
        <property name="pp">
            <null></null>
        </property>
    </bean>

 

一、数组的赋值与遍历

赋值

private String[] empName;

<bean id="department" class="com.beans.Department">
        <property name="empName">
            <list>
                <value>蔡文姬</value>
                <value>诸葛亮</value>
                <value>关云长</value>
            </list>
        </property>
    </bean>

遍历

public static void main(String[] args) {
        ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
        Department department=(Department) ac.getBean("department");
        String[] empNames = department.getEmpName();
        for(String emString:empNames){
            System.out.println(emString);
        }
//        for(int i=0;i<empNames.length;i++){
//            System.out.println(empNames[i]);
//        }
    }

 

二、给list注入值，可以重复添加同一对象

赋值

private List<Employee> emps;

<bean id="department" class="com.beans.Department">
        <property name="emps">
            <list>
                <ref bean="emp1"/>
                <ref bean="emp2"/>
            </list>
        </property>
    </bean>
    
    <bean id="emp1" class="com.beans.Employee">
        <property name="name" value="小明"></property>
    </bean>
    <bean id="emp2" class="com.beans.Employee">
        <property name="name" value="小红"></property>
    </bean>

遍历

public static void main(String[] args) {
        ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
        Department department=(Department) ac.getBean("department");
        List<Employee> emps = department.getEmps();
        
        for(Employee e:emps){//list有序，先配置的先打出
            System.out.println(e.getName());
        }
//        for(int i=0;i<emps.size();i++){//list有序，先配置的先打出
//            System.out.println(emps.get(i).getName());
//        }
    }

 

三、给set集合注入值，重复添加同一对象会覆盖

赋值

private Set<Employee> emps;

<bean id="department" class="com.beans.Department">
        <property name="emps">
            <set>
                <ref bean="emp1"/>
                <ref bean="emp2"/>
            </set>
        </property>
    </bean>
    
    <bean id="emp1" class="com.beans.Employee">
        <property name="name" value="小明"></property>
    </bean>
    <bean id="emp2" class="com.beans.Employee">
        <property name="name" value="小红"></property>
    </bean>

遍历

public static void main(String[] args) {
        ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
        Department department=(Department) ac.getBean("department");
        Set<Employee> emps = department.getEmps();
        
        for(Employee e:emps){//set无序,
            System.out.println(e.getName());
        }
        
//        Iterator<Employee> iterator = emps.iterator();
//        while(iterator.hasNext()){
//            Employee e = iterator.next();
//            System.out.println(e.getName());
//        }
}

 

四、给map注入值

赋值

private Map<String, Employee> emps;

<bean id="department" class="com.beans.Department">
        <property name="emps">
            <map>
                <entry key="1" value-ref="emp1"/>
                <entry key="2" value-ref="emp2"/>
            </map>
        </property>
    </bean>
    
    <bean id="emp1" class="com.beans.Employee">
        <property name="name" value="小明"></property>
    </bean>
    <bean id="emp2" class="com.beans.Employee">
        <property name="name" value="小红"></property>
    </bean>

遍历

public static void main(String[] args) {
        ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
        Department department=(Department) ac.getBean("department");
        Map<String, Employee> emps = department.getEmps();
        for(Entry<String, Employee> entry:emps.entrySet()){
            System.out.println(entry.getKey()+" "+entry.getValue().getName());
        }
        
//        Iterator<String> iterator = emps.keySet().iterator();
//        while(iterator.hasNext()){
//            String it = iterator.next();
//            Employee employee = emps.get(it);
//            System.out.println(it+" "+employee.getName());
//        }
    }

 

五、给properties注入值

赋值

private Properties pp;

<bean id="department" class="com.beans.Department">
        <property name="pp">
            <props>
                <prop key="pp1">蔡文姬</prop>
                <prop key="pp2">诸葛亮</prop>
            </props>
        </property>
    </bean>

遍历

public static void main(String[] args) {
        ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
        Department department=(Department) ac.getBean("department");
        Properties pp = department.getPp();
        
        //取出某个属性
        //System.out.println(pp.get("pp1"));
        
        //entry循环取出
        for(Entry<Object, Object> e:pp.entrySet()){
            System.out.println(e.getKey()+" "+e.getValue());
        }
        
//        Enumeration<Object> keys = pp.keys();
//        while(keys.hasMoreElements()){
//            String e = keys.nextElement().toString();
//            System.out.println(e+" "+pp.getProperty(e));
//        }
        
    }