Spring学习之路（三）

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数据注入

• 创建包含所有集合类别的类

package com.collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class Deparment {
    private String name;
//单个字符串属性
    private String[] empname;
//array类型属性
    private List<Employee> emplists;
//list类型属性
    private Set<Employee> empsets;
//set类型属性
    private Map<String,Employee> empmaps;
//map类型属性
    private Properties empporps;
//Properties类型属性    
    public Properties getEmpporps() {
        return empporps;
    }
    public void setEmpporps(Properties empporps) {
        this.empporps = empporps;
    }
    public Set<Employee> getEmpsets() {
        return empsets;
    }
    public List<Employee> getEmplists() {
        return emplists;
    }
    public void setEmplists(List<Employee> emplists) {
        this.emplists = emplists;
    }
    public Map<String, Employee> getEmpmaps() {
        return empmaps;
    }
    public void setEmpmaps(Map<String, Employee> empmaps) {
        this.empmaps = empmaps;
    }
    public void setEmpsets(Set<Employee> empsets) {
        this.empsets = empsets;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String[] getEmpname() {
        return empname;
    }
    public void setEmpname(String[] empname) {
        this.empname = empname;
    }   
}

• 配置applicationContext.xml文件，引入该对象

<bean id="deparment" class="com.collection.Deparment" >
//中间为值配置
</bean>

• 单值注入

<property name="name"  value="人事" />

• array注入

<property name="empname" >
    <list>  
        <value>小明</value>
        <value>大明</value>
    </list>
</property>

• list注入

<-- ref指关联的bean对象 -->
<--  list注入有序且允许值重复 -->
<property name="emplists" >
    <list>
        <ref bean="emp1"/>
        <ref bean="emp2"/>
    </list>
</property>

• set注入

<--  set注入无序且相同值会被覆盖 -->
<property name="empsets" >
    <set>
        <ref bean="emp1"/>
        <ref bean="emp2"/>
    </set>
</property>

• map注入

<--  mapt注入采用键值对的形式，要保证Key不可重复 -->
<--  该entry内属性key，value视情况而选择对应属性表达 -->
<property name="empmaps" >
    <map>
        <entry key="1" value-ref="emp1" />
        <entry key="2" value-ref="emp2" />
    </map>
</property>

• properties注入

<property name="empporps" >
    <props>
        <prop key="1">abcd</prop>
        <prop key="2">abcf</prop>
    </props>
</property>

• Test测试类取出注入的值

package com.collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
    public static void main(String[] args) {
    ApplicationContext ac=new ClassPathXmlApplicationContext("com/collection/beans.xml");
    Deparment deparment=(Deparment) ac.getBean("deparment");

    System.out.println(deparment.getName());
//取出单值
    System.out.println("***************array***************");
    for(String empname:deparment.getEmpname()){
        System.out.println(empname);
    }
//取出数组
    System.out.println("***************list***************");
    for(Employee e:deparment.getEmplists()){
        System.out.println(e.getName());
    }
//取出list    
    System.out.println("***************set***************");
    for(Employee e:deparment.getEmpsets()){
        System.out.println(e.getName());
    }
//取出set
    System.out.println("***************map***************");
    
    System.out.println("map方法");
    for(Entry<String,Employee> e:deparment.getEmpmaps().entrySet()){
        System.out.println(e.getKey()+""+e.getValue().getName());
    }   
    System.out.println("map迭代");
    Map<String,Employee> emp= deparment.getEmpmaps();
    Iterator<String> it=emp.keySet().iterator();
    while(it.hasNext()){
        String key=(String) it.next();
        Employee employee=emp.get(key);
        System.out.println(key+""+employee.getName());  
    }
//取出map
    System.out.println("***************properties***************");
    System.out.println(deparment.getEmpporps().get("1").toString());
//取出properties
    }
}