下面的例子展示了如何注入

  • List – <list/>
  • Set – <set/>
  • Map – <map/>
  • Properties – <props/>

Spring beans

import java.util.List; 
import java.util.Map; 
import java.util.Properties; 
import java.util.Set; 
   
public class Customer 
{ 
    private List<Object> lists; 
    private Set<Object> sets; 
    private Map<Object, Object> maps; 
    private Properties pros; 
   
    //... 
}

配置文件:

<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> 
   
    <bean id="CustomerBean" class="com.mkyong.common.Customer"> 
   
        <!-- java.util.List --> 
        <property name="lists"> 
            <list> 
                <value>1</value> 
                <ref bean="PersonBean" /> 
                <bean class="com.mkyong.common.Person"> 
                    <property name="name" value="mkyongList" /> 
                    <property name="address" value="address" /> 
                    <property name="age" value="28" /> 
                </bean> 
            </list> 
        </property> 
   
        <!-- java.util.Set --> 
        <property name="sets"> 
            <set> 
                <value>1</value> 
                <ref bean="PersonBean" /> 
                <bean class="com.mkyong.common.Person"> 
                    <property name="name" value="mkyongSet" /> 
                    <property name="address" value="address" /> 
                    <property name="age" value="28" /> 
                </bean> 
            </set> 
        </property> 
   
        <!-- java.util.Map --> 
        <property name="maps"> 
            <map> 
                <entry key="Key 1" value="1" /> 
                <entry key="Key 2" value-ref="PersonBean" /> 
                <entry key="Key 3"> 
                    <bean class="com.mkyong.common.Person"> 
                        <property name="name" value="mkyongMap" /> 
                        <property name="address" value="address" /> 
                        <property name="age" value="28" /> 
                    </bean> 
                </entry> 
            </map> 
        </property> 
   
        <!-- java.util.Properties --> 
        <property name="pros"> 
            <props> 
                <prop key="admin">admin@nospam.com</prop> 
                <prop key="support">support@nospam.com</prop> 
            </props> 
        </property> 
   
    </bean> 
   
    <bean id="PersonBean" class="com.mkyong.common.Person"> 
        <property name="name" value="mkyong1" /> 
        <property name="address" value="address 1" /> 
        <property name="age" value="28" /> 
    </bean> 
   
</beans>

运行:

public class App 
{ 
    public static void main( String[] args ) 
    { 
        ApplicationContext context = new ClassPathXmlApplicationContext("SpringBeans.xml"); 
   
        Customer cust = (Customer)context.getBean("CustomerBean"); 
        System.out.println(cust); 
   
    } 
}

评论关闭
IT干货网

微信公众号号:IT虾米 (左侧二维码扫一扫)欢迎添加!

java中关于如何运行jar格式程序的说明