Spring带有Map构造函数注入示例 _Spring基础

带有地图示例的构造函数注入

在此示例中, 我们使用地图作为具有已发布用户名答案的答案。在这里, 我们将键和值对都用作字符串。
像前面的示例一样, 它是论坛的示例, 其中一个问题可以有多个答案。
Question.java
此类包含三个属性, 两个构造函数和用于显示信息的displayInfo()方法。

package com.srcmini; import java.util.Iterator; import java.util.Map; import java.util.Set; import java.util.Map.Entry; public class Question { private int id; private String name; private Map< String, String> answers; public Question() {} public Question(int id, String name, Map< String, String> answers) { super(); this.id = id; this.name = name; this.answers = answers; }public void displayInfo(){ System.out.println("question id:"+id); System.out.println("question name:"+name); System.out.println("Answers...."); Set< Entry< String, String> > set=answers.entrySet(); Iterator< Entry< String, String> > itr=set.iterator(); while(itr.hasNext()){ Entry< String, String> entry=itr.next(); System.out.println("Answer:"+entry.getKey()+" Posted By:"+entry.getValue()); } } }

applicationContext.xml
map的entry属性用于定义键和值信息。

< ?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:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> < bean id="q" class="com.srcmini.Question"> < constructor-arg value="http://www.srcmini.com/11"> < /constructor-arg> < constructor-arg value="http://www.srcmini.com/What is Java?"> < /constructor-arg> < constructor-arg> < map> < entry key="Java is a Programming Language"value="http://www.srcmini.com/Ajay Kumar"> < /entry> < entry key="Java is a Platform" value="http://www.srcmini.com/John Smith"> < /entry> < entry key="Java is an Island" value="http://www.srcmini.com/Raj Kumar"> < /entry> < /map> < /constructor-arg> < /bean> < /beans>

Test.java
此类从applicationContext.xml文件获取Bean, 然后调用displayInfo()方法。

package com.srcmini; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.xml.XmlBeanFactory; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.Resource; public class Test { public static void main(String[] args) { Resource r=new ClassPathResource("applicationContext.xml"); BeanFactory factory=new XmlBeanFactory(r); Question q=(Question)factory.getBean("q"); q.displayInfo(); } }

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