java 如何使用 Spring 创建 HashMap bean
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How do I create a HashMap bean using Spring
提问by Ahmad
I'm new to using Spring with Java and I'm trying to instantiate a simple HashMap using Spring's configuration file. I want to know what to put in the Spring config context file to make this work. I know util:mapis somehow used, but all the example codes I'm seeing are either complex instantiations (e.g. for HashMap<Class<?>,List<String>>) from which understanding is difficult, or the author hasn't explained well what he/she has done, leaving me frustrated!
我是将 Spring 与 Java 结合使用的新手，我正在尝试使用 Spring 的配置文件实例化一个简单的 HashMap。我想知道在 Spring 配置上下文文件中放入什么来完成这项工作。我知道util:map以某种方式使用了，但是我看到的所有示例代码要么是复杂的实例化（例如 for HashMap<Class<?>,List<String>>），从中很难理解，要么作者没有很好地解释他/她所做的事情，让我感到沮丧！
What do I need to put in my beans.xml context file if I want to generate a simple HashMap of this specification ? ...
如果我想生成这个规范的简单 HashMap，我需要在我的 beans.xml 上下文文件中放入什么？...
HashMap<Integer, String>
Please show a clear example showing the XML and stating any naming assumptions you're making.
请展示一个清晰的示例，显示 XML 并说明您所做的任何命名假设。
回答by Ryan Pelletier
I am using Spring 4.0.3, you can use this configuration.You can see the key type of the map is Integer, while the value type is String.
我用的是Spring 4.0.3，可以用这个配置。可以看到map的key类型是Integer，value类型是String。
<bean id="map" class="java.util.HashMap" scope="prototype" >
<constructor-arg>
<map key-type="java.lang.Integer" value-type="java.lang.String">
<entry key="1" value="one" />
<entry key="2" value="two" />
</map>
</constructor-arg>
</bean>
An example of getting this bean is the following.
获取此 bean 的示例如下。
public static void main(String[] args){
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Map<Integer,String> map = (HashMap) context.getBean("map");
System.out.println(map);
}`
