Java 如何在 Spring XML 配置文件类中为 Map 属性指定？
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How to specify in Spring XML configuration file class for a Map property?
提问by Sachin Thapa
Here is what I mean, see following spring XML file:
这就是我的意思，请参阅以下 spring XML 文件：
<bean id = 'a' class="A">
<property name="mapProperty">
<map>
<entry key="key1"><value>value1</value></entry>
</map>
</property>
</bean>
And my class looks like following:
我的课程如下所示：
class A {
HashMap mapProperty
}
How can I tell in spring XML file that Map to be injected is of type java.util.HashMap ? Or in general can I provide class name for the Map ?
如何在 Spring XML 文件中判断要注入的 Map 是 java.util.HashMap 类型？或者一般我可以为 Map 提供类名吗？
Please note, I cannot change the class Ato use Mapinstead of HashMap
请注意，我无法更改class A使用Map而不是HashMap
Thanks in advance !!
提前致谢 ！！
采纳答案by Sotirios Delimanolis
You can use util:map
您可以使用 util:map
<util:map id="someId" map-class="java.util.HashMap">
<entry key="key1">
<value>value1</value>
</entry>
</util:map>
<bean id="a" class="A">
<property name="mapProperty" ref="someId">
</property>
</bean>
Don't forget to add the utilnamespace.
不要忘记添加util命名空间。
回答by Rohit Jain
You can use util:maptag from the utilschema. Here's an example:
您可以使用架构中的util:map标记util。下面是一个例子：
<util:map id="utilmap" map-class="java.util.HashMap">
<entry key="key1" value="value1"/>
<entry key="key2" value="value2"/>
</util:map>
<bean id = 'a' class="A">
<property name="mapProperty" ref="utilmap" />
</bean>
BTW, you should not use raw type HashMap. Use a parameterized type instead - HashMap<String, String>.
顺便说一句，你不应该使用 raw type HashMap。改用参数化类型 - HashMap<String, String>。
回答by dtk
To extend Sotirios Delimanolis' answer: See this exampleon how to include the utilnamespace:
要扩展Sotirios Delimanolis 的回答：请参阅有关如何包含命名空间的示例util：
<?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:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">
</beans>
Note that you will need to amend the schemaLocationas well ;)
请注意，您还需要修改schemaLocation;)
