提问人:mformusic 提问时间:1/15/2015 最后编辑:djvmformusic 更新时间:3/9/2015 访问量:1112
带有 MethodInvokingFactoryBean 的 PropertySourcesPlaceholderConfigurer - 未解析的值
PropertySourcesPlaceholderConfigurer with MethodInvokingFactoryBean - unresolved value
问:
我正在使用 PropertySourcesPlaceholderConfigurer 访问包含 2 个值的文件: key1=值 1 key2=value2。
<bean id="mainProperties"
class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer" id="">
<property name="locations">
<list>
<value>file:datafile.properties</value>
</list>
</property>
</bean>
然后,使用 MethodInvokingFactoryBean 将 datafile.properties 中的值设置为系统属性。
<bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetObject">
<!-- System.getProperties() -->
<bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetClass" value="java.lang.System" />
<property name="targetMethod" value="getProperties" />
</bean>
</property>
<property name="targetMethod"
value="putAll" />
<property name="arguments">
<!-- The new Properties -->
<util:properties>
<prop key="my.key1">${key1}</prop>
<prop key="my.key2">${key2}</prop>
</util:properties>
</property>
</bean>
问题 - ${key1} 和 ${key2} 未解决。我期望这些值将被解析,因为我正在使用 PropertySourcesPlaceholderConfigurer 加载 datafile.properties。有人可以帮忙吗?
答:
0赞
Frantisek Hlavan
3/7/2015
#1
我是春季的初学者。我的解决方案是:
- 文件:
datafile.properties
key1=Hellow
key2=world.
- 根内容.xml 中的配置
<bean id="propertySources"
class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
<property name="locations">
<array>
<value>/WEB-INF/jdbc.properties</value>
<value>/WEB-INF/datafile.properties</value>
</array>
</property>
</bean>
<bean id="sysProps"
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetClass" value="java.lang.System"/>
<property name="targetMethod" value="getProperties"/>
</bean>
<bean id="myNewProps"
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetObject" ref="sysProps"/>
<property name="targetMethod" value="putAll"/>
<property name="arguments">
<map>
<entry key="my.key1" value="${key1}"/>
<entry key="my.key2" value="${key2}"/>
</map>
</property
</bean>
- 在我的中央控制器中:
MainController.java
@RequestMapping(value = "/", method = RequestMethod.GET)
public String home() {
//...
Properties prop = System.getProperties();
String myKey1 = prop.getProperty("my.key1");
String myKey2 = prop.getProperty("my.key2");
System.out.println("\nProperties:\n my.key1 = " + myKey1 +
"\n my.key2 = " + myKey2);
//...
}
控制台输出:
Properties:
my.key1 = Hellow
my.key2 = world.
注意:
使用两个 placeholderConfigurers 时,可能会导致异常: 。每个使用的 placeholderConfigurer 都必须具有不同的占位符。Could not resolve placeholder 'key1' in string value "${key1}"
例如:
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="/WEB-INF/jdbc.properties"/>
</bean>
<!-- default placeholder ${ } -->
<bean id="propertySources"
class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
<property name="locations">
<array>
<value>file:datafile.properties</value>
</array>
</property>
<property name="placeholderPrefix" value="#["></property>
<property name="placeholderSuffix" value="]"></property>
</bean>
<!-- placeholder #[ ] for datafile.properties -->
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