使用 属性 占位符位置
Using property placeholder location
我有 database.properties 文件,其中定义了一些属性。
还有 application-context.xml 文件,我试图将这些值放入 databaseRepository bean 属性:
<context:property-placeholder location="file:property_placeholder/database.properties"/>
<bean id="databaseRepository" class="property_placeholder.DatabaseRepository">
<property name="host" value="${host}"/>
<property name="port" value="${port}"/>
<property name="user" value="${user}"/>
<property name="password" value="${password}"/>
</bean>
但是当我尝试 运行 应用程序并读取 database.properties 文件时,我收到以下错误:
Exception in thread "main" org.springframework.beans.factory.BeanInitializationException: Could not load properties; nested exception is java.io.FileNotFoundException: property_placeholder\database.properties (The system cannot find the path specified)
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.postProcessBeanFactory(PropertySourcesPlaceholderConfigurer.java:151)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:265)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:162)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:606)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:462)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at property_placeholder.MainSpring.main(MainSpring.java:9)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.io.FileNotFoundException: property_placeholder\database.properties (The system cannot find the path specified)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(FileInputStream.java:195)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.io.FileInputStream.<init>(FileInputStream.java:93)
at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)
at org.springframework.core.io.UrlResource.getInputStream(UrlResource.java:168)
at org.springframework.core.io.support.EncodedResource.getInputStream(EncodedResource.java:143)
at org.springframework.core.io.support.PropertiesLoaderUtils.fillProperties(PropertiesLoaderUtils.java:98)
at org.springframework.core.io.support.PropertiesLoaderSupport.loadProperties(PropertiesLoaderSupport.java:175)
at org.springframework.core.io.support.PropertiesLoaderSupport.mergeProperties(PropertiesLoaderSupport.java:156)
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.postProcessBeanFactory(PropertySourcesPlaceholderConfigurer.java:142)
... 12 more
文件结构如下:
structure
我哪里做错了?
错误实际上是 FileNotFoundException: property_placeholder\database.properties
,因此请确保您提供正确的属性文件路径。
根据您的结构,正确的路径可能是classpath:property_placeholder/database.properties
。
您需要将文件 database.properties
放在 resources/property_placeholder
下
在您的应用程序上下文文件中使用此配置:将您的属性文件放入资源中。
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>classpath:database.properties</value>
</property>
</bean>
我有 database.properties 文件,其中定义了一些属性。 还有 application-context.xml 文件,我试图将这些值放入 databaseRepository bean 属性:
<context:property-placeholder location="file:property_placeholder/database.properties"/>
<bean id="databaseRepository" class="property_placeholder.DatabaseRepository">
<property name="host" value="${host}"/>
<property name="port" value="${port}"/>
<property name="user" value="${user}"/>
<property name="password" value="${password}"/>
</bean>
但是当我尝试 运行 应用程序并读取 database.properties 文件时,我收到以下错误:
Exception in thread "main" org.springframework.beans.factory.BeanInitializationException: Could not load properties; nested exception is java.io.FileNotFoundException: property_placeholder\database.properties (The system cannot find the path specified)
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.postProcessBeanFactory(PropertySourcesPlaceholderConfigurer.java:151)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:265)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:162)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:606)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:462)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at property_placeholder.MainSpring.main(MainSpring.java:9)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.io.FileNotFoundException: property_placeholder\database.properties (The system cannot find the path specified)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(FileInputStream.java:195)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.io.FileInputStream.<init>(FileInputStream.java:93)
at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)
at org.springframework.core.io.UrlResource.getInputStream(UrlResource.java:168)
at org.springframework.core.io.support.EncodedResource.getInputStream(EncodedResource.java:143)
at org.springframework.core.io.support.PropertiesLoaderUtils.fillProperties(PropertiesLoaderUtils.java:98)
at org.springframework.core.io.support.PropertiesLoaderSupport.loadProperties(PropertiesLoaderSupport.java:175)
at org.springframework.core.io.support.PropertiesLoaderSupport.mergeProperties(PropertiesLoaderSupport.java:156)
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.postProcessBeanFactory(PropertySourcesPlaceholderConfigurer.java:142)
... 12 more
文件结构如下: structure
我哪里做错了?
错误实际上是 FileNotFoundException: property_placeholder\database.properties
,因此请确保您提供正确的属性文件路径。
根据您的结构,正确的路径可能是classpath:property_placeholder/database.properties
。
您需要将文件 database.properties
放在 resources/property_placeholder
在您的应用程序上下文文件中使用此配置:将您的属性文件放入资源中。
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>classpath:database.properties</value>
</property>
</bean>