如何从属性文件中获取值以输入 springConfig.xml

【问题标题】：How get value from property file to input in springConfig.xml如何从属性文件中获取值以输入 springConfig.xml
【发布时间】：2015-08-30 11:21:14
【问题描述】：

我想获取 email.properties 文件中的属性值以输入到 springConfig.xml 中。但出现错误。

下面是我的代码

springConfig.xml

<bean class="org.springframework.mail.javamail.JavaMailSenderImpl"
    id="mailSender">
    <property name="host" value="${email.host}" />
    <property name="protocol" value="${email.protocol}" />
    <property name="port" value="${email.port}" />
    <property name="username" value="${email.username}"/>
    <property name="password" value="${email.password}" />
    <property name="javaMailProperties">
        <props>
            <prop key="mail.smtp.auth">true</prop>
            <prop key="mail.smtp.starttls.enable">true</prop>
            <prop key="mail.smtp.ssl.trust">smtp.gmail.com</prop>
        </props>
    </property>
</bean>

这是属性文件

email.host=stmp.gmail.com
email.port=465
email.protocol=smtp
email.username=xxx@gmail.com
email.password=xxxxxxxx

这是错误跟踪

Jun 15, 2015 10:46:17 AM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mailSender' defined in class path resource [springConfig.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.lang.String' to required type 'int' for property 'port'; nested exception is java.lang.NumberFormatException: For input string: "${email.port}"
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:547)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:700)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4751)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5175)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.lang.String' to required type 'int' for property 'port'; nested exception is java.lang.NumberFormatException: For input string: "${email.port}"
    at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:479)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:511)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:505)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1502)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1461)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    ... 20 more
Caused by: java.lang.NumberFormatException: For input string: "${email.port}"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:569)
    at java.lang.Integer.valueOf(Integer.java:766)
    at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:155)
    at org.springframework.beans.propertyeditors.CustomNumberEditor.setAsText(CustomNumberEditor.java:113)
    at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:430)
    at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:403)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:181)
    at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:459)
    ... 26 more

Jun 15, 2015 10:46:17 AM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class kh.com.gfam.rsos.listener.InitializeApplicationListner
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mailSender' defined in class path resource [springConfig.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.lang.String' to required type 'int' for property 'port'; nested exception is java.lang.NumberFormatException: For input string: "${email.port}"
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:547)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:700)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4751)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5175)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.lang.String' to required type 'int' for property 'port'; nested exception is java.lang.NumberFormatException: For input string: "${email.port}"
    at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:479)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:511)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:505)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1502)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1461)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    ... 20 more
Caused by: java.lang.NumberFormatException: For input string: "${email.port}"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:569)
    at java.lang.Integer.valueOf(Integer.java:766)
    at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:155)
    at org.springframework.beans.propertyeditors.CustomNumberEditor.setAsText(CustomNumberEditor.java:113)
    at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:430)
    at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:403)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:181)
    at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:459)
    ... 26 more

Jun 15, 2015 10:46:17 AM org.apache.catalina.core.ApplicationContext log
INFO: Set web app root system property: 'webapp.root' = [D:\Sample Project 2 (RSOS)\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\rsos]
Jun 15, 2015 10:46:17 AM org.apache.catalina.core.ApplicationContext log
INFO: Initializing log4j from [D:\Sample Project 2 (RSOS)\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\rsos\WEB-INF\resources\log4j.xml]
log4j:ERROR Could not parse url [file:/D:/Sample%20Project%202%20(RSOS)/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/rsos/WEB-INF/resources/log4j.xml].
java.io.FileNotFoundException: D:\Sample Project 2 (RSOS)\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\rsos\WEB-INF\resources\log4j.xml (The system cannot find the path specified)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:131)
    at java.io.FileInputStream.<init>(FileInputStream.java:87)
    at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
    at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)
    at org.apache.log4j.xml.DOMConfigurator$2.parse(DOMConfigurator.java:765)
    at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:871)
    at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:778)
    at org.apache.log4j.xml.DOMConfigurator.configure(DOMConfigurator.java:906)
    at org.springframework.util.Log4jConfigurer.initLogging(Log4jConfigurer.java:69)
    at org.springframework.web.util.Log4jWebConfigurer.initLogging(Log4jWebConfigurer.java:152)
    at org.springframework.web.util.Log4jConfigListener.contextInitialized(Log4jConfigListener.java:46)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4751)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5175)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

【问题讨论】：

  • 将属性文件中的值放入 springConfig.xml 的逻辑/代码在哪里？

标签： java xml spring-mvc


【解决方案1】：

查看堆栈跟踪的这一行：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mailSender' defined in class path resource [springConfig.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.lang.String' to required type 'int' for property 'port'; nested exception is java.lang.NumberFormatException: For input string: "${email.port}"

它说你的变量 port 必须是一个 int 并且你试图将它存储为一个 String 所以你必须这样写：

<property name="port">${email.port}</property>

希望对你有所帮助！

【讨论】：

    【解决方案2】：

    我认为您必须像这样尝试。在类路径上创建一个属性文件，然后提供对 application-context.xml 的引用。 

    <!-- App Properties -->
<beans:bean id="propertyConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="properties" ref="appProperties" />
</beans:bean>

<bean id="appProperties"
    class="org.springframework.beans.factory.config.PropertiesFactoryBean">
    <property name="singleton" value="true" />
    <property name="ignoreResourceNotFound" value="true" />
    <property name="locations">
        <!-- Note: Properties defined in later files will override properties 
            defined earlier files, in case of overlapping keys. Hence, make sure that 
            the most specific files are the last ones in the given list of locations. -->
        <list>
            <value>classpath:properties/email.properties</value>
        </list>
    </property>
</bean>
<!-- App Properties End -->

    希望以上配置对您有所帮助。:) 如有任何疑问，请告诉我。

    【讨论】：

      【解决方案3】：

      我认为您尚未在 spring 配置 xml 文件中声明 property placeholder。 

      <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

        <property name="location">
            <value>email.properties</value> //location of email.properties file
        </property>
</bean>

      如果您正在使用 Spring 3.1 或更高版本，只需提供 

      <context:property-placeholder location="classpath:email.properties" />

      email.properties 文件应放在 /src/main/resources 下，以便在运行时在类路径中可用。

      This is a nice article on property configuration.

      【讨论】：

      • 我把 springConfig.xml 和 email.properties 文件都放在了资源文件夹中！！我怎么写位置？
      【解决方案4】：

      您忘记设置 PropertyPlaceholderConfigurer，如上所述。您的属性文件似乎在类路径（资源文件夹）中，因此只需添加“类路径：”-“类路径：email.properties”。

      【讨论】：

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