java - 如何从属性文件获取值以在 springConfig.xml 中输入

Question

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

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

这是错误轨迹

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)

Answer 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 int 并且你试图将它存储为 String 所以你必须像这样说:

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

希望对您有所帮助!