如何在调度程序中导入上下文文件 servlet.xml
how to import contexts file in dispatcher servlet.xml
我创建了一个maven多模块项目，它们是MVCLayer、ServiceLayer和DAOLayer。
在 DAOLayer 中，我在 src/main/resources 下有 applicationContext.xml，如下所示
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:annotation-config />
<context:component-scan base-package="com.sharique" />
<tx:annotation-driven />
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>/DB.properties</value>
</property>
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
<property name="driverClassName" value="${JDBC.DRIVERCLASSNAME}" />
<property name="url" value="${JDBC.URL}" />
<property name="username" value="${USERNAME}" />
<property name="password" value="${PASSWORD}" />
<!-- <property name="initialSize" value="2" /> <property name="maxActive"
value="5" /> -->
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.sharique.domainObjects" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${HIBERNATE.DAILECT}</prop>
<prop key="hibernate.hbm2ddl.auto">${HBM2DDL.AUTO.UPDATE}</prop>
<prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop>
</props>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory"></bean>
</beans>
在 ServiceLayer 中，serviceContext.xml 在 src/main/resources 下面，如下所示
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:annotation-config />
<context:component-scan base-package="com.sharique" />
<tx:annotation-driven />
<import resource="classpath*:/applicationContext.xml"/>
<!-- <bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>DB.properties</value>
</property>
</bean> -->
<!-- <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
<property name="driverClassName" value="${JDBC.DRIVERCLASSNAME}" />
<property name="url" value="${JDBC.URL}" />
<property name="username" value="${USERNAME}" />
<property name="password" value="${PASSWORD}" />
<property name="initialSize" value="2" /> <property name="maxActive"
value="5" />
</bean> -->
<!-- <bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.sharique.domainObjects" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${HIBERNATE.DAILECT}</prop>
<prop key="hibernate.hbm2ddl.auto">${HBM2DDL.AUTO.UPDATE}</prop>
<prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop>
</props>
</property>
</bean> -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory"></bean>
</beans>
而在MVCLayer中，WEB-INF下的MVC-Dispatcher-servlet.xml如下
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package="com.sharique.controller" />
<mvc:annotation-driven />
<import resource="classpath*:/serviceContext.xml"/>
<bean id="ViewResolver"
class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass">
<value>org.springframework.web.servlet.view.JstlView</value>
</property>
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
Sp 完成所有这些配置后，当我从 eclipse 运行 tomcat 中的项目 MVCLayer 时，我收到此错误。
SEVERE: Allocate exception for servlet MVC-Dispatcher
java.io.FileNotFoundException: Could not open ServletContext resource
[/DB.properties] at
org.springframework.web.context.support.ServletContextResource.getInputStream(ServletContextResource.java:141)
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.beans.factory.config.PropertyResourceConfigurer.postProcessBeanFactory(PropertyResourceConfigurer.java:80)
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.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663)
at
org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:629)
at
org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:677)
at
org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:548)
at
org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489)
at
org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
at javax.servlet.GenericServlet.init(GenericServlet.java:160) at
org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1189)
at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1103)
at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:813)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
当我通过创建 main class 从 ServiceLayer 执行 crud 操作时，它工作正常但是每当 运行 MVCLayer 时，我都会收到此错误
所以请帮我看看如何配置它
MVCLayer pom.xml 如下所示
<?xml version="1.0"?>
<project
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.test</groupId>
<artifactId>Roomies</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>MVCLayer</artifactId>
<packaging>war</packaging>
<name>MVCLayer Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp.jstl</groupId>
<artifactId>javax.servlet.jsp.jstl-api</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>javax.servlet.jsp.jstl</artifactId>
<version>1.2.1</version>
<exclusions>
<!-- jstl-api was adding selvlet-api 2.5 and jsp-api -->
<exclusion>
<artifactId>jstl-api</artifactId>
<groupId>javax.servlet.jsp.jstl</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.test</groupId>
<artifactId>ServiceLayer</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<finalName>MVCLayer</finalName>
</build>
</project>
看来你在添加到项目的类路径中有问题
您可以交替地在 WEB-INF 或 web.xml 中导入
这样做
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/dispatcher-servlet.xml,
/WEB-INF/spring-mail.xml,
</param-value>
</context-param>
您似乎遇到了路径问题，Spring 找不到您的 DB.properties
SEVERE: Allocate exception for servlet MVC-Dispatcher
java.io.FileNotFoundException: Could not open ServletContext resource
[/DB.properties]
...
由于您在 servlet 容器中 运行 this，以下目录将在您的类路径中：
WEB-INF/classes
WEB-INF/lib
部署您的应用程序时，DB.properties 需要位于这两个位置之一（最好位于它们的根目录，因为您的映射是 /Db.properties）。如果您使用标准的 Maven 项目结构，src/main/resources，只需确保您的 DB.properties 在该资源目录中。
我创建了一个maven多模块项目，它们是MVCLayer、ServiceLayer和DAOLayer。
在 DAOLayer 中，我在 src/main/resources 下有 applicationContext.xml，如下所示
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:annotation-config />
<context:component-scan base-package="com.sharique" />
<tx:annotation-driven />
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>/DB.properties</value>
</property>
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
<property name="driverClassName" value="${JDBC.DRIVERCLASSNAME}" />
<property name="url" value="${JDBC.URL}" />
<property name="username" value="${USERNAME}" />
<property name="password" value="${PASSWORD}" />
<!-- <property name="initialSize" value="2" /> <property name="maxActive"
value="5" /> -->
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.sharique.domainObjects" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${HIBERNATE.DAILECT}</prop>
<prop key="hibernate.hbm2ddl.auto">${HBM2DDL.AUTO.UPDATE}</prop>
<prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop>
</props>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory"></bean>
</beans>
在 ServiceLayer 中，serviceContext.xml 在 src/main/resources 下面，如下所示
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:annotation-config />
<context:component-scan base-package="com.sharique" />
<tx:annotation-driven />
<import resource="classpath*:/applicationContext.xml"/>
<!-- <bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>DB.properties</value>
</property>
</bean> -->
<!-- <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
<property name="driverClassName" value="${JDBC.DRIVERCLASSNAME}" />
<property name="url" value="${JDBC.URL}" />
<property name="username" value="${USERNAME}" />
<property name="password" value="${PASSWORD}" />
<property name="initialSize" value="2" /> <property name="maxActive"
value="5" />
</bean> -->
<!-- <bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.sharique.domainObjects" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${HIBERNATE.DAILECT}</prop>
<prop key="hibernate.hbm2ddl.auto">${HBM2DDL.AUTO.UPDATE}</prop>
<prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop>
</props>
</property>
</bean> -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory"></bean>
</beans>
而在MVCLayer中，WEB-INF下的MVC-Dispatcher-servlet.xml如下
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package="com.sharique.controller" />
<mvc:annotation-driven />
<import resource="classpath*:/serviceContext.xml"/>
<bean id="ViewResolver"
class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass">
<value>org.springframework.web.servlet.view.JstlView</value>
</property>
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
Sp 完成所有这些配置后，当我从 eclipse 运行 tomcat 中的项目 MVCLayer 时，我收到此错误。
SEVERE: Allocate exception for servlet MVC-Dispatcher java.io.FileNotFoundException: Could not open ServletContext resource [/DB.properties] at org.springframework.web.context.support.ServletContextResource.getInputStream(ServletContextResource.java:141) 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.beans.factory.config.PropertyResourceConfigurer.postProcessBeanFactory(PropertyResourceConfigurer.java:80) 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.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:629) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:677) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:548) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) at javax.servlet.GenericServlet.init(GenericServlet.java:160) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1189) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1103) at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:813) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)
当我通过创建 main class 从 ServiceLayer 执行 crud 操作时，它工作正常但是每当 运行 MVCLayer 时，我都会收到此错误 所以请帮我看看如何配置它
MVCLayer pom.xml 如下所示
<?xml version="1.0"?>
<project
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.test</groupId>
<artifactId>Roomies</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>MVCLayer</artifactId>
<packaging>war</packaging>
<name>MVCLayer Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp.jstl</groupId>
<artifactId>javax.servlet.jsp.jstl-api</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>javax.servlet.jsp.jstl</artifactId>
<version>1.2.1</version>
<exclusions>
<!-- jstl-api was adding selvlet-api 2.5 and jsp-api -->
<exclusion>
<artifactId>jstl-api</artifactId>
<groupId>javax.servlet.jsp.jstl</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.test</groupId>
<artifactId>ServiceLayer</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<finalName>MVCLayer</finalName>
</build>
</project>
看来你在添加到项目的类路径中有问题 您可以交替地在 WEB-INF 或 web.xml 中导入 这样做
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/dispatcher-servlet.xml,
/WEB-INF/spring-mail.xml,
</param-value>
</context-param>
您似乎遇到了路径问题，Spring 找不到您的 DB.properties
SEVERE: Allocate exception for servlet MVC-Dispatcher java.io.FileNotFoundException: Could not open ServletContext resource [/DB.properties]
...
由于您在 servlet 容器中 运行 this，以下目录将在您的类路径中：
WEB-INF/classes
WEB-INF/lib
部署您的应用程序时，DB.properties 需要位于这两个位置之一（最好位于它们的根目录，因为您的映射是 /Db.properties）。如果您使用标准的 Maven 项目结构，src/main/resources，只需确保您的 DB.properties 在该资源目录中。