java - 将 *-servlet.xml 与 applicationContext.xml 混合

Question

我有一个现有的 Spring 应用程序，它执行一些服务器端处理。我正在尝试为这个特定的应用程序创建一个 webapp，并选择 SpringMVC 来实现我的目的。

我创建了一个显示 Controller ，如下所示:

@Controller
@RequestMapping("/items")
public class ItemDisplayController {
    private static final Logger LOGGER = Logger.getLogger(ItemDisplayController.class);
    private static final String ITEMS_REDIRECT = "redirect:/item/items";

    @Autowired
    private ItemDisplay itemDisplay;

    @RequestMapping
    public String listItems(ModelMap model) {
        if (LOGGER.isInfoEnabled()) {
            LOGGER.info("List all items");
        }

        List<ItemDetail> itemDetails = itemDisplay.getAllItems();
        model.addAttribute("itemDetails",itemDetails);
        return "items";
    }
}

我已经有一个包含以下定义的 applicationContext 文件:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
                           http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <bean id="props" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="locations">
            <array>
                <value>classpath:item.properties</value>
                <value>file:#{systemEnvironment['ITEM_HOME']}/item.properties</value>
                <value>file:#{systemProperties['ITEM_HOME']}/item.properties</value>
            </array>
        </property>
        <property name="ignoreResourceNotFound" value="true"/>
    </bean>


    <bean id="itemDisplay" class="com.acme.itemDisplayImpl">
           <property name="itemDisplayDAO" ref="jdbcItemDisplayDAO"/>
       </bean>

    <bean id="jdbcItemDisplayDAO" class="com.acme.database.dao.JdbcItemDisplayDAO">
        <property name="dataSource" ref = "dataSource"/>
    </bean>


    <bean id="realDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="#{props['itemds.jdbc.driver']}"/>
        <property name="url"><value><![CDATA[#{props['itemds.jdbc.url']}]]></value></property>
        <property name="username" value="#{props['itemds.username']}"/>
        <property name="password" value="#{props['itemds.password']}"/>
        <property name="testOnBorrow" value="#{props['itemds.test.on.borrow']}"/>
        <property name="testWhileIdle" value="#{props['itemds.test.while.idle']}"/>
        <property name="poolPreparedStatements" value="#{props['itemds.pool.prepared.statements']}"/>
        <property name="validationQuery" value="#{props['itemds.validation.query']}"/>
        <property name="validationQueryTimeout" value="#{props['itemds.validation.query.timeout']}"/>
        <property name="timeBetweenEvictionRunsMillis" value="#{props['itemds.time.between.eviction.runs.millis']}"/>
        <property name="maxActive" value="#{props['itemds.max.active']}"/>
        <property name="maxIdle" value="#{props['itemds.max.idle']}"/>
        <property name="initialSize" value="#{props['itemds.initial.size']}"/>
    </bean>

    <bean id="dataSource" class="org.springframework.jdbc.datasource.LazyConnectionDataSourceProxy">
        <property name="targetDataSource" ref="realDataSource"/>
    </bean>

</beans>

在我的 *servlet.xml 中，我定义了 ViewResolver，如下所示:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                           http://www.springframework.org/schema/context
                           http://www.springframework.org/schema/context/spring-context-3.0.xsd
                           http://www.springframework.org/schema/mvc
                           http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <mvc:annotation-driven/>
    <context:annotation-config/>
    <context:component-scan base-package="com.acme.item"/>

    <bean id="primaryViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
        <property name="contentType" value="text/html; charset=UTF-8"/>
        <property name="order" value="1"/>
    </bean>
</beans>

在 web.xml 中，我定义了上下文参数:

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
              http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         version="2.5"
         xmlns="http://java.sun.com/xml/ns/javaee">
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>items</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>items</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

当我运行我的应用程序时，itemDisplay 没有连接，在调试器上它显示为空值。

有人可以指出我在这里可能做错了什么吗？在理想情况下，我假设在 Controller 中使用 @Autowired 注释 itemDisplay 将有助于解决接口(interface)的实现。

Answer 1

我唯一能想到的是，如果找不到applicationContext.xml，ContextLoaderListener不会提示，让我们试试这个添加类路径*:applicationContext.xml 还要确保 applicationContext.xml 是服务器的运行时类路径

这是一篇很好的文章，可以很好地了解 spring classpath资源。