我正在尝试设置我的应用程序以使用Spring以及一个服务于servlet的图像。我查看了其他帖子并找到了类似的主题,但似乎无法使我的配置正常工作。我使用Spring 3.0并使用tomcat 7作为我的app服务器。这是我的配置:
<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/app-context.xml</param-value>
</context-param>
<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Processes application requests -->
<servlet>
<servlet-name>viewer</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet>
<servlet-name>imageServlet</servlet-name>
<servlet-class>com.billy.viewer.servlet.ImageServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/imageServlet/imgServlet-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>viewer</servlet-name>
<url-pattern>/web/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>imageServlet</servlet-name>
<url-pattern>/images/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>list.jsp</welcome-file>
</welcome-file-list>
servlet的context.xml中
<!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->
<!-- Enables the Spring MVC @Controller programming model -->
<annotation-driven />
<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
<resources mapping="/resources/**" location="/resources/" />
<!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/WEB-INF/views/" />
<beans:property name="suffix" value=".jsp" />
</beans:bean>
<!-- Imports user-defined @Controller beans that process client requests -->
<beans:import resource="controllers.xml" />
<beans:bean id="imageService" class="com.billy.viewer.service.ImageService"></beans:bean>
displayImage.jsp在正文中包含了这个
<img alt="Test" src="/images/${image.imageId}">
ImageServlet
public class ImageServlet extends HttpServlet {
private static final int DEFAULT_BUFFER_SIZE = 10240;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int imageId = Integer.valueOf(request.getPathInfo().substring(1));
System.out.println("Image id: "+imageId);
}
}
我的页面很好,我可以看到img标签上方的其他输出,但图像永远不会出现。我没有从servelt看到我的system.out.println的Image id。我的控制台中没有错误消息。
任何建议将不胜感激。感谢
答案 0 :(得分:2)
一切似乎都很好。用firebug检查图像请求的实际响应是什么(或尝试用浏览器打开它)。
我觉得很奇怪你有imgServlet-context.xml
。
顺便说一句,没有必要使用servlet来执行此操作。您可以安全地将调度程序servlet映射到/*
,并使用弹簧控制器来处理@RequestMapping("/images/{id}")
。
当您指定网址时,最好使用src="<c:url value="/images/${..}" />"
- 这将解析相对于当前上下文的网址。另一种选择是使用相对路径 - 即src="images/${..}"
答案 1 :(得分:1)
将标准标记库中的c:url标记用于img和其他URL,这些URL应该是您的Web应用程序上下文相关的。您使用“/images/${image.imageId}”指定的URL,因为前导“/”指向根上下文或/ images上下文而不是您的Web应用程序上下文,并且仅当您将Web应用程序部署为根上下文时它才有效。使用c:url它将始终有效,当app是root并且它是非root上下文时。