java - Spring MVC 无法解析 View 名称

Question

我正在编写一个应用程序，我希望能够将其打包到单个可执行 Jar 中，并使用嵌入式 Web 服务器来提供 REST API 和使用 API 的一组配置页面(允许 API由服务器外部的其他客户端访问，例如 Android 应用程序)。

到目前为止，我有一个基本的 REST API 可以正常工作，但在将它用于 View 时仍然遇到问题，我已尝试按照指南 here 进行操作并且无法获得解析为 JSP 页面的 View 名称。这里有一些日志行似乎表明它无法解决它:

15:37:23.559 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Looking up handler method for path /UserPage
15:37:23.560 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Did not find handler method for [/UserPage]
15:37:23.561 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Matching patterns for request [/UserPage] are [/**]
15:37:23.561 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - URI Template variables for request [/UserPage] are {}
15:37:23.562 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Mapping [/UserPage] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.ResourceHttpRequestHandler@37f9ecb0] and 1 interceptor
15:37:23.563 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/UserPage] is: -1
15:37:23.564 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.resource.ResourceHttpRequestHandler - Trying relative path [UserPage] against base location: ServletContext resource [/]
15:37:23.564 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.resource.ResourceHttpRequestHandler - Trying relative path [UserPage] against base location: class path resource [META-INF/resources/]
15:37:23.565 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.resource.ResourceHttpRequestHandler - Trying relative path [UserPage] against base location: class path resource [resources/]
15:37:23.565 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.resource.ResourceHttpRequestHandler - Trying relative path [UserPage] against base location: class path resource [static/]
15:37:23.566 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.resource.ResourceHttpRequestHandler - Trying relative path [UserPage] against base location: class path resource [public/]
15:37:23.566 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.resource.ResourceHttpRequestHandler - No matching resource found - returning 404

我有一种感觉，因为我正在尝试使用嵌入式 Tomcat 服务器运行它(而不是将其部署到 Tomcat 服务器)，所以我错过了配置 /webapp/ 目录的步骤作为一个网络应用程序，但我对 Spring 还很陌生，所以我不确定我错过了什么。

src/main/webapp/web.xml:

<web-app id="WebApp_ID" version="2.4" 
xmlns="http://java.sun.com/xml/ns/j2ee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<display-name>IeNoTenshi</display-name>
<description>IeNoTenshi internal webserver</description>

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

<servlet-mapping>
    <servlet-name>mvc-dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
</context-param>

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

src/main/webapp/WEB-INF/mvc-dispatcher-servlet.xml

<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"
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">

<context:component-scan base-package="com.dan_nixon.ienotenshi.web.service" /> 
<mvc:annotation-driven/>

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/pages/" />
    <property name="suffix" value=".jsp" />
</bean>

</beans>

src/com/dan_nixon/.../web/service/UsersController.java

@Controller
@RequestMapping("/service")
public class UsersController {
private static final Logger log = LoggerFactory.getLogger(UsersController.class);
public static final int DEFAULT_COUNT = 10;

@RequestMapping(method=RequestMethod.GET)
public String test(ModelMap model) {
    model.addAttribute("username", "test");
    model.addAttribute("name", "Test User");
    return "UserPage";
}

@RequestMapping(value="/user/{user_id}", method=RequestMethod.GET)
public @ResponseBody ModelAndView getUser(@PathVariable long user_id,
        Model model) {
    INTObjectDB db = new INTObjectDB();
    db.open();
    User user = db.getUser(user_id);
    user.getPermissions();
    db.close();
    ModelAndView mav = new ModelAndView();
    mav.setViewName("UserPage");
    mav.addObject("username", user.getUsername());
    mav.addObject("name", user.getName());
    log.error(String.format("%s", mav));
    return mav;
}

Answer 1

出现这个错误信息

15:37:23.559 [http-nio-8080-exec-1] DEBUG org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Looking up handler method for path /UserPage

看来你正在尝试访问类似的东西

localhost:8080/yourApp/UserPage

但是您显然没有映射到该 URL 的处理程序方法。您拥有的是映射到处理 GET 请求的 /service 的处理程序方法

@RequestMapping(method=RequestMethod.GET)
public String test(ModelMap model) {
    model.addAttribute("username", "test");
    model.addAttribute("name", "Test User");
    return "UserPage";
}

您应该将请求发送至

localhost:8080/yourApp/service