Spring -用于空servlet路径的@RequestMapping不起作用

Question

我使用Spring 3.2.2 Web MVC默认注释映射。我使用如下的servlet映射:

<servlet>
    <servlet-name>profil</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextClass</param-name>
        <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
    </init-param>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>de.kicktipp.web.config.servlets.ProfilServletConfig</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>profil</servlet-name>
    <url-pattern>/info/profil/*</url-pattern>
</servlet-mapping>

这是我们的servlet配置:

@Configuration
@ComponentScan("de.kicktipp.controller")
@EnableWebMvc
public class ProfilServletConfig extends WebMvcConfigurerAdapter
{
    @Override
    public void addInterceptors ( InterceptorRegistry registry )
    {
       // we add a few interceptors here
    }
    @Bean
    public DefaultRequestToViewNameTranslator viewNameTranslator ( )
    {
        DefaultRequestToViewNameTranslator defaultRequestToViewNameTranslator = new DefaultRequestToViewNameTranslator();
        defaultRequestToViewNameTranslator.setStripExtension(false);
        defaultRequestToViewNameTranslator.setAlwaysUseFullPath(false);
        defaultRequestToViewNameTranslator.setPrefix("profil/");
        return defaultRequestToViewNameTranslator;
    }
}

通配符匹配很重要，因为我们想用这种模式匹配许多url，如/info/profil/page1, /info/profil/page2等。

当我想匹配没有尾斜杠的"基础"URL /info/profil时，它被servlet"配置文件"拾取。

现在我已经尝试了三种控制器方法来匹配/info/profil与处理程序方法:

@RequestMapping("/")
protected void get1 () {}
@RequestMapping("")
protected void get2 () {}
@RequestMapping("/info/profil")
protected void get3 () {}

只有最后一个有效。这是因为UrlPathHelper#getLookupPathForRequest(javax.servlet.http.HttpServletRequest)如果servlet中的路径是空字符串，则返回应用程序中的完整路径:

public String getLookupPathForRequest(HttpServletRequest request) {
    // Always use full path within current servlet context?
    if (this.alwaysUseFullPath) {
        return getPathWithinApplication(request);
    }
    // Else, use path within current servlet mapping if applicable
    String rest = getPathWithinServletMapping(request);
    if (!"".equals(rest)) {
        return rest;
    }
    else {
        return getPathWithinApplication(request);
    }
}

对于"/info/profile/"的请求，该方法将返回"/"，但对于"/info/profile"(没有尾斜杠)，它将返回"/info/profile"，因为rest变量是空字符串，因此该方法返回pathWithinApplication。

其他路径通常与servlet映射中的路径相匹配(因为总是susefullpath默认为false)。但是"根"路径会与应用程序中的完整路径相匹配(就像当alwaysUseFullPath为true时一样)。

为什么会这样?为什么spring不尝试匹配空字符串，而是尝试匹配应用程序中的路径?

见春季刊https://jira.springsource.org/browse/SPR-10491

Answer 1

尝试添加

@RequestMapping(method = RequestMethod.GET) public String list() { return "redirect:/strategy/list"; }

结果:

    @RequestMapping(value = "/strategy")
    public class StrategyController {
    static Logger logger = LoggerFactory.getLogger(StrategyController.class);
    @Autowired
    private StrategyService strategyService;
    @Autowired
    private MessageSource messageSource;
    @RequestMapping(method = RequestMethod.GET)
    public String list() {
        return "redirect:/strategy/list";
    }   
    @RequestMapping(value = {"/", "/list"}, method = RequestMethod.GET)
    public String listOfStrategies(Model model) {
        logger.info("IN: Strategy/list-GET");
        List<Strategy> strategies = strategyService.getStrategies();
        model.addAttribute("strategies", strategies);
        // if there was an error in /add, we do not want to overwrite
        // the existing strategy object containing the errors.
        if (!model.containsAttribute("strategy")) {
            logger.info("Adding Strategy object to model");
            Strategy strategy = new Strategy();
            model.addAttribute("strategy", strategy);
        }
        return "strategy-list";
    }  

* *学分:

高级@RequestMapping技巧-控制器根和URI模板

和

CRUD教程

Answer 2

[EDIT]

我看到你正在使用annotation mvc配置。在应用程序中，默认映射被配置为"/"路径。要更改这些默认设置，您可以将web.xml编辑为以下模板:

<web-app>
  <!-- Configure ContextLoaderListener to use AnnotationConfigWebApplicationContext
       instead of the default XmlWebApplicationContext -->
  <context-param>
      <param-name>contextClass</param-name>
      <param-value>
          org.springframework.web.context.support.AnnotationConfigWebApplicationContext
      </param-value>
  </context-param>
  <!-- Configuration locations must consist of one or more comma- or space-delimited
       fully-qualified @Configuration classes. Fully-qualified packages may also be
       specified for component-scanning -->
  <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>de.kicktipp.controller.ProfilAppConfig</param-value>
  </context-param>
  <!-- Bootstrap the root application context as usual using ContextLoaderListener -->
  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- Declare a Spring MVC DispatcherServlet as usual -->
  <servlet>
      <servlet-name>dispatcher</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <!-- Configure DispatcherServlet to use AnnotationConfigWebApplicationContext
           instead of the default XmlWebApplicationContext -->
      <init-param>
          <param-name>contextClass</param-name>
          <param-value>
              org.springframework.web.context.support.AnnotationConfigWebApplicationContext
          </param-value>
      </init-param>
      <!-- Again, config locations must consist of one or more comma- or space-delimited
           and fully-qualified @Configuration classes -->
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>de.kicktipp.controller.ProfilServletConfig</param-value>
      </init-param>
  </servlet>
  <!-- map all requests for /info/profil/* to the dispatcher servlet -->
  <servlet-mapping>
      <servlet-name>dispatcher</servlet-name>
      <url-pattern>/info/profil/*</url-pattern>
  </servlet-mapping>
</web-app>

那么，您的应用程序上有de.kicktipp.controller.ProfilServletConfig。只需检查de.kicktipp.controller.ProfilAppConfig (contextClass)的第一个代码块是否真的必要。

来源:Spring Docs