在Spring MVC中，我怎樣才能讓@RequestMapping工作？

Question

在Spring 3 MVC中，我有一個控制器，我稱之爲RolesController，它具有用於顯示角色列表（saveRole（）和deleteRole（））的諸如displayRoles（）等方法。

目前，我成功使用@RequestMapping註釋來路由/ settings/roles /以調用displayRoles（）方法，/ settings/roles/save /來調用saveRole（）方法等等。

我的代碼如下，它的工作原理。

@Controller 
public class RolesController { 

    @Transactional 
    @RequestMapping(value = {"settings/roles/save"}, method = {RequestMethod.POST}) 
    public ModelAndView saveRole(details removed){ 
     //details removed 
    } 

    @RequestMapping(value = {"settings/roles/delete"}, method = {RequestMethod.POST}) 
    public ModelAndView deleteRole(details removed){ 
     //details removed 
    } 

    @RequestMapping(value = {"settings/roles"}, method = RequestMethod.GET) 
    public ModelAndView displayRoles(details removed){ 
     //details removed 
    } 

} 

有2個問題，我一直沒能解決，但：

1. 我一直無法映射父目錄/settings/調用displayRoles（）方法。如果我將displayRoles方法的映射更改爲@RequestMapping(value = {"settings","settings/","settings/roles"}, method = RequestMethod.GET)，然後重新生成並瀏覽到URL中的/設置，則會出現404錯誤。爲什麼我無法映射到「設置」父文件夾？
2. URL中的尾部斜槓似乎是必需的。例如，轉到設置/角色/作品，但訪問設置/角色會導致404頁面未找到錯誤。

我在做什麼錯？謝謝！ -Ryan

---

P.S.下面是一些額外的信息...的情況下，這會有所幫助：

在我的applicationContext-mvc.xml文件，我有（其中包括代碼）：

<!-- Maps request paths to @Controller classes; e.g. a path of /login looks for a controller named LoginController --> 
<bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"> 
    <property name="order" value="1" /> 
</bean>  
<!-- If no @Controller match, look for @RequestMapping match--> 
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"> 
    <property name="order" value="2" /> 
    <property name="defaultHandler"> 
     <!-- If no @RequestMapping match, map path to a view to render; e.g. the "/intro" path would map to the view named "intro" --> 
     <bean class="org.springframework.web.servlet.mvc.UrlFilenameViewController" /> 
    </property> 
</bean> 

Answer 1

嘗試以下...

@Controller 
    @RequestMapping("/settings/roles") 
    public class RolesController { 

     @Transactional 
     @RequestMapping(value = "/save", method = RequestMethod.POST) 
     public ModelAndView saveRole(details removed){ 
      //details removed 
     } 

Answer 2

對於尾部斜線問題，這可能是一個版本細節：有一些尾隨s （見http://jira.springframework.org/browse/SPR-7064和https://issues.springsource.org/browse/SPR-5636），它們在Spring 3.0.3和更高版本中被標記爲固定的。

對於/settings映射問題，你可能需要做一些像@Bill那樣：

@Controller 
@RequestMapping(value = {"/settings"}) 
public class RolesController { 

    @Transactional 
    @RequestMapping(value = {"/roles/save"}, method = {RequestMethod.POST}) 
    public ModelAndView saveRole(details removed){ 
     //details removed 
    } 

    @RequestMapping(value = {"/roles/delete"}, method = {RequestMethod.POST}) 
    public ModelAndView deleteRole(details removed){ 
     //details removed 
    } 

    @RequestMapping(value = {"/","/roles"}, method = RequestMethod.GET) 
    public ModelAndView displayRoles(details removed){ 
     //details removed 
    } 
} 

Answer 3

如上所述，可能已被錯誤使用舊版本，但因爲沒有答案似乎被接受，這是什麼適用於我...

它幫助我創建一個indexAction（）與可選的斜槓作爲給定的控制器的默認操作。在這種情況下，displayRoles（）可以被用作默認：

@RequestMapping(value = {"", "/"}, method = RequestMethod.GET) 
public ModelAndView displayRoles(details removed) { 
    //details removed 
} 

如果/設置和/設置/角色應該指的是相同的方法，那麼這樣的事情解決了這個問題：

@Controller 
@RequestMapping(value = "/settings") 
public class RolesController { 

    @Transactional 
    @RequestMapping(value = {"/roles/save"}, method = {RequestMethod.POST}) 
    public ModelAndView saveRole(details removed) { 
     //details removed 
    } 

    @RequestMapping(value = {"/roles/delete"}, method = {RequestMethod.POST}) 
    public ModelAndView deleteRole(details removed) { 
     //details removed 
    } 

    @RequestMapping(value = {"", "/", "/roles", "/roles/"}, method = RequestMethod.GET) 
    public ModelAndView displayRoles(details removed) { 
     //details removed 
    } 
} 

適用於Spring 4.0.7。