Spring MVC中的@RequestParam处理可选参数 [英] @RequestParam in Spring MVC handling optional parameters

问题描述

弹簧控制器是否可以处理这两种请求？

Is it possible for a spring controller to handle both kind of requests?

1) http://localhost:8080/submit/id/ID123432?logout=true
2) http://localhost:8080/submit/id/ID123432?name=sam&password=543432

如果我定义了一种类型的控制器：

If I define a single controller of the kind:

 @RequestMapping (value = "/submit/id/{id}", method = RequestMethod.GET,   
 produces="text/xml")
public String showLoginWindow(@PathVariable("id") String id,
                              @RequestParam(value = "logout", required = false) String logout,
                              @RequestParam("name") String username,
                              @RequestParam("password") String password,
                              @ModelAttribute("submitModel") SubmitModel model,
                              BindingResult errors) throws LoginException {...}

不接受带有注销的HTTP请求。

the HTTP Request with "logout" is not accepted.

如果我定义两个控制器来处理eac h单独请求，Spring抱怨异常已经有'Controller'bean方法...映射。

If I define two controllers to handle each request separately, Spring complains with the exception "There is already 'Controller' bean method ... mapped".

推荐答案

你需要为 name 和密码请求 required = false 参数也是如此。那是因为，当你只提供 logout 参数时，它实际上需要 name 和密码以及它们仍然是强制性的。

You need to give required = false for name and password request parameters as well. That's because, when you provide just the logout parameter, it actually expects for name and password as well as they are still mandatory.

当你刚给 name 时，它有效和密码因为 logout 不是强制性参数，这要归功于 required = false 已经为退出。

It worked when you just gave name and password because logout wasn't a mandatory parameter thanks to required = false already given for logout.

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