RedirectView的不承認@RequestParam於Spring 4.1

Question

繼春季引導工作的代碼1.1.10（春季4.0.8），但不是在1.2.1（春季4.1.4）

DefaultController.java

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

    @RequestMapping(method= RequestMethod.GET) 
    public RedirectView show(Map<String, Object> model) throws MissingServletRequestParameterException { 
     model.put("req", "expected"); 
     return new RedirectView("redirect"); 
    } 
} 

RedirectController.java

@Controller 
@RequestMapping(value = "/redirect") 
public class RedirectController { 
    private static final Logger logger = LoggerFactory.getLogger(RedirectController.class); 

    @RequestMapping(method= RequestMethod.GET) 
    public String show(@RequestParam("req") String req) throws MissingServletRequestParameterException { 
     logger.info("parameter is {}", req); 
     return "/redirect"; 
    } 
} 

依賴於的build.gradle是以下內容：

dependencies { 
    compile 'org.springframework.boot:spring-boot-starter-thymeleaf:' + version + '.RELEASE' 
    compile 'org.springframework.boot:spring-boot-starter-security:' + version + '.RELEASE' 
} 

集版本爲「1.1.10」它工作正常，但是當設置爲「1.2.1」，會出現一個錯誤信息：

Wed Jan 21 16:13:45 JST 2015 
There was an unexpected error (type=Bad Request, status=400). 
Required String parameter 'req' is not present 

如何使用RedirectView的與彈簧參數4.1.4？

感謝，

Answer 1

您可以使用RedirectAttributes在DefaultController方法是這樣的：

@RequestMapping(method= RequestMethod.GET) 
public RedirectView show(Map<String, Object> model, RedirectAttributes redirectAttributes) throws MissingServletRequestParameterException { 
    redirectAttributes.addAttribute("req","foo"); 
    return new RedirectView("redirect"); 
}