Spring MVC 缺少 URI 模板变量

Question

我有一个Controller 类，它具有将记录保存到数据库的功能。我将几个参数传递给Controller 函数，但是我想我可能写错了@RequestMapping。下面是代码

控制器

 @RequestMapping(value="createRoadBlock.htm", method = RequestMethod.POST)
 public @ResponseBody Integer createRoadBlock(@RequestParam String purpose, @RequestParam String userName,
                                              @RequestParam  int status, @RequestParam double latAdd,
                                              @RequestParam double longAdd, HttpServletRequest request,  
                                              HttpServletResponse response) {

         int roadBlockId = 0;
        try{

            roadBlockId = roadBlockManager.saveRoadBlock(purpose, userName, status,latAdd,longAdd);
            logger.info("Create Road Block Successful roadBlockId "+ roadBlockId);

            return roadBlockId;

        }catch(Exception e){
            logger.error("Exception Occured In Road Block Controller "+e.getMessage());
            return roadBlockId;

        } 

     }

Ajax 请求

$.ajax({
    type:'POST',
    url:'createRoadBlock.htm',
    contentType:"application/json",
    async:false,
    cache:false,
        data:{purpose:f_purpose, userName:f_userName,status: f_status,latAdd: f_latAdd, longAdd:f_lngAdd},
    dataType:'json'

    }).success(function(recordId){ 
                console.log('Road Block created with id ' + recordId);
    });

错误日志

Controller [com.crimetrack.web.RoadBlockController]
Method [public java.lang.Integer com.crimetrack.web.RoadBlockController.createRoadBlock(java.lang.String,java.lang.String,int,double,double,javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)]

org.springframework.web.bind.MissingServletRequestParameterException: Required String parameter 'purpose' is not present
    at org.springframework.web.method.annotation.RequestParamMethodArgumentResolver.handleMissingValue(RequestParamMethodArgumentResolver.java:201)
    at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:90)
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:75)
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:156)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:117)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)

Answer 1

当您在 REST 定义中定义的映射变量与 @PathVariable 名称不匹配时，可能会发生此错误。

示例： 假设你在 REST 定义中定义了

@GetMapping(value = "/{appId}", produces = "application/json", consumes = "application/json")

那么在定义函数的时候，应该是

public ResponseEntity<List> getData(@PathVariable String appId)

当您将 REST 控制器定义中定义的任何其他变量与 @PathVariable 一起使用时，可能会发生此错误。 就像，下面的代码将引发错误，因为 ID 与 appId 变量名不同：

public ResponseEntity<List> getData(@PathVariable String ID)

Answer 2

我犯了一个愚蠢的错误，@PathVariable 中的变量名与@RequestMapping 中的不匹配

例如

@RequestMapping(value = "/whatever/{**contentId**}", method = RequestMethod.POST)
public … method(@PathVariable Integer **contentID**){
}

它可以帮助别人

Answer 3

@PathVariable 用于告诉 Spring URI 路径的一部分是您想要传递给您的方法的值。这是您想要的，还是应该是发布到 URI 的表单数据的变量？

如果您需要表单数据，请使用@RequestParam 而不是@PathVariable。

如果你想要@PathVariable，你需要在@RequestMapping条目中指定占位符来告诉Spring路径变量在URI中的位置。例如，如果您想提取名为contentId 的路径变量，您可以使用：

@RequestMapping(value = "/whatever/{contentId}", method = RequestMethod.POST)

编辑：此外，如果您的路径变量可能包含“.”并且您想要那部分数据，那么您需要告诉 Spring 抓取所有内容，而不仅仅是 '.' 之前的内容：

@RequestMapping(value = "/whatever/{contentId:.*}", method = RequestMethod.POST)

这是因为 Spring 的默认行为是将 URL 的该部分视为文件扩展名，并将其从变量提取中排除。