java - 异常 java.lang.NoSuchMethodError

Question

我正在尝试在服务器中上传 pdf 文件。我在 Controller 中使用以下代码块:

 @RequestMapping(value = /submit, method = RequestMethod.POST)
 public String upload(UploadItem uploadItem, BindingResult result, HttpServletRequest request, HttpSession session) {

   //some code here

   String name = request.getServletContext().getRealPath("/pdf/" + filename);
   File dest = new File(name);
   try {
        file.transferTo(dest);
   }catch(Exception e){
        System.err.println(e);
   }

   return "redirect:/details";

我这样做是为了将 pdf 存储到 pdf 文件中。在我的本地主机上工作正常但是当我在服务器上执行此操作时出现以下异常:

exception

org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.getServletContext()Ljavax/servlet/ServletContext;
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:839)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

root cause

java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.getServletContext()Ljavax/servlet/ServletContext;
frontend.controller.EsteemRatingsController.handleFormUpload(EsteemRatingsController.java:113)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

如果我删除上面在 Controller 类中提供的行(当然没有上传 pdf)。谁能帮我解决这个问题？

Answer 1

该方法 request.getServletContext() 是在 servlet 3.0 中引入的。确保您的容器/库支持该版本。

编辑:tomcat 6 只有 servlet 2.5，参见 http://tomcat.apache.org/whichversion.html

它可以 Autowiring :ServletContext and Spring MVC

public class Xxxx{
    @Autowired
    ServletContext context;

    @RequestMapping(value = "/submit", method = RequestMethod.POST)
    public String upload(UploadItem uploadItem, BindingResult result, HttpServletRequest request, HttpSession session) {

       //some code here

       String name = context.getRealPath("/pdf/" + filename);
...