Question

我只是春季MVC的新手以下是我的代码，当我尝试去bye时出现以下错误

Could not find @PathVariable [pathVars] in @RequestMapping Spring MVC

以下是我的代码

package com.springapp.mvc;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import java.util.Map;

@Controller
public class HelloController {
    @RequestMapping("/")
    public String printWelcome(ModelMap model) {
        model.addAttribute("message", "Hello world!");
        return "hello";
    }
    @RequestMapping("/runThis/{bye}/{hye}")
    public ModelAndView printBye(@PathVariable Map<String,String> pathVars) {
        String Bye =  pathVars.get("bye");
        String Hye =  pathVars.get("hye");
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("message", "you are"+Bye+ "AND Here COmes" +Hye+"!");
        return modelAndView;
    }
}

编辑完整堆栈。

type Exception report

message Request processing failed; nested exception is org.springframework.web.bind.annotation.support.HandlerMethodInvocationException: Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView com.springapp.mvc.HelloController.printBye(java.util.Map)]; nested exception is java.lang.IllegalStateException: Could not find @PathVariable [pathVars] in @RequestMapping

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.web.bind.annotation.support.HandlerMethodInvocationException: Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView com.springapp.mvc.HelloController.printBye(java.util.Map)]; nested exception is java.lang.IllegalStateException: Could not find @PathVariable [pathVars] in @RequestMapping
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:723)

root cause

org.springframework.web.bind.annotation.support.HandlerMethodInvocationException: Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView com.springapp.mvc.HelloController.printBye(java.util.Map)]; nested exception is java.lang.IllegalStateException: Could not find @PathVariable [pathVars] in @RequestMapping
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:180)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:723)

root cause

java.lang.IllegalStateException: Could not find @PathVariable [pathVars] in @RequestMapping
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.resolvePathVariable(AnnotationMethodHandlerAdapter.java:859)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolvePathVariable(HandlerMethodInvoker.java:710)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:359)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:170)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:723)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.43 logs.

Answer 1

您的dispatcher-servlet config xml

中需要<mvc:annotation-driven/>

或在春季使用的后期版本

弹簧配置类中的

@EnableWebMvc注释

请理解@EnableWebMvc取代mvc：annotation-driven

并确保

中的xmlns正确无误

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
                    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd     
                    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
                    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">

Answer 2

而不是代码中的这个：

public ModelAndView printBye(@PathVariable Map<String,String> pathVars) {

将其更改为：

public ModelAndView printBye(@RequestParam Map<String,String> pathVars) {

这是因为@RequestParam用于处理传递给参数的Map对象，而@PathVariable用于处理传递给参数的各个项目。以下是@PathVariable：

的示例

public ModelAndView printBye(@PathVariable("bye") String Bye, @PathVariable("hye") String Hye) {

Answer 3

根据您的请求映射，您表明您的网址包含固定部分/runThis/和两个可变部分{bye}和{hye}，并且您希望它们映射到您方法的两个参数（使用匹配的名称，因为您没有指明任何其他内容）。

但是在您的方法中，您声明了一个名为pathVars的参数。因此，您的名称，类型和参数数量不匹配。这就是Spring MVC所抱怨的。

所以你想要的是：

@RequestMapping("/runThis/{bye}/{hye}")
public ModelAndView printBye(@PathVariable String bye, @PathVariable String hye) {
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.addObject("message", "you are" + bye + "AND Here COmes" + hye + "!");
    return modelAndView;
}

它比您的代码更简单，更安全。请阅读文档。这是一个非常基本的例子。

Answer 4

在某些情况下，如果ModelAndView（jspPageName）语句中的jspPageName

指向不存在的页面，您将收到相同的错误

注意我使用Spring mvc 4.2.4和JDK 8

在@RequestMapping Spring MVC中找不到@PathVariable [pathVars]

4 个答案: