RequestMappingHandlerMapping.getHandlerInternal:230 - 找不到处理程序方法

Question

尝试制作一些 spring 示例程序 - 不断收到错误 - 碰巧我的控制器无法处理 /hello 请求。这是来自 log4j 的调试信息。

    13:50:58,502 {TRACE} DispatcherServlet.initContextHolders:1018 - Bound request context to thread: org.apache.catalina.connector.RequestFacade@636f2067
    13:50:58,503 {DEBUG} DispatcherServlet.doService:823 - DispatcherServlet with name 'springtest' processing GET request for [/springtest_2/hello]
    13:50:58,504 {TRACE} DispatcherServlet.getHandler:1088 - Testing handler map         
[org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping@7bab2c3] in DispatcherServlet with name 'springtest'
    13:50:58,504 {DEBUG} RequestMappingHandlerMapping.getHandlerInternal:220 - Looking          
    up handler method for path /hello
    13:50:58,504 {DEBUG} RequestMappingHandlerMapping.getHandlerInternal:230 - Did not find handler method for [/hello]
    13:50:58,504 {TRACE} DispatcherServlet.getHandler:1088 - Testing handler map [org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping@722e242b] in         DispatcherServlet with name 'springtest'
    13:50:58,505 {TRACE} BeanNameUrlHandlerMapping.getHandlerInternal:127 - No handler mapping found for [/hello]
    13:50:58,505 {WARN} PageNotFound.noHandlerFound:1108 - No mapping found for HTTP request with URI [/springtest_2/hello] in DispatcherServlet with name 'springtest'  
    13:50:58,505 {TRACE} DispatcherServlet.resetContextHolders:1028 - Cleared thread-bound request context: org.apache.catalina.connector.RequestFacade@636f2067
    13:50:58,505 {DEBUG} DispatcherServlet.processRequest:966 - Successfully completed request
    13:50:58,506 {TRACE} XmlWebApplicationContext.publishEvent:332 - Publishing event in WebApplicationContext for namespace 'springtest-servlet': ServletRequestHandledEvent: url=[/springtest_2/hello]; client=[0:0:0:0:0:0:0:1]; method=[GET]; servlet=[springtest]; session=[null]; user=[null]; time=[9ms]; status=[OK]

来自我的项目的 web.xml。

    <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>Spring3-Hibernate DEMO</display-name>

<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

<context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>/WEB-INF/log4j.properties</param-value>
</context-param>

<!-- The front controller of this Spring Web application, responsible for handling all  application requests -->
<servlet>
    <servlet-name>springtest</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/springtest-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<!-- Map all requests to the DispatcherServlet for handling -->
<servlet-mapping>
    <servlet-name>springtest</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>

</web-app>

spring-test-servlet.xml - 我的项目中的调度程序文件

<?xml  version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd 
http://www.springframework.org/schema/tx 
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd" >

<mvc:annotation-driven />

<context:component-scan base-package="com.denmroot.controller"/>

<bean id="viewResolver"     
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
</bean>

ControllerMain.java - 来自我的项目

package com.denmroot.controller;

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

@Controller
public class ControllerMain {

@RequestMapping(value = "/hello", method = RequestMethod.GET)
    public String helloworld (ModelMap model) {
    model.addAttribute("message", "Hello World !!! Spring Output");
    return "hello";     
}

}

Answer 1

对我来说，我在指向包的 Spring 配置文件中有一个错字：

曾经：

<context:component-scan base-package="com.something.web.controlers" />

用正确的拼写修正：

<context:component-scan base-package="com.something.web.controllers" />

Answer 2

ControllerMain.java 需要@Controller 之后的@RequestMapping("/") 语句。

变化：

@Controller
public class ControllerMain {

@RequestMapping(value = "/hello", method = RequestMethod.GET)
....
....

收件人：

@Controller
@RequestMapping("/")
public class ControllerMain {

@RequestMapping(value = "/hello", method = RequestMethod.GET)
....
....
....

Answer 3

其实日志说明了一切：

• 或者将您的 url 从客户端更改为 /hello 路径

• 或将您的@Controller 映射为：

  @Controller
  @RequestMapping("/springtest_2")
  public class ControllerMain {
  

Answer 4

@控制器

您的控制器类缺少注释。