hello world 应用程序的 Spring MVC Web 应用程序中的 HTTP 404 错误代码答案

【问题标题】：HTTP 404 error code in spring MVC web app for hello world apphello world 应用程序的 Spring MVC Web 应用程序中的 HTTP 404 错误代码
【发布时间】：2016-07-14 02:16:42
【问题描述】：

我正在尝试实现一个简单的 Spring MVC Web 应用程序。我在 Eclipse 中构建了一个项目在通过 tomcat 部署期间，我遇到了这个错误。

错误代码：

文件夹结构 Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <display-name>Theka Desi Khana</display-name>
  <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/root-context.xml</param-value>
    </context-param>

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Processes application requests -->
    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
     <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

根上下文.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    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.xsd">


</beans>

servlet-context.xml

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

    <!-- DispatcherServlet Context: defines this servlet's request-processing 
        infrastructure -->

    <context:component-scan base-package="com.theka.desi.Controllers" />



    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->

     <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean> 


    <!-- Handles HTTP GET requests for /resources/** by efficiently serving 
        up static resources in the ${webappRoot}/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />    




</beans:beans>

家庭控制器

   package com.theka.desi.Controllers;


import javax.servlet.ServletContext;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
@RequestMapping("/")
public class HomeController {
    @Autowired
    private ServletContext servletContext;
    private final Logger logger = Logger.getLogger(HomeController.class);

    public ServletContext getServletContext() {
        return servletContext;
    }

    public void setServletContext(ServletContext servletContext) {
        this.servletContext = servletContext;
    }



    @RequestMapping("/")
        public String welcome() {
            return "redirect:/home";
        }

        @RequestMapping("/home")
        public ModelAndView home() {
            ModelAndView view = new ModelAndView("index");

            return view;
        }






}

控制台日志：

   Mar 26, 2016 6:09:56 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.j2ee.server:desi' did not find a matching property.
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server version:        Apache Tomcat/7.0.65
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server built:          Oct 9 2015 08:36:58 UTC
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server number:         7.0.65.0
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Name:               Windows 8.1
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Version:            6.3
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Architecture:          amd64
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Java Home:             C:\Program Files\Java\jdk1.7.0_79\jre
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Version:           1.7.0_79-b15
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Vendor:            Oracle Corporation
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_BASE:         C:\Users\nand\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_HOME:         G:\Softy\apache-tomcat-7.0.65-windows-x64\apache-tomcat-7.0.65
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.base=C:\Users\nand\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.home=G:\Softy\apache-tomcat-7.0.65-windows-x64\apache-tomcat-7.0.65
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dwtp.deploy=C:\Users\nand\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Djava.endorsed.dirs=G:\Softy\apache-tomcat-7.0.65-windows-x64\apache-tomcat-7.0.65\endorsed
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dfile.encoding=Cp1252
Mar 26, 2016 6:09:56 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.7.0_79\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Git\cmd;C:\Program Files (x86)\Git\bin;C:\Program Files (x86)\Common Files\lenovo\easyplussdk\bin;C:\Program Files (x86)\Skype\Phone\;.
Mar 26, 2016 6:09:56 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Mar 26, 2016 6:09:56 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Mar 26, 2016 6:09:56 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 1234 ms
Mar 26, 2016 6:09:56 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Mar 26, 2016 6:09:56 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.65
Mar 26, 2016 6:09:59 PM org.apache.catalina.startup.TldConfig execute
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Mar 26, 2016 6:09:59 PM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath
Mar 26, 2016 6:09:59 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.
Mar 26, 2016 6:09:59 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'appServlet'
Mar 26, 2016 6:10:00 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Mar 26, 2016 6:10:00 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Mar 26, 2016 6:10:00 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 4357 ms
Mar 26, 2016 6:10:50 PM org.apache.catalina.loader.WebappClassLoaderBase modified
SEVERE:     Resource '/WEB-INF/classes/com/theka/desi/Controllers/HomeController.class' is missing
Mar 26, 2016 6:10:50 PM org.apache.catalina.core.StandardContext reload
INFO: Reloading Context with name [/desi] has started
Mar 26, 2016 6:10:50 PM org.apache.catalina.core.ApplicationContext log
INFO: Destroying Spring FrameworkServlet 'appServlet'
Mar 26, 2016 6:10:50 PM org.apache.catalina.core.ApplicationContext log
INFO: Closing Spring root WebApplicationContext
Mar 26, 2016 6:10:52 PM org.apache.catalina.startup.TldConfig execute
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Mar 26, 2016 6:10:52 PM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath
Mar 26, 2016 6:10:52 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.
Mar 26, 2016 6:10:53 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'appServlet'
Mar 26, 2016 6:10:53 PM org.apache.catalina.core.StandardContext reload
INFO: Reloading Context with name [/desi] is completed

部署目录结构

我将项目运行为项目_>运行方式>在服务器上运行

【问题讨论】：

catalina.out 的任何日志
@andy 我已经添加了日志。没有日志相关的映射。
日志未显示应用已部署。
我同意@RomanC。您确定您的应用已配置为部署在 Tomcat 服务器中吗？
这些不是日志中的 desi，也许你需要尝试将你的项目发布到 tomcat

标签： java xml spring spring-mvc

【解决方案1】：

在你使用过的Spring配置文件中

<context:component-scan base-package="com.theka.desi.Controllers" />

是控制器所在的包名吗？如果不是，请更改为实际的包。

接下来，控制器类应该有@Controller注解，没有它Spring不能使用其他注解来映射请求的URLhttp://localhost:8080/desi/。

【讨论】：

包文件路径是正确的，并且在我的控制器类中也提到了@controller。我已经更新了有问题的类。请看一下并提出一些解决方案
什么是 Spring 版本？
4.0.3.RELEASE

【解决方案2】：

默认部署时，如果只有一个应用部署到tomcat，上下文根为'/'。除非你明确说是/desi，否则你应该使用http://localhost:8080/

【讨论】：

很抱歉应该说“由 eclipse 部署”而不是“在 tomcat 中部署”。如果将它添加到 Tomcat，那么除非 tomcat webapp 中的目录名为“ROOT”，否则它将使用应用程序文件夹的名称（因此，如果您使用 myapp，它将期望 localhost:8080\myapp