tomcat 错误 404 - 源服务器没有找到目标资源的当前表示或不愿意透露存在的表示答案

【问题标题】：tomcat error 404 - The origin server did not find a current representation for the target resource or is not willing to disclose that one existstomcat 错误 404 - 源服务器没有找到目标资源的当前表示或不愿意透露存在的表示
【发布时间】：2023-03-26 03:22:02
【问题描述】：

我正在尝试在 intellij 上使用 spring 配置项目，但仍然显示错误 404。配置文件来自 udemy 课程任何建议都会有所帮助。

Tomcat 版本：9.0.7

项目结构： Project structure ：

控制器类：

package com.Controllers;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloController {

    @RequestMapping("/")
public String showPage(){
    return "main";
}
}

main.jsp：

<!DOCTYPE html>
<html>
<body>
<h2>Works</h2>
</body>
</html>

web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>test2</display-name>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <!--suppress XmlPathReference -->
        <param-value>\WEB-INF\spring-mvc-demo-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

spring-mvc-demo-servlet.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" 
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
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
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc.xsd
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!-- Add support for component scanning -->
<context:component-scan base-package="com.Controllers" />
<context:component-scan base-package="com" />
<!-- Add support for conversion, formatting and validation support -->
<mvc:annotation-driven/>

<!-- Define Spring MVC view resolver -->
<bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/view/" />
    <property name="suffix" value=".jsp" />
</bean>

<!-- Step 1: Define Database DataSource / connection pool -->
<bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
    <property name="driverClass" value="com.mysql.cj.jdbc.Driver" />
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/webservice?useSSL=false" />
    <property name="user" value="root" />
    <property name="password" value="root" />

    <!-- these are connection pool properties for C3P0 -->
    <property name="minPoolSize" value="5" />
    <property name="maxPoolSize" value="20" />
    <property name="maxIdleTime" value="30000" />
</bean>


    <!-- Step 2: Setup Hibernate session factory -->
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
    <property name="dataSource" ref="myDataSource" />
    <property name="packagesToScan" value="com.Entity" />
    <property name="hibernateProperties">
       <props>
          <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
          <prop key="hibernate.show_sql">true</prop>
       </props>
    </property>

spring-mvc-demo-servlet.xml： 续

<!-- Step 3: Setup Hibernate transaction manager -->
<bean id="myTransactionManager"          class="org.springframework.orm.hibernate5.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- Step 4: Enable configuration of transactional behavior based on annotations -->
<tx:annotation-driven transaction-manager="myTransactionManager" />

<!-- Add support for reading web resources: css, images, js, etc ... -->
<mvc:resources location="/web/resources/" mapping="/resources/**"></mvc:resources>

【问题讨论】：

您可以发布您遇到的错误的屏幕截图吗？另外，如果您可以共享日志，那就太好了。
肯定有截图：screen
catalina 日志：pastebin.com/YcxriXn3
tomcat9-stderr 日志：pastebin.com/8k1dMdaH
你正在调用 /test2，而在你的控制器中你正在监听 "/"，尝试添加 "/test2 并检查它。@RequestMapping("/test2")

标签： java spring tomcat

【解决方案1】：

尝试像这样在@Controller 下添加@RequestMapping("/")：

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

 @RequestMapping(value = "/", method = RequestMethod.GET)
 public String showPage(){
 return "main";
 }
}

【讨论】：

【解决方案2】：

我遇到了和你类似的问题。这是因为项目结构。

请检查您的main.jsp 层次结构。

必须在下面

../WEB-INF/view/main.jsp

你必须像这样称呼它

http://localhost:portNumber/yourProjectName/

（例如：http://localhost:8080/1-SpringMVC-Demo/）

【讨论】：