大家来找茬-SpringMVC中Tomcat正常启动，始终访问不了Controller,出404错

Posted 2020-07-02 挖坑大王

创建了一个空的SpringMVC项目，Tomcat可以正常启动，但是运行的时候，始终进不了Controller，并且报404错误。绝大多数是因为扫描包没配置好

eg:

web.xml如下：

<?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" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
version="3.0">
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/springmvc-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

springmvc-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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-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/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <!--默认注解映射的支持 -->
    <mvc:annotation-driven />

    <!--自动扫描目录下所有的类文件 -->
    <context:component-scan base-package="com.myspringmvc.controller.*" />

    <!--对模型视图名称的解析 -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

TestController.java

package com.myspringmvc.controller;

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

@Controller
public class TestController {
    
    @RequestMapping(value="/test",method={RequestMethod.GET,RequestMethod.POST})
    public String test() {
        return "test";
    }
}

访问页面:

解决方案如下：

<!--自动扫描目录下所有的类文件 -->
    <context:component-scan base-package="com.myspringmvc.controller.*" />

----改为---->>>>

    <!--自动扫描目录下所有的类文件 -->
    <context:component-scan base-package="com.myspringmvc.controller" />

内容来自：http://www.cnblogs.com/likun10579/p/5342562.html