java - 基本 Spring MVC。 HTTP 404 错误。尝试了所有可能的解决方案

Question

我在执行基本的 spring mvc 应用程序时遇到问题。我尝试了所有可能的解决方案，最后想解决这个问题。我不想创建一个新的工作区并再次执行此操作。我想让这个工作。这是我的GitHub url对于该项目。我登陆到正确的页面(index.jsp)。

我尝试了所有这些

1. <mvc:annotation-driven/>
2. <mvc:default-servlet-handler/>
3. 调整@RequestMapping从方法到类并通过将其更改为 (/welcome)至(value = "/welcome", method = {RequestMethod.GET,RequestMethod.POST})

有时我会看到no-mapping-found-for-http-request-with-uri-in-dispatcherservlet-with-name控制台中出现错误，有时什么也没有。

我知道那里有很多类似的问题，我已经解决了很多问题并开始了这个新线程。我的问题是

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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>BasicSpringMVC1</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

    <servlet>
        <servlet-name>basicspringmvc</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>basicspringmvc</servlet-name>
        <url-pattern>/welcome.jsp</url-pattern>
        <url-pattern>/welcome.html</url-pattern>
        <url-pattern>/test.jsp</url-pattern>
        <url-pattern>/test.html</url-pattern>
        <url-pattern>*.html</url-pattern>
    </servlet-mapping>

</web-app>

basicspringmvc-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
    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-4.3.xsd
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-4.3.xsd">
    <context:component-scan base-package="com.basicSpringMvc1.controller" />
 <mvc:annotation-driven/>
   <mvc:default-servlet-handler/>

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

</beans>

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
  <groupId>BasicSpringMVC1</groupId>
  <artifactId>BasicSpringMVC1</artifactId>
  <version>0.0.1-SNAPSHOT</version>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>

        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.3.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.3.1.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
    </dependencies>
</project>

SpringHelloWorld.java

package com.basicSpringMvc1.controller;

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

@Controller
public class SpringHelloWorld {

    @RequestMapping("/welcome")
    public ModelAndView helloWorld() {

        String message = "<br><div style='text-align:center;'>"
                + "<h3>********** Hello World, Spring MVC Tutorial</h3>This message is coming from SpringHelloWorld.java **********</div><br><br>";
        return new ModelAndView("welcome", "message", message);
    }
}

项目结构

Answer 1

请注意，在您的 servlet 映射中:

 <servlet-mapping>
    <url-pattern>/welcome.html</url-pattern>
 </servlet-mapping>

您已添加 welcome.html 的 url-pattern 。 但是您的 Controller 的请求映射设置为 @RequestMapping("/welcome") 。

添加 /welcome 的 url 映射:
<servlet-mapping> <url-pattern>/welcome</url-pattern> </servlet-mapping>
这样就可以映射到您的 Controller 。

或者将 Controller 的请求映射更改为 @RequestMapping("/welcome.html")以便 Controller 映射到 welcome.html .