带有嵌入式Tomcat的Spring WebMVC在jsp上提供404

分类：编程问答

如何解决带有嵌入式Tomcat的Spring WebMVC在jsp上提供404

我正在尝试在嵌入式Tomcat上运行的Spring WebMVC Webapp中处理JSP，但是我的所有请求都返回404：

TRACE 2020-08-23T14:45:50.566 [http-nio-8080-exec-1] o.s.web.servlet.DispatcherServlet(LogFormatUtils.java:88) GET "/",parameters={},headers={masked} in DispatcherServlet 'dispatcherServlet'
TRACE 2020-08-23T14:45:50.568 [http-nio-8080-exec-1] o.s.b.f.s.DefaultListableBeanFactory(AbstractBeanFactory.java:258) Returning cached instance of singleton bean 'websiteController'
TRACE 2020-08-23T14:45:50.569 [http-nio-8080-exec-1] o.s.w.s.m.m.a.RequestMappingHandlerMapping(AbstractHandlerMapping.java:411) Mapped to com.test.web.WebsiteController#homepage()
TRACE 2020-08-23T14:45:50.574 [http-nio-8080-exec-1] o.s.w.s.m.m.a.ServletInvocableHandlerMethod(InvocableHandlerMethod.java:136) Arguments: []
TRACE 2020-08-23T14:45:50.577 [http-nio-8080-exec-1] com.test.view.SimpleViewResolver(SimpleViewResolver.java:38) No resource found for viewName=index
TRACE 2020-08-23T14:45:50.579 [http-nio-8080-exec-1] o.s.b.f.s.DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory.java:1839) Invoking afterPropertiesSet() on bean with name 'index'
TRACE 2020-08-23T14:45:50.579 [http-nio-8080-exec-1] o.s.web.servlet.DispatcherServlet(DispatcherServlet.java:1367) Rendering view [org.springframework.web.servlet.view.JstlView: name 'index'; URL [/templates/jsp/index.jsp]] 
DEBUG 2020-08-23T14:45:52.089 [http-nio-8080-exec-1] o.s.web.servlet.view.JstlView(AbstractView.java:309) View name 'index',model {}
DEBUG 2020-08-23T14:45:52.092 [http-nio-8080-exec-1] o.s.web.servlet.view.JstlView(InternalResourceView.java:169) Forwarding to [/templates/jsp/index.jsp]
23-Aug-2020 15:25:31.487 FINE [http-nio-8080-exec-1] org.apache.jasper.servlet.JspServlet.service JspEngine --> /templates/jsp/index.jsp
23-Aug-2020 15:25:31.487 FINE [http-nio-8080-exec-1] org.apache.jasper.servlet.JspServlet.service        ServletPath: /templates/jsp/index.jsp
23-Aug-2020 15:25:31.487 FINE [http-nio-8080-exec-1] org.apache.jasper.servlet.JspServlet.service           PathInfo: null
23-Aug-2020 15:25:31.488 FINE [http-nio-8080-exec-1] org.apache.jasper.servlet.JspServlet.service           RealPath: null
23-Aug-2020 15:25:31.488 FINE [http-nio-8080-exec-1] org.apache.jasper.servlet.JspServlet.service         RequestURI: /templates/jsp/index.jsp
23-Aug-2020 15:25:31.488 FINE [http-nio-8080-exec-1] org.apache.jasper.servlet.JspServlet.service        QueryString: null
DEBUG 2020-08-23T14:45:52.097 [http-nio-8080-exec-1] o.s.web.servlet.DispatcherServlet(FrameworkServlet.java:1131) Completed 404 NOT_FOUND,headers={}

这是我配置应用程序的方式：

package com.test.context;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

@Configuration
@ComponentScan("com.test")
@EnableWebMvc()
public class ApplicationConfiguration
{
    @Bean
    public InternalResourceViewResolver internalResourceViewResolver()
    {
        InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();
        internalResourceViewResolver.setPrefix("/templates/jsp/");
        internalResourceViewResolver.setSuffix(".jsp");
        return internalResourceViewResolver;
    }
}

我的控制器：

package com.test.web;

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

@Controller
public class WebsiteController
{
    @GetMapping("/")
    public String homepage()
    {
        return "index";
    }
}

我正在主类中手动配置Tomcat：

package com.test;

import com.test.context.ApplicationConfiguration;
import org.apache.catalina.Context;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.Wrapper;
import org.apache.catalina.startup.Tomcat;
import org.apache.jasper.servlet.JspServlet;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class ApplicationLauncher
{
    public static void main(String[] args) throws LifecycleException
    {
        Tomcat tomcat = new Tomcat();
        tomcat.setPort(8080);
        tomcat.getConnector();

        Context ctx = tomcat.addContext("",null);

        // Tomcat JSP Servlet

        Wrapper jspServlet = Tomcat.addServlet(ctx,"jsp",new JspServlet());
        jspServlet.setLoadOnStartup(1);
        jspServlet.addMapping("*.jsp");

        // Spring DispatcherServlet

        AnnotationConfigWebApplicationContext appCtx = new AnnotationConfigWebApplicationContext();
        appCtx.register(ApplicationConfiguration.class);
        appCtx.setServletContext(ctx.getServletContext());
        appCtx.registerShutdownHook();
        appCtx.refresh();
        DispatcherServlet dispatcherServlet = new DispatcherServlet(appCtx);

        Wrapper servletWrapper = Tomcat.addServlet(ctx,"dispatcherServlet",dispatcherServlet);
        servletWrapper.setLoadOnStartup(2);
        servletWrapper.addMapping("/");


        tomcat.start();
    }

这是我的pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<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>com.test</groupId>
    <artifactId>springjsp</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>jar</packaging>

    <properties>
        <maven.compiler.source>14</maven.compiler.source>
        <maven.compiler.target>14</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <version>9.0.37</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
            </plugin>
        </plugins>
    </build>
</project>

似乎我的请求符合JspServlet的要求（如上面的日志输出所证明的那样，并且符合JspServlet.service()中的断点），但是我不知道如何配置它才能真正起作用。

jsp位于{project dir}/src/main/resources/templates/jsp/中。我尝试提供到internalResourceViewResolver.setPrefix()的绝对路径，但是结果是相同的。

解决方法

尝试降低依赖性

       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

代替

    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
        <version>9.0.37</version>
    </dependency>

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