java - 未在请求的 DispatcherServlet 中找到任何 WebApplicationContext，并且未注册 ContextLoaderListener

Question

除了我使用的是嵌入式 tomcat 之外，我发现了几个具有相同问题的问题。

我尝试了我找到的所有答案，其中大部分与 ContextLoaderListener 和依赖项相关。

我注意到，当我在“mvn clean package”之后构建应用程序时，有几个关于重复的警告，但老实说，我认为这不是问题所在。我相信嵌入式 Tomcat 配置和上下文之间存在一些问题。

构建期间的日志

C:\STS\wsRestTemplate\TestDeployment>mvn clean package
...
[INFO] --- maven-jar-plugin:2.6:jar (default-jar) @ TestDeployment ---
[INFO] Building jar: C:\STS\wsRestTemplate\TestDeployment\target\embeddedApp.jar

[INFO]
[INFO] --- appassembler-maven-plugin:1.10:assemble (default) @ TestDeployment --
-
[WARNING] The usage of program name (App) is deprecated. Please use program.id i
nstead.
[INFO] Installing artifact C:\Users\e049447\.m2\repository\org\springframework\s
pring-web\4.2.5.RELEASE\spring-web-4.2.5.RELEASE.jar to C:\STS\wsRestTemplate\Te
stDeployment\target\repo\org\springframework\spring-web\4.2.5.RELEASE\spring-web
-4.2.5.RELEASE.jar
[INFO] Installing artifact C:\Users\e049447\.m2\repository\org\springframework\s
pring-aop\4.2.5.RELEASE\spring-aop-4.2.5.RELEASE.jar to C:\STS\wsRestTemplate\Te
stDeployment\target\repo\org\springframework\spring-aop\4.2.5.RELEASE\spring-aop
-4.2.5.RELEASE.jar
...
[INFO] Installing artifact C:\STS\wsRestTemplate\TestDeployment\target\embeddedA
pp.jar to C:\STS\wsRestTemplate\TestDeployment\target\repo\com\mastercard\ictt\b
atchs\TestDeployment\0.0.1-SNAPSHOT\TestDeployment-0.0.1-SNAPSHOT.jar
[INFO]
[INFO] --- maven-shade-plugin:1.3.3:shade (default) @ TestDeployment ---
[INFO] Including org.springframework:spring-web:jar:4.2.5.RELEASE in the shaded
jar.
[INFO] Including org.springframework:spring-aop:jar:4.2.5.RELEASE in the shaded
...[INFO] Including commons-io:commons-io:jar:2.2 in the shaded jar.
[INFO] Including javax.servlet:javax.servlet-api:jar:3.0.1 in the shaded jar.
[WARNING] We have a duplicate org/apache/jasper/Constants.class in C:\Users\e049
447\.m2\repository\org\apache\tomcat\tomcat-jasper\8.0.32\tomcat-jasper-8.0.32.j
ar
[WARNING] We have a duplicate org/apache/jasper/EmbeddedServletOptions.class in
C:\Users\e049447\.m2\repository\org\apache\tomcat\tomcat-jasper\8.0.32\tomcat-ja
sper-8.0.32.jar
[WARNING] We have a duplicate org/apache/jasper/JasperException.class in C:\User
s\e049447\.m2\repository\org\apache\tomcat\tomcat-jasper\8.0.32\tomcat-jasper-8.
0.32.jar
[WARNING] We have a duplicate org/apache/jasper/JspC.class in C:\Users\e049447\.
m2\repository\org\apache\tomcat\tomcat-jasper\8.0.32\tomcat-jasper-8.0.32.jar
[WARNING] We have a duplicate org/apache/jasper/JspCompilationContext.class in C
:\Users\e049447\.m2\repository\org\apache\tomcat\tomcat-jasper\8.0.32\tomcat-jas
per-8.0.32.jar

App-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   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-4.2.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-4.2.xsd">

   <context:component-scan base-package="com.mycomp.myapp.batchs.AuthFileUpload" />

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

   <bean id="multipartResolver"
              class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />
</beans>

网络.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 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_3_0.xsd">

       <display-name>Spring MVC Application</display-name>

       <!-- I tried add COntextLoader Listener and explicitly point to App-servlet.xml but I don~t think it is necessary
       By the way, same error with it or without -->
       <!-- listener>
              <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
       </listener>

       <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/App-servlet.xml</param-value>
              </context-param -->

       <servlet>
              <servlet-name>App</servlet-name>
                           <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

              <load-on-startup>1</load-on-startup>
       </servlet>

       <servlet-mapping>
              <servlet-name>App</servlet-name>
              <url-pattern>/</url-pattern>
       </servlet-mapping>
       <welcome-file-list>
              <welcome-file>index.jsp</welcome-file>
       </welcome-file-list>

</web-app>

静态主体

import org.apache.catalina.LifecycleException;
import org.apache.catalina.startup.Tomcat;


public class App
{
    public static void main( String[] args ) throws LifecycleException
    {
              Tomcat tomcat = new Tomcat();

              tomcat.setPort(8080);
              tomcat.setBaseDir("C\\temp");
              tomcat.addWebapp(tomcat.getHost(), "/", "C:\\temp\\");//
              tomcat.start();
              tomcat.getServer().await();
    }
}

Index.jsp(如果我注释下面的所有行并添加一个简单的 Hello Word 字符串，它将作为欢迎页面使用)

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<html>
<body>

<h2>Uploading a file.. </h2>
      <form:form method="POST" action="uploadFile" enctype="multipart/form-data">
              Upload your file please:
              <input type="file" name="file" />
              <input type="text" name="name">
              <input type="submit" value="Upload" />
              <form:errors path="file" cssStyle="color: #ff0000;" />
       </form:form>

</body>
</html>

Controller

@Controller
public class FileUploadController {


       @RequestMapping(value="/upload",method = RequestMethod.GET)
       public String printHello(ModelMap model) {
             return "index";
          }

Answer 1

问题出在 web.xml 中的 servlet 映射。根据 servlet 规范，映射/覆盖了容器的默认 servlet。这意味着您的 DispatcherServlet 映射到所有没有显式映射的请求。但是，.jsp 扩展名映射到容器的 jsp servlet。因此 index.jsp 不会通过 DispatcherServlet，因此您不能在那里使用 spring form taglib。

改为为您的 index.jsp 实现一个 Controller ，以便它通过调度程序 servlet

@Controller
public class WelcomeController{

  @RequestMapping(value = "/")
  public String welcome(){
     return "index";
  }
}

然后将您的 index.jsp 移动到 WEB-INF 文件夹以匹配您的 ViewResolver 设置。然后删除

<welcome-file-list>
              <welcome-file>index.jsp</welcome-file>
       </welcome-file-list>

在 web.xml 中