我从Spring Web开始（遵循Spring文档），我对初始化有一点问题
每次我有堆栈跟踪：＆＃34; java.lang.IllegalArgumentException：无法使用名称＆＃39;调度程序注册servlet＆＃39;。检查是否有另一个以相同名称注册的servlet。＆＃ 34;
以下是我的文件：
的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<!-- Configure ContextLoaderListener to use AnnotationConfigWebApplicationContext
instead of the default XmlWebApplicationContext -->
<context-param>
<param-name>contextClass</param-name>
<param-value>
org.springframework.web.context.support.AnnotationConfigWebApplicationContext
</param-value>
</context-param>
<!-- Configuration locations must consist of one or more comma- or space-delimited
fully-qualified @Configuration classes. Fully-qualified packages may also be
specified for component-scanning -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>com.lacunasaurus.configuration.SpringApplicationConfiguration</param-value>
</context-param>
<!-- Bootstrap the root application context as usual using ContextLoaderListener -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Declare a Spring MVC DispatcherServlet as usual -->
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- Configure DispatcherServlet to use AnnotationConfigWebApplicationContext
instead of the default XmlWebApplicationContext -->
<init-param>
<param-name>contextClass</param-name>
<param-value>
org.springframework.web.context.support.AnnotationConfigWebApplicationContext
</param-value>
</init-param>
<!-- Again, config locations must consist of one or more comma- or space-delimited
and fully-qualified @Configuration classes -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>com.lacunasaurus.configuration.SpringWebApplicationInitializer</param-value>
</init-param>
</servlet>
home.html的
<!DOCTYPE html>
<html>
<head>
<title>Start Page</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<h1>Hello World!</h1>
Greeting : ${greeting}
</body>
</html>
ControllerHome
package com.lacunasaurus.web.controllers;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
@RequestMapping("/")
public class ControllerHome {
@RequestMapping(method = RequestMethod.GET)
public String sayHello(ModelMap model) {
model.addAttribute("greeting", "Hello World from Spring 4 MVC");
return "welcome";
}
@RequestMapping(value = "/helloagain", method = RequestMethod.GET)
public String sayHelloAgain(ModelMap model) {
model.addAttribute("greeting", "Hello World Again, from Spring 4 MVC");
return "welcome";
}
}
Spring配置
package com.lacunasaurus.configuration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan(basePackages = {"com.lacunasaurus.service"})
public class SpringApplicationConfiguration {
}
Webinitializer
package com.lacunasaurus.configuration;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class SpringWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[]{SpringApplicationConfiguration.class};
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[]{WebConfig.class};
}
@Override
protected String[] getServletMappings() {
return new String[]{"/*"};
}
}
我的webconfig
package com.lacunasaurus.configuration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.lacunasaurus.web.controllers")
public class WebConfig {
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/WEB-INF/views/");
viewResolver.setSuffix(".html");
return viewResolver;
}
}
我使用maven和＆＃34; 4.3.4.RELEASE＆＃34;春季版
我的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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.lacunasaurus.vapologie</groupId>
<artifactId>test-web</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>Vapologie Webapp</name>
<properties>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.5.Final</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
</dependencies>
<build>
<finalName>test</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.0</version>
<configuration>
<showWarnings>true</showWarnings>
</configuration>
</plugin>
</plugins>
</build>
</project>
和完整的堆栈跟踪：
12-Dec-2016 23:16:35.543 SEVERE [localhost-startStop-1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/vapologie-web]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:586)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1780)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Failed to register servlet with name 'dispatcher'.Check if there is another servlet registered under the same name.
at org.springframework.util.Assert.notNull(Assert.java:115)
at org.springframework.web.servlet.support.AbstractDispatcherServletInitializer.registerDispatcherServlet(AbstractDispatcherServletInitializer.java:98)
at org.springframework.web.servlet.support.AbstractDispatcherServletInitializer.onStartup(AbstractDispatcherServletInitializer.java:71)
at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5170)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more
12-Dec-2016 23:16:35.544 SEVERE [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDescriptor Erreur lors du déploiement du descripteur de configuration C:\Users\Aurélien\AppData\Roaming\NetBeans\8.2\apache-tomcat-8.0.27.0_base\conf\Catalina\localhost\tes-web.xml
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/vapologie-web]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:729)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:586)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1780)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
感谢您的帮助：）
答案 0 :(得分：2)
我终于找到了一种通过java代码初始化的方法：）
在我的web.xml中：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>/</welcome-file>
</welcome-file-list>
</web-app>
我改变了我的WebConfig以扩展WebMvcConfigurerAdapter
public class VapologieWebConfig extends WebMvcConfigurerAdapter
但现在我有警告，因为春天不能将我重定向到我的观点:(
[2016-12-13 03:38:10,170] Artifact test-web:war exploded: Artifact is being deployed, please wait...
13-Dec-2016 15:38:12.283 INFOS [RMI TCP Connection(3)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
13-Dec-2016 15:38:12.523 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Root WebApplicationContext: initialization started
13-Dec-2016 15:38:12.672 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.support.AnnotationConfigWebApplicationContext.prepareRefresh Refreshing Root WebApplicationContext: startup date [Tue Dec 13 15:38:12 CET 2016]; root of context hierarchy
13-Dec-2016 15:38:12.782 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.support.AnnotationConfigWebApplicationContext.loadBeanDefinitions Registering annotated classes: [class com.lacunasaurus.test.configuration.SpringApplicationConfiguration]
13-Dec-2016 15:38:13.213 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.<init> JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
13-Dec-2016 15:38:13.350 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Root WebApplicationContext: initialization completed in 826 ms
13-Dec-2016 15:38:13.363 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.DispatcherServlet.initServletBean FrameworkServlet 'dispatcher': initialization started
13-Dec-2016 15:38:13.371 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.support.AnnotationConfigWebApplicationContext.prepareRefresh Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Tue Dec 13 15:38:13 CET 2016]; parent: Root WebApplicationContext
13-Dec-2016 15:38:13.373 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.support.AnnotationConfigWebApplicationContext.loadBeanDefinitions Registering annotated classes: [class com.lacunasaurus.test.configuration.testWebConfig]
13-Dec-2016 15:38:13.568 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.<init> JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
13-Dec-2016 15:38:14.108 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.register Mapped "{[/],methods=[GET]}" onto public java.lang.String com.lacunasaurus.test.web.controllers.ControllerHome.sayHello(org.springframework.ui.ModelMap)
13-Dec-2016 15:38:14.110 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.register Mapped "{[/helloagain],methods=[GET]}" onto public java.lang.String com.lacunasaurus.test.web.controllers.ControllerHome.sayHelloAgain(org.springframework.ui.ModelMap)
13-Dec-2016 15:38:14.167 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.initControllerAdviceCache Looking for @ControllerAdvice: WebApplicationContext for namespace 'dispatcher-servlet': startup date [Tue Dec 13 15:38:13 CET 2016]; parent: Root WebApplicationContext
13-Dec-2016 15:38:14.436 INFOS [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.DispatcherServlet.initServletBean FrameworkServlet 'dispatcher': initialization completed in 1072 ms
[2016-12-13 03:38:14,456] Artifact test-web:war exploded: Artifact is deployed successfully
[2016-12-13 03:38:14,456] Artifact test-web:war exploded: Deploy took 4 286 milliseconds
13-Dec-2016 15:38:14.865 AVERTISSEMENT [http-nio-8080-exec-1] org.springframework.web.servlet.PageNotFound.noHandlerFound No mapping found for HTTP request with URI [/test/WEB-INF/views/home.html] in DispatcherServlet with name 'dispatcher'
13-Dec-2016 15:38:15.785 AVERTISSEMENT [http-nio-8080-exec-3] org.springframework.web.servlet.PageNotFound.noHandlerFound No mapping found for HTTP request with URI [/test/WEB-INF/views/home.html] in DispatcherServlet with name 'dispatcher'
13-Dec-2016 15:38:19.982 INFOS [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Déploiement du répertoire D:\Serveurs\apache-tomcat-8.5.9\webapps\manager de l'application web
13-Dec-2016 15:38:20.086 INFOS [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory D:\Serveurs\apache-tomcat-8.5.9\webapps\manager has finished in 103 ms
-----------------编辑------------------------
我找到了解决方案！
在完整的java配置中，Web配置类需要实现servlet处理方法来激活configurer
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
现在我可以显示我的主页：）
感谢所有帮助我找到解决方案的人