Servlet[DispatcherServlet]的Servlet.init（）引发异常

在学习SpringMVC时经常会因为搭建环境而出错，找半天找不到问题，简直是脑溢血

在学习SpringMVC的请求参数-基本参数的时候出现异常

javax.servlet.ServletException: Servlet[DispatcherServlet]的Servlet.init（）引发异常org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:544)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:624)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1651)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:832)

之后进行了环境和配置的重新的搭建代码如下：

<?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:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"><!--Controller的组件扫描--><context:component-scan base-package="com.itheima"><context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/></context:component-scan><!--配置内部资源视图解析器--><bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!--  /jsp/success.jsp  --><property name="prefix" value="/jsp/"></property><property name="suffix" value=".jsp"></property></bean><!--配置处理器映射器--><!--<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"><property name="messageConverters"><list><bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/></list></property></bean>--><!--mvc的注解驱动--><mvc:annotation-driven conversion-service="conversionService"/><!--开放资源的访问--><!--<mvc:resources mapping="/js/**" location="/js/"/><mvc:resources mapping="/img/**" location="/img/"/>--><mvc:default-servlet-handler/><!--声明转换器--><bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"><property name="converters"><list><bean class="com.itheima.converter.DateConverter"></bean></list></property></bean><!--配置文件上传解析器--><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><property name="defaultEncoding" value="UYF-8"/><property name="maxUploadSize" value="500000"/></bean></beans>

还有就是pom文件下的依赖包不能少

 <dependencies><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.32</version></dependency><dependency><groupId>c3p0</groupId><artifactId>c3p0</artifactId><version>0.9.1.2</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.0.5.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.0.5.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>5.0.5.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.0.5.RELEASE</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.0.1</version><scope>provided</scope></dependency><dependency><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.2.1</version><scope>provided</scope></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.9.0</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-annotations</artifactId><version>2.9.0</version></dependency><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.1</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.3</version></dependency></dependencies>

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