servlet解析报错 排除路径错误

先贴上jsp代码

<form action="<%=basePath %>/FoodAddServlet" method="post" enctype="multipart/form-data">

再贴上servlet java的代码

public class FoodAddServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	    try {
	    	   // 用于完成数据的接受,使用map数据结构来保存key-value
		    HashMap<String, String> map= new HashMap<>();
		    //文件上传的基本操作 1.需要创作磁盘文件项工厂对象
	        DiskFileItemFactory diskfileitemfactory= new  DiskFileItemFactory();
	        //2.创建一个核心解析类
	        ServletFileUpload servletfileupload = new ServletFileUpload (diskfileitemfactory);
	        //3解析request请求，返回值是list集合，存放file item， 代表页面中的每一个解析项	
			List<FileItem> list=servletfileupload.parseRequest(request);
			//4. 遍历集合 获得file item， 判断其为表单项还是文件上传项
			for (FileItem fileitem:list) {
				if(fileitem.isFormField()) {
					//普通表单项，文本框，接受表单参数
					String Name=fileitem.getFieldName();//获得表单项的name属性
					String Value=fileitem.getString("UTF-8");//获得表单项的值
					System.out.println(Name+"   "+Value);
				}else {
					
				}
			}		
		} catch (FileUploadException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	   
		
	}

我觉得路径应该没有问题，但是测试print一直没有输出

再贴上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_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>reg_login1</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <description></description>
    <display-name>InitServlet</display-name>
    <servlet-name>InitServlet</servlet-name>
    <servlet-class>com.imooc.servlet.InitServlet</servlet-class>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>InitServlet</servlet-name>
    <url-pattern>/InitServlet</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>FoodAddServlet</display-name>
    <servlet-name>FoodAddServlet</servlet-name>
    <servlet-class>com.imooc.servlet.FoodAddServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>FoodAddServlet</servlet-name>
    <url-pattern>/FoodAddServlet</url-pattern>
  </servlet-mapping>
</web-app>

现在贴上错误信息

HTTP Status 500 – Internal Server Error

Type Exception Report

Message Error instantiating servlet class [com.imooc.servlet.FoodAddServlet]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

javax.servlet.ServletException: Error instantiating servlet class [com.imooc.servlet.FoodAddServlet]
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:412)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1385)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:844)

Root Cause

java.lang.ClassNotFoundException: com.imooc.servlet.FoodAddServlet
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1292)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1121)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:412)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1385)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:844)

Note The full stack trace of the root cause is available in the server logs.

Apache Tomcat/9.0.8