jsp项目传到服务器后 servlet访问不到

Question

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我是把项目打包成war包上传的
提交表单到这个servlet，然后出现这个，求大神告知解决方法

Answer 1

补充一下

 <?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_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>port</display-name>
  <servlet>
    <servlet-name>UploadServlet</servlet-name>
    <servlet-class>Servlet.UploadServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>UploadServlet</servlet-name>
    <url-pattern>/upload</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>UpdateServlet</servlet-name>
    <servlet-class>Servlet.UpdateServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>UpdateServlet</servlet-name>
    <url-pattern>/update</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>re_UploadServlet</servlet-name>
    <servlet-class>Servlet.re_UploadServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>re_UploadServlet</servlet-name>
    <url-pattern>/re_upload</url-pattern>
  </servlet-mapping>

   <servlet>
    <servlet-name>re_UpdateServlet</servlet-name>
    <servlet-class>Servlet.re_UpdateServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>re_UpdateServlet</servlet-name>
    <url-pattern>/re_update</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>Servlet.LoginServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/login</url-pattern>
  </servlet-mapping>
  <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>
</web-app>

这是我的web.xml配置，本地上访问servlet都没问题，可是上传到服务器上就访问不到，出现404