为什么图片无法加载？

<?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>yanzhengma1kaptcha</display-name>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
   <servlet-name>kaptcha</servlet-name>
   <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
  </servlet>
  <servlet-mapping>
   <servlet-name>kaptcha</servlet-name>
   <url-pattern>/randomcode.jpg</url-pattern>
  </servlet-mapping>
</web-app>

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Insert title here</title>
</head>
<body>
<img alt="验证码" src="/randomcode.jpg">
</body>
</html>

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