菜鸟求助问题，急！！谢谢大牛们了~

form1.html代码：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>form1.html</title>
  </head>
  
  <body>
    <form action="/ServletForm/servlet/form1">
    First Name:
    <input type="text" name="firstName">
    <br>
    Last Name:
    <input type="text" name="lastName">
    <br>
    <input type="submit" value="Submit Form">
    </form>
  </body>
</html>
相关servlet代码：
import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class form1 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("  <HEAD><TITLE>form1</TITLE></HEAD>");
out.println("  <BODY>");
out.println("<p> firstName= " + request.getParameter("firstName") + "</p>");
out.println("<p> lastName= " + request.getParameter("lastName") + "</p>");
out.println("  </BODY>");
out.println("</HTML>");
out.close();
} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}}
我实现文本输入的信息通过按submit form通过servlet转跳到一个结果页面可是为什么老是报错
type Status reportmessage /ServletFrom/form1.htmldescription The requested resource (/ServletFrom/form1.html) is not available.我的web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <servlet>    <servlet-name>form1</servlet-name>
    <servlet-class>ServletForm.form1</servlet-class>
  </servlet>
 <servlet-mapping>
    <servlet-name>form1</servlet-name>
    <url-pattern>/servlet/form1</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>
是哪里出问题了呢？是书上例题为什么单独输入http://localhost:8080/Servlet_Exercise/form1.html和http://localhost:8080/Servlet_Exercise/servlet/form1都有反应的就是不能用书上的http://localhost:88080/ServletForm/form1.html访问呢，我的工程名石Servlet_Exercise.
求助于大牛们解惑~