import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class Sqrt extends HttpServlet{ public void init(ServletConfig config) throws ServletException { super.init(config); } public void sercive(HttpServletRequest request, HttpServletResponse response) throws IOException { PrintWriter out = response.getWriter(); response.setContentType("text/html;charset=GB2312"); out.print("<html><body>"); String number = request.getParameter("number"); double n = 0; try { n = Double.parseDouble(number); out.print("<BR>+Math.sqrt(n)"); } catch (NumberFormatException e) { out.print("<H1>请输入正整数</H1>"); } }}这段程序的字节码文件放那 TOMCAT1。5才能被下面的 JSP调用 需要什么样的配置 环境变量== <%@ page contentType="text/html;charset=GB2312"%><HTML><BODY bgcolor=Liver><FONT size=3><P>输入一个数。求这个数的平方根：<FORM method=get action="servlet/Sqrt"> <Input type="text" name="number"> <Input type="submit" name="submit" value="提交"></FORM></FONT></BODY></HTML>