菜鸟求助jsp问题

GuoChengRong 2011-03-17 09:37:25

本人用java写了个界面程序，代码如下

package com;

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 SurveyServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
request.setCharacterEncoding("utf-8");
out.println("姓名："+request.getParameter("name")+" ");
out.println("Email："+request.getParameter("email")+" ");
out.println("age："+request.getParameter("age")+" ");
out.println("编程时间："+request.getParameter("code")+" ");
out.println("操作系统：");
String os[]=request.getParameterValues("os");
out.println("<ul>");
for(int i=0;i<os.length;i++){
out.println("<li>"+os[i]+"<li>");
}
out.println("</ul> ");
out.println("编程语言：");
String language[]=request.getParameterValues("language");
out.println("<ul>");
for(int i=0;i<language.length;i++){
out.println("<li>"+language[i]+"<li>");}
out.println("</ul> ");
out.println("建议："+request.getParameter("comment")+" ");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}

}
在dos下可以已经通过编译，但是执行时出现如下错误D:\>java SurveyServlet
Exception in thread "main" java.lang.NoClassDefFoundError: SurveyServlet (wrong
name: com/SurveyServlet)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: SurveyServlet. Program will exit.

求高手解决，感激不尽

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扁鵲東南飛 2011-03-17

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D:\>java SurveyServlet
1、执行这句话的时候，注意当前类有没有一个 public static void main(String[] argo){} 方法；
2、你直接 java SurveyServlet 这样是不行的。因为这个是从jsp 页面跳转进来的。
用tomcat 或者其他的服务器，启动后，根据jsp页面的跳转，然后到这个类里面，执行。你什么都没有，然后直接执行java SurveyServlet 肯定是不行的。
建议你学学 jsp + Servelet
理解一下servlet的生命周期