package mypack;加这个import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;public class firstservlet extends HttpServlet{
public void init(ServletConfig config)
throws ServletException {
super.init(config);
} public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException{
String user;
res.setContentType("text/html;charset=GB2312");
PrintWriter out=res.getWriter();
user=req.getParameter("input");
out.println("<html>");
out.println("<head><title>welcome</title></head>");
out.println("<body>");
out.println("you input is"+user);
out.println("</body>");
out.println("</html>");
}
public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException{
doGet(req,res);
}
}
import javax.servlet.http.*;
import java.io.*;public class firstservlet extends HttpServlet{
public void init(ServletConfig config)
throws ServletException {
super.init(config);
} public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException{
String user;
res.setContentType("text/html;charset=GB2312");
PrintWriter out=res.getWriter();
user=req.getParameter("input");
out.println("<html>");
out.println("<head><title>welcome</title></head>");
out.println("<body>");
out.println("you input is"+user);
out.println("</body>");
out.println("</html>");
}
public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException{
doGet(req,res);
}
}
<servlet-name>firstservlet</servlet-name>
<servlet-class>mypack.firstservlet</servlet-class>
</servlet>
在这里你的Class文件放到了mypack.firstservlet这个包里面了所以你的firstservlet.java文件因该加上一句package mypack;