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import java.io.*;
import java.text.*; //MessageFormat
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloServlet extends HttpServlet{
//ҳ�����
protected static final String strTitle = "Servlet����� - HelloServlet";
//ҳü
protected static final String strHeader =
"<html>"+
"<head>"+
"<meta http-equiv="Content-Type" content="text/html; charset=gb2312">"+
"<title>{0}</title>"+
"</head>"+
"<body>";
//ҳ��
protected static final String strFooter =
"</body>"+
"</html>";
//�?
protected static final String strForm =
"<form action="{0}" method="post">"+
"�����մ���<input type="text" name="name">"+
"<input type="submit" name="submit" value="�ύ">"+
"</form>";
protected static final String strHello =
"��ã�{0}����ӭ����Servlet/JSP���磡";
//������Ϣ
protected static final String strError =
"<h2><font color="#ff0000">{0}</font></h2>";
protected void doGet(HttpServletRequest req,HttpServletResponse resp) throws
 ServletException,IOException{
process(req,resp);
}
protected void doPost(HttpServletRequest req,HttpServletResponse resp) throw
s ServletException,IOException{
process(req,resp);
}
protected void process(HttpServletRequest req,HttpServletResponse resp) thro
ws ServletException,IOException{
try{
String submit = req.getParameter("submit");
if(submit==null)
printForm(req,resp);
else
printHello(req,resp);
}
catch(Exception e){
printError(e.toString(),req,resp);
}
}
protected void printForm(HttpServletRequest req,HttpServletResponse resp) th
rows ServletException,IOException{
//��ʹ��PrintWriterǰ��������Content Type
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
//���ҳü
out.print(MessageFormat.format(strHeader,new Object[]{strTitle+" - ����������
����"}));
//����?
out.print(MessageFormat.format(strForm,new Object[]{req.getContextPath()+req
getServletPath()}));
//���ҳ��
out.print(strFooter);
out.flush();
}
protected void printHello(HttpServletRequest req,HttpServletResponse resp) t
hrows ServletException,IOException{
//��ȡ�û���������
String name = req.getParameter("name");
if(name==null)
name = "������";
//��ʹ��PrintWriterǰ��������Content Type
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
//���ҳü
out.print(MessageFormat.format(strHeader,new Object[]{strTitle+" - ��ӭ��"})
);
//�����ӭ��Ϣ
out.print(MessageFormat.format(strHello,new Object[]{name}));
//���ҳ��
out.print(strFooter);
out.flush();
}
protected void printError(String error, HttpServletRequest req,HttpServletRe
sponse resp) throws ServletException,IOException{
//��ʹ��PrintWriterǰ��������Content Type
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
//���ҳü
out.print(MessageFormat.format(strHeader,new Object[]{strTitle+" - ������Ϣ"
}));
//���������Ϣ
out.print(MessageFormat.format(strError,new Object[]{error}));
//���ҳ��
out.print(strFooter);
out.flush();
}
}��
  

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