📄 loginbyservlet.java
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import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class LoginByServlet extends HttpServlet
{
Hashtable hashtable=new Hashtable();
public void init(ServletConfig config) throws ServletException
{
super.init(config);
}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException
{
PrintWriter out=response.getWriter();
response.setContentType("text/html;charset=GB2312");
//OutputStream();
response.setContentType("text/html");
out.println("<HTML><BODY>");
String person_name=request.getParameter("name"),name_found=null;
if(person_name==null)person_name="";
name_found=(String)hashtable.get(person_name);
if(name_found==null)
{
String person_email=request.getParameter("address");
if(person_email==null)person_email="";
StringTokenizer fenxi=new StringTokenizer(person_email," @");
int n=fenxi.countTokens();
if(n>=3) out.print("<BR>"+"there are exists illegal letters in your email");
else
{
hashtable.put(person_name,person_name);
out.print("<BR>"+"login success!");
out.print("<BR>"+"your name is "+person_name);
}
}
else
out.print("<BR>"+"This name has exist ");
out.println("</BODY></HTML>");
}
public synchronized void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException
{
doPost(request,response);
}
}
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