package group2.shenyang;
import java.io.*;
import java.net.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
/*****************************************************************************
Name: Update.java
Input:
3 parameters from POP.java by using Cookies
user: username
pass: password
host: hostname
1 parameter from POP.java by querystring
msg: total # of msgs that the user has
Functionality:
- Fetches cookies & the msg parameter
- Logs into the POP server
- Decide which emails to delete and delete them
- Logs out from the server
Output:
A HTML page stating how many emails were deleted and how many were left on
the server.
Error Checks:
Same as POP.java
****************************************************************************/
public class Update extends HttpServlet{
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
res.setContentType("text/html");
ServletOutputStream out=res.getOutputStream();
try{
// Determine fields + get Cookies
int msg=Integer.parseInt(req.getParameter("msg"));
Cookie[] cookie=new Cookie[3];
String[] name=new String[3];
String user="blah", pass="blah", host="blah";
cookie=req.getCookies();
for(int j=0; j<=2; j++){
name[j]=cookie[j].getName();
if (name[j].equals("hostname")){
host=cookie[j].getValue();
}
else if (name[j].equals("password")){
pass=cookie[j].getValue();
}
else if (name[j].equals("username")){
user=cookie[j].getValue();
}
}
// Create socket and log in
Socket sock=new Socket(host, 110);
PrintStream in_sock=new PrintStream(sock.getOutputStream());
DataInputStream out_sock=new DataInputStream(sock.getInputStream());
String pop_res;
pop_res=out_sock.readLine();
if (! pop_res.startsWith("+OK")){
throw new ServletException("POP3 Server Not Ready");
}
in_sock.println("USER "+user);
pop_res=out_sock.readLine();
if (! pop_res.startsWith("+OK")){
throw new ServletException("Incorrect Username");
}
in_sock.println("PASS "+pass);
pop_res=out_sock.readLine();
if (! pop_res.startsWith("+OK")){
throw new ServletException("Incorrect Password");
}
// Figure out which emails to delete
int numDel=0, i;
String del;
for(i=1; i<=msg; i++){
del=req.getParameter("del"+i);
if (del != null && del.equals("on")){
in_sock.println("DELE "+i);
pop_res=out_sock.readLine();
if (! pop_res.startsWith("+OK")){
throw new ServletException("POP3 Server Error: msg "+i+"cannot be deleted");
}
numDel++;
}
}
in_sock.println("QUIT");
// Output HTML page
out.println(""+numDel+" Messages Deleted");
out.println(""+numDel+" Messages Deleted
");
int mailLeft=msg-numDel;
out.println("You have "+mailLeft+" mail(s) left on server");
}
catch (ServletException e){
out.println(""+e+"");
out.println(""+e+"");
}
catch (UnknownHostException e){
out.println("Unknown Host");
out.println(""+e+"
");
out.println("The hostname you supplied is unknown, try again!");
out.println("");
}
catch (IOException e){
out.println("IOException");
out.println(""+e+"
");
out.println("");
}
}
}