📄 main.java
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package com.zhang.www;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Vector;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class Main extends HttpServlet {
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=GBK");
request.setCharacterEncoding("GBK");
PrintWriter out = response.getWriter();
String name = request.getParameter("text");
if (name == null || name.equals("")) {
out.println("<h1 style='color:red' align='center'>请返回，并输入呢称</h1>");
} else {
Vector vec = (Vector) getServletContext().getAttribute("userList");
if (vec == null)
vec = new Vector();
if (!vec.contains(name)) {
vec.add(name);
HttpSession ses = request.getSession();
ses.setAttribute("uname", name);
getServletContext().setAttribute("userList", vec);
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>聊天室</TITLE></HEAD>");
// out.println(" <BODY>");
out.println(" <frameset rows='80%,*'>");
out.println(" <frame src=top?name=" + name + ">");
out.println(" <frame src=message?name=" + name + ">");
out.println(" </frameset>");
out.println(" </BODY>");
out.println("</HTML>");
}
else
out.println("<h1 style='color:red' align='center'>用户名已存在，请重新输入</h1>");
}
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}
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