chat room

最新推荐文章于 2024-04-21 10:05:47 发布

blackboy_my

最新推荐文章于 2024-04-21 10:05:47 发布

阅读量674

点赞数

文章标签： string import servlet action class input

本文链接：https://blog.youkuaiyun.com/blackboy_my/article/details/2489026

版权

08月31日(星期五)

主要用到技术servlet

＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝

control servlet

===============================

package chatroom;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class ControlServlet extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GBK";

//Initialize global variables
public void init() throws ServletException {
}

//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
response.setContentType(CONTENT_TYPE);
request.setCharacterEncoding("GBK");
PrintWriter out = response.getWriter();
String actiontype = request.getParameter("action");
if (actiontype != null &&actiontype.equals("login")) {
String name = request.getParameter("txtName");
if (name == null || name.equals("")) {
name = "游客" + Math.random() % 100;
}
HttpSession session = request.getSession(true);
session.setAttribute("loginName", name);
ArrayList namelist = null;
Object obj = this.getServletContext().getAttribute("namelist");
if (obj == null) {
namelist = new ArrayList();
} else {
namelist = (ArrayList) obj;
}
namelist.add(name);
this.getServletContext().setAttribute("nameList", namelist);
response.sendRedirect("mainservlet");

}

out.close();
}

//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request, response);
}

//Clean up resources
public void destroy() {
}
}
============================

main serlvet

===========================

package chatroom;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class MainServlet extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GBK";

//Initialize global variables
public void init() throws ServletException {
}

//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
response.setContentType(CONTENT_TYPE);
request.setCharacterEncoding("GBK");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>MainServlet</title></head>");
out.println("<body bgcolor="#ffffff">");
//显示当前用户
ArrayList namelist = (ArrayList)this.getServletContext().getAttribute(
"nameList");
Iterator iter = namelist.iterator();
while (iter.hasNext()) {
Object item = (Object) iter.next();
out.println(item + "    ");
}
out.println("<hr color='green'>");
//显示聊天室打出的话
ArrayList MsgList = null;
Object obj = this.getServletContext().getAttribute("MessageList");
if (obj != null) {
MsgList = (ArrayList) obj;
Iterator iters = MsgList.iterator();
while (iters.hasNext()) {
Message item = (Message) iters.next();
out.println(item.getUserName() + "说: " + item.getMsg()+"<br>" +
"<hr color='red'>");

}

}
out.println("<form action='messageservlet' method ='POST'>");
out.println("<input type='text' name='txtMsg' />");
out.println("<input type='submit' value='说'/>");

out.println("</body>");
out.println("</html>");
out.close();
}

//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request, response);
}

//Clean up resources
public void destroy() {
}
}
=================================

Message servlet

================================

package chatroom;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class MessageServlet extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GBK";

//Initialize global variables
public void init() throws ServletException {
}

ArrayList MsgList = null;
Object obj = this.getServletContext().getAttribute("MessageList");
if (obj == null) {
MsgList = new ArrayList();

} else {
MsgList = (ArrayList) obj;

}
MsgList.add(Msgobj);
this.getServletContext().setAttribute("MessageList", MsgList);
response.sendRedirect("mainservlet");
out.close();
}

//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request, response);
}

//Clean up resources
public void destroy() {
}
}
===================================

message bean entity class

===================================

package chatroom;

public class Message {
private String userName;
private String msg;
public Message() {
}

public void setUserName(String userName) {
this.userName = userName;
}

public void setMsg(String msg) {
this.msg = msg;
}

public String getUserName() {
return userName;
}

public String getMsg() {
return msg;
}
}
===========================

index.html

==========================

<html>
<head ><title>login</title>
</head>
<body>
<form action="controlservlet" method="POST" >
<input type="hidden" name="action" value="login"/>
<table border ="1">
<tr><td>姓名</td>
<td><input type="text" name="txtName"/></td></tr>
<tr><td>密码</td><td><input type="password"name="txtpwd"/></td>
</tr>
<tr><td colspan="1"><input type="submit" value="提交" />   
<input type="reset" value="重置" /></td>
</tr>

</table></form>
</body>
</html>