怎么用javaweb实现在线聊天工具

本篇内容主要讲解“怎么用javaweb实现在线聊天工具”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么用javaweb实现在线聊天工具”吧!

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写这个玩意儿就是想练练手，用户需要登陆才能在线聊天，不要依赖数据库，不需要数据库的操作，所有的数据都是保存在内存中，如果服务器一旦重启，数据就没有了；

登录界面：

怎么用javaweb实现在线聊天工具

聊天界面：

怎么用javaweb实现在线聊天工具

左侧是在线的用户列表，右侧是聊天的内容，内容的格式为 “作者：内容”；

点击button可以发布聊天信息；

使用的是spring搭建的框架，基于tomcat的服务器；

web.xml的配置如下：

                index.htm              test     org.springframework.web.servlet.DispatcherServlet     1                test     *.htm                    org.springframework.web.context.ContextLoaderListener                        CharacterEncodingFilter         com.nono.Filter.CharacterEncodingFilter                      encoding             UTF-8                                   SecurityServlet           com.nono.SecurityServlet                         SecurityServlet           *.htm                                             contextConfigLocation                           /WEB-INF/test-servlet.xml

conteConfigLocation的配置为：

                                                   .jsp

整个项目的结构为一个主路由，四个po层, 两个过滤器：

怎么用javaweb实现在线聊天工具

界面的用户列表和用户内容列表用了ajax刷新，感觉不错的说：

 <%@ page language="java" import="java.util.*"  pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>           ">          login                                                                                                                                          list                         
                                                      name—
                             name—
                             name—
                             name—

content

haha: say someting

package com.nono; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.nono.po.User; public class SecurityServlet extends HttpServlet implements Filter { private static final long serialVersionUID = 1L; public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { HttpServletRequest request=(HttpServletRequest)arg0; HttpServletResponse response =(HttpServletResponse) arg1; HttpSession session = request.getSession(); User user = (User) session.getAttribute("user"); String url=request.getRequestURI(); //如果用户信息不是空的，或者要访问的是登陆的界面(get,post的方式包含了login字符串); if( user!=null || url.indexOf("login")>-1 ) { arg2.doFilter(arg0, arg1); return; }else{ //余下的全跳到登陆界面 response.sendRedirect(request.getContextPath() + "/login.htm"); return; } } public void init(FilterConfig arg0) throws ServletException { } }

package com.nono.Controller; import java.util.ArrayList; import java.util.HashMap; import java.util.Vector; import javax.jms.Session; import javax.print.DocFlavor.STRING; import javax.print.attribute.HashAttributeSet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import net.sf.json.JSONArray; import org.omg.CORBA.PUBLIC_MEMBER; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import com.nono.po.Content; import com.nono.po.Contents; import com.nono.po.User; import com.nono.po.Users; @Controller public class MainController { //用户和用户组; @Autowired Users users; @Autowired Contents contents; @RequestMapping(value="login", method=RequestMethod.GET) public String login (HttpServletRequest request) { return "login"; } @RequestMapping(value="login", method=RequestMethod.POST) public String loginPOST ( HttpServletRequest request, HttpServletResponse response ) { String string = "login"; String name = (String) request.getParameter("name"); Boolean flag = true; //如果名字不是空的话; if( !name.equals("") ) { Vector vector = users.getList(); for(int i=0; i< vector.size(); i++) { User user = (User) vector.elementAt(i); if( user.getName().equals( name ) ) { flag = false; }; }; }; //用户名不存在 if( flag ) { User user = new User(); user.setName( name ); HttpSession session = request.getSession(true); //设置Session的过期时间为10分钟 session.setMaxInactiveInterval(600); //设置seesion中的用户信息; session.setAttribute("user", user); //添加用户; users.addUser( user ); //加入的提示; Content content = new Content(); content.setName( name ); content.setContent( "enter the chat room!" ); contents.addContent( content ); string = "chat"; return string; }else{ //用户名已经存在 request.setAttribute("info", "用户名已经存在1"); string = "login"; return string; } } @RequestMapping(value="chat", method=RequestMethod.GET) public String main (HttpServletRequest request) { String string = "chat"; return string; } @RequestMapping(value="chat", method=RequestMethod.POST) @ResponseBody public String chat(HttpServletRequest request) { String string = (String) request.getParameter("content"); HttpSession session = request.getSession(); //设置seesion中的用户信息; User user = (User) session.getAttribute("user"); String name = user.getName(); Content content = new Content(); content.setName( name ); content.setContent( string ); contents.addContent( content ); return "true"; } @RequestMapping(value="getList", method=RequestMethod.POST, produces = "text/html;charset=UTF-8") @ResponseBody public String getList( HttpServletRequest request) { return JSONArray.fromObject( users.getList() ).toString(); } @RequestMapping(value="getContent", method=RequestMethod.POST, produces = "text/html;charset=UTF-8") @ResponseBody public String getArrayList() { ArrayList list = (ArrayList) contents.getContents(); ArrayList result = new ArrayList(); for( int i= 0; i< list.size(); i++ ) { HashMap hashMap = new HashMap(); hashMap.put("name", ((Content)list.get(i)).getName()); hashMap.put("content", ((Content)list.get(i)).getContent()); result.add( hashMap ); }; return JSONArray.fromObject( result ).toString(); } }

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怎么用javaweb实现在线聊天工具

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