java web 弹幕技术实现

先放入效果图

实现环节

1-前端实现将把信息发送到后台和接收后台发送过来的信息并且将其发射弹幕到浏览器上

2-通过websocket与每个服务端连接，当接收到来自任何一个前端发来的信息，就将该信息群发至所有的客户端(也就是浏览器)

客户端(浏览器)的代码如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name="Keywords" content="danmu">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>弹幕网站</title>
<style type="text/css">
body {
background: url(images/01.jpg); no-repeat top center;
font-size: 12px;
font-family: "微软雅黑";
}

* {
margin: 0;
padding: 0;
}
/* screen start*/
.screen {
width: 300px;
height: 100px;
background: #669900;
}

.dm {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
display: none;
}

.dm .d_screen .d_del {
width: 38px;
height: 38px;
background: #600;
display: block;
text-align: center;
line-height: 38px;
text-decoration: none;
font-size: 20px;
color: #fff;
border-radius: 19px;
border: 1px solid #fff;
z-index: 2;
position: absolute;
right: 20px;
top: 20px;
outline: none;
}

.dm .d_screen .d_del:hover {
background: #F00;
}

.dm .d_screen .d_mask {
width: 100%;
height: 100%;
background: #000;
position: absolute;
top: 0;
left: 0;
opacity: 0.6;
filter: alpha(opacity = 60);
z-index: 1;
}

.dm .d_screen .d_show {
position: relative;
z-index: 2;
}

.dm .d_screen .d_show div {
font-size: 26px;
line-height: 36px;
font-weight: 500;
position: absolute;
top: 76px;
left: 10;
color: #fff;
}
/*end screen*/

/*send start*/
.send {
width: 100%;
height: 76px;
position: absolute;
bottom: 0;
left: 0;
border: 1px solid red;
}

.send .s_filter {
width: 100%;
height: 76px;
background: #000;
position: absolute;
bottom: 0;
left: 0;
opacity: 0.6;
filter: alpha(opacity = 60);
}

.send .s_con {
width: 100%;
height: 76px;
position: absolute;
top: 0;
left: 0;
z-index: 2;
text-align: center;
line-height: 76px;
}

.send .s_con .s_text {
width: 800px;
height: 36px;
border: 0;
border-radius: 6px 0 0 6px;
outline: none;
}

.send .s_con .s_submit {
width: 100px;
height: 36px;
border-radius: 0 6px 6px 0;
outline: none;
font-size: 14px;
color: #fff;
background: #65c33d;
font-family: "微软雅黑";
cursor: pointer;
border: 1px solid #5bba32;
}

.send .s_con .s_submit:hover {
background: #3eaf0e;
}
/*end send*/
</style>

</head>
<body>
<a href="#" id="startDm">开启弹幕</a>

<div class="dm">

<div class="d_screen">
<a href="#" class="d_del">X</a>
<div class="d_mask"></div>
<div class="d_show">
</div>
</div>



<div class="send">
<div class="s_filter"></div>
<div class="s_con">
<input type="text" class="s_text" /> <input type="button"
value="发表评论" class="s_submit" id="btn"/>
</div>
</div>

</div>

<script type="text/javascript"
src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.0.js"></script>
<script type="text/javascript" src="websocket.js"></script>
<script type="text/javascript">
$(function() {

$("#startDm,.d_del").click(function() {
$("#startDm,.dm").toggle(1000);
//init_screen();
});
$("#btn").click(function(){
send();
});
$(".s_text").keydown(function() {
var code = window.event.keyCode;

if (code == 13)//回车键按下时，输出到弹幕

{
send();
}
});

});

function launch()
{

var _height = $(window).height();
var _left = $(window).width() - $("#"+index).width();
var time=10000;
if(index%2==0)
time=20000;
_top+=80;
if(_top>_height-100)
_top=80;
$("#"+index).css({
left:_left,
top:_top,
color:getRandomColor()

});
$("#"+index).animate({
left:"-"+_left+"px"},
time,
function(){});
index++;
}

/* //初始化弹幕
function init_screen() {
var _top = 0;
var _height = $(window).height();
$(".d_show").find("div").show().each(function() {
var _left = $(window).width() - $(this).width();
var time=10000;
if($(this).index()%2==0)
time=20000;
_top+=80;
if(_top>_height-100)
_top=80;
$(this).css({
left:_left,
top:_top,
color:getRandomColor()

});
$(this).animate({
left:"-"+_left+"px"},
time,
function(){});

});
} */

//随机获取颜色值
function getRandomColor() {
return '#' + (function(h) {
return new Array(7 - h.length).join("0") + h
})((Math.random() * 0x1000000 << 0).toString(16))
}
</script>

</body>
</html>

websocket.js文件代码

var websocket=null;
var _top=80;
var index=0;

服务端代码

package com.danmu.websocket;

import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

//每个客户端连接成功的时候在后台都会创建一个相应的MyWebsocket类
@ServerEndpoint("/websocket")
public class MyWebsocket {

//concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。若要实现服务端与单一客户端通信的话，可以使用Map来存放，其中Key可以为用户标识
private static CopyOnWriteArraySet<MyWebsocket> websocketPools=new CopyOnWriteArraySet<MyWebsocket>();

//与某个客户端的连接会话，需要通过它来给客户端发送数据
private Session session;

/**
* 连接建立成功调用的方法
* @param session 可选的参数。session为与某个客户端的连接会话，需要通过它来给客户端发送数据
*/
@OnOpen
public void onOpen(Session session)
{
this.session=session;
websocketPools.add(this);
}

@OnClose
public void onClose()
{
websocketPools.remove(this);
}

@OnMessage
public void onMessage(String message,Session session)
{
for(MyWebsocket item:websocketPools)
{
try {
item.send(message);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

private void send(String message) throws IOException{
this.session.getAsyncRemote().sendText(message);
//this.session.getBasicRemote().sendText(message);

}

@OnError
public void onError(Session session, Throwable error)
{
System.out.println("发生错误");
error.printStackTrace();
}

}

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java web 弹幕技术实现

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