菜鸟从零开始初始WebSocket －Server篇

这篇主要参考了 http://blog.csdn.net/wilsonke/article/details/22397819 的步骤：

1. 服务器端实现(Tomcat)

用Java实现的websocket，在Server端是通过Tomcat内嵌支持的，我们需要开发一个继承WebSocketServlet 的servlet就可以了，与普通的HttpServlet没有太大区别。

1). JAVA环境：

• Java: jdk 1.6.0_45, Server VM 64bit
• Maven: 3.0.5
• Tomcat: 7.0.39.0

~ D:\workspace\java>java -version
java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)

~ D:\workspace\java>mvn -version
Apache Maven 3.0.5 (r01de14724cdef164cd33c7c8c2fe155faf9602da; 2013-02-19 21:51:28+0800)
Maven home: D:\toolkit\maven3\bin\..
Java version: 1.6.0_45, vendor: Sun Microsystems Inc.
Java home: D:\toolkit\java\jdk6\jre
Default locale: zh_CN, platform encoding: GBK
OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"

~ D:\toolkit\tomcat7\bin>catalina.bat version
Using CATALINA_BASE:   "D:\toolkit\tomcat7"
Using CATALINA_HOME:   "D:\toolkit\tomcat7"
Using CATALINA_TMPDIR: "D:\toolkit\tomcat7\temp"
Using JRE_HOME:        "D:\toolkit\java\jdk6"
Using CLASSPATH:       "D:\toolkit\tomcat7\bin\bootstrap.jar;D:\toolkit\tomcat7\bin\tomcat-juli.jar"
Server version: Apache Tomcat/7.0.39
Server built:   Mar 22 2013 12:37:24
Server number:  7.0.39.0
OS Name:        Windows 7
OS Version:     6.1
Architecture:   amd64
JVM Version:    1.6.0_45-b06
JVM Vendor:     Sun Microsystems Inc.

2). maven构建一个简单的webapp项目。

~ D:\workspace\java>mvn archetype:generate -DgroupId=org.conan.websocket -DartifactId=websocketServer -DarchetypeArtifactId=maven-archetype-webapp

[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Old (1.x) Archetype: maven-archetype-webapp:1.0
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: groupId, Value: org.conan.websocket
[INFO] Parameter: packageName, Value: org.conan.websocket
[INFO] Parameter: package, Value: org.conan.websocket
[INFO] Parameter: artifactId, Value: websocketServer
[INFO] Parameter: basedir, Value: D:\workspace\java
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] project created from Old (1.x) Archetype in dir: D:\workspace\java\websocketServer
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1:42.200s
[INFO] Finished at: Tue Aug 20 13:57:05 CST 2013
[INFO] Final Memory: 9M/179M
[INFO] ------------------------------------------------------------------------

3). 配置项目目录

~ D:\workspace\java>cd websocketServer
~ D:\workspace\java\websocketServer>mkdir src\main\java
~ D:\workspace\java\websocketServer>rm src\main\webapp\index.jsp

导入到Eclipse的项目截图

4). 编辑pom.xml配置文件，增加tomcat的依赖

~ vi pom.xml

4.0.0
org.conan.websocket
websocketServer
war
1.0-SNAPSHOT
websocketServer Maven Webapp
http://maven.apache.org


org.apache.tomcat
tomcat-catalina
7.0.27
provided


org.apache.tomcat
tomcat-coyote
7.0.39
provided



websocketServer

下载并安装类库

~ D:\workspace\java\websocketServer>mvn clean install

5). 创建DemoServlet，服务器端运行类

~ vi src/main/java/org/conan/websocket/DemoServlet.java

package org.conan.websocket;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.ArrayList;

import javax.servlet.http.HttpServletRequest;

import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;
import org.apache.catalina.websocket.WsOutbound;

public class DemoServlet extends WebSocketServlet {

    private static final long serialVersionUID = -4853540828121130946L;
    private static ArrayList mmiList = new ArrayList();

    @Override
    protected StreamInbound createWebSocketInbound(String str, HttpServletRequest request) {
        return new MyMessageInbound();
    }

    private class MyMessageInbound extends MessageInbound {
        WsOutbound myoutbound;

        @Override
        public void onOpen(WsOutbound outbound) {
            try {
                System.out.println("Open Client.");
                this.myoutbound = outbound;
                mmiList.add(this);
                outbound.writeTextMessage(CharBuffer.wrap("Hello!"));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onClose(int status) {
            System.out.println("Close Client.");
            mmiList.remove(this);
        }

        @Override
        public void onTextMessage(CharBuffer cb) throws IOException {
            System.out.println("Accept Message : " + cb);
            for (MyMessageInbound mmib : mmiList) {
                CharBuffer buffer = CharBuffer.wrap(cb);
                mmib.myoutbound.writeTextMessage(buffer);
                mmib.myoutbound.flush();
            }
        }

        @Override
        public void onBinaryMessage(ByteBuffer bb) throws IOException {
        }
    }

}

6). 修改web.xml文件

~ vi src/main/webapp/WEB-INF/web.xml



Archetype Created Web Application

wsServlet
org.conan.websocket.DemoServlet


wsServlet
/wsServlet




7). 编译，打包，部署到tomcat

~ D:\workspace\java\websocketServer>mvn clean install

这个时候可以打成war包了，  可是怎么传到本地的JBOSS上面没反应呢。。。 再找找原因