我正在尝试使用 Java Websocket API (1.0)- JSR 356 中指定的带注释端点在 tomcat 7.0.50 上实现 websocket。以下是我如何对其进行编码的简要步骤
1)使用@ServerEndpoint注解编写websocket端点
2)实现@onOpen和@onMessage方法
3)在谷歌浏览器上使用javascript打开一个websocket。
请按顺序查找上述步骤对应的代码
1) 第 1 步和第 2 步 - 编写 websocket 服务器端点:
package com.jkweb.websocket;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.websocket.EndpointConfig;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ServerEndpoint(value="/websocket/fileuploadtracker")
@OnOpen
public void open(Session session,EndpointConfig config) {
......
}
@OnMessage
public void onMessage(Session session, String msg) {
try {
session.getBasicRemote().sendText(msg);
} catch (IOException e) {
logger.error(e.getMessage());
}
}
public static void sendMessage(String uniqueTocken,String msg){
try {
Session wsSession = socketConnectionMap.get(uniqueTocken);
wsSession.getBasicRemote().sendText(msg);
} catch (IOException e) {
logger.error(e.getMessage());
}
}
}
2) 第 3 步 - 在 Chrome 中使用 javascript api 打开 websocket:
wsurl = "ws://localhost:8080/jkweb/websocket/fileuploadtracker",
ws;
ws = new WebSocket(wsurl);
ws.onopen = function()
{
// Web Socket is connected, send data using send()
ws.send("Sending first Message");
alert("Message is sent...");
};
ws.onmessage = function (evt)
{
var received_msg = evt.data;
alert("Message is received...");
};
ws.onclose = function(evt)
{
// websocket is closed.
alert("Connection is closed..."+evt.code + ":"+evt.reason );
};
我正在使用以下版本的软件:
1) 雄猫 - 7.0.50
2) Java - 1.7.45
3)Servlet - 3.0
4) 已包含以下 Maven 依赖项
5) 铬 - 32.0.1700.107m
<dependency>
<groupId>javax.websocket</groupId>
<artifactId>javax.websocket-api</artifactId>
<version>1.0</version>
<scope>provided</scope>
</dependency>
但是我收到以下错误,并且在 chrome 控制台中连接已关闭,错误代码为 1066:
WebSocket connection to 'ws://localhost:8080/jkweb/websocket/fileuploadtracker' failed: Error during WebSocket handshake: Unexpected response code: 404
有没有我遗漏的配置。我尝试搜索很多但找不到任何东西。请尽快解决这个问题。