Spring Cloud Gateway转发Spring WebSocket

时间 2020-07-08 标签 spring cloud gateway 转发 websocket

模拟一个广播弹幕的websocket。gateway经过eureka注册中心拉取服务进行转发websocketjavascript

1.搭建 Spring WebSocket

1.1 pom.xml websocket maven依赖

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>

1.2 application.yml 配置文件

spring:
application:
name: bullet
server:
port: 5678
eureka:
client:
serviceUrl:
defaultZone: http://localhost:1025/eureka/

1.3 BulletApplication websocket启动程序

@SpringBootApplication
public class BulletApplication {
public static void main(String[] args) {
SpringApplication.run(BulletApplication.class, args);
}
}

1.4 WebSocketAutoConfig websocket配置类

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketAutoConfig implements WebSocketMessageBrokerConfigurer {
@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/bullet") //开启/bullet端点
.setAllowedOrigins("*") //容许跨域访问
.withSockJS(); //使用sockJS
}
@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
registry.enableSimpleBroker("/toAll"); //订阅Broker名称
}
}

1.5 BulletMessageVO类

使用lombok的@Getter和@Setter注解来自动生成get、set方法css

@Getter
@Setter
public class BulletMessageVO {
String username;
String message;
}

1.6 BulletController websocket控制器

@Controller
public class BulletController {
@MessageMapping("/chat")
@SendTo("/toAll/bulletScreen") //SendTo 发送至 Broker 下的指定订阅路径
public String say(BulletMessageVO clientMessage) {
String result=null;
if (clientMessage!=null){
result=clientMessage.getUsername()+":"+clientMessage.getMessage();
}
return result;
}
}

2 搭建 Spring Cloud Gateway

2.1 pom.xml gateway网关maven依赖

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>

2.2 application.yml gateway网关配置文件

spring:
application:
name: gateway
gateway:
routes:
- id: bulletscreen
# 重点！/info必须使用http进行转发，lb表明从注册中心获取服务
uri: lb://bullet
predicates:
# 重点！转发该路径！
- Path=/bullet/info/**
- id: bulletscreen
# 重点！lb:ws://表明从注册中心获取服务，而且转发协议为websocket，这种格式怀疑人生！
uri: lb:ws://bullet
predicates:
# 转发/bullet端点下的全部路径
- Path=/bullet/**
server:
port: 8888
eureka:
client:
serviceUrl:
defaultZone: http://localhost:1025/eureka/

2.3 GatewayApplication gateway启动类

@SpringCloudApplication
public class GatewayApplication {
public static void main(String[] args) {
SpringApplication.run(GatewayApplication.class, args);
}
}

3 编写html

这个是从网上找来的html代码，能够保存到本地文件，不须要放入服务里面html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Spring Boot WebSocket+广播式</title>
</head>
<body onload="disconnect()">
<noscript>
<h2 style="color:#ff0000">貌似你的浏览器不支持websocket</h2>
</noscript>
<div>
<div>
<button id="connect" onclick="connect()">链接</button>
<button id="disconnect" onclick="disconnect();">断开链接</button>
</div>
<div id="conversationDiv">
<label>输入你的名字</label> <input type="text" id="name" />
<br>
<label>输入消息</label> <input type="text" id="messgae" />
<button id="send" onclick="send();">发送</button>
<p id="response"></p>
</div>
</div>
<script src="https://cdn.bootcss.com/sockjs-client/1.1.4/sockjs.min.js"></script>
<script src="https://cdn.bootcss.com/stomp.js/2.3.3/stomp.min.js"></script>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
var stompClient = null;
//gateway网关的地址
var host="http://127.0.0.1:8888";
function setConnected(connected) {
document.getElementById('connect').disabled = connected;
document.getElementById('disconnect').disabled = !connected;
document.getElementById('conversationDiv').style.visibility = connected ? 'visible' : 'hidden';
$('#response').html();
}
function connect() {
//地址+端点路径，构建websocket连接地址
var socket = new SockJS(host+'/bullet');
stompClient = Stomp.over(socket);
stompClient.connect({}, function(frame) {
setConnected(true);
console.log('Connected:' + frame);
//监听的路径以及回调
stompClient.subscribe('/toAll/bulletScreen', function(response) {
showResponse(response.body);
});
});
}
function disconnect() {
if (stompClient != null) {
stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}
function send() {
var name = $('#name').val();
var message = $('#messgae').val();
//发送消息的路径
stompClient.send("/chat", {}, JSON.stringify({username:name,message:message}));
}
function showResponse(message) {
var response = $('#response');
response.html(message);
}
</script>
</body>
</html>

4 启动程序

启动Eureka 服务端，开启注册中心
启动Bullet WebSocket程序
启动GateWay网关

5 测试程序

开启多个html页面，并打开控制台
java
在多个页面中点击链接按钮，观察控制台是否链接成功
jquery

输入名字和消息，观察是否成功进行广播

6 源码

https://github.com/naah69/SpringCloud-Gateway-WebSocket-Demogit