这篇文章主要介绍了Springboot之整合Socket连接案例，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧
Socket连接与硬件通信
一、如何让socket随着springboot项目一起启动
SpringBoot中CommandLineRunner的作用：平常开发中有可能需要实现在项目启动后执行的功能，SpringBoot提供的一种简单的实现方案就是添加一个model并实现CommandLineRunner接口，实现功能的代码放在实现的run方法中
具体实现
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.CommandLineRunner; import org.springframework.stereotype.Component; import java.net.ServerSocket; import java.net.socket; import java.util.concurrent.ArrayBlockingQueue; import java.util.concurrent.ThreadPoolExecutor; import java.util.concurrent.TimeUnit; /** * @author 易水●墨龙吟 * @Description * @create 2019-04-14 23:40 */ @Component public class TestRunner implements CommandLineRunner { @Autowired private SocketProperties properties; @Override public void run(String... args) throws Exception { ServerSocket server = null; Socket socket = null; server = new ServerSocket(properties.getPort()); System.out.println("设备服务器已经开启, 监听端口:" + properties.getPort()); ThreadPoolExecutor pool = new ThreadPoolExecutor( properties.getPoolCore(), properties.getPoolMax(), properties.getPoolKeep(), TimeUnit.SECONDS, new ArrayBlockingQueue(properties.getPoolQueueInit()), new ThreadPoolExecutor.discardOldestPolicy() ); while (true) { socket = server.accept(); pool.execute(new ServerConfig(socket)); } } }
此处使用了自定义的线程池，提高对于socket的客户端处理能力。
二、自定义配置并使用
此处将socket的端口和线程池的一些配置放到 application.yml中使用，方便使用和修改
# Socket配置 socket: # 监听端口 2323 port: 2323 # 线程池 - 保持线程数 20 pool-keep: 20 # 线程池 - 核心线程数 10 pool-core: 10 # 线程池 - 最大线程数 20 pool-max: 30 # 线程队列容量 10 pool-queue-init: 10
import lombok.Getter; import lombok.Setter; import lombok.ToString; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; import org.springframework.stereotype.Component; /** * @author 易水●墨龙吟 * @Description * @create 2019-04-18 22:35 */ @Setter @Getter @ToString @Component @Configuration @PropertySource("classpath:application.yml") @ConfigurationProperties(prefix = "socket") public class SocketProperties { private Integer port; private Integer poolKeep; private Integer poolCore; private Integer poolMax; private Integer poolQueueInit; }
三、Socket对于客户端发来的信息的处理和重发机制
当客户端端连接之后发送信息，如果超时未发送，将会关闭，发送数据有异常将会返回给客户端一个error，让客户端在发送一次数据。
import com.farm.config.socket.resolve.MessageChain; import com.farm.service.EnvironmentService; import com.farm.service.impl.EnvironmentServiceImpl; import java.io.*; import java.net.socket; import java.net.socketException; import java.net.socketTimeoutException; import java.util.Map; /** * @author 易水●墨龙吟 * @Description * @create 2019-04-14 23:21 */ public class ServerConfig extends Thread { private Socket socket; public ServerConfig(Socket socket) { this.socket = socket; } // 获取spring容器管理的类，可以获取到sevrice的类 private EnvironmentService service = SpringUtil.getBean(EnvironmentServiceImpl.class); private String handle(InputStream inputStream) throws IOException, DataFormException { byte[] bytes = new byte[1024]; int len = inputStream.read(bytes); if (len != -1) { StringBuffer request = new StringBuffer(); request.append(new String(bytes, 0, len, "UTF-8")); System.out.println("接受的数据: " + request); System.out.println("from client ... " + request + "当前线程" + Thread.currentThread().getName()); Map map = MessageChain.out(request.toString()); System.out.println("处理的数据" + map); Integer res = service.addEnvironment(map); if (res == 1) { return "ok"; } else { throw new DataFormException("数据处理异常"); } } else { throw new DataFormException("数据处理异常"); } } @Override public void run() { BufferedWriter writer = null; try { // 设置连接超时9秒 socket.setSoTimeout(9000); System.out.println("客户 - " + socket.getRemoteSocketAddress() + " -> 机连接成功"); InputStream inputStream = socket.getInputStream(); writer = new BufferedWriter(new OutputStreamWriter(socket.getoutputStream())); String result = null; try { result = handle(inputStream); writer.write(result); writer.newLine(); writer.flush(); } catch (IOException | DataFormException | IllegalArgumentException e) { writer.write("error"); writer.newLine(); writer.flush(); System.out.println("发生异常"); try { System.out.println("再次接受!"); result = handle(inputStream); writer.write(result); writer.newLine(); writer.flush(); } catch (DataFormException | SocketTimeoutException ex) { System.out.println("再次接受, 发生异常,连接关闭"); } } } catch (SocketException socketException) { socketException.printstacktrace(); try { writer.close(); } catch (IOException ioException) { ioException.printstacktrace(); } } catch (IOException e) { e.printstacktrace(); } finally { try { writer.close(); } catch (IOException e) { e.printstacktrace(); } } } }
在此处有一个坑，如果客户端是用C/C++编写的，必须使用如下方法：
byte[] bytes = new byte[1024]; int len = inputStream.read(bytes);
如果使用readLine或者 DataInputStream dataInputStream =new DataInputStream(socket.getInputStream())这样会出现使用TCP连接助手，客户端发送数据收不到。
四、如何在普通类中使用Spring注入类
这里需要使用一个工具类。
import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.stereotype.Component; /** * @author 易水●墨龙吟 * @Description * @create 2019-04-15 0:01 */ @Component public class SpringUtil implements ApplicationContextAware { private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { if (SpringUtil.applicationContext == null) { SpringUtil.applicationContext = applicationContext; } } /** * 获取applicationContext * @return */ public static ApplicationContext getApplicationContext() { return applicationContext; } /** * 通过name获取 Bean. * @param name * @return */ public static Object getBean(String name){ return getApplicationContext().getBean(name); } /** * 通过class获取Bean. * @param clazz * @param * @return */ public static T getBean(Class clazz){ return getApplicationContext().getBean(clazz); } /** * 通过name,以及Clazz返回指定的Bean * @param name * @param clazz * @param * @return */ public static T getBean(String name,Class clazz){ return getApplicationContext().getBean(name, clazz); } }
补充：springboot下websocket前台后端数据长连接
首先导入依赖
org.springframework.bootspring-boot-starter-websocketorg.springframework.securityspring-security-messaging
spring-security-messaging 是后面继承 AbstractSecurityWebSocketMessagebrokerConfigurer需要用到的依赖
WebSocketConfig
@Configuration @EnableWebSocketMessagebroker //此注解表示使用STOMP协议来传输基于消息代理的消息，此时可以在@Controller类中使用@MessageMapping public class WebSocketConfig implements WebSocketMessagebrokerConfigurer { @Override public void registerStompEndpoints(StompEndpointRegistry registry) { /** * 注册 Stomp的端点 * addEndpoint：添加STOMP协议的端点。这个HTTP URL是供WebSocket或SockJS客户端访问的地址 * withSockJS：指定端点使用SockJS协议 */ registry.addEndpoint("/websocket/tracker") //物流消息通道, .setAllowedOrigins("*") //允许跨域,里面路径可以设定 .withSockJS() //指定协议 .setInterceptors(httpSessionHandshakeInterceptor()) ; //设置拦截器() } @Override public void configureMessagebroker(MessagebrokerRegistry registry) { /** * 配置消息代理 * 启动简单broker，消息的发送的地址符合配置的前缀来的消息才发送到这个broker */ registry.enableSimplebroker("/topic","/user"); } //拦截器 @Bean public HandshakeInterceptor httpSessionHandshakeInterceptor() { return new HandshakeInterceptor() { @Override public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map attributes) throws Exception { //可以在这里先判断登录是否合法 return true; } @Override public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception exception) { //握手成功后, } }; } }
WebsocketSecurityConfiguration
@Configuration public class WebsocketSecurityConfiguration extends AbstractSecurityWebSocketMessagebrokerConfigurer { @Override protected void configureInbound(MessageSecurityMetadataSourceRegistry messages) { messages .nullDestMatcher().authenticated() .simpDestMatchers("/topic/**").authenticated() .simpDestMatchers("/user/**").authenticated() .simpTypeMatchers(SimpMessageType.MESSAGE, SimpMessageType.SUBSCRIBE).denyAll() // catch all .anyMessage().denyAll(); } /** * disables CSRF for Websockets. */ @Override protected boolean sameOrigindisabled() { return true; } }
WebSocketResource
package com.gleam.shopmall.web.rest; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationListener; import org.springframework.messaging.handler.annotation.MessageMapping; import org.springframework.messaging.handler.annotation.SendTo; import org.springframework.messaging.simp.SimpMessageHeaderAccessor; import org.springframework.messaging.simp.SimpMessageMappingInfo; import org.springframework.messaging.simp.SimpMessageSendingOperations; import org.springframework.stereotype.Controller; import org.springframework.web.socket.messaging.SessiondisconnectEvent; @Controller public class WebSocketResource { private static final Logger log = LoggerFactory.getLogger(WebSocketResource.class); @Autowired SimpMessageSendingOperations messagingTemplate; //此方法适用于网页聊天室,从前端接收数据,返回订阅者(前端) @MessageMapping("/welcome") //指定要接收消息的地址，类似@RequestMapping @SendTo("/topic/getResponse") //默认消息将被发送到与传入消息相同的目的地，但是目的地前面附加前缀（默认情况下为“/topic”} public String say(String message) throws Exception { return message; } //发送指定用户(直接从后端发送数据到前端) public void sendToUser(String login,String channel, String info) { log.debug("[ToUser]WEBSOCKET发送消息, username={}, info={}", login, info); this.messagingTemplate.convertAndSendToUser(login, channel, info); log.debug("[ToUser]WEBSOCKET发送消息：完成"); } //发送所有订阅的(直接从后端发送数据到前端) public void send(String channel, String info) { log.debug("[ToAll]WEBSOCKET发送消息, info={}", info); // this.messagingTemplate.convertAndSend(channel, info); this.messagingTemplate.convertAndSend("/topic/getResponse", "接收到了吗?"); log.debug("[ToAll]WEBSOCKET发送消息：完成"); } }
前端html
Spring Boot+WebSocket+广播式
貌似你的浏览器不支持websocket
连接断开连接输入内容发送
```
以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程之家。如有错误或未考虑完全的地方，望不吝赐教。
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