Springboot之整合Socket连接代码示例

本篇文章小编给大家分享一下Springboot之整合Socket连接代码示例，文章代码介绍的很详细，小编觉得挺不错的，现在分享给大家供大家参考，有需要的小伙伴们可以来看看。

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);
  }
}