本文主要是介绍JAVA：使用ServerSocket实现多线程的服务器功能，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
目录
一、服务端
二、Task任务类。
三、客户端请求
一、服务端
创建数据源，并实现ServerSocket，当有连接进来时，创建Task任务类，交由线程池处理，主程序在s.accept();继续等待新的连接（这个等待是阻塞制的）。
package socket;import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;import org.apache.tomcat.jdbc.pool.DataSource;/*** 多线程的serverSocket* @author Administrator**/
public class M {public static void main(String[] args) {// 配置数据源DataSource dataSource = new DataSource();dataSource.setUrl("jdbc:mysql://127.0.0.1:3306/plc?characterEncoding=UTF8");dataSource.setUsername("root");dataSource.setPassword("111111");dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");dataSource.setValidationQuery("select 1 from dual");dataSource.setTestWhileIdle(true);dataSource.setTimeBetweenEvictionRunsMillis(30000);dataSource.setMinIdle(5);dataSource.setInitialSize(5);System.out.println(dataSource.getMinIdle());System.out.println(dataSource.getMaxIdle());System.out.println(dataSource.getMaxActive());System.out.println(dataSource.getIdle());System.out.println(dataSource.getActive());try(ServerSocket s = new ServerSocket(2001)){ExecutorService pool = Executors.newFixedThreadPool(3);while(true) {Socket socket = s.accept();pool.execute(new Task(socket,dataSource));ThreadPoolExecutor t = (ThreadPoolExecutor)pool;System.out.println("active:"+t.getActiveCount());System.out.println("core:"+t.getCorePoolSize());System.out.println("TaskCount"+t.getTaskCount());}} catch (IOException e) {e.printStackTrace();}}}
二、Task任务类。
任务类里，通过socket.getInputStream()构建Scanner，从而读取请求信息（字符串），将字符串解析之后存入数据库。完成数据入库后，通过socket.getOutputStream()构建PrintWriter,从而写入信息返回给客户端。
package socket;import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Scanner;import org.apache.tomcat.jdbc.pool.DataSource;public class Task implements Runnable {private Socket socket;private DataSource dataSource;public Task(Socket socket,DataSource dataSource) {super();this.socket = socket;this.dataSource = dataSource;}@Overridepublic void run() {try (InputStream inputStream = this.socket.getInputStream();Scanner scanner = new Scanner(inputStream);OutputStream out = socket.getOutputStream();PrintWriter pw = new PrintWriter(out);){boolean flag = true;while(flag && scanner.hasNextLine()) {String line = scanner.nextLine();if(line.trim().equals("exit")) {flag = false;pw.write("End");pw.flush();continue;}// 放入线程池，进行数据入库。try (Connection connection = dataSource.getConnection();){// line 入库// 业务逻辑SSSString[] split = line.split("\\|");if (split.length != 9 && split.length != 10) {throw new Exception("异常，数据应该为9列或10列");}String sql2 = "insert into plc_first4(ser_no,gong_xu_hao,niu_ju,jiao_du,ok_ng,gong_ju_hao,da_yin_ma,create_time)"+ "values (?,?,?,?,?,?,?,now())";PreparedStatement statement2 = connection.prepareStatement(sql2);statement2.setString(1, split[0]);statement2.setString(2, split[3]);statement2.setString(3, split[4]);statement2.setString(4, split[5]);statement2.setString(5, split[6]);statement2.setString(6, split[7]);statement2.setString(7, split[8]);statement2.execute();statement2.close();pw.write("e");pw.flush();// 业务逻辑EEEconnection.close();} catch (Exception e) {pw.write("f");pw.flush();e.printStackTrace();}}socket.close();} catch (IOException e) {e.printStackTrace();}}}
三、客户端请求
构建Socket对象，通过client.getOutputStream();获取输出流，写入请求信息。完成之后获取输入流，从而读取服务端返回的信息，并打印出来。
package socket;import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
/*** 客户端请求* @author Administrator**/
public class Client {public static void main(String[] args) throws Exception {String ip ="127.0.0.1";Socket client = new Socket(ip, 2001);OutputStream outputStream = client.getOutputStream();outputStream.write("7005315-HS01*20240426001|1|1,3,4,2,8,P|1|8.67|0|OK| OP10|0|\n".getBytes());InputStream inputStream = client.getInputStream();byte[] b = new byte[1024];int read = inputStream.read(b);System.out.println(""+new String(b,0,read));outputStream.flush();client.shutdownOutput();client.close();}}
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