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环境#xff1a; JDK#xff1a;64位 Jdk1.8 SpringBoot#xff1a;2.1.7.RELEASE
功能#xff1a; 使用Java中原生的NIO监听端口接受客户端的数据#xff0c;并发送数据给客户端。
服务端
相关配置
application.ym… 文章目录 前言服务端相关配置核心代码 客户端 前言
环境 JDK64位 Jdk1.8 SpringBoot2.1.7.RELEASE
功能 使用Java中原生的NIO监听端口接受客户端的数据并发送数据给客户端。
服务端
相关配置
application.yml
socket:port: 9991bufferSize: 2048timeout: 3000配置类
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;/*** author qf* since 2024/10/08 21:20*/
Component
ConfigurationProperties(prefix socket)
Setter
Getter
ToString
public class NioSocketConfig {private Integer port;private Integer bufferSize;private Integer timeout;
}核心代码
CommandLineRunner 当应用程序启动时CommandLineRunner 接口的实现类中的 run 方法会被调用
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;/*** author qf* since 2024/10/08 21:25*/
Slf4j
Component
public class CommandLineRunnerImpl implements CommandLineRunner {private NioSocketConfig nioSocketConfig;Autowiredpublic CommandLineRunnerImpl(NioSocketConfig nioSocketConfig) {this.nioSocketConfig nioSocketConfig;}Overridepublic void run(String... args) {ServerSelector serverSelector new ServerSelector(nioSocketConfig);log.info(-----------监听端口启动成功-----------);serverSelector.server();}
}服务类
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.util.Iterator;/*** NIO Socket Server* author qf* since 2024/10/08 21:30*/
Slf4j
public class ServerSelector {private NioSocketConfig nioSocketConfig;public ServerSelector(NioSocketConfig nioSocketConfig){this.nioSocketConfig nioSocketConfig;}Beanpublic void server() {Selector selector null;Protocol protocol null;try {// 实例化一个信道ServerSocketChannel serverSocketChannel ServerSocketChannel.open();// 将该信道绑定到指定端口serverSocketChannel.bind(new InetSocketAddress(nioSocketConfig.getPort()));// 配置信道为非阻塞模式serverSocketChannel.configureBlocking(false);// 创建一个选择器selector Selector.open();// 将选择器注册到各个信道serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);// 初始化事件处理器protocol new EchoSelectorProtocol(nioSocketConfig.getBufferSize());} catch (IOException e) {log.error(粒径设备监听10091端口时发生异常,e);}// 不断轮询select方法获取准备好的信道所关联的Key集while (true) {try {if (selector null || protocol null) {break;}Thread.sleep(100);// 一直等待,直至有信道准备好了I/O操作if (selector.select(nioSocketConfig.getTimeout()) 0) {// 在等待信道准备的同时也可以异步地执行其他任务continue;}// 获取准备好的信道所关联的Key集合的iterator实例IteratorSelectionKey iterator selector.selectedKeys().iterator();// 循环取得集合中的每个键值while (iterator.hasNext()) {SelectionKey selectionKey iterator.next();// 如果服务端信道感兴趣的I/O操作为acceptif (selectionKey.isValid() selectionKey.isAcceptable()) {protocol.handleAccept(selectionKey);}// 如果客户端信道感兴趣的I/O操作为readif (selectionKey.isValid() selectionKey.isReadable()) {protocol.handleRead(selectionKey);}// 如果该键值有效并且其对应的客户端信道感兴趣的I/O操作为writeif (selectionKey.isValid() selectionKey.isWritable()) {protocol.handleWrite(selectionKey);}// 这里需要手动从键集中移除当前的keyiterator.remove();}} catch (Exception e) {log.error(监听端口轮询selector时发生异常,e);}}}
}协议接口
import java.io.IOException;
import java.nio.channels.SelectionKey;/*** 该接口定义了通用TCPSelectorServer类与特定协议之间的接口* 它把与具体协议相关的处理各种I/O的操作分离了出来* 以使不同协议都能方便地使用这个基本的服务模式。* author qf* since 2024/10/08 20:30*/
public interface Protocol {//accept I/O形式void handleAccept(SelectionKey selectionKey) throws IOException;//read I/O形式void handleRead(SelectionKey selectionKey) throws IOException;//write I/O形式void handleWrite(SelectionKey selectionKey) throws IOException;
}实现类
import lombok.extern.slf4j.Slf4j;import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.charset.StandardCharsets;/*** author qf* since 2024/10/08 20:30*/
Slf4j
public class EchoSelectorProtocol implements Protocol {private int bufSize; // 缓冲区的长度public EchoSelectorProtocol(int bufSize) {this.bufSize bufSize;}// 服务端信道已经准备好了接收新的客户端连接public void handleAccept(SelectionKey selectionKey) {try {SocketChannel socketChannel ((ServerSocketChannel) selectionKey.channel()).accept();socketChannel.configureBlocking(false);// 将选择器注册到连接到的客户端信道并指定该信道key值的属性为OP_READ同时为该信道指定关联的附件socketChannel.register(selectionKey.selector(), SelectionKey.OP_READ, ByteBuffer.allocate(bufSize));} catch (IOException e) {log.error(accept异常,e);selectionKey.cancel();}}// 客户端信道已经准备好了从信道中读取数据到缓冲区public void handleRead(SelectionKey selectionKey) {try {SocketChannel socketChannel (SocketChannel) selectionKey.channel();if (!(selectionKey.attachment() instanceof ByteBuffer)) {return;}// 获取该信道所关联的附件这里为缓冲区ByteBuffer byteBuffer (ByteBuffer) selectionKey.attachment();long bytesRead socketChannel.read(byteBuffer);// 如果read()方法返回-1说明客户端关闭了连接那么客户端已经接收到了与自己发送字节数相等的数据可以安全地关闭if (bytesRead -1) {socketChannel.close();} else if (bytesRead 0) {// 将channel改为读取状态byteBuffer.flip();String dateStr new String(byteBuffer.array());if (true) {// 注册写事件selectionKey.interestOps(SelectionKey.OP_WRITE);selectionKey.attach(test); // 将数据附加到SelectionKey上}byteBuffer.clear();// 如果缓冲区总读入了数据则将该信道感兴趣的操作设置为为可读可写selectionKey.interestOps(SelectionKey.OP_READ | SelectionKey.OP_WRITE);}} catch (IOException e) {log.error(read异常, e);selectionKey.cancel();} catch (Exception e) {log.error(read异常, e);}}// 客户端信道已经准备好了将数据从缓冲区写入信道public void handleWrite(SelectionKey selectionKey) throws IOException {SocketChannel socketChannel (SocketChannel) selectionKey.channel();if (selectionKey.attachment() instanceof String) {String data (String) selectionKey.attachment(); // 获取附加的数据ByteBuffer buffer ByteBuffer.wrap(data.getBytes(StandardCharsets.UTF_8));socketChannel.write(buffer);}// 写完后取消写事件重新注册读事件selectionKey.interestOps(SelectionKey.OP_READ);}
}客户端
import lombok.extern.slf4j.Slf4j;import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.nio.charset.StandardCharsets;/** * 模拟客户端* author qf* date 2024/7/8 19:25 */
Slf4j
public class NIOClient {public static void main(String[] args) throws Exception{//得到一个网络通道SocketChannel socketChannel SocketChannel.open();//设置非阻塞socketChannel.configureBlocking(false);//提供服务器端的ip 和 端口InetSocketAddress inetSocketAddress new InetSocketAddress(127.0.0.1, 9991);//连接服务器if (!socketChannel.connect(inetSocketAddress)) {while (!socketChannel.finishConnect()) {//!没有 完成连接finishConnect方法log.info(因为连接需要时间客户端不会阻塞可以做其它工作..);}}//...如果连接成功就发送数据String str hello;ByteBuffer buffer ByteBuffer.wrap(str.getBytes());//发送数据将 buffer 数据写入 channelsocketChannel.write(buffer);// 接收服务器发送的数据int count 0;while (true) {ByteBuffer readBuffer ByteBuffer.allocate(1024 * 1024);count socketChannel.read(readBuffer);if(count ! 0){System.out.println(count);String data StandardCharsets.UTF_8.decode(readBuffer).toString();System.out.println(data);String x new String(readBuffer.array());System.out.println(x);count 0;}readBuffer.clear();}}
} 相关文章 SpringBoot项目监听端口接受数据(Netty版)
