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Demo netty

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This commit is contained in:
MartyJ28 2024-10-27 19:22:40 +08:00
parent 3835e68e21
commit 100656c611
5 changed files with 55 additions and 58 deletions
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43
src/main/java/com/example/demo/Service/HexToCharArray.java
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@ -4,54 +4,31 @@ import java.nio.ByteBuffer;
public class HexToCharArray {
public static void main(String[] args) {
// // 示例16进制字符串的ByteBuffer
// ByteBuffer buffer = ByteBuffer.wrap(new byte[]{0x4A, 0x6B, 0x4C, 0x6D});
//
// // 将 ByteBuffer 转换为字符数组
// char[] charArray = byteBufferToCharArray(buffer);
//
// // 打印字符数组
// System.out.println(charArray);
String hexString = "4A6B4C6D";
// 将16进制字符串转换为字符数组
char[] charArray = hexStringToCharArray(hexString);
// 打印字符数组
System.out.println(charArray);
}
public static char[] byteBufferToCharArray(ByteBuffer buffer) {
// 确保读取时从开头开始
/***示例16进制数组转字符数组****/
ByteBuffer buffer = ByteBuffer.wrap(new byte[]{0x4A, 0x6B, 0x4C, 0x6D});
buffer.rewind();
// 创建字符数组，每个字节转换为一个字符
char[] charArray = new char[buffer.remaining()];
for (int i = 0; i < charArray.length; i++) {
// 逐字节读取并转换为字符
charArray[i] = (char) buffer.get();
}
// 打印字符数组
System.out.println(charArray);
return charArray;
}
public static char[] hexStringToCharArray(String hexString) {
// 每两个十六进制字符表示一个字节，所以字符数组的长度为十六进制字符串长度的一半
/***示例16进制字符串转字符数组***/
String hexString = "4A6B4C6D";
int length = hexString.length() / 2;
char[] charArray = new char[length];
char[] charArray2 = new char[length];
for (int i = 0; i < length; i++) {
// 取出两个十六进制字符并解析为一个字节
String hexPair = hexString.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(hexPair, 16);
// 转换为字符并存入数组
charArray[i] = (char) byteValue;
charArray2[i] = (char) byteValue;
}
return charArray;
// 打印字符数组
System.out.println(charArray2);
}
}

16
src/main/java/com/example/demo/Service/nettyClient.java
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@ -1,10 +1,7 @@
package com.example.demo.Service;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
@ -13,7 +10,7 @@ import org.springframework.stereotype.Component;
@Component
public class nettyClient {
private final String host = "localhost"; // 目标服务器地址
private final String host = "127.0.0.1"; // 目标服务器地址
private final int port = 8081; // 目标服务器端口
public void start() throws InterruptedException {
@ -25,7 +22,7 @@ public class nettyClient {
Bootstrap bootstrap = new Bootstrap();
bootstrap.group(group) // 指定线程组
.channel(NioSocketChannel.class) // 指定使用 NIO 传输的Channel
.option(ChannelOption.SO_KEEPALIVE, true) // 保持长连接
//.option(ChannelOption.SO_KEEPALIVE, true) // 保持长连接
.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) {
@ -35,13 +32,14 @@ public class nettyClient {
});
// 4. 连接服务器
Channel channel = bootstrap.connect(host, port).sync().channel();
ChannelFuture future = bootstrap.connect(host, port).sync();
// 5. 向服务器发送消息
channel.writeAndFlush("Hello, Netty Server!");
//future.channel().writeAndFlush("Hello, Netty Server!");
// 6. 等待连接关闭
channel.closeFuture().sync();
future.channel().closeFuture().sync();
System.out.println("aaa");
} finally {
// 7. 关闭线程组
group.shutdownGracefully();

20
src/main/java/com/example/demo/Service/nettyClientHandler.java
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@ -3,15 +3,31 @@ package com.example.demo.Service;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.buffer.UnpooledByteBufAllocator;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;
import java.nio.charset.StandardCharsets;
public class nettyClientHandler extends ChannelInboundHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
// 处理服务器的响应
System.out.println("Received message from server: " + msg);
ByteBuf byteBuf = (ByteBuf)msg;
System.out.println("Received message from server: " + byteBuf.toString(StandardCharsets.UTF_8));
}
@Override
//当 Channel 已经连接/绑定并且已经就绪时调用
public void channelActive(ChannelHandlerContext ctx) throws Exception {
Object a = Unpooled.copiedBuffer("Hello from Netty Server",CharsetUtil.UTF_8);
ctx.channel().writeAndFlush(a);
System.out.println("send message to server: " + "Hello, Netty Server!");
}
@Override

19
src/main/java/com/example/demo/Service/nettyServer.java
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@ -2,16 +2,15 @@ package com.example.demo.Service;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import lombok.extern.slf4j.Slf4j;
@Slf4j
public class nettyServer {
private final int port;
@ -20,8 +19,8 @@ public class nettyServer {
}
public void start() throws InterruptedException {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
EventLoopGroup bossGroup = new NioEventLoopGroup(1);//线程
EventLoopGroup workerGroup = new NioEventLoopGroup();//8
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
@ -30,15 +29,15 @@ public class nettyServer {
@Override
public void initChannel(SocketChannel ch) {
ChannelPipeline p = ch.pipeline();
p.addLast(new StringDecoder());
p.addLast(new StringEncoder());
p.addLast(new nettyServerHandler());
}
});
ChannelFuture f = b.bind(port).sync();
System.out.println("Netty server started on port " + port);
ChannelFuture f = b.bind(port).sync();//成功之后在执行
f.addListener((ChannelFutureListener)future -> log.info("监听端口：{}",future.isSuccess()));
f.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();

11
src/main/java/com/example/demo/Service/nettyServerHandler.java
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@ -1,13 +1,20 @@
package com.example.demo.Service;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.buffer.UnpooledByteBufAllocator;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;
import java.nio.charset.StandardCharsets;
public class nettyServerHandler extends ChannelInboundHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
System.out.println("Received message: " + msg);
ctx.writeAndFlush("Hello from Netty Server!\n");
ByteBuf byteBuf = (ByteBuf)msg;
System.out.println("Received message: " + byteBuf.toString(CharsetUtil.UTF_8));
ctx.channel().writeAndFlush(Unpooled.copiedBuffer("Hello from Netty Server",CharsetUtil.UTF_8));
}
@Override