大家如果对使用netty搞这些http请求什么的感兴趣的，可以参观我自己创建的这个项目。
nanshaws/nettyWeb: 复习一下netty，并打算做一个web项目出来 (github.com)
Redis的基本命令包括：
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SET key value：设置指定key的值。
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GET key：获取指定key的值。
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DEL key：删除指定key。
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EXISTS key：检查指定key是否存在。
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TTL key：获取指定key的过期时间。
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KEYS pattern：查找所有符合指定模式的key。
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INCR key：将指定key的值增加1。
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DECR key：将指定key的值减少1。
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LPUSH key value：将值添加到列表的左侧。
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RPUSH key value：将值添加到列表的右侧。
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LPOP key：移除并返回列表左侧的值。
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RPOP key：移除并返回列表右侧的值。
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SADD key member：将成员添加到集合中。
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SMEMBERS key：获取集合中的所有成员。
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ZADD key score member：将成员添加到有序集合中。
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ZRANGE key start stop：按照分数从小到大的顺序获取有序集合中指定范围的成员。
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HSET key field value：将哈希表中指定字段的值设置为指定值。
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HGET key field：获取哈希表中指定字段的值。
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HMGET key field1 [field2]：获取哈希表中指定字段的值列表。
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PING：测试Redis服务器是否可用。
用netty操作redis
引入依赖：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.tianfan</groupId><artifactId>nettyTestLearn</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><dependency><groupId>io.netty</groupId><artifactId>netty-transport-native-epoll</artifactId><version>4.1.70.Final</version></dependency><dependency><groupId>io.netty</groupId><artifactId>netty-all</artifactId><version>4.1.86.Final</version></dependency><dependency><groupId>jakarta.activation</groupId><artifactId>jakarta.activation-api</artifactId><version>2.1.2</version></dependency><dependency><groupId>org.eclipse.angus</groupId><artifactId>angus-mail</artifactId><version>1.0.0</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.33</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.10</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.30</version></dependency><!-- json--><dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.8.9</version></dependency></dependencies></project>完整代码：
package org.tianfan.example;import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.util.concurrent.GenericFutureListener;import java.io.BufferedReader;
import java.io.InputStreamReader;public class RedisClient {String host; // 目标主机int port; // 目标主机端口public RedisClient(String host,int port){this.host = host;this.port = port;}public void start() throws Exception{EventLoopGroup group = new NioEventLoopGroup();try {Bootstrap bootstrap = new Bootstrap();bootstrap.group(group).channel(NioSocketChannel.class).handler(new RedisClientInitializer());Channel channel = bootstrap.connect(host, port).sync().channel();System.out.println(" connected to host : " + host + ", port : " + port);System.out.println(" type redis's command to communicate with redis-server or type 'quit' to shutdown ");BufferedReader in = new BufferedReader(new InputStreamReader(System.in));ChannelFuture lastWriteFuture = null;for (;;) {String s = in.readLine();if(s.equalsIgnoreCase("quit")) {break;}System.out.print(">");lastWriteFuture = channel.writeAndFlush(s);lastWriteFuture.addListener(new GenericFutureListener<ChannelFuture>() {@Overridepublic void operationComplete(ChannelFuture future) throws Exception {if (!future.isSuccess()) {System.err.print("write failed: ");future.cause().printStackTrace(System.err);}}});}if (lastWriteFuture != null) {lastWriteFuture.sync();}System.out.println(" bye ");}finally {group.shutdownGracefully();}}public static void main(String[] args) throws Exception{RedisClient client = new RedisClient("192.168.56.10",6379);client.start();}}
package org.tianfan.example;import io.netty.buffer.ByteBufUtil;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.CodecException;
import io.netty.handler.codec.redis.*;
import io.netty.util.CharsetUtil;
import io.netty.util.ReferenceCountUtil;import java.util.ArrayList;
import java.util.List;public class RedisClientHandler extends ChannelDuplexHandler {// 发送 redis 命令@Overridepublic void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {String[] commands = ((String) msg).split("\\s+");List<RedisMessage> children = new ArrayList<>(commands.length);for (String cmdString : commands) {children.add(new FullBulkStringRedisMessage(ByteBufUtil.writeUtf8(ctx.alloc(), cmdString)));}RedisMessage request = new ArrayRedisMessage(children);ctx.write(request, promise);}// 接收 redis 响应数据@Overridepublic void channelRead(ChannelHandlerContext ctx, Object msg) {RedisMessage redisMessage = (RedisMessage) msg;// 打印响应消息printAggregatedRedisResponse(redisMessage);// 是否资源ReferenceCountUtil.release(redisMessage);}@Overridepublic void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {System.err.print("exceptionCaught: ");cause.printStackTrace(System.err);ctx.close();}private static void printAggregatedRedisResponse(RedisMessage msg) {if (msg instanceof SimpleStringRedisMessage) {System.out.println(((SimpleStringRedisMessage) msg).content());} else if (msg instanceof ErrorRedisMessage) {System.out.println(((ErrorRedisMessage) msg).content());} else if (msg instanceof IntegerRedisMessage) {System.out.println(((IntegerRedisMessage) msg).value());} else if (msg instanceof FullBulkStringRedisMessage) {System.out.println(getString((FullBulkStringRedisMessage) msg));} else if (msg instanceof ArrayRedisMessage) {for (RedisMessage child : ((ArrayRedisMessage) msg).children()) {printAggregatedRedisResponse(child);}} else {throw new CodecException("unknown message type: " + msg);}}private static String getString(FullBulkStringRedisMessage msg) {if (msg.isNull()) {return "(null)";}return msg.content().toString(CharsetUtil.UTF_8);}}
package org.tianfan.example;import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.redis.RedisArrayAggregator;
import io.netty.handler.codec.redis.RedisBulkStringAggregator;
import io.netty.handler.codec.redis.RedisDecoder;
import io.netty.handler.codec.redis.RedisEncoder;public class RedisClientInitializer extends ChannelInitializer<Channel> {@Overrideprotected void initChannel(Channel ch) throws Exception {ChannelPipeline pipeline = ch.pipeline();pipeline.addLast(new RedisDecoder());pipeline.addLast(new RedisBulkStringAggregator());pipeline.addLast(new RedisArrayAggregator());pipeline.addLast(new RedisEncoder());pipeline.addLast(new RedisClientHandler());}
}
结果图：
