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：
-
SET key value：设置指定key的值。
-
GET key：获取指定key的值。
-
DEL key：删除指定key。
-
EXISTS key：检查指定key是否存在。
-
TTL key：获取指定key的过期时间。
-
KEYS pattern：查找所有符合指定模式的key。
-
INCR key：将指定key的值增加1。
-
DECR key：将指定key的值减少1。
-
LPUSH key value：将值添加到列表的左侧。
-
RPUSH key value：将值添加到列表的右侧。
-
LPOP key：移除并返回列表左侧的值。
-
RPOP key：移除并返回列表右侧的值。
-
SADD key member：将成员添加到集合中。
-
SMEMBERS key：获取集合中的所有成员。
-
ZADD key score member：将成员添加到有序集合中。
-
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。
-
HSET key field value：将哈希表中指定字段的值设置为指定值。
-
HGET key field：获取哈希表中指定字段的值。
-
HMGET key field1 [field2]：获取哈希表中指定字段的值列表。
-
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>() {
@Override
public 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
@Override
public 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
@Override
public 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);
}
@Override
public 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> {
@Override
protected 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：