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Redisson入门

文章目录

  • 一、Redisson是什么?
  • 二、使用步骤
    • 1.引入库
    • 2.Redisson 配置
    • 2.增(改)
    • 3.删
    • 4.查
    • 5.测试类
  • 三、遇到错误
  • 总结
  • 参考资料


一、Redisson是什么?

Redisson——具有内存数据网格功能的Redis Java 客户端
基于高性能异步无锁Java Redis客户端和Netty框架。
JDK 兼容性:1.8 - 16,Android

二、使用步骤

1.引入库

  • maven
<dependency>
   <groupId>org.redisson</groupId>
   <artifactId>redisson</artifactId>
   <version>3.16.0</version>
</dependency>  

2.Redisson 配置

        Config config = new Config();
        //设置编解码器(默认FST)
        config.setCodec(new JsonJacksonCodec());
        //模式设置(单例)
        config.useSingleServer()
        .setAddress("redis://You redis IP: Port")
        .setPassword("password")
        .setDatabase(Database);
        RedissonClient redisson = Redisson.create(config);
  • 编/解码器详情(数据序列化)

2.增(改)

  • Redis命令和Redisson对象匹配列表
  • Redis命令
public static void addData(RedissonClient redissonClient, DataType Type){
        switch (Type){
            case String:
                RBucket<String> rBucket = redissonClient.getBucket("fud:test:meng:String");
                rBucket.set("MengTest");
                break;

            case Hash:
                RMap<String, Object> rMap = redissonClient.getMap("fud:test:meng:map");
                HashMap<String,String> DataMap   = new HashMap<>();
                DataMap.put("Test1","1");
                DataMap.put("Test2","2");
                DataMap.put("Test3","3");
                DataMap.put("Test4","4");
                rMap.putAll(DataMap);
                break;
            case List:
                RList<String> rList = redissonClient.getList("fud:test:meng:list");
               List<String> List = new ArrayList();
                List.add("Test1");
                List.add("Test2");
                List.add("Test3");
                List.add("Test4");
                List.add("Test5");
                rList.addAll(List);
                break;
            case Set:
                RSet<String> rSet = redissonClient.getSet("fud:test:meng:set");
                HashSet<String> set = new HashSet<>();
                set.add("Test1");
                set.add("Test2");
                set.add("Test3");
                set.add("Test4");
                set.add("Test5");
                rSet.addAll(set);
                break;
            default:
                break;
        }

    }

Redis对应命令

SET fud:test:meng:String "MengTest"

HMSET fud:test:meng:map Test1"1" Test12 "Test2"

RPUSH fud:test:meng:list "Test1"
RPUSH fud:test:meng:list "Test2"

SADD fud:test:meng:set "Test1"
SADD fud:test:meng:set "Test2"

3.删

 public static void DeleteData(RedissonClient redissonClient, String key, DataType Type){
        switch (Type){
            case String:
                redissonClient.getBucket(key).delete();
                break;

            case Hash:
               redissonClient.getKeys().delete(key);
                break;
            case Set:
                redissonClient.getKeys().delete(key);
                break;
            case List:
                redissonClient.getKeys().delete(key);
            default:
                break;
        }
    }

4.查

   public static void SelectData(RedissonClient redissonClient, String key, DataType Type){
        switch (Type){
            case String:
                RBucket<String> rBucket = redissonClient.getBucket(key);
                System.out.println(rBucket.get());
                break;
            case Hash:
                RMap<String, Object> rMap = redissonClient.getMap(key);
                Map<String, Object> Map = rMap.readAllMap();
                Map.forEach((s,o)->{
                    System.out.println(s+"    "+o);
                });
                break;
            case List:
                RList<String> rList = redissonClient.getList(key);
                List<String> list = rList.readAll();
                list.forEach(System.out::println);
                break;
            case Set:
                RSet<String> rSet = redissonClient.getSet(key);
                Set<String> set = rSet.readAll();
                set.forEach((s)->{
                    System.out.println("s = " + s);
                });
                break;
            default:
                break;
        }
    }

5.测试类

   public enum DataType {
        String,
        Hash,
        List,
        Set,
    }

 public static void main(String[] args){
        Config config = new Config();
        config.setCodec(new JsonJacksonCodec());
        config.useSingleServer()// use "rediss://" for SSL connection
        .setAddress("redis://10.8.1.211:6379")
        .setPassword("211")
        .setDatabase(15);
        RedissonClient redissonClient = Redisson.create(config);
          System.out.println("===============写数据开始=================");
        addData(redissonClient,DataType.String);
        addData(redissonClient,DataType.Hash);
        addData(redissonClient,DataType.List);
        addData(redissonClient,DataType.Set);
        System.out.println("===============写数据结束=================="+"\n");
        //读
        System.out.println("===============读数据开始=================");
        SelectData(redissonClient,"fud:test:meng:String",DataType.String);
        SelectData(redissonClient,"fud:test:meng:map",DataType.Hash);
        SelectData(redissonClient,"fud:test:meng:list",DataType.List);
        SelectData(redissonClient,"fud:test:meng:set",DataType.Set);
        System.out.println("===============读数据结束=================="+"\n");

        //删
        System.out.println("===============删数据开始=================");
        DeleteData(redissonClient,"fud:test:meng:String",DataType.String);
        DeleteData(redissonClient,"fud:test:meng:map",DataType.Hash);
        DeleteData(redissonClient,"fud:test:meng:list",DataType.List);
        DeleteData(redissonClient,"fud:test:meng:set",DataType.Set);
        System.out.println("===============删数据结束=================="+"\n");
          redissonClient.shutdown();
          System.out.println("是否关闭"+redissonClient.isShutdown());
    }

三、遇到错误

完整报错信息

16:55:31.272 [redisson-netty-2-6] ERROR org.redisson.client.handler.CommandDecoder - Unable to decode data. channel: [id: 0x57c050b5, L:/10.8.7.3:63833 - R:/10.8.1.211:6379], reply: ReplayingDecoderByteBuf(ridx=17, widx=17), command: (GET), params: [fud:test:meng:String]
java.io.IOException: java.lang.NullPointerException
	at org.nustaq.serialization.FSTObjectInput.readObject(FSTObjectInput.java:247)
	at org.redisson.codec.FstCodec$1.decode(FstCodec.java:250)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:368)
	at org.redisson.client.handler.CommandDecoder.decodeCommand(CommandDecoder.java:196)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:134)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:104)
	at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
	at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException: null
	at org.nustaq.serialization.FSTObjectInput.readObjectWithHeader(FSTObjectInput.java:357)
	at org.nustaq.serialization.FSTObjectInput.readObjectInternal(FSTObjectInput.java:331)
	at org.nustaq.serialization.FSTObjectInput.readObject(FSTObjectInput.java:311)
	at org.nustaq.serialization.FSTObjectInput.readObject(FSTObjectInput.java:245)
	... 24 common frames omitted
16:55:31.273 [redisson-netty-2-6] DEBUG org.redisson.command.RedisExecutor - connection released for command (GET) and params [fud:test:meng:String] from slot NodeSource [slot=0, addr=null, redisClient=null, redirect=null, entry=MasterSlaveEntry [masterEntry=[freeSubscribeConnectionsAmount=1, freeSubscribeConnectionsCounter=value:50:queue:0, freeConnectionsAmount=24, freeConnectionsCounter=value:64:queue:0, freezed=false, freezeReason=null, client=[addr=redis://10.8.1.211:6379], nodeType=MASTER, firstFail=0]]] using connection RedisConnection@971981736 [redisClient=[addr=redis://10.8.1.211:6379], channel=[id: 0x57c050b5, L:/10.8.7.3:63833 - R:/10.8.1.211:6379], currentCommand=CommandData [promise=RedissonPromise [promise=ImmediateEventExecutor$ImmediatePromise@496257e3(failure: java.io.IOException: java.lang.NullPointerException)], command=(GET), params=[fud:test:meng:String], codec=org.redisson.codec.FstCodec]]
16:55:31.274 [redisson-netty-2-6] WARN io.netty.channel.DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
io.netty.handler.codec.DecoderException: java.io.IOException: java.lang.NullPointerException
	at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:421)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: java.lang.NullPointerException
	at org.nustaq.serialization.FSTObjectInput.readObject(FSTObjectInput.java:247)
	at org.redisson.codec.FstCodec$1.decode(FstCodec.java:250)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:368)
	at org.redisson.client.handler.CommandDecoder.decodeCommand(CommandDecoder.java:196)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:134)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:104)
	at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
	at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366)
	... 17 common frames omitted
Caused by: java.lang.NullPointerException: null
	at org.nustaq.serialization.FSTObjectInput.readObjectWithHeader(FSTObjectInput.java:357)
	at org.nustaq.serialization.FSTObjectInput.readObjectInternal(FSTObjectInput.java:331)
	at org.nustaq.serialization.FSTObjectInput.readObject(FSTObjectInput.java:311)
	at org.nustaq.serialization.FSTObjectInput.readObject(FSTObjectInput.java:245)
	... 24 common frames omitted
Exception in thread "main" org.redisson.client.RedisException: Unexpected exception while processing command
	at org.redisson.command.CommandAsyncService.convertException(CommandAsyncService.java:350)
	at org.redisson.command.CommandAsyncService.get(CommandAsyncService.java:147)
	at org.redisson.RedissonObject.get(RedissonObject.java:90)
	at org.redisson.RedissonBucket.get(RedissonBucket.java:104)
	at com.example.demo.Test.SelectData(Test.java:102)
	at com.example.demo.Test.main(Test.java:37)
Caused by: java.io.IOException: java.lang.NullPointerException
	at org.nustaq.serialization.FSTObjectInput.readObject(FSTObjectInput.java:247)
	at org.redisson.codec.FstCodec$1.decode(FstCodec.java:250)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:368)
	at org.redisson.client.handler.CommandDecoder.decodeCommand(CommandDecoder.java:196)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:134)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:104)
	at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
	at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at org.nustaq.serialization.FSTObjectInput.readObjectWithHeader(FSTObjectInput.java:357)
	at org.nustaq.serialization.FSTObjectInput.readObjectInternal(FSTObjectInput.java:331)
	at org.nustaq.serialization.FSTObjectInput.readObject(FSTObjectInput.java:311)
	at org.nustaq.serialization.FSTObjectInput.readObject(FSTObjectInput.java:245)
	... 24 more

重要报错信息

16:55:31.272 [redisson-netty-2-6] ERROR org.redisson.client.handler.CommandDecoder - Unable to decode data. channel: [id: 0x57c050b5, L:/10.8.7.3:63833 - R:/10.8.1.211:6379], reply: ReplayingDecoderByteBuf(ridx=17, widx=17), command: (GET), params: [fud:test:meng:String]

可得知是数据序列化和反序列化的过程出现的问题,可能是 编/解码器 未设置或设置的不同(请看 2.Redisson 配置)


总结

这是Redisson入门学习记录,只是简单的进行了增删改查。更多内容请参考Redisson官网。

参考资料

  • redisson
  • Redisson 使用手册
  • Redis命令

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