详尽Netty(二):源码环境搭建

今天药忘吃喽~ 2023-02-21 14:14 34阅读 0赞

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![架构殿堂][20200415234301759.jpg]

## 1.依赖工具 ##

Maven  
Git  
JDK  
IntelliJ IDEA  
SourceTree

## 2.源码拉取 ##

netty源码git地址:https://github.com/netty/netty

选择的是4.1分支，如图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnhpbnhpbjEzMTQ_size_16_color_FFFFFF_t_70]

最好是Fork到自己的仓库里，这样可以自己做点笔记，写一些注释，并且提交。

然后用sourcetree来clone  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnhpbnhpbjEzMTQ_size_16_color_FFFFFF_t_70 1]

## 3. maven 配置 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnhpbnhpbjEzMTQ_size_16_color_FFFFFF_t_70 2]

如果不选jdk8，则会报错：

java.lang.NoSuchMethodError:
    java.nio.ByteBuffer.clear()Ljava/nio/ByteBuffer

## 4.引用错误 ##

import io.netty.util.collection.LongObjectHashMap;
    import io.netty.util.collection.LongObjectMap;

如果是这个引用有问题，则必须common包要重新编译一下，原因可以参见：

https://github.com/netty/netty/issues/7518

或者

https://github.com/netty/netty/issues/5447

## 5. 运行 example ##

netty源码中，有很多example例子程序，在example目录下。

## 6. EchoServer ##

执行 io.netty.example.echo.EchoServer 的 \#main(args) 方法，启动服务端。目录如图：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnhpbnhpbjEzMTQ_size_16_color_FFFFFF_t_70 3]

输出日志如下：

00:20:17.078 [nioEventLoopGroup-2-1] INFO  i.n.handler.logging.LoggingHandler - [id: 0xbfd8f792] REGISTERED
    00:20:17.092 [nioEventLoopGroup-2-1] INFO  i.n.handler.logging.LoggingHandler - [id: 0xbfd8f792] BIND: 0.0.0.0/0.0.0.0:8007
    00:20:17.100 [nioEventLoopGroup-2-1] INFO  i.n.handler.logging.LoggingHandler - [id: 0xbfd8f792, L:/0:0:0:0:0:0:0:0:8007] ACTIVE

## 7.EchoClient ##

执行 io.netty.example.echo.EchoClientr 的 #main(args) 方法，启动客户端，目录如图：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnhpbnhpbjEzMTQ_size_16_color_FFFFFF_t_70 4]

不输出任何日志。

EchoServer输出：

00:23:35.880 [nioEventLoopGroup-2-1] INFO  i.n.handler.logging.LoggingHandler - [id: 0xbfd8f792, L:/0:0:0:0:0:0:0:0:8007] READ: [id: 0xee5c60d5, L:/127.0.0.1:8007 - R:/127.0.0.1:49598]
    00:23:35.885 [nioEventLoopGroup-2-1] INFO  i.n.handler.logging.LoggingHandler - [id: 0xbfd8f792, L:/0:0:0:0:0:0:0:0:8007] READ COMPLETE

至此，Netty的源码环境就已经搭建完毕。

![架构殿堂][20200415234301759.jpg]

[20200415234301759.jpg]: https://img-blog.csdnimg.cn/20200415234301759.jpg
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnhpbnhpbjEzMTQ_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200701090126926.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnhpbnhpbjEzMTQ=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnhpbnhpbjEzMTQ_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20200701090140313.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnhpbnhpbjEzMTQ=,size_16,color_FFFFFF,t_70