java echo 服务器_编译和运行 Echo 服务器和客户端

落日映苍穹つ 2022-11-06 04:56 220阅读 0赞

编译和运行 Echo 服务器和客户端

\#\#\#编译

本例涉及到多模块 Maven 项目的组织

在例子 chapter2 目录下，执行

mvn clean package

输出如下

Listing 2.6 Build Output

chapter2>mvn clean package

\[INFO\] Scanning for projects...

\[INFO\] --------------------------------------------------------------------

\[INFO\] Reactor Build Order:

\[INFO\]

\[INFO\] Echo Client and Server

\[INFO\] Echo Client

\[INFO\] Echo Server

\[INFO\]

\[INFO\] --------------------------------------------------------------------

\[INFO\] Building Echo Client and Server 1.0-SNAPSHOT

\[INFO\] --------------------------------------------------------------------

\[INFO\]

\[INFO\] --- maven-clean-plugin:2.5:clean (default-clean) @ echo-parent ---

\[INFO\]

\[INFO\] --------------------------------------------------------------------

\[INFO\] Building Echo Client 1.0-SNAPSHOT

\[INFO\] --------------------------------------------------------------------

\[INFO\]

\[INFO\] --- maven-clean-plugin:2.5:clean (default-clean) @ echo-client ---

\[INFO\]

\[INFO\] --- maven-compiler-plugin:3.1:compile (default-compile)

@ echo-client ---

\[INFO\] Changes detected - recompiling the module!

\[INFO\] --------------------------------------------------------------------

\[INFO\] Reactor Summary:

\[INFO\]

\[INFO\] Echo Client and Server ......................... SUCCESS \[ 0.118 s\]

\[INFO\] Echo Client .................................... SUCCESS \[ 1.219 s\]

\[INFO\] Echo Server .................................... SUCCESS \[ 0.110 s\]

\[INFO\] --------------------------------------------------------------------

\[INFO\] BUILD SUCCESS

\[INFO\] --------------------------------------------------------------------

\[INFO\] Total time: 1.561 s

\[INFO\] Finished at: 2014-06-08T17:39:15-05:00

\[INFO\] Final Memory: 14M/245M

\[INFO\] --------------------------------------------------------------------

注意事项：

Maven Reactor 构建顺序：先是 父 POM，然后是子项目

Netty artifact 没在用户的本地存储库中找到，所以 Maven 就会从互联网上下载

clean 和 compile 在构建生命周期的运行。事后 mavensurefire-plugin 插件运行，但不会有测试类存在。最后 mavenjar-plugin 执行

这段说明了项目已经成功编译。

\#\#\#运行 Echo 服务器 和 客户端

我们使用 exec-maven-plugin 来运行项目。

在 chapter2/Server 目录，执行

mvn exec:java

输出如下：

\[INFO\] Scanning for projects...

\[INFO\]

\[INFO\] --------------------------------------------------------------------

\[INFO\] Building Echo Server 1.0-SNAPSHOT

\[INFO\] --------------------------------------------------------------------

\[INFO\]

\[INFO\] >>> exec-maven-plugin:1.2.1:java (default-cli) @ echo-server >>>

\[INFO\]

\[INFO\] <<< exec-maven-plugin:1.2.1:java (default-cli) @ echo-server <<<

\[INFO\]

\[INFO\] --- exec-maven-plugin:1.2.1:java (default-cli) @ echo-server ---

nettyinaction.echo.EchoServer started and listening for connections on

/0:0:0:0:0:0:0:0:9999

在 chapter2/Client 目录，执行

mvn exec:java

输出如下：

\[INFO\] Scanning for projects...

\[INFO\]

\[INFO\] --------------------------------------------------------------------

\[INFO\] Building Echo Client 1.0-SNAPSHOT

\[INFO\] --------------------------------------------------------------------

\[INFO\]

\[INFO\] >>> exec-maven-plugin:1.2.1:java (default-cli) @ echo-client >>>

\[INFO\]

\[INFO\] <<< exec-maven-plugin:1.2.1:java (default-cli) @ echo-client <<<

\[INFO\]

\[INFO\] --- exec-maven-plugin:1.2.1:java (default-cli) @ echo-client ---

Client received: Netty rocks!

\[INFO\] --------------------------------------------------------------------

\[INFO\] BUILD SUCCESS

\[INFO\] --------------------------------------------------------------------

\[INFO\] Total time: 3.907 s

\[INFO\] Finished at: 2014-06-08T18:26:14-05:00

\[INFO\] Final Memory: 8M/245M

\[INFO\] --------------------------------------------------------------------

在服务器的控制台输出：

Server received: Netty rocks!

发生了什么事：

客户端连接后，它发送消息：“Netty rocks！”

服务器输出接收到消息并将其返回给客户端

客户输出接收到的消息并退出。

每次运行客户端，你会看到在服务器的控制台输出：

Server received: Netty rocks!

现在，我们看下错误的情况。在控制台 输入 Ctrl-C 来关闭服务器。而后运行客户端，此时输出如下：

\[INFO\] Scanning for projects...

\[INFO\]

\[INFO\] --------------------------------------------------------------------

\[INFO\] Building Echo Client 1.0-SNAPSHOT

\[INFO\] --------------------------------------------------------------------

\[INFO\]

\[INFO\] >>> exec-maven-plugin:1.2.1:java (default-cli) @ echo-client >>>

\[INFO\]

\[INFO\] <<< exec-maven-plugin:1.2.1:java (default-cli) @ echo-client <<<

\[INFO\]

\[INFO\] --- exec-maven-plugin:1.2.1:java (default-cli) @ echo-client ---

\[WARNING\]

java.lang.reflect.InvocationTargetException

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke

(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke

(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:297)

at java.lang.Thread.run(Thread.java:744)

Caused by: java.net.ConnectException: Connection refused:

no further information: localhost/127.0.0.1:9999

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect

(SocketChannelImpl.java:739)

at io.netty.channel.socket.nio.NioSocketChannel

.doFinishConnect(NioSocketChannel.java:191)

at io.netty.channel.nio.

AbstractNioChannel$AbstractNioUnsafe.finishConnect(

AbstractNioChannel.java:279)

at io.netty.channel.nio.NioEventLoop

.processSelectedKey(NioEventLoop.java:511)

at io.netty.channel.nio.NioEventLoop

.processSelectedKeysOptimized(NioEventLoop.java:461)

at io.netty.channel.nio.NioEventLoop

.processSelectedKeys(NioEventLoop.java:378)

at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:350)

at io.netty.util.concurrent

.SingleThreadEventExecutor$2.run

(SingleThreadEventExecutor.java:101)

... 1 more

\[INFO\] --------------------------------------------------------------------

\[INFO\] BUILD FAILURE

\[INFO\] --------------------------------------------------------------------

\[INFO\] Total time: 3.728 s

\[INFO\] Finished at: 2014-06-08T18:49:13-05:00

\[INFO\] Final Memory: 8M/245M

\[INFO\] --------------------------------------------------------------------

\[ERROR\] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java

(default-cli) on project echo-client: An exception occured while executing the

Java class. null: InvocationTargetException: Connection refused: no further

information:

localhost/127.0.0.1:9999 -> \[Help 1\]

发生了啥？客户端尝试连接服务器，但服务器是关闭的，所以引发了一个 java.net.ConnectException ，这个异常被 EchoClientHandler 的 exceptionCaught() 触发，打印出异常信息，并关闭 channel

java echo 服务器_编译和运行 Echo 服务器和客户端

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