Compiling classes with log4j
============================
$ mvn compile -Puse-log4j
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Port Listener 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.3:resources (default-resources) @ portlistener ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ portlistener ---
[INFO] Nothing to compile - all classes are up to date
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.887s
[INFO] Finished at: Mon Apr 15 20:21:20 PDT 2013
[INFO] Final Memory: 7M/239M
[INFO] ------------------------------------------------------------------------
Packaging a stand-alone jar with all dependencies included
==========================================================
$ mvn package -Puse-log4j
[snip]
$ tree target
target
├── archive-tmp
├── classes
│ ├── com
│ │ └── swijaya
│ │ └── portlistener
│ │ ├── App$1.class
│ │ ├── App.class
│ │ ├── App$PortsConfig.class
│ │ └── DiscardServerHandler.class
│ └── log4j.xml
├── generated-sources
│ └── annotations
├── generated-test-sources
│ └── test-annotations
├── maven-archiver
│ └── pom.properties
├── maven-status
│ └── maven-compiler-plugin
│ ├── compile
│ │ └── default-compile
│ │ ├── createdFiles.lst
│ │ └── inputFiles.lst
│ └── testCompile
│ └── default-testCompile
│ ├── createdFiles.lst
│ └── inputFiles.lst
├── portlistener-1.0-SNAPSHOT.jar
├── portlistener-1.0-SNAPSHOT-jar-with-dependencies.jar
├── surefire
├── surefire-reports
│ ├── com.swijaya.portlistener.AppTest.txt
│ └── TEST-com.swijaya.portlistener.AppTest.xml
└── test-classes
└── com
└── swijaya
└── portlistener
└── AppTest.class
22 directories, 15 files
Opening listeners (both stream and datagram) on ports 8080, 5050 to 5055, and 9000
==================================================================================
$ java -jar target/portlistener-1.0-SNAPSHOT-jar-with-dependencies.jar --ports=8080,5050-5055,9000
On another session:
$ netstat -tulpn | grep java
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
[snip]
tcp6 0 0 :::5050 :::* LISTEN 13255/java
tcp6 0 0 :::5051 :::* LISTEN 13255/java
tcp6 0 0 :::5052 :::* LISTEN 13255/java
tcp6 0 0 :::5053 :::* LISTEN 13255/java
tcp6 0 0 :::5054 :::* LISTEN 13255/java
tcp6 0 0 :::5055 :::* LISTEN 13255/java
[snip]
tcp6 0 0 :::9000 :::* LISTEN 13255/java
[snip]
tcp6 0 0 :::8080 :::* LISTEN 13255/java
udp6 0 0 :::8080 :::* 13255/java
udp6 0 0 :::9000 :::* 13255/java
udp6 0 0 :::5050 :::* 13255/java
udp6 0 0 :::5051 :::* 13255/java
udp6 0 0 :::5052 :::* 13255/java
udp6 0 0 :::5053 :::* 13255/java
udp6 0 0 :::5054 :::* 13255/java
udp6 0 0 :::5055 :::* 13255/java
Verbose mode gives you (some) logging
=====================================
$ java -jar target/portlistener-1.0-SNAPSHOT-jar-with-dependencies.jar --verbose --ports=8080
DEBUG SelectorUtil - Using select timeout of 500
DEBUG SelectorUtil - Epoll-bug workaround enabled = false
DEBUG PortListener - [id: 0xa41a98ab] OPEN
DEBUG PortListener - [id: 0xa41a98ab] BIND: 0.0.0.0/0.0.0.0:8080
DEBUG PortListener - [id: 0xa41a98ab] BOUND: 0.0.0.0/0.0.0.0:8080
On another session:
$ nc -vv localhost 8080
Connection to localhost 8080 port [tcp/http-alt] succeeded!
Hello, world!
^C
Back to the original session:
DEBUG PortListener - [id: 0xb9de8ac1, /127.0.0.1:39208 => /127.0.0.1:8080] OPEN
DEBUG PortListener - [id: 0xb9de8ac1, /127.0.0.1:39208 => /127.0.0.1:8080] BOUND: /127.0.0.1:8080
DEBUG PortListener - [id: 0xb9de8ac1, /127.0.0.1:39208 => /127.0.0.1:8080] CONNECTED: /127.0.0.1:39208
DEBUG PortListener - [id: 0xb9de8ac1, /127.0.0.1:39208 => /127.0.0.1:8080] RECEIVED: BigEndianHeapChannelBuffer(ridx=0, widx=14, cap=14)
+-------------------------------------------------+
| 0 1 2 3 4 5 6 7 8 9 a b c d e f |
+--------+-------------------------------------------------+----------------+
|00000000| 48 65 6c 6c 6f 2c 20 77 6f 72 6c 64 21 0a |Hello, world!. |
+--------+-------------------------------------------------+----------------+
DEBUG PortListener - [id: 0xb9de8ac1, /127.0.0.1:39208 :> /127.0.0.1:8080] DISCONNECTED
DEBUG PortListener - [id: 0xb9de8ac1, /127.0.0.1:39208 :> /127.0.0.1:8080] UNBOUND
DEBUG PortListener - [id: 0xb9de8ac1, /127.0.0.1:39208 :> /127.0.0.1:8080] CLOSED
^CDEBUG PortListener - [id: 0xa41a98ab] CLOSE
DEBUG PortListener - [id: 0xa41a98ab] UNBOUND
DEBUG PortListener - [id: 0xa41a98ab] CLOSED
DEBUG App - Shutdown.
santa4nt/portlistener
A toy netty program to open ports and discard received messages (with some logging).
Java