几种语言的比较（WIP）

各种feature的实现

1. 执行shell
2. 处理时间
3. 处理参数
4. 处理文件
5. logging
6. test
7. 多线程、进程，并发 

语言

1. python
2. groovy
3. scala
4. java
5. C++
6. C
7. shell
8. go

执行shell, check output

1. groovy
   1. a= "ls".execute(); println a.text
2. scala
   1. import sys.process._; “ls”.!!
3. Java
4. python
   1. import subprocess; a = subprocess.check_output("ls /tmp", shell=True); print(a)
5. C++

处理时间

1. java/scaca 
2. python

处理参数

1. python
   1. argparse
2. scala
   1. scallop
   2. scopt　
   3. Argparse4j
3. java
   1. Argparse4J
   2. JewlCli　　　　

文件

1. scala:
   1. import java.io._ ; val writer = new PrintWriter(new File("test.txt)); writer.write("hello world"); writer.close)
   2. import scala.io.Surce; Source.fromFile("test.txt").foreach{println}

logging

1. python (RotateFile and Console)

   1. handler_Console = logging.StreamHandler()
      handler_Console.setFormatter(formatter)
      handler_Console.setLevel(logging.DEBUG)

      base_dir = os.path.dirname(os.path.abspath(__file__))
      log_path = os.path.join(base_dir, log_file_name)
      handler_F = RotatingFileHandler(log_path, maxBytes=200*1024, backupCount=5)
      handler_F.setFormatter(formatter)
      handler_F.setLevel(logging.INFO)

      logger = logging.getLogger(logger_name)
      logger.addHandler(handler_Console)
      logger.addHandler(handler_F)
      logger.setLevel(logging.DEBUG)

2. scala or java
   1. SLF4J, Log4j, Log4j2 (使用SLF4J and Logback,  log4j vs logback vs log4j2)
   2. import org.apache.log4j.Logger;
      import org.apache.log4j.PropertyConfigurator;

static Logger logger = Logger.getLogger(this.getClass)
      PropertyConfigurator.configure("log4j.properties");

   3. log4j.properites
      
      # Root logger
      log4j.rootLogger=INFO, console, file
      
      log4j.appender.console=org.apache.log4j.ConsoleAppender
      log4j.appender.console.Target=System.out
      log4j.appender.console.layout=org.apache.log4j.PatternLayout
      log4j.appender.consoleAppender.layout.ConversionPattern=[%t] %-5p %c %x - %m%n

      
      # Direct log messages to a log file
      log4j.appender.file=org.apache.log4j.RollingFileAppender
      
      log4j.appender.file.File=C:\tempinfo.log
      log4j.appender.file.MaxFileSize=10MB
      log4j.appender.file.MaxBackupIndex=10
      log4j.appender.file.layout=org.apache.log4j.PatternLayout
      log4j.appender.file.layout.ConversionPattern=[%t] %-5p %c %x - %m%n