Ruby常用文件操作方法-Ruby

一、新建文件

复制代码代码如下:

	
	    f=File.new(File.join("C:","Test.txt"), "w+")

	    f.puts("I am Jack")

	    f.puts("Hello World")

文件模式
"r" ：Read-only. Starts at beginning of file (default mode).
"r+" ：Read-write. Starts at beginning of file.
"w" ：Write-only. Truncates existing file to zero length or creates a new file for writing.
"w+" ：Read-write. Truncates existing file to zero length or creates a new file for reading and writing.
"a" ：Write-only. Starts at end of file if file exists; otherwise, creates a new file for writing.
"a+" ：Read-write. Starts at end of file if file exists; otherwise, creates a new file for reading and writing.
"b" ：(DOS/Windows only.) Binary file mode. May appear with any of the key letters listed above

二、读取文件

复制代码代码如下:

	
	    file=File.open(File.join("C:","Test.txt"),"r")

	    file.each { |line| print "#{file.lineno}.", line }

	    file.close

三、新建、删除、重命名文件

复制代码代码如下:

	
	    File.new( "books.txt", "w" )

	    File.rename( "books.txt", "chaps.txt" )

	    File.delete( "chaps.txt" )

四、目录操作
1 创建目录

复制代码代码如下:

	
	    Dir.mkdir("c:/testdir")

	     #删除目录

	     Dir.rmdir("c:/testdir")

	     #查询目录里的文件

	     p Dir.entries(File.join("C:","Ruby")).join(' ')

	     #遍历目录

	     Dir.entries(File.join("C:","Ruby")).each {

	          |e| puts e

	    }

1、ARGV and ARGF

复制代码代码如下:

ARGV
    ARGV << "cnblogslink.txt"
    #The gets method is a Kernel method that gets lines from ARGV
    print while gets
    p ARGV.class

ARGF
    while line = ARGF.gets
     print line
    end

2、文件信息查询

复制代码代码如下:

	
	    #文件是否存在

	    p File::exists?( "cnblogslink.txt" ) # => true

	    #是否是文件

	    p File.file?( "cnblogslink.txt" ) # => true

	    #是否是目录

	    p File::directory?( "c:/ruby" ) # => true

	    p File::directory?( "cnblogslink.txt" ) # => false

	    #文件权限

	    p File.readable?( "cnblogslink.txt" ) # => true

	    p File.writable?( "cnblogslink.txt" ) # => true

	    p File.executable?( "cnblogslink.txt" ) # => false

	    #是否是零长度

	    p File.zero?( "cnblogslink.txt" ) # => false

	    #文件大小 bytes

	    p File.size?( "cnblogslink.txt" ) # => 74

	    p File.size( "cnblogslink.txt" ) # => 74

	    #文件或文件夹

	    p File::ftype( "cnblogslink.txt" ) # => "file"

	    #文件创建、修改、最后一次存取时间

	    p File::ctime( "cnblogslink.txt" ) # => Sat Sep 19 08:05:07 +0800 2009

	    p File::mtime( "cnblogslink.txt" ) # => Sat Sep 19 08:06:34 +0800 2009

	    p File::atime( "cnblogslink.txt" ) # => Sat Sep 19 08:05:07 +0800 2009

3、查找文件

复制代码代码如下:

	
	    puts "查找目录下所有文件及文件夹"

	    Dir["c:/ruby/*"].each {|x|

	          puts x

	    }

	    puts "条件查询"

	    Dir.foreach('c:/ruby') {

	        |x| puts x if x != "." && x != ".."

	    }

	    puts "查找某一类型文件"

	    Dir["*.rb"].each {|x|

	      puts x

	     }

	    puts "Open 查询"

	    Dir.open('c:/ruby') { |d| d.grep /l/ }.each{|x| puts x}

	    puts "---------------------------"     

	    puts "正则表达式查询"

	    Dir["c:/ruby/ruby/[rs]*"].each{|x| puts x}

	    puts "------------------------"

	    Dir["c:/ruby/[^s]*"].each{|x| puts x}

	    puts "------------------------"   

	    Dir["c:/ruby/{ruby,li}*"].each{|x| puts x}

	    puts "------------------------"   

	    Dir["c:/ruby/?b*"].each{|x| puts x}       

	    puts "查找目录及子目录的文件"

	    require 'find'    

	    Find.find('./') { |path| puts path }

复制代码代码如下:

	
	    require "find"

	Find.find("/etc/passwd", "/var/spool/lp1", ".") do |f|

	  Find.prune if f == "."

	  puts f

	end

原型：ref.find( [ aName ]* ) {| aFileName | block }
prune：Skips the current file or directory, restarting the loop with the next entry. If the current file is a directory, that directory will not be recursively entered. Meaningful only within the block associated with Find::find.

4、文件比较复制等

复制代码代码如下:

	
	    require 'ftools'

	    File.copy 'testfile', 'testfile1'  » true

	    File.compare 'testfile', 'testfile1'  » true

Ruby常用文件操作方法

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