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 existsotherwise, creates a new file for writing.
"a+" :Read-write. Starts at end of file if file existsotherwise, 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
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
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
Dir.mkdir("c:/testdir")
04 #删除目录
05 Dir.rmdir("c:/testdir")
07 #查询目录里的文件
08 p Dir.entries(File.join("C:","Ruby")).join(' ')
10 #遍历目录
11 Dir.entries(File.join("C:","Ruby")).each {
|e| puts e
}
1、ARGV and ARGF
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
#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
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 }
3、查询目录及子目录文件
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
require 'ftools'
File.copy 'testfile', 'testfile1' » true
File.compare 'testfile', 'testfile1' » true
你设置下cmd的属性——快捷方式——起始位置(默认的起始位置是c:\Documents and Settings\user)将这一个值设置为你java代码存放的文件夹位置,就可以运行了 比如把java程序放在F盘的java文件夹中,就把起始位置改为:F:\java 就可以了 试试吧 进行这个操作前最好在桌面上新建命令提示符(cmd),这样才能进行以上操作,还有你修改了桌面上的属性之后,你在运行中输入cmd,你会发现那里的起始位置还是:\Documents and Settings\user,但是在桌面上的就不同,是你设置的那个起始位置值。ruby读音:英 [ˈruːbi] 美 [ˈruːbi]
释义:
n. 红宝石;红宝石色
adj. 红宝石色的
vt. 使带红宝石色
n. (Ruby)人名;(法)吕比;(英、西、德、匈、瑞典)鲁比
短语:
Ruby Slippers 红宝石鞋
Ancona ruby 安科纳红宝石 ; [宝] 红水晶 ; 安科纳红珠宝
alabandine ruby 贵榴石红宝石 ; 贵榴石红珠宝
扩展资料
近义词:red
英 [red] 美 [red]
adj. 红色的
n. 红色
red的基本意思是“红色的”,也可指“褐红色的,深红的,深紫色的”等颜色,引申可表示眼睛“布满血丝的,眼眶发红的,充血的”或脸因羞惭、愤怒等而“涨红的”。
red用作名词的基本意思是“红色”,可用作可数名词,也可用作不可数名词; 既有复数形式reds,也可说much red。
red也可作“红衣服”解,是不可数名词,往往不带冠词。