这篇文章主要介绍了Ruby常用文件操作方法,本文讲解了新建文件、读取文件、删除、重命名文件、目录操作等常用文件操作方法,需要的朋友可以参考下
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
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