Ruby常用文件操作代码实例-Ruby

				?

									#建立一个222.rb文件并且输入字符

									file = File.open("222.rb","w+")

									file.puts "123\nwadwa\n12124124\ndwdw"

									file.close

									#输出222.rb的内容

									File.open("222.rb","r+") do |file|

									while line = file.gets

									puts line

									end

									end

									#直接用IO操作文件

									IO.foreach("222.rb") do |line|

									puts line if line =~/abc/ #输出匹配到了'abc'的所在行

									puts line if line !~/qwe/ #输出没有匹配到'qwe'的所在行

									end

									#输出文件的绝对路径

									puts File.expand_path("222.rb")

									#count chars from a file

									file= File.new("222.rb")

									w_count = 0

									file.each_byte do |byte|

									w_count += 1 if byte ==?1

									end

									puts "#{w_count}"

									#create new file and write some words there

									print "The file now is exist? --> "

									puts File.exist?("asd.txt")#判断文件是否存在

									file= File.new("asd.txt","w")

									print "The file now is exist? --> "

									puts File.exist?("asd.txt")

									file.write("hehe\nhahah")

									#io.stream operation

									require 'stringio'

									ios = StringIO.new("abcdef\n ABC \n 12345")

									ios.seek(5) #把偏移指针移到5（e字母所在位置）

									ios.puts("xyz3") #从5开始覆写原有数据

									puts ios.tell #tell--Returns the current offset (in bytes) of ios. 

									puts ios.string

									puts ios.string.dump #忽略\n的转义

									#another example

									require 'stringio'

									ios = StringIO.new("abcdef\nq9ert \n 12345")

									ios.seek(3)

									ios.ungetc(?w) #replace the char at index 3

									puts "Ptr = #{ios.tell}"

									s1 = ios.gets #filte the "\n" 

									s2 = ios.gets

									puts s1

									puts s2

									#Ruby打开文件并写入数据操作

									txt = File.open("文件路径","w+")

									txt.puts '要写入的文件内容'

									txt.close

									#从文件里读取数据

									num = File.readlines("文件路径")[0].chomp

									#打开文件的方法

									system("notepad 文件路径")
Ruby常用文件操作代码实例

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