This article will include many usefull examples. Let's enjoy Ruby! 
HTTP Client
Here is am example shows how to write HTTP client with Ruby.
require 'net/http'
def fetch(loc, port, url)
z=nil
h=Net::HTTP.new(loc,port)
begin
resp, data = h.get(url,z)
puts "Code = #{resp.code} #{resp.message}"
resp.each {|key, val| printf "%-14s = %-40.40s\n", key, val}
p data
rescue Net::ProtoFatalError => detail
head = detail.data
head.each {|key,val| puts "#{key} #{val}"}
if head.code=="404"
puts "File not Found"
elsif head.code=="401"
print "Authorization Required\n User name?"
gets
uname=$_.chomp
print "Password?"
gets
pwd=$_.chomp
unpwd=uname + ":" + pwd
puts unpwd
hval=[unpwd].pack("m")
z={'Authorization' => 'Basic ' + hval}
retry
end
rescue SystemCallError
puts "Can't connect"
end
end
fetch('www.google.com', 80, '/')
Send email
Send email with Ruby:
1 require 'net/smtp'
2 SMTP_HOST = "192.168.60.99"
3
4 def send(from, to, subject, msg)
5 mail = "To: #{to}\r\n" +
6 "From: #{from}\r\n" +
7 "Subject: #{subject}\r\n" +
8 "\r\n" +
9 msg
10
11 Net::SMTP.start(SMTP_HOST) do |smtp|
12 smtp.send_mail(mail, from, to)
13 end
14 end
15
16 from = "blake@192.168.60.99"
17 to = ["blake@192.168.60.99"]
18 send(from, to, "test", "Just a test!\ntest")
Notice:
1. 'mail' is the email body, it use "\r\n" to separate the mail header and mail context. So if you only want to send context without header, you should write: "mail = "\r\n" + msg". Otherwise your email will lost the context.
Calculate the total line number of files in one folder
This is one small tools to get the total file line number of on folder.
1POST_FIX = %w{java jsp html xml properties}
2EXCLUDE_DIR = %w{CVS}
3$displayStr = ""
4$fileReg = ""
5$dirReg = "\\.|\\.\\.|"
6
7def sumLine(fileName)
8 file = open fileName
9 begin
10 while file.gets()
11 end
12 ensure
13 file.close
14 end
15 $.
16end
17
18def iteDir(name, level=0)
19 lines = 0
20 dir = Dir.open name
21 rex = /\. + "java" +$|\.jsp$|\.html$/
22 begin
23 dir.each do |fileName|
24 fileName = dir.path + '/' + fileName
25 if File.ftype(fileName) =~ /directory/
26 if not fileName =~ Regexp.new($dirReg)
27 lines += iteDir(fileName, level+1)
28 else
29 next
30 end
31 elsif fileName =~ Regexp.new($fileReg)
32 lines += sumLine(fileName)
33 end
34 end
35 ensure
36 dir.close
37 end
38 str = ""
39 for i in 0..(level-1)
40 str += "\t|"
41 end
42 if level != 0
43 str += "---"
44 end
45 $displayStr = "#{str}#{name}\t#{lines} lines\n#{$displayStr}"
46 lines
47end
48
49POST_FIX.each do |postfix|
50 $fileReg += "\.#{postfix}$|"
51end
52$fileReg = $fileReg.chop
53
54EXCLUDE_DIR.each do |excludeDir|
55 $dirReg += "^#{excludeDir}$|"
56end
57$dirReg = $dirReg.chop
58
59print "Total #{iteDir("E:/_MyWorkSpace/IDEA_Proj")} lines\n"
60print $displayStr
Keystone:
1. Ruby I/O access. Dir and File
2. Regexp & String -> Regexp
3. Some kinds of variables
4. Array operation
Technorati Tags: Ruby 
