在文件中搜索模式并在jruby中打印它

Question

我有一个n行文件。我需要在其中搜索一个字段(SessionId及其值)并打印其相应的值。

我已经编写代码来访问文件并逐行打印它。需要帮助获取字段并打印其值

文件示例行:

LastSessionTeardown.cc|598|Resolving:=N2BBSessionGateway.Factory
2013-12-23 06:03:22.488046 UTC VZ_QIP_S3_208 LastSessionTeardown.cc|636 <ERROR>:Failed     to resolve SessionGateway:N2BBSessionGateway.Factory
Cause : user exception, ID 'IDL:omg.org/CosNaming/NamingContext/NotFound:1.0'
2013-12-23 06:03:22.488078 UTC VZ_QIP_S3_208 LastSessionTeardown.cc|640|Total resolved     SessionGateways list(size):=0
2013-12-23 06:03:22.488098 UTC VZ_QIP_S3_208 LastSessionTeardown.cc|642|Out     resolveSGWs::
2013-12-23 06:07:17.485959 UTC VZ_QIP_S3_208 StreamServiceMasterImpl.cc|989|In     createStream::=77D23ECC4649571A367E9C314C4AA7AA
2013-12-23 06:07:17.487706 UTC VZ_QIP_S3_208 StreamServiceMasterImpl.cc|1036|StreamId:     77D23ECC4649571A367E9C314C4AA7AA  **SessionId: C0A800F0DB2A::1387778933::1501** ContentId: vault22_12.mpg 1xGoid: 
2013-12-23 06:07:17.505233 UTC VZ_QIP_S3_208 StreamServiceMasterImpl.cc|989|In     createStream::=E30CC868325B51D288A8E2D95322B840

注意:文件在

字段上下有很多行代码:

require "java"
include_class "java.io.BufferedReader"
include_class "java.io.FileReader"
include_class "java.lang.String"
fileReader = FileReader.new "protocoltiming.log.txt"
bufferReader = BufferedReader.new fileReader
str = bufferReader.readLine
while str
puts str.to_s
str = bufferReader.readLine
 end

请帮助我在这个代码中添加什么?

Answer 1

while str
  str = bufferReader.readLine
  session_id = str.strip.scan(/SessionId: (.+)s/)[0][0] if str.include?("SessionId: ")
  if session_id
    # session_id found
  else
    # session_id not found
  end
end

实际上不需要遍历行。您可以读取文件并使用正则表达式查找所需的文本。但只要适合你的猫。如果文件太大，有时读取整个文件可能会出现问题。

HTH

Answer 2

完成。这个工作!

require "java"
include_class "java.io.BufferedReader"
include_class "java.io.FileReader"
include_class "java.lang.String"
fileReader = FileReader.new "StreamService.log"
bufferReader = BufferedReader.new fileReader
#puts str
str = bufferReader.readLine
while str = bufferReader.readLine
#puts str.to_s
sessionid = ""
  sessionid = str.match(/SessionId:(.*)ContentId/)
  if sessionid.to_s != ''
    puts "Session ID = #{sessionid[1]}"
  end
end