Question

我有一个日志文件，看起来有一个时间戳，后跟一个标签，然后是一串JSON。

10/28/2014 00:04:51 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我有代码读取输入文件，我试图从字符串中获取值，如此。

require 'json'

input = File.open("input.txt", 'r')

input.each do |line|
    line = line.split("\t")
    my_json = line[1].to_json
    puts my_json["cpu"]
end

最终结果如下：

C:\>ruby test.rb
 cpu

我不完全确定字符串本身是否格式不正确，或者我是否正确调用该值。

Answer 1

在控制台内运行此代码并检查返回但我很确定你无法调用

my_json["cpu"]

您需要拨打以下内容：

my_json["servers"].first["cpu"]

Answer 2

my_json = line[1].to_json

将获取一个对象并将其转换为JSON，而不是将现有的JSON字符串解析为ruby对象。您将在JSON字符串中找到转义字符串。

你需要像

这样的东西

my_json = JSON.parse(line[1])

您可以通过输出my_json到stdout：

来验证这是否正常工作

$stdout << my_json.class.name

你应该有一个Hash或Openstruct的实例。

Answer 3

考虑一下：

require 'json'

line = '10/28/2014 00:04:51 {"servers":[{"id":833495,"account_id":39033}]}'
JSON[line[/\{.+}/]]
# => {"servers"=>[{"id"=>833495, "account_id"=>39033}]}

这意味着您可以将解析代码缩减为：

File.foreach("input.txt") do |line|
  data = JSON[line[/\{.+}/]]
  # do something with the data
end

正则表达式是贪婪的，因此/\{.+}/将从第一个{开始，直到它找到最后一个}，然后返回起始和结束括号，以及介于两者之间的所有内容。

JSON []方法足够聪明，知道如果它的参数是一个字符串，它应该尝试解析它并返回一个Ruby数组或哈希。如果参数是Array或Hash，它将序列化它。

注意：这不是必要的，并且绝对不希望像您一样包含大量数据样本。将其降低到证明问题所需的最低限度。

从文本文件中解析JSON

3 个答案: