Parse Json IN Ruby

The Ruby language is widely used and can be used in a simple and flexible way to help us implement many functional requirements. Ruby parses Json in a very simple way.

• Ruby special syntax concepts
• Example of Ruby code for getting the current class name
• Ruby module OpenURI to get http/FTP address content
• Analysis of Ruby encryption implementation code examples
• Ruby blocks provides flexible encoding methods

Example of Json parsing IN Ruby:

1. Json = '["a", "B", "C"]'
2. Puts "Unsafe # {unsafe_json
   (Json). inspect }"
3. # Output Unsafe
   ["A", "B", "C"]

Ruby parses Json to parse the preceding json string into an Array. This method is not safe, for example:

 
 

  
  
json = 'puts "Danger 
Will Robinson"' 
  
  
puts "Unsafe #{unsafe_json
(json).inspect}"  
 
 

What should I output? Unfortunately, nothing can be parsed. A warning is displayed: warning: character class has '[' without escape security method is as follows:

 
 

  
  
module SafeJSON   
  
  
require 'monitor'   
  
  
def SafeJSON.build_safe_json   
  
  
ret = nil   
  
  
waiter = ''   
  
  
waiter.extend(MonitorMixin)   
  
  
wait_cond = waiter.new_cond   
  
  
Thread.start do   
  
  
$SAFE = 4   
  
  
ret = Proc.new {|json|   
  
  
eval(json.gsub(/(["'])/s*:/s*
(['"0-9tfn/[{])/){"#{$1}=>#{$2}"}) }   
  
  
waiter.synchronize do wait_cond.signal   
  
  
end   
  
  
end  
  
  
waiter.synchronize do wait_
cond.wait_while { ret.nil? } end   
  
  
return ret   
  
  
end   
  
  
@@parser = SafeJSON.build_safe_json   
  
  
# Safely parse the JSON input   
  
  
def SafeJSON.parse(input)   
  
  
@@parser.call(input)   
  
  
rescue SecurityError   
  
  
return nil   
  
  
end  
  
  
end  
 
 

With this Module, you can use Ruby to parse Json:

 
 

  
  
Using les = SafeJSON. parse ('
{"Les": [{"name": "site120 ","
Email ":" site120@163.com "," sex ":" male "},
{"Name": "site120_2", "email": "site1
20@163.com _ 2 "," sex ":" male _ 2 "}]} ')
  
  
Puts cmdles ["cmdles"] [1] ["name"]
# Output site120_2
 
 

Rails has built-in AJAX support through RJS. There may not be many opportunities to use json. However, as a convenient data exchange format, pay attention to the value.