Example tutorials for parsing JSON-formatted data in Ruby and Ruby on Rails _ruby topics

Ruby parsing JSON
Ruby Parsing JSON Example:

JSON = ' ["A", "B", "C"] '
puts "Unsafe #{unsafe_json
(JSON). Inspect}" 
#输出Unsafe 
["A", "B", "C"] 

Ruby parses JSON to parse the above JSON string into array. Such a method is not safe, for example:

JSON = ' puts ' Danger'll 
Robinson ' 
puts ' Unsafe #{unsafe_json
(JSON). Inspect} " 

And what should we export? Unfortunately, there is nothing to parse, jump out a warning: 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 
waiter.synchronize
do wait_ cond.wait_while {ret.nil.}  
End return ret< C18/>end  
@ @parser = Safejson.build_safe_json  
# Safely parse the JSON input  
def safejson.parse (input)  
@ @parser. Call (input)  
rescue Securityerror return  
nil  
end 
 

Containing this module, you can use Ruby to parse JSON:

Peoples=safejson.parse ('
{"Peoples '): [{" Name ":" site120 ","
Email ":" site120@163.com "," Sex ":" Male "},
{ ' Name ': ' site120_2 ', ' email ': ' site1
20@163.com_2 ', ' sex ': ' Male _2 '} '} ' puts peoples[' peoples '][1][' 
name '
 #输出site120_2 

Ruby on Rails
Rails has built-in AJAX support through the RJS, and perhaps not many opportunities to use JSON, but as a convenient format for data interchange or a value note, the following

Use the JSON plugin here, install the command

Gem Install Json_pure

Use examples:

 Require "Open-uri"
 require ' JSON '

 def index
  uri = ' * * * *
  response = nil
  begin
   Open (URI) do | http|
    Response = Http.read
   end
   @json = json::p arse (response)
  rescue => Text
   # exception handling
   Logger.error ("getmaillistserror=" + text)
   Flash.now[:error] = ' Get mailing list failed. '
  End
 

Here the JSON parser requires that the JSON-formatted key must be quoted, and an exception is resolved if there are no quotes.