pojo.rb

# -*- coding: utf-8 -*-
require 'json'

str = '{"a":"string","b":12,"c":2.12,"d":9223372036854775807,"e":0.142318719237491324918231415143121324,"f":[1,3,4,5,6] }'

class JavaGenerator
  
  def initialize(name, config={})
    @name = name
    @config = config
    @baseJavaType = 
      {
      "String" => "String",
      "Fixnum" => "int",
      "Bignum" => "long",
      "Float" => "double",
      "TrueClass" => "boolean",
      "FalseClass" => "boolean"
    }
    @baseImport = [
                   "import org.json.*;",
                   "import java.util.*;"
                  ]
  end
  
  def parse(json)
    @members = []
    json.each {|k,v| @members << {"name" => "#{k}","type" => "#{toType(k,v)}"}}
  end
  
  def toType(name,type)
    className = type.class.to_s
    
    if className == "Hash"
      ## TODO 建立子类
      ## 返回类目作为类型名
      return name.capitalize
    end
    if className == "Array"
      ## TODO 遍历数组 检查类型。返回泛型数组
      return "ArrayList<#{name.capitalize}>"
    end
    return @baseJavaType[className]
  end
  
  def to_s
    super + "#{@name}\nMembers:#{@members}"
  end
end

j = JavaGenerator.new("test")
j.parse(JSON.parse(str))
puts j