encoding_gbk_to_utf8.rb

# encoding: utf-8

def to_utf8(str_gbk, str_gb2312)
  ## 使用encode方法将字符串分别转换为UTF-8编码后再连接
  str_gbk.encode("UTF-8") + str_gb2312.encode("UTF-8")
end

## 像下面这样执行
str_gbk  = "你好".encode("GBK")
str_gb2312 = "再见".encode("GB2312")

puts to_utf8(str_gbk, str_gb2312)