使用builder创建XML

首先，我们需要确保已经安装了builder，如果还没有安装，可以使用下面的命令进行安装：

 

gem install builder

 

接下来，我们来看一下使用builder创建XML的例子。

 

    require 'builder'

    x = Builder::XmlMarkup.new(:target => $stdout, :indent => 1)
    # :target =＞$stdout ：输出内容将被写向标准输出控制台
    # :indent =＞1 ：XML输出形式将被缩进一个空格字符
    x.instruct! :xml, :version => '1.1', :encoding => 'gb2312'
    x.comment! "书本信息"
    x.library("shelf" => "Recent Acquisitions") {
      x.section("name" => "ruby"){
        x.book("isbn" => "0672310001"){
          x.title "Programming Ruby"
          x.author "Yukihiro"
          x.description "Programming Ruby - The Pragmatic Programmer's Guide"
        }
      }
    }

 

XML输出结果：

 

<?xml version="1.1" encoding="gb2312"?>
<!-- 书本信息 -->
<library shelf="Recent Acquisitions">
 <section name="ruby">
  <book isbn="0672310001">
   <title>Programming Ruby</title>
   <author>Yukihiro</author>
   <description>Programming Ruby - The Pragmatic Programmer's Guide</description>
  </book>
 </section>
</library>
<inspect/>