dom4j 生成xml时,属性值中的回车换行问题

首先属性中的回车换行对我来说非常有用，可是在使用过程中发现dom4j自动把回车换行去掉了。 
我需要生成的部分xml是这样的。 
<data> 
  @H=16*16 
  @C=60 
  我的中国 
  @I=000 
  @K=2 
  @O=000 
  @Q 
</data> 
生成xml的部分代码 

try {
    StringWriter writer = new StringWriter();
    OutputFormat format = OutputFormat.createPrettyPrint();
    format.setEncoding("GB2312");
    XMLWriter xmlwriter = new XMLWriter(writer, format);
    xmlwriter.write(document);
    returnValue = writer.toString();
     } catch (Exception ex) {
       ex.printStackTrace();
   }

用如上代码后生成xml的结果为 
<data>@H=16*16 @C=60  我的中国  @I=000 @K=2 @O=000 @Q</data> 
证实在生成xml前的代码有回车换行后，详细想“一定是dom4j的问题“ 
问题就出在OutputFormat.createPrettyPrint();这上。 

/**
    * A static helper method to create the default pretty printing format. This
    * format consists of an indent of 2 spaces, newlines after each element and
    * all other whitespace trimmed, and XMTML is false.
    *
    * @return DOCUMENT ME!
    */
   public static OutputFormat createPrettyPrint() {
       OutputFormat format = new OutputFormat();
       format.setIndentSize(2);
       format.setNewlines(true);
       format.setTrimText(true);
       format.setPadText(true);

       return format;
   }

   /**
    * A static helper method to create the default compact format. This format
    * does not have any indentation or newlines after an alement and all other
    * whitespace trimmed
    *
    * @return DOCUMENT ME!
    */
   public static OutputFormat createCompactFormat() {
       OutputFormat format = new OutputFormat();
       format.setIndent(false);
       format.setNewlines(false);
       format.setTrimText(true);

       return format;
   }

createPrettyPrint()方法中有 
format.setTrimText(true); 
问题就出在这里。

将format.setTrimText(false); 即可

OutputFormat format = OutputFormat.createPrettyPrint();
        format.setEncoding("utf-8");// 设置XML文件的编码格式
        format.setLineSeparator("\n");
        format.setTrimText(false);
        format.setIndent("	");
		Document doc = DocumentHelper.createDocument();