dom4j 写入 standalone

扩展XMLWriter

 

public class StandaloneWriter extends XMLWriter{
    StandaloneWriter(Writer writer,OutputFormat outputFormat){
        super(writer,outputFormat);
    }
    protected void writeDeclaration() throws IOException {
        OutputFormat format = getOutputFormat();

        String encoding = format.getEncoding();

        if (!format.isSuppressDeclaration()) {
          if (encoding.equals("UTF8")) {
            writer.write("<?xml version=\"1.0\"");

            if (!format.isOmitEncoding()) {
              writer.write(" encoding=\"UTF-8\"");
            }

            writer.write(" standalone=\"yes\"");
            writer.write("?>");
          } else {
            writer.write("<?xml version=\"1.0\"");

            if (!format.isOmitEncoding()) {
              writer.write(" encoding=\"" + encoding + "\"");
            }

            writer.write(" standalone=\"true\"");
            writer.write("?>");
          }

          if (format.isNewLineAfterDeclaration()) {
            println();
          }
        }
    }
}