RTEditor/src/main/java/com/onegravity/rteditor/converter/tagsoup/HTMLWriter.java
public void setOutput(Writer writer) {
        if (writer == null) {
            output = new OutputStreamWriter(System.out);
        } else {
            output = writer;
        }
    }
public void setOutput(Writer writer) {
        if (writer == null) {
            output = new OutputStreamWriter(System.out);
        } else {
            output = writer;
        }
    }
Set a new output destination for the document.

@param writer The output destination, or null to use standard output.
@return The current output writer.
@see #flush