通过 SAX 方式生成 XML 文档

SAXTransformerFactory tfactory = (SAXTransformerFactory)SAXTransformerFactory.newInstance();
        try {
            TransformerHandler handler = tfactory.newTransformerHandler();

            Transformer former = handler.getTransformer();
            former.setOutputProperty(OutputKeys.ENCODING, "utf-8");
            former.setOutputProperty(OutputKeys.INDENT, "yes");
            
　　　　　　　handler.setResult(new StreamResult(new FileOutputStream(new File("tree.xml"))));
           
            handler.startDocument();
            AttributesImpl attr  = new AttributesImpl();
            attr.addAttribute("","","id", "", "0");
            handler.startElement("", "", "tree", attr);
            attr.clear();
            attr.addAttribute("","","id", "", "01");
            handler.startElement("", "", "item", attr);
            handler.characters("内容".toCharArray(), 0, 2);//参数：1.节点间文本所需内容，2.内容开始位置，3.截取长度
            handler.endElement("", "", "item");
            handler.endElement("", "", "tree");
            handler.endDocument();
        } catch (TransformerConfigurationException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
           e.printStackTrace();
        } catch (SAXException e) {
           e.printStackTrace();
        }

结果：

<?xml version="1.0" encoding="utf-8"?>
<tree id="0">
<item id="01">内容</item>
</tree>