java dom 解析xm 只写几句关键代码

[cyber_telecaster]

如题，xml 其他内容省略
<paper uid="125">
<pid id="15" filename="1.word"/>
<filemd5>8s9d8zxda3sda7</filemd5>
</paper>
要求添加一个上述的paper节点及其子节点,只写关键代码 ，请问该怎么写？

[程序源自程序猿]

File file = new File("D:\\test.xml");
SAXReader reader = new SAXReader();
Document doc = reader.read(file);
Element dicts = (Element) doc.selectSingleNode("//paper父节点");
dicts.addElement("");
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("UTF-8");
XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);
writer.write(doc);
  
writer.close();

大概这样吧

[cyber_telecaster]

引用 1 楼 justsmilence 的回复:

Java code?1234567891011File file = new File("D:\\test.xml");SAXReader reader = new SAXReader();Document doc = reader.read(file);Element dicts = (Element) doc.selectSingleNode("//paper父节点"……

恩。谢啦 还想问一下。 我在一个类中写了如下代码 static File file;// 共享的文件对象 static { try { file = new File("\\usrUploadedFiles\\attachments_config.xml"); System.out.println(file.length()); } catch (Exception ex) { ex.printStackTrace(); System.out.println("An error occured in creating File"); } } 为什么file.length=0?

[程序源自程序猿]

引用 2 楼 cyber_telecaster 的回复:

引用 1 楼 justsmilence 的回复:Java code?1234567891011File file = new File("D:\\test.xml");SAXReader reader = new SAXReader();Document doc = reader.read(file);Element dicts = (Element) doc.selec……

文件路径，应该是文件不存在\\usrUploadedFiles\\attachments_config.xml，你换成绝对路径试试