Java操作XML编程实例解析(3)_Xml教程

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推荐:利用XSLT来换XML的根
写程序需要换XML的根,感觉很不便,于是写了一个函数,大致思路及实现如下: 首先觉得利用XSLT还能过滤一些东西,然后再发送回客户端,所以决定采用XSLT 然后就是尝试写一个换根的XSL,如下

 private void readXMLFile(String inFile) throws Exception {
//为解析XML作准备
//创建DocumentBuilderFactory实例,指定DocumentBuilder
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = null;
try {
db = dbf.newDocumentBuilder();
} catch (ParserConfigurationException pce) {
System.err.println(pce);
//出异常时输出异常信息,然后退出,下同
System.exit(1);
}
Document doc = null;
try {
doc = db.parse(inFile);
} catch (DOMException dom) {
System.err.println(dom.getMessage());
System.exit(1);
} catch (IOException ioe) {
System.err.println(ioe);
System.exit(1);
}
//下面是解析XML的全过程,
//比较简单,先取根元素"学生花名册"
Element root = doc.getDocumentElement();
//取"学生"元素列表
NodeList students = root.getElementsByTagName("学生");
for (int i = 0; i < students.getLength(); i ) {
//依次取每个"学生"元素
Element student = (Element) students.item(i);
//创建一个学生的Bean实例
StudentBean studentBean = new StudentBean();
//取学生的性别属性
studentBean.setSex(student.getAttribute("性别"));
//取"姓名"元素,下面类同
NodeList names = student.getElementsByTagName("姓名");
if (names.getLength() == 1) {
Element e = (Element) names.item(0);
Text t = (Text) e.getFirstChild();
studentBean.setName(t.getNodeValue());
}NodeList ages = student.getElementsByTagName("年龄");
if (ages.getLength() == 1) {
Element e = (Element) ages.item(0);
Text t = (Text) e.getFirstChild();
studentBean.setAge(Integer.parseInt(t.getNodeValue()));
}NodeList phones = student.getElementsByTagName("电话");
if (phones.getLength() == 1) {
Element e = (Element) phones.item(0);
Text t = (Text) e.getFirstChild();
studentBean.setPhone(t.getNodeValue());
}student_Vector.add(studentBean);
}
}private void writeXMLFile(String outFile) throws Exception {
//为解析XML作准备,
//创建DocumentBuilderFactory实例,指定DocumentBuilder
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = null;
try {
db = dbf.newDocumentBuilder();
} catch (ParserConfigurationException pce) {
System.err.println(pce);
System.exit(1);
}Document doc = null;
doc = db.newDocument();//下面是建立XML文档内容的过程,
/先建立根元素"学生花名册"
Element root = doc.createElement("学生花名册");
//根元素添加上文档
doc.appendChild(root);//取学生信息的Bean列表
for (int i = 0; i < student_Vector.size(); i ) {
//依次取每个学生的信息
StudentBean studentBean = (StudentBean) student_Vector.get(i);
//建立"学生"元素,添加到根元素
Element student = doc.createElement("学生");
student.setAttribute("性别", studentBean.getSex());
root.appendChild(student);
//建立"姓名"元素,添加到学生下面,下同
Element name = doc.createElement("姓名");
student.appendChild(name);
Text tName = doc.createTextNode(studentBean.getName());
name.appendChild(tName);Element age = doc.createElement("年龄");
student.appendChild(age);
Text tAge = doc.createTextNode(String.valueOf(studentBean.getAge()));
age.appendChild(tAge);Element phone = doc.createElement("电话");
student.appendChild(phone);
Text tPhone = doc.createTextNode(studentBean.getPhone());
phone.appendChild(tPhone);
}
//把XML文档输出到指定的文件
FileOutputStream outStream = new FileOutputStream(outFile);
OutputStreamWriter outWriter = new OutputStreamWriter(outStream);
((XmlDocument) doc).write(outWriter, "GB2312");
outWriter.close();
outStream.close();
}


最后加入测试主函数,如下:

 public static void main(String[] args) throws Exception {
//建立测试实例
XMLTest xmlTest = new XMLTest();
//初始化向量列表
xmlTest.student_Vector = new Vector();System.out.println("开始读Input.xml文件");
xmlTest.readXMLFile("Input.xml");System.out.println("读入完毕,开始写Output.xml文件");
xmlTest.writeXMLFile("Output.xml");
System.out.println("写入完成");
}

好了,保存好StudentBean和XMLTest,把Input.xml保存到工作目录下。可以看到"写入完成"了。

分享:读取XML为行记录
以下为引用的内容: 1 declare @x xml 2 set @x='<book genre="security" publicationdate="2002" ISBN="0-7356-1588-2&

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来源:模板无忧//所属分类:Xml教程/更新时间:2008-08-22
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