创建解析XML文件的三种解析方法(一)

用w3c解析

package w3c;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Random;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

publicclass w3c {
publicstaticvoid main(String[] args)
throws Exception{
createXml();
}

//创建XML文档并创建节点
publicstaticvoid createXml()
throws Exception{
//获取XML解析器工厂类
DocumentBuilderFactory dbf =DocumentBuilderFactory.newInstance();
//获取XML解析器
DocumentBuilder db = dbf.newDocumentBuilder();
//获取操作的document对象
Document document = db.newDocument();
//设置XML文件的版本
document.setXmlVersion("1.0");
//创建根节点
Element root = document.createElement("students");
//将根节点添加到document对象中
document.appendChild(root);
//声明一个姓名的数组
String nameList[] = {"吕布","赵云","马超","张飞","关羽","许褚","孙策","周瑜","夏侯渊","张颌","于禁","黄忠","典韦","曹仁","程普"};

String sexList[] = {"男","女"};
//循环添加数据
for(int i = 0 ;i < 20 ; i++){
//创建根元素节点
Element rootelement = document.createElement("student");
//声明参数ID
String id ="";
//循环生成一个9为的随机ID数
for(int j = 0; j< 9 ; j ++ ){
id += new Random().nextInt(8)+1;
}
//设置根元素节点的属性
rootelement.setAttribute("id",id);
//将根元素节点添加到根节点中
root.appendChild(rootelement);
//设置元素节点
Element name = document.createElement("name");
Element sex = document.createElement("sex");
Element age = document.createElement("age");
Element phone = document.createElement("phone");
//给元素节点赋值
name.setTextContent(nameList[new Random().nextInt(nameList.length)]);
sex.setTextContent(sexList[new Random().nextInt(sexList.length)]);
age.setTextContent(new Random().nextInt(20)+20+"");
String tel ="";
for(int k = 0; k< 7 ; k++ ){
tel += new Random().nextInt(9);
}
phone.setTextContent("0756-"+tel);
//将元素节点添加到根元素节点中
rootelement.appendChild(name);
rootelement.appendChild(sex);
rootelement.appendChild(age);
rootelement.appendChild(phone);
}
//开始把Document映射到文件
TransformerFactory transFactory = TransformerFactory.newInstance();
Transformer transFormer = transFactory.newTransformer();

//生成的XML文件
File file = new File("w3c.xml");
//判断XML文件存不存在，如果不存在则创建
if(file.exists()){
file.createNewFile();
}
//设置是否添加空格
transFormer.setOutputProperty(OutputKeys.INDENT,
"yes");
//设置输出文件的格式
transFormer.setOutputProperty(OutputKeys.ENCODING,
"utf-8");
//输出XML文件
transFormer.transform(new DOMSource(document),
new StreamResult(new FileOutputStream(file)));
//输出XML文件的路径
System.out.println(file.getAbsolutePath());
}
//解析XML文档
publicstaticvoid resolving()
throws Exception{
//获取XML解析器工厂类
DocumentBuilderFactory dbf =DocumentBuilderFactory.newInstance();
//获取XML解析器
DocumentBuilder db = dbf.newDocumentBuilder();
//获取操作的document对象
Document document = db.parse(new File("w3c.xml"));
//获取XML文件的根元素节点
NodeList root = document.getElementsByTagName("student");
//循环根元素节点信息
for(int i = 0 ; i < root.getLength() ;i++){
Element student = (Element)root.item(i);
System.err.println("id = "+student.getAttribute("id")+"
name = "
+student.getElementsByTagName("name").item(0).getTextContent()+"
sex = "
+student.getElementsByTagName("sex").item(0).getTextContent()+"
age = "
+student.getElementsByTagName("age").item(0).getTextContent()+"
phone = "
+student.getElementsByTagName("phone").item(0).getTextContent());
}
}
}