package gz.itcast.a_dom4j_read;
import java.io.File;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
/**
* 第一个Dom4j读取xml文档的例子
* @author APPle
*
*/
public class Demo1 {
public static void main(String[] args) {
try {
//1.创建一个xml解析器对象
SAXReader reader = new SAXReader();
//2.读取xml文档,返回Document对象
Document doc = reader.read(new File("./src/contact.xml"));
System.out.println(doc);
} catch (DocumentException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
package gz.itcast.a_dom4j_read;
import java.io.File;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
import org.junit.Test;
/**
* 第二个dom4j读取xml文件内容
* 节点
* 标签
* 属性
* 文本
* @author APPle
*
*/
public class Demo2 {
/**
* 得到节点信息
*/
@Test
public void test1() throws Exception{
//1.读取xml文档,返回Document对象
SAXReader reader = new SAXReader();
Document doc = reader.read(new File("./src/contact.xml"));
//2.nodeIterator: 得到当前节点下的所有子节点对象(不包含孙以下的节点)
Iterator<Node> it = doc.nodeIterator();
while(it.hasNext()){//判断是否有下一个元素
Node node = it.next();//取出元素
String name = node.getName();//得到节点名称
//System.out.println(name);
//System.out.println(node.getClass());
//继续取出其下面的子节点
//只有标签节点才有子节点
//判断当前节点是否是标签节点
if(node instanceof Element){
Element elem = (Element)node;
Iterator<Node> it2 = elem.nodeIterator();
while(it2.hasNext()){
Node n2 = it2.next();
System.out.println(n2.getName());
}
}
}
}
/**
* 遍历xml文档的所有节点
* @throws Exception
*/
@Test
public void test2() throws Exception{
//1.读取xml文档,返回Document对象
SAXReader reader = new SAXReader();
Document doc = reader.read(new File("./src/contact.xml"));
//得到根标签
Element rooElem = doc.getRootElement();
getChildNodes(rooElem);
}
/**
* 获取 传入的标签下的所有子节点
* @param elem
*/
private void getChildNodes(Element elem){
System.out.println(elem.getName());
//得到子节点
Iterator<Node> it = elem.nodeIterator();
while(it.hasNext()){
Node node = it.next();
//1.判断是否是标签节点
if(node instanceof Element){
Element el = (Element)node;
//递归
getChildNodes(el);
}
};
}
/**
* 获取标签
*/
@Test
public void test3() throws Exception{
//1.读取xml文档,返回Document对象
SAXReader reader = new SAXReader();
Document doc = reader.read(new File("./src/contact.xml"));
//2.得到根标签
Element rootElem = doc.getRootElement();
//得到标签名称
String name = rootElem.getName();
System.out.println(name);
//3.得到当前标签下指定名称的第一个子标签
/*
Element contactElem = rootElem.element("contact");
System.out.println(contactElem.getName());
*/
//4.得到当前标签下指定名称的所有子标签
/*
Iterator<Element> it = rootElem.elementIterator("contact");
while(it.hasNext()){
Element elem = it.next();
System.out.println(elem.getName());
}
*/
//5.得到当前标签下的的所有子标签
List<Element> list = rootElem.elements();
//遍历List的方法
//1)传统for循环 2)增强for循环 3)迭代器
/*for(int i=0;i<list.size();i++){
Element e = list.get(i);
System.out.println(e.getName());
}*/
/* for(Element e:list){
System.out.println(e.getName());
}*/
/*
Iterator<Element> it = list.iterator(); //ctrl+2 松开 l
while(it.hasNext()){
Element elem = it.next();
System.out.println(elem.getName());
}*/
//获取更深层次的标签(方法只能一层层地获取)
Element nameElem = doc.getRootElement().
element("contact").element("name");
System.out.println(nameElem.getName());
}
/**
* 获取属性
*/
@Test
public void test4() throws Exception{
//1.读取xml文档,返回Document对象
SAXReader reader = new SAXReader();
Document doc = reader.read(new File("./src/contact.xml"));
//获取属性:(先获的属性所在的标签对象,然后才能获取属性)
//1.得到标签对象
Element contactElem = doc.getRootElement().element("contact");
//2.得到属性
//2.1 得到指定名称的属性值
/*
String idValue = contactElem.attributeValue("id");
System.out.println(idValue);
*/
//2.2 得到指定属性名称的属性对象
/*Attribute idAttr = contactElem.attribute("id");
//getName: 属性名称 getValue:属性值
System.out.println(idAttr.getName() +"=" + idAttr.getValue());*/
//2.3 得到所有属性对象,返回LIst集合
/*List<Attribute> list = contactElem.attributes();
//遍历属性
for (Attribute attr : list) {
System.out.println(attr.getName()+"="+attr.getValue());
}*/
//2.4 得到所有属性对象,返回迭代器
Iterator<Attribute> it = contactElem.attributeIterator();
while(it.hasNext()){
Attribute attr = it.next();
System.out.println(attr.getName()+"="+attr.getValue());
}
}
/**
* 获取文本
*/
@Test
public void test5() throws Exception{
//1.读取xml文档,返回Document对象
SAXReader reader = new SAXReader();
Document doc = reader.read(new File("./src/contact.xml"));
/**
* 注意: 空格和换行也是xml的内容
*/
String content = doc.getRootElement().getText();
System.out.println(content);
//获取文本(先获取标签,再获取标签上的文本)
Element nameELem =
doc.getRootElement().element("contact").element("name");
//1. 得到文本
String text = nameELem.getText();
System.out.println(text);
//2. 得到指定子标签名的文本内容
String text2 =
doc.getRootElement().element("contact").elementText("phone");
System.out.println(text2);
}
}
package gz.itcast.a_dom4j_read;
import java.io.File;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.Text;
import org.dom4j.io.SAXReader;
import org.junit.Test;
/**
* 练习-完整读取xml文档内容
* @author APPle
*
*/
public class Demo3 {
@Test
public void test() throws Exception{
//读取xml文档
SAXReader reader = new SAXReader();
Document doc =
reader.read(new File("./src/contact.xml"));
//读取根标签
Element rootELem = doc.getRootElement();
StringBuffer sb = new StringBuffer();
getChildNodes(rootELem,sb);
System.out.println(sb.toString());
}
/**
* 获取当前标签的所有子标签
*/
private void getChildNodes(Element elem,StringBuffer sb){
//System.out.println(elem.getName());
//开始标签
sb.append("<"+elem.getName());
//得到标签的属性列表
List<Attribute> attrs = elem.attributes();
if(attrs!=null){
for (Attribute attr : attrs) {
//System.out.println(attr.getName()+"="+attr.getValue());
sb.append(" "+attr.getName()+"=\""+attr.getValue()+"\"");
}
}
sb.append(">");
//得到文本
//String content = elem.getText();
//System.out.println(content);
Iterator<Node> it = elem.nodeIterator();
while(it.hasNext()){
Node node = it.next();
//标签
if(node instanceof Element){
Element el = (Element)node;
getChildNodes(el,sb);
}
//文本
if(node instanceof Text){
Text text = (Text)node;
sb.append(text.getText());
}
}
//结束标签
sb.append("</"+elem.getName()+">");
}
}
package gz.itcast.a_dom4j_read;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
/**
* 把xml文档信息封装到对象中
* @author APPle
*
*/
public class Demo4 {
public static void main(String[] args) throws Exception{
List<Contact> list = new ArrayList<Contact>();
//读取xml,封装对象
SAXReader reader = new SAXReader();
Document doc = reader.read(new File("./src/contact.xml"));
//读取contact标签
Iterator<Element> it = doc.getRootElement().elementIterator("contact");
while(it.hasNext()){
Element elem = it.next();
//创建Contact
Contact contact = new Contact();
contact.setId(elem.attributeValue("id"));
contact.setName(elem.elementText("name"));
contact.setAge(elem.elementText("age"));
contact.setPhone(elem.elementText("phone"));
contact.setEmail(elem.elementText("email"));
contact.setQq(elem.elementText("qq"));
list.add(contact);
}
for (Contact contact : list) {
System.out.println(contact);
}
}
}
package gz.itcast.a_dom4j_read;
public class Contact {
private String id;
private String name;
private String age;
private String phone;
private String email;
private String qq;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getQq() {
return qq;
}
public void setQq(String qq) {
this.qq = qq;
}
@Override
public String toString() {
return "Contact [age=" + age + ", email=" + email + ", id=" + id
+ ", name=" + name + ", phone=" + phone + ", qq=" + qq + "]";
}
}
contact.xml
<?xml version="1.0" encoding="utf-8"?>
<contactList>
<contact id="001">
<name>张三</name>
<age>20</age>
<phone>134222223333</phone>
<email>zhangs[email protected]</email>
<qq>432221111</qq>
</contact>
<contact id="002">
<name>李四</name>
<age>20</age>
<phone>134222225555</phone>
<email>[email protected]</email>
<qq>432222222</qq>
</contact>
</contactList>
时间: 2024-10-12 09:00:47