dom4j 解析 XML
dom4j 解析 XML
使用 domj4 API 创建与修改 XML 文档
创建xml文档
例：public static void main(String[] args) throws IOException {
// documentHelper的createDocument()方法创建document对象
Document document = DocumentHelper.createDocument();
// 增加一个根节点
Element root = document.addElement("books");
// 添加4个元素
//根元素
Element book = root.addElement("book");
book.addAttribute("ss", "123");
//子元素
Element name = book.addElement("name");
name.setText("java开发");
//子元素
Element author = book.addElement("author");
author.setText("kou_xiao_lin");
//子元素
Element price = book.addElement("price");
price.setText("200");
//设置输出格式
OutputFormat format=new OutputFormat(" ",true,"utf-8");
XMLWriter xw=new XMLWriter(new FileWriter("src//bk.xml"),format);
xw.write(document);
xw.close();
}运行效果如下：
<?xml version="1.0" encoding="utf-8"?>
<books>
<book ss="123">
<name>java开发</name>
<author>kou_xiao_lin</author>
<price>200</price>
</book>
</books>
解析元素和元素的属性
例：<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE books[
<!ELEMENT books (book*)>
<!ELEMENT book (name,author,price)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT price (#PCDATA)>
<!ATTLIST author address CDATA #IMPLIED>
]>
<books>
<book>
<name>Java开发</name>
<author>m_j</author>
<price>10000</price>
</book>
<book>
<name>Java开发1</name>
<author address="保定 何软 ">m_j1</author>
<price>10000</price>
</book>
<book>
<name>Java开发</name>
<author>m_j2</author>
<price>10000</price>
</book>
<book>
<name>Java开发</name>
<author>m_j3</author>
<price>10000</price>
</book>
</books>
解析如下：
public static void main(String[] args) throws DocumentException {
// 读取器
SAXReader reader = new SAXReader();
// 读取文件
Document doc = reader.read(new File("src//book.xml"));
// 获取根结点
Element root = doc.getRootElement();
// 输出根结点的名字
System.out.println(root.getName());
parse(root);
}
/*
* //解析元素
* public static void parse(Element root){
* List<Element>list=root.elements();
* for(Element element:list){
* if(element.isTextOnly()){
* parseAttr(element);
* System.out.println("----"+element.getName());
* System.out.println("----------"+element.getText());
* }else{
* parse(element);
* }
* }
* }
* //解析元素的属性
* public static void parseAttr(Element root){
* List<Attribute> attr=root.attributes();
* for(Attribute attribute:attr){
* System.out.println(attribute.getName()+"--------"
* +attribute.getValue());
* }
* }
*/
// 解析元素 public static void parse(Element root) {
parseAttr(root);
for (Iterator<Element> it = root.elementIterator(); it.hasNext();) {
Element element = it.next();
// 判断是否只是文本
if (element.isTextOnly()) {
parseAttr(element);
System.out.println("----" + element.getName());
System.out.println("----------" + element.getText());
} else {
parse(element);
}
}
}
// 解析元素的属性
private static void parseAttr(Element root) {
for (Iterator<Attribute> it = root.attributeIterator(); it.hasNext();) {
Attribute entity = it.next();
System.out.println(entity.getName() + "--------"
+ entity.getValue());
}
}
}
/*
* 运行结果如下：
* books
*----name
* ----------Java开发
* ----author
* ----------m_j
* ----price
* ----------10000
* ----name
* ----------Java开发1 address--------保定 何软
* ----author
*----------m_j1
*----price
*----------10000
*----name
*----------Java开发
* ----author
*----------m_j2
*----price
*----------10000
*----name
*----------Java开发
* ----author
*----------m_j3
*----price
*----------10000
*/
增加元素
public static void main(String[] args) throws Exception {
// 获取读取器
SAXReader reader = new SAXReader();
// 读文件
Document doc = reader.read(new File("src//bk.xml"));
// 获取根元素
Element root = doc.getRootElement();
// 创建add元素并设置它的文本
Element address = DocumentHelper.createElement("address");
address.setText("保定");
//获取book下的所有元素
List list = root.element("book").elements();
list.add(2, address);
OutputFormat format = new OutputFormat(" ", true, "UTF-8");
XMLWriter xw = new XMLWriter(new FileWriter("src//bk.xml"), format);
xw.write(doc);
xw.close();
}
在指定的位置增加元素
public static void main(String[] args) throws Exception {
// 获取读取器
SAXReader reader = new SAXReader();
// 读文件
Document doc = reader.read(new File("src//bk.xml"));
// 获取根元素
Element root = doc.getRootElement();
// 创建add元素并设置它的文本
Element address = DocumentHelper.createElement("address");
address.setText("衡水");
//获取book下的所有元素
Element book=(Element)root.elements("book").get(2);
List list =book.elements();
list.add(2, address);
OutputFormat format = new OutputFormat(" ", true, "UTF-8");
XMLWriter xw = new XMLWriter(new FileWriter("src//bk.xml"), format);
xw.write(doc);
xw.close();
}
删除元素
public static void main(String[] args) throws Exception {
// 获取读取器
SAXReader reader = new SAXReader();
// 读文件
Document doc = reader.read(new File("src//bk.xml"));
// 获取根元素
Element root = doc.getRootElement();
// 创建add元素并设置它的文本
//获取book下的所有元素
Element book=(Element)root.elements("book").get(2);
Element ww=(Element) book.elements().get(1);
book.remove(ww);
OutputFormat format = new OutputFormat(" ", true, "UTF-8");
XMLWriter xw = new XMLWriter(new FileWriter("src//bk.xml"), format);
xw.write(doc);
xw.close();
}