http://www.dom4j.org/
目前最新dom4j包下載地址:
http://nchc.dl.sourceforge.net/sourceforge/dom4j/dom4j-1.6.1.zip
解開(kāi)后有兩個(gè)包,僅操作XML文檔的話(huà)把dom4j-1.6.1.jar加入工程就可以了,如果需要使用XPath的話(huà)還需要加入包jaxen-1.1-beta-7.jar.
以下是相關(guān)操作:
一.Document對象相關(guān)
1.讀取XML文件,獲得document對象. SAXReader reader = new SAXReader();
Document document = reader.read(new File("input.xml")); 2.解析XML形式的文本,得到document對象. String text = "<members></members>";
Document document = DocumentHelper.parseText(text); 3.主動(dòng)創(chuàng )建document對象.
Document document = DocumentHelper.createDocument();
Element root = document.addElement("members");// 創(chuàng )建根節點(diǎn) 二.節點(diǎn)相關(guān)
1.獲取文檔的根節點(diǎn).
Element rootElm = document.getRootElement(); 2.取得某節點(diǎn)的單個(gè)子節點(diǎn).Element memberElm=root.element("member");// "member"是節點(diǎn)名 3.取得節點(diǎn)的文字String text=memberElm.getText(); 也可以用:
String text=root.elementText("name"); 這個(gè)是取得根節點(diǎn)下的name字節點(diǎn)的文字.
4.取得某節點(diǎn)下名為"member"的所有字節點(diǎn)并進(jìn)行遍歷.List nodes = rootElm.elements("member");
for (Iterator it = nodes.iterator(); it.hasNext();) {
Element elm = (Element) it.next();
// do something
} 5.對某節點(diǎn)下的所有子節點(diǎn)進(jìn)行遍歷. for(Iterator it=root.elementIterator();it.hasNext();){
Element element = (Element) it.next();
// do something
} 6.在某節點(diǎn)下添加子節點(diǎn).Element ageElm = newMemberElm.addElement("age"); 7.設置節點(diǎn)文字.8.刪除某節點(diǎn).parentElm.remove(childElm);// childElm是待刪除的節點(diǎn),parentElm是其父節點(diǎn) 三.屬性相關(guān).1.取得某節點(diǎn)下的某屬性 Element root=document.getRootElement();
Attribute attribute=root.attribute("size");// 屬性名name 2.取得屬性的文字 String text=attribute.getText(); 也可以用:
String text2=root.element("name").attributeValue("firstname"); 這個(gè)是取得根節點(diǎn)下name字節點(diǎn)的屬性firstname的值.
3.遍歷某節點(diǎn)的所有屬性 Element root=document.getRootElement();
for(Iterator it=root.attributeIterator();it.hasNext();){
Attribute attribute = (Attribute) it.next();
String text=attribute.getText();
System.out.println(text);
} 4.設置某節點(diǎn)的屬性和文字.newMemberElm.addAttribute("name", "sitinspring"); 5.設置屬性的文字 Attribute attribute=root.attribute("name");
attribute.setText("sitinspring"); 6.刪除某屬性
Attribute attribute=root.attribute("size");// 屬性名name
root.remove(attribute); 四.將文檔寫(xiě)入XML文件.
1.文檔中全為英文,不設置編碼,直接寫(xiě)入的形式.XMLWriter writer = new XMLWriter(new FileWriter("output.xml"));
writer.write(document);
writer.close(); 2.文檔中含有中文,設置編碼格式寫(xiě)入的形式.
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("GBK"); // 指定XML編碼
XMLWriter writer = new XMLWriter(new FileWriter("output.xml"),format);
writer.write(document);
writer.close(); 五.字符串與XML的轉換1.將字符串轉化為XMLString text = "<members> <member>sitinspring</member> </members>";
Document document = DocumentHelper.parseText(text); 2.將文檔或節點(diǎn)的XML轉化為字符串. SAXReader reader = new SAXReader();
Document document = reader.read(new File("input.xml"));
Element root=document.getRootElement();
String docXmlText=document.asXML();
String rootXmlText=root.asXML();
Element memberElm=root.element("member");
String memberXmlText=memberElm.asXML(); 六.使用XPath快速找到節點(diǎn).
讀取的XML文檔示例<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>MemberManagement</name>
<comment></comment>
<projects>
<project>PRJ1</project>
<project>PRJ2</project>
<project>PRJ3</project>
<project>PRJ4</project>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
</projectDescription>
使用XPath快速找到節點(diǎn)project. public static void main(String[] args){
SAXReader reader = new SAXReader();
try{
Document doc = reader.read(new File("sample.xml"));
List projects=doc.selectNodes("/projectDescription/projects/project");
Iterator it=projects.iterator();
while(it.hasNext()){
Element elm=(Element)it.next();
System.out.println(elm.getText());
}
}
catch(Exception ex){
ex.printStackTrace();
}
}
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