测试例子1
@SuppressWarnings("unchecked")
public class TestDom4j {
private static SAXReader reader;
static{
reader = new SAXReader();
}
/**
* 得到文档的document
* @param is
* @return
* @throws DocumentException
*/
public static Document getDocument( InputStream is ) throws DocumentException{
return reader.read(is );
}
/**
* 得到 xml文件的根元素
* @param doc
* @return
*/
public static Element getRoot( Document doc){
return doc.getRootElement();
}
/**
* document 的遍历 ，通过递归的方式
* @param is
* @return
* @throws DocumentException
*/
public static List readXML( Element root ) throws DocumentException{
List list = new ArrayList();
list = getData(root);
return list;
}
/**
* 递归元素数据
* @param root
* @return
*/
private static List getData(Element root) {
// System.out.println( "节点总数：：："+root.nodeCount());
for(int i=0;i<root.nodeCount();i++){
Node node = root.node(i);
if(node instanceof Element ){
getData((Element)node);
// System.out.println("element node !");
}else{
System.out.println( node.getPath()+" == "+node.getText()+" ");
}
}
return null;
}
/** 查找功能
* /books/book/@show xpath 遍历这个路径下的说有show属性
* /books/book 表示xpath 此路径下的所有元素
* @param node
* @param xpath
*/
public static List getByXpath(Node node,String xpath){
List list = node.selectNodes(xpath);
for(int i=0;i<list.size();i++){
// Attribute attr = (Attribute) list.get(i);
// System.out.println( attr.getValue());
// System.out.println( list.get(i));
}
return list;
}
public static Element addEle(Element parentNode, String childNodeName){
return parentNode.addElement(childNodeName);
}
/**
* 向文件中写入 东西 测试
* @param filepath
* @throws DocumentException
* @throws IOException
*/
public static void writeFile(String filepath ) throws DocumentException, IOException {
File f = new File(filepath);
Document doc = reader.read(f);
Element root = doc.getRootElement();
root.addElement("book").addAttribute("name", "我得书").addElement("title").addText("感觉不是很爽！！");
OutputFormat format = OutputFormat.createPrettyPrint();
XMLWriter writer = new XMLWriter(new FileWriter(new File(filepath)),format);
writer.write(doc);
writer.close();
}
/**
* 增删改的应用
* @throws DocumentException
* @throws IOException
*/
public static void rem_add_update() throws DocumentException, IOException{
File f = new File("D://book.xml");
Document doc = reader.read(f);
Element root = doc.getRootElement();
// List list = getByXpath(root, "/books/book/@show");
// for(int i=0;i<list.size();i++){
// Attribute attr = (Attribute) list.get(i);
// String val = attr.getValue();
// if("none".equals( val )){
// attr.setValue("处理");
// }
// }
List list_ele = getByXpath(root, "/books/book");
System.out.println( list_ele.size());
for(int i=0;i<list_ele.size();i++){
Element ele = (Element) list_ele.get(i);
ele.addAttribute("public", "5"); //添加属性 如果属性存在则修改属性
//删除文档中左后一个元素
if( i==(list_ele.size()-1) ) root.remove( ele );
}
XMLWriter writer = new XMLWriter(new FileWriter(new File("D://book.xml")) );
writer.write(doc);
writer.close();
}
public static void main(String[] args) throws DocumentException, IOException {
// InputStream is = TestDom4j.class.getClassLoader().getSystemResourceAsStream ("book.xml");
// Document doc = getDocument(is);
// Element root = getRoot(doc);
// readXML( root );
File f = new File("D://book.xml");
Document doc = reader.read(f);
Element root = doc.getRootElement();
// List list = getByXpath(root, "/books/book/@show");
// for(int i=0;i<list.size();i++){
// Attribute attr = (Attribute) list.get(i);
// String val = attr.getValue();
// if("none".equals( val )){
// attr.setValue("处理");
// }
// }
// getByXpath(root, "/books/book");
}
}
------------ ---xml文件
<?xml version="1.0" encoding="UTF-8"?>
<books>
<book show="yes">
<title>此处的添加方法 是根元素books已经存在的情况下dom4j 练习21</title>
</book>
<book show="no">
<title>java 变成思想</title>
</book>
<book show="yes">
<title>java程序设计</title>
</book>
<book show="none">
<title>java程序设计</title>
</book>
</books>
测试的例子2
package dom4j;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class Dom4jDemo {
/**
*
* @param fileName
* 生成的xml文件名
* @param txtName
* 包含的对账文件txt文件名
*/
public void createXml(String fileName, String txtName) {
Document document = DocumentHelper.createDocument();
Element root = document.addElement("root");
Element head = root.addElement("head");
Element type = head.addAttribute("type", "0");
Element code = head.addAttribute("code", "3003");
Element yhlb = head.addElement("yhlb");
yhlb.setText("01");
Element username = head.addElement("username");
username.setText("gsyh");
Element password = head.addElement("password");
password.setText("zheshimima");
Element body = root.addElement("body");
Element data = body.addElement("data");
Element dzwjm = data.addElement("dzwjm");
dzwjm.setText(txtName);
try {
// 写入文件
Writer fileWriter = new FileWriter(fileName);
OutputFormat format = OutputFormat.createPrettyPrint();
XMLWriter xmlWriter = new XMLWriter(fileWriter, format);
xmlWriter.write(document);
xmlWriter.close();
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
/**
*
* @param fileName
* 要解析的文件名
* @return 解析xml文件得到的需要对账的文件名
*/
public String parserXml(String fileName) {
String findFileName = "";
File inputXml = new File(fileName);
SAXReader saxReader = new SAXReader();
try {
Document document = saxReader.read(inputXml);
Element root = document.getRootElement();
for (Iterator i = root.elementIterator(); i.hasNext();) {
Element head = (Element) i.next();
for (Iterator j = head.elementIterator(); j.hasNext();) {
Element elem = (Element) j.next();
System.out.println(elem.getName() + ":" + elem.getText());
for (Iterator k = elem.elementIterator(); k.hasNext();) {
Element last = (Element) k.next();
System.out.println(last.getName() + ":"
+ last.getText());
findFileName = last.getText();
}
}
}
} catch (DocumentException e) {
System.out.println(e.getMessage() + "hello");
}
System.out.println("dom4j parserXml");
return findFileName;
}
/**
* 测试main方法
*
* @param args
*/
public static void main(String[] args) {
Dom4jDemo demo = new Dom4jDemo();
// demo.createXml("D://request.xml", "test.txt");
demo.parserXml("d://request.xml");
}
}