jdom 封装类。解析、读取、修改、写入（主要方法）。节点可以无限扩展。

jdom 封装类。解析、读取、修改、写入（主要方法）。节点可以无限扩展。

package com.jbp.xml;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
import org.jdom.xpath.XPath;
public class XmlDbUntl {
private static Document document = null;

protected static File readFile(File file) throws IOException {
try {
if (file.exists()) {
return file;
}
} catch (Exception e) {
throw new IOException("找不到文件" + e.getMessage());
}
throw new IOException("找不到文件");
}

public static boolean appendElement(File file,Element element,String express){
try{
List list=XPath.newInstance(express).selectNodes(fileToElement(file));

}catch (Exception e) { }
return false;
}

public static Document fileToDocument(File file) throws JDOMException {
try {
document = new SAXBuilder().build(readFile(file));
return document;
} catch (JDOMException e) {
throw e;
} catch (IOException e) {
throw new JDOMException("Can't find ["+file.getPath()+"]file !");
}
}
@SuppressWarnings("unchecked")
public static List queryToElementList(File file, String express)
throws JDOMException {
return XPath.newInstance(express).selectNodes(fileToElement(file));
}
public static Element fileToElement(File file) throws JDOMException{
return fileToDocument(file).getRootElement();
}
@SuppressWarnings("unchecked")
public static List fileToElementList(File file)
throws JDOMException {
return fileToElement(file).getChildren();
} public static List> queryToMapList(File file,
String express) throws JDOMException {
return elementToMap(queryToElementList(file, express));
} @SuppressWarnings("unchecked")
public static List> elementToMap(
List elementList) {
List> list = new ArrayList>();
for (Element element : elementList) {
List listElement = element.getChildren();
for (Element element2 : listElement) {
Map map = new HashMap();
map.put(element2.getName(), element2.getText());
list.add(map);
}
}
return list;
}
public static boolean documentToFile(Document document, File tagFile) {
try {
new XMLOutputter().output(document, new FileOutputStream(tagFile));
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
} public static void main(String[] args) {

}}

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