包括生成xml文件，增加删除修改节点，增加修改属性等等。
现把我的程序共享，还有我的测试例子，看看大家有什么更好的建议。
其中用到了jdom.jar 和xerces-1.2.2.jar ，都是标准的xml解析包。
可以从网上下载。
/**
* $RCSfile: XMLProperty.java,v $
* $Revision: 1.3 $
* $Date: 2002/04/02 21:17:09 $
*
* Copyright (C) 1999-2001 CoolServlets, Inc. All rights reserved.
*
* This software is the proprietary information of CoolServlets, Inc.
* Use is subject to license terms.
*/
package crm.bean.common;
import java.io.*;
import java.util.*;
import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;
import org.xml.sax.*;
/**
* Provides the the ability to use simple XML property files. Each property is
* in the form X.Y.Z, which would map to an XML snippet of:
*
*
*
*
someValue *
*
*
*
* The XML file is passed in to the constructor and must be readable and
* writtable. Setting property values will automatically persist those value
* to disk.
*/
public class XMLProperty {
private String xfile = null;
private File file;
private Document doc;
private String PGID="XMLProperty.java";
/**
* Parsing the XML file every time we need a property is slow. Therefore,
* we use a Map to cache property values that are accessed more than once.
*/
private Map propertyCache = new HashMap();
/**
* Creates a new XMLProperty object.
*
* @param file the full path the file that properties should be read from
* and written to.
*/
public XMLProperty(String file)
{
this.file = new File(file);
this.xfile = file;
try
{
SAXBuilder builder = new SAXBuilder();
doc = builder.build(new File(file));
}
catch (Exception e)
{
System.err.println("Error creating XML parser in " + PGID);
e.printStackTrace();
}
//
}
public XMLProperty(Document doc)
{
this.doc=doc;
}
public Document getDocument()
{
return this.doc;
}
/**
* Return all children property names of a parent property as a String array,
* or an empty array if the if there are no children. For example, given
* the properties X.Y.A, X.Y.B, and X.Y.C, then
* the child properties of X.Y are A, B, and
* C.
*
* @param parent the name of the parent property.
* @return all child property values for the given parent.
*/
public String [] getChildrenProperties(String parent) {
String[] propName = parsePropertyName(parent);
// Search for this property by traversing down the XML heirarchy.
Element element = doc.getRootElement();
for (int i = 0; i < propName.length; i++) {
element = element.getChild(propName[i]);
if (element == null) {
// This node doesn't match this part of the property name which
// indicates this property doesn't exist so return empty array.
return new String [] { };
}
}
// We found matching property, return names of children.
List children = element.getChildren();
int childCount = children.size();
String [] childrenNames = new String[childCount];
for (int i=0; i childrenNames[i] = ((Element)children.get(i)).getName(); } return childrenNames; } //qiuss 2001.11.08 public List getChildren(String name) { String[] propName = parsePropertyName(name); // Search for this property by traversing down the XML heirarchy. Element element = doc.getRootElement(); if(propName!=null) { // qiuss for (int i = 0; i < propName.length; i++) { element = element.getChild(propName[i]); if (element == null) { // This node doesn't match this part of the property name which // indicates this property doesn't exist so return null. return null; } } } // We found matching property, return names of children. return(element.getChildren()); } /** *@param element element==null start from root *@param name name==null return this element's value *@author qiuss *@date 2001.11.08 */ public String getProperty(Element element,String name) { if (propertyCache.containsKey(name)) { return (String)propertyCache.get(name); } String[] propName = parsePropertyName(name); // Search for this property by traversing down the XML heirarchy. if(element==null) //from rootElement when element equals null element = doc.getRootElement(); if(propName!=null) { for (int i = 0; i < propName.length; i++) { element = element.getChild(propName[i]); if (element == null) { // This node doesn't match this part of the property name which // indicates this property doesn't exist so return null. return null; } } } // At this point, we found a matching property, so return its value. // Empty strings are returned as null. String value = element.getText(); if ("".equals(value)) { return null; } else { value = value.trim(); propertyCache.put(name, value); return value; } } /** * Returns the value of the specified property. * @param name the name of the property to get. * @return the value of the specified property. */ public String getProperty(String name) { return getProperty(null,name); } /** *@param element element==null start from root *@param name child's element name eg. X.Y.Z *@param attName attribute name eg. "abc=1234" if attName==null get first element *@return searched element *@author qiuss *@date 2001.11.08 */ public Element getChild(Element element,String name,String attName) { //if(name==null) return element; String[] propName = parsePropertyName(name); String[] attrName = parseAttributeName(attName); // Search for this property by traversing down the XML heirarchy. if(element==null) element = doc.getRootElement(); if(propName!=null) { // qiuss for (int i = 0; i < propName.length; i++) { element = element.getChild(propName[i]); if (element == null) { // This node doesn't match this part of the property name which // indicates this property doesn't exist so return null. return null; } } } // We found matching property, return names of children. List eList=element.getChildren(); if(attrName==null) return (Element)eList.get(0); Iterator it=eList.iterator(); while(it.hasNext()){ Attribute att; Element ele=(Element)it.next(); if((att=ele.getAttribute(attrName[0]))!=null) { if(att.getValue().equals(attrName[1])) return ele; } } return null; } /** * 设置一个元素值。如果指定的元素不存在，就自动创建该元素。 * * @param name 需要赋值的元素名称，格式为 X.Y.Z * @param value 元素值 * * @throws IOException */ public void setProperty(String name, String value) { propertyCache.put(name, value); //查找指定的元素元素 Element element = this.findCreate(name); element.setText(value); saveProperties(); } /** * 设置一个元素的Attribute值。如果指定的元素不存在，就自动创建该元素。 * * @param name 需要赋值的元素名称，格式为 X.Y.Z * @param attr Attribute名称 * @param value 元素值 * * @throws IOException */ public void setProperty(String name, String attr, String value) { String nameAttr = name + ":" + attr; propertyCache.put(nameAttr, value); //查找指定的元素元素 Element element = this.findCreate(name); element.setAttribute(attr, value); saveProperties(); } /** * helper方法，查找一个指定的元素,如果这个元素不存在，创建它 * * @param name 元素名称，格式为 X.Y.Z * @return Element 找到就返回这个元素，否则返回创建的新元素 */ private Element findCreate(String name) { //分解元素的名称 String[] propName = parsePropertyName(name); Element element = doc.getRootElement(); //遍历搜索匹配的元素，不存在则创建它 for (int i = 0; i < propName.length; i++) { if(element.getChild(propName[i]) == null) { //自动创建该元素 element.addContent(new Element(propName[i])); } element = element.getChild(propName[i]); } //找到啦！ return element; } /** * 删除指定的元素，如果该元素不存在，不做任何事情 * * @param name 要删除的元素的名称，格式为 X.Y.Z * */ public void deleteProperty(String name) { if(propertyCache.containsKey(name)) propertyCache.remove(name); Element element = this.findOnly(name); if(element != null) element.detach(); saveProperties(); } /** * 删除指定的元素的Attribute，如果该元素或者Attribute不存在，不做任何事情 * * @param name 元素的名称，格式为 X.Y.Z * @param attr Attribute的名称 * * @throws IOException */ public void deleteProperty(String name, String attr) throws IOException { String nameAttr = name + ":" + attr; if(propertyCache.containsKey(nameAttr)) propertyCache.remove(nameAttr); Element element = this.findOnly(name); if(element != null) element.removeAttribute(attr); saveProperties(); }