/**
 * helper方法，查找一个指定的元素
 *
 * @param name 元素名称，格式为 X.Y.Z
 * @return Element 如果找到就返回这个元素，否则返回null
 */
public Element findOnly(String name)
{
//分解元素的名称
String[] propName = parsePropertyName(name);
Element element = this.doc.getRootElement();
//遍历搜索匹配的元素
for (int i = 0; i < propName.length; i++)
{
element = element.getChild(propName[i]);
if(element == null) return null;
}
//找到啦！
return element;
}
/**
 * Saves the properties to disk as an XML document. A temporary file is
 * used during the writing process for maximum safety.
 */
public synchronized void saveProperties() {
OutputStream out = null;
boolean error = false;
// Write data out to a temporary file first.
File tempFile = null;
try {
tempFile = new File(file.getParentFile(), file.getName() + ".tmp");
// Use JDOM's XMLOutputter to do the writing and formatting. The
// file should always come out pretty-printed.
//增加此行使得支持中文wyl 20021015
XMLOutputter outputter = new XMLOutputter("", true,"GB2312");
out = new BufferedOutputStream(new FileOutputStream(tempFile));
//增加此行，使得xml文件没有空行。 wyl 20021030
outputter.setTextNormalize(true);
outputter.output(doc, out);
}
catch (Exception e) {
e.printStackTrace();
// There were errors so abort replacing the old property file.
error = true;
}
finally {
try {out.close();}
catch (Exception e) {
e.printStackTrace();
error = true;
}
}
// No errors occured, so we should be safe in replacing the old
if (!error) {
// Delete the old file so we can replace it.
if (!file.delete()) {
System.err.println("Error deleting property file: " +
file.getAbsolutePath());
return;
}
// Rename the temp file. The delete and rename won't be an
// automic operation, but we should be pretty safe in general.
// At the very least, the temp file should remain in some form.
if (!tempFile.renameTo(file)) {
System.err.println("Error renaming temp file from " +
tempFile.getAbsolutePath() + " to " + file.getAbsolutePath());
}
}
}
 /**
 * Returns an array representation of the given crm property. crm
 * properties are always in the format "prop.name.is.this" which would be
 * represented as an array of four Strings.
 *
 * @param name the name of the crm property.
 * @return an array representation of the given crm property.
 */
public String[] parsePropertyName(String name) {
// Figure out the number of parts of the name (this becomes the size
// of the resulting array).
int size = 1;
for (int i=0; i<name.length(); i++) {
if (name.charAt(i) == '.') {
size++;
}
}
String[] propName = new String[size];
// Use a StringTokenizer to tokenize the property name.
StringTokenizer tokenizer = new StringTokenizer(name, ".");
int i = 0;
while (tokenizer.hasMoreTokens()) {
propName[i] = tokenizer.nextToken();
i++;
}
return propName;
}
private String[] parseAttributeName(String name)
{
// Figure out the number of parts of the name (this becomes the size
// of the resulting array).
if(name==null) return null;

int size = 1;
for (int i=0; i<name.length(); i++)
{
if (name.charAt(i) == '=')
{
size++;
}
}
if(size!=2) return null;
String[] attrName = new String[size];
// Use a StringTokenizer to tokenize the property name.
StringTokenizer tokenizer = new StringTokenizer(name, "=");
for(int i=0;tokenizer.hasMoreTokens();i++)
attrName[i] = tokenizer.nextToken();
return attrName;
 }
/**
*@param element element==null start from root
*@param attName attribute name
*@return attribute value of this element
*@author qiuss
*@date 2001.11.08
*/

public String getAttribute(Element element,String attName)
{
if(attName==null) return null;
// Search for this property by traversing down the XML heirarchy.
if(element==null) element = doc.getRootElement();
Attribute att;
String value;
if((att=element.getAttribute(attName))!=null)
value = att.getValue();
else
return null;
if ("".equals(value))
{
return null;
}
else
{
return value.trim();
}
} 
// qiuss 2001.11.08

public String getAttribute(String eleName,String attName)
{
String[] propName = parsePropertyName(eleName);
// 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 null.
return null;
}
}
// At this point, we found a matching property, so return its value.
// Empty strings are returned as null.
String value ="";
try{
value= element.getAttribute(attName).getValue();
}
catch(Exception e)
{
value ="";
}
if ("".equals(value))
{
return "";
}
else
{
return value.trim();
}
}
public static void main(String[] args)
{
XMLProperty xmltree = new XMLProperty("D:/project/bicp-ivr/crm_config.xml");
//存在则更改元素的属性值
xmltree.setProperty("system.connection.username2","type","中文测试");
//不存在则新建一个元素
xmltree.setProperty("system.connection.用户名称","ecom4");
xmltree.setProperty("system.connection.用户名称","type","中文测试2222");
//删除一个xml
//xmltree.deleteProperty("system.connection.username2");
String db_url= xmltree.getProperty("system.connection.db_url");
String db_url_id="";
db_url_id=xmltree.getAttribute("system.information.db_url","remark");
Debug.println("db_url="+db_url);
Debug.println("db_url_id="+db_url_id);
//String names[] = xmltree.parsePropertyName("style.body");
//for(int i=0;i<names.length;i++)
//{
//Debug.println("i="+i+" "+names[i]);
//}
String child[] = xmltree.getChildrenProperties("style.body");
for(int j=0;j<child.length;j++)
{
Debug.println("j="+j+" "+child[j]);
String child2[]= xmltree.getChildrenProperties("system.tracelog."+child[j]);
for(int k=0;k<child2.length;k++)
{
Debug.println("k="+k+" "+child2[k]);
}
}

//System.out.println("Hello World!");

}
}