xml文件操作的java程序（续）

答案：/**
     * 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;

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