Written in December October 13, 2014: Modify and add XML elements

package haha;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.util.Iterator;import java.util.List;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;public class ModiXmlFile {    private String filename;    private SAXReader saxReader;    private Document document;    ModiXmlFile(String _filename) {    this.filename = _filename;    saxReader = new SAXReader();    try {        document = saxReader.read(filename);    } catch (DocumentException e) {        System.err.println("获取 [" + filename            + "]文档时,发生了错误");    }    }    /**     * 在所有的二级元素下添加元素，若已有则不填加。     * @param nodeName 元素名     * @param initValue 初始值     * @return 若添加了元素，返回true。没有添加返回false     */    @SuppressWarnings("unchecked")    public Boolean addNode(String nodeName, String initValue) {    Element root = document.getRootElement();    List<Element> elements = root.elements();    Iterator<Element> it = elements.iterator();    Element tempElement;    Boolean result=false;    while (it.hasNext()) {        tempElement=it.next();        if (tempElement.element(nodeName)==null) {        tempElement.addElement(nodeName).setText(initValue);        result=true;        }    }    if (result) {        if (fflush())            return true;        else            return false;    }    else {        return false;    }    }/** * 根据所给的id，修改第id个二级元素拥有的指定元素的值 * @param id 二级元素的次序 * @param nodeName 指定元素的名字 * @param value 值 * @return 修改成功或失败(没有此元素); */    @SuppressWarnings("unchecked")    public Boolean setNodeValue(Integer id, String nodeName, String value) {    Element root = document.getRootElement();    List<Element> elements = root.elements();    Iterator<Element> it = elements.iterator();    boolean result=false;    Element tempElement;    while (it.hasNext()) {        tempElement=it.next();        if (--id!=0) {        continue;        }        if (tempElement==null) {        System.err.println("没有此节点");        return false;        }        tempElement.element(nodeName).setText(value);        result=true;        break;    }    if (!result) {        System.err.println("指定的次序超过了总二级元素个数");        return false;    }    else if (fflush()) {        return true;    }    else {        return false;    }    }    private Boolean fflush() {    XMLWriter output;    try {        output = new XMLWriter(new FileWriter(new File(filename)));        output.write(document);        output.close();    } catch (IOException e) {        System.err.println("打开 [" + filename + "],发生了错误");        return false;    }    return true;    }}

 

Written in December October 13, 2014: Modify and add XML elements