BBS留言板

package org.domxml; import org.bean.*; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.w3c.dom.Text; import java.util.ArrayList; import java.util.Iterator; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerConfigurationException; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; public class NoteDom { Document doc; public NoteDom() { doc = PublicDom.getDoc(File.getUrl("Note.xml")); } // 查询所有记录 public ArrayList selectAll() { ArrayList list = new ArrayList(); NoteBean nb = null; NodeList nList = doc.getElementsByTagName("note"); for (int i = 0; i < nList.getLength(); i++) { Element element = (Element) nList.item(i); String id = element.getElementsByTagName("id").item(0) .getFirstChild().getNodeValue(); String title = element.getElementsByTagName("title").item(0) .getFirstChild().getNodeValue(); String author = element.getElementsByTagName("author").item(0) .getFirstChild().getNodeValue(); String matter = element.getElementsByTagName("matter").item(0) .getFirstChild().getNodeValue(); nb = new NoteBean(Integer.parseInt(id), title, author, matter); list.add(nb); } return list; } // 插入记录 public boolean insert(NoteBean nb) { Element note = doc.createElement("note"); Element id = doc.createElement("id"); Element title = doc.createElement("title"); Element author = doc.createElement("author"); Element matter = doc.createElement("matter"); Element root = doc.getDocumentElement();// 获得跟节点notes NodeList nlist = root.getElementsByTagName("note"); String idvalue = null; for (int i = 0; i < nlist.getLength(); i++) { Element element = (Element) nlist.item(i); NodeList ids = element.getElementsByTagName("id"); idvalue = ids.item(0).getFirstChild().getNodeValue(); } Text t_id = doc.createTextNode("" + (Integer.parseInt(idvalue) + 1)); Text t_title = doc.createTextNode(nb.getTitle()); Text t_author = doc.createTextNode(nb.getAuthor()); Text t_matter = doc.createTextNode(nb.getMatter()); id.appendChild(t_id); title.appendChild(t_title); author.appendChild(t_author); matter.appendChild(t_matter); note.appendChild(id); note.appendChild(title); note.appendChild(author); note.appendChild(matter); Node node = root.appendChild(note); PublicDom.getTrans(doc); return node != null ? true : false; } // 更新记录 public boolean update(NoteBean nb) { Element root = doc.getDocumentElement(); NodeList nodeList = root.getElementsByTagName("note"); NodeList nlist = doc.getElementsByTagName("note"); for (int i = 0; i < nlist.getLength(); i++) { Element element = (Element) nlist.item(i); String id = element.getElementsByTagName("id").item(0) .getFirstChild().getNodeValue(); if (id.equals(new Integer(nb.getId()).toString())) { element.getElementsByTagName("title").item(0).getFirstChild() .setNodeValue(nb.getTitle()); element.getElementsByTagName("author").item(0).getFirstChild() .setNodeValue(nb.getAuthor()); element.getElementsByTagName("matter").item(0).getFirstChild() .setNodeValue(nb.getMatter()); PublicDom.getTrans(doc); return true; } } return false; } // 删除记录 public boolean delete(NoteBean nb) { Element root = doc.getDocumentElement(); NodeList nodeList = root.getElementsByTagName("note"); NodeList nlist = doc.getElementsByTagName("note"); for (int i = 0; i < nlist.getLength(); i++) { Element element = (Element) nlist.item(i); String id = element.getElementsByTagName("id").item(0) .getFirstChild().getNodeValue(); if (id.equals(new Integer(nb.getId()).toString())) { Node node = root.removeChild(nodeList.item(i)); PublicDom.getTrans(doc); return true; } } return false; } // 根据id查找所有记录 public NoteBean select(NoteBean nb) { NodeList nList = doc.getElementsByTagName("note"); for (int i = 0; i < nList.getLength(); i++) { Element element = (Element) nList.item(i); String id = element.getElementsByTagName("id").item(0) .getFirstChild().getNodeValue(); if (id.equals(new Integer(nb.getId()).toString())) { String title = element.getElementsByTagName("title").item(0) .getFirstChild().getNodeValue(); String author = element.getElementsByTagName("author").item(0) .getFirstChild().getNodeValue(); String matter = element.getElementsByTagName("matter").item(0) .getFirstChild().getNodeValue(); NoteBean nbs = new NoteBean(Integer.parseInt(id), title, author, matter); return nbs; } } return null; } // 根据关键字查找所有记录 public ArrayList select(String key) { ArrayList list = new ArrayList(); NodeList nList = doc.getElementsByTagName("note"); for (int i = 0; i < nList.getLength(); i++) { Element element = (Element) nList.item(i); String id = element.getElementsByTagName("id").item(0) .getFirstChild().getNodeValue(); String title = element.getElementsByTagName("title").item(0) .getFirstChild().getNodeValue(); String author = element.getElementsByTagName("author").item(0) .getFirstChild().getNodeValue(); String matter = element.getElementsByTagName("matter").item(0) .getFirstChild().getNodeValue(); boolean is_title = getKey(title, key); boolean is_author = getKey(author, key); boolean is_matter = getKey(matter, key); if (is_title || is_author || is_matter) { NoteBean nbean = new NoteBean(title, author, matter); list.add(nbean); } } return list; } public static boolean getKey(String st, String key) { char[] list = st.toCharArray(); for (int i = 0; i < list.length; i++) { if (Character.toString(list[i]).equals(key)) { return true; } } return false; } }