Ajax应用开发综合案例

package com.eamoi.ajax; import java.io.File; import java.io.FileOutputStream; import java.io.PrintWriter; import java.util.*; import org.jdom.*; import org.jdom.input.SAXBuilder; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; public class BlogService { private Document blogdom; private Document listdom; /** * 构造函数，初始化DOM连接 * */ public BlogService() { try { SAXBuilder builder = new SAXBuilder(); this.blogdom = builder.build(BlogService.class.getResource("blog.xml")); this.listdom = builder.build(BlogService.class.getResource("list.xml")); }catch(Exception ex) { this.handleError(ex); } } /** * 获取日志列表，以对象数组的形式返回，用于显示，不包含评论和引用 * @return */ public Blog[] getAllBlog() { Collection bloges = new ArrayList(); if(this.blogdom.getRootElement().getChildren().size()!=0) { Iterator iterator = this.blogdom.getRootElement().getChildren().iterator(); do { Element element = (Element)iterator.next(); Blog blog = new Blog(element); bloges.add(blog); }while(iterator.hasNext()); return (Blog[])bloges.toArray(new Blog[0]); } else return new Blog[0]; } /** * 获取日志列表，以Map的形式返回，用户持久化，包含评论和引用 * @return */ public Map getAllBlogMap() { Map bloges = new HashMap(); if(this.blogdom.getRootElement().getChildren().size()!=0) { Iterator iterator = this.blogdom.getRootElement().getChildren().iterator(); do { Element element = (Element)iterator.next(); Blog blog = new Blog(); blog.initialBlog(element); bloges.put(blog.getId(),blog); }while(iterator.hasNext()); } return bloges; } /** * 获取指定的日志，包含其评论和引用 * @param id * @return */ public Blog getBlog(String id) { Blog blog = null; if(this.blogdom.getRootElement().getChildren().size()!=0) { Iterator iterator = this.blogdom.getRootElement().getChildren().iterator(); do { Element element = (Element)iterator.next(); if(element.getAttributeValue("id").equalsIgnoreCase(id)){ blog = new Blog(); blog.initialBlog(element); } }while(iterator.hasNext()); } return blog; } /** * 增加日志 * @param blog * @throws Exception */ public void addBlog(Blog blog) throws Exception { Map bloges = this.getAllBlogMap(); blog.setId(String.valueOf(bloges.size())); bloges.put(blog.getId(),blog); this.outputXMLDocument((Blog[])bloges.values().toArray(new Blog[0])); } /** * 获取指定日志的评论列表，以对象数组的形式返回 * @param blogid * @return */ public BlogComment[] getComment(String blogid) { Collection commentes = new ArrayList(); if(this.blogdom.getRootElement().getChildren().size()!=0) { Iterator iterator = this.blogdom.getRootElement().getChildren().iterator(); do { Element element = (Element)iterator.next(); if(element.getAttributeValue("id").equalsIgnoreCase(blogid)) { if(element.getChild("comments").getChildren().size()!=0) { Iterator cIterator = element.getChild("comments").getChildren().iterator(); do { Element cElement = (Element)cIterator.next(); BlogComment comment = new BlogComment(cElement); commentes.add(comment); }while(cIterator.hasNext()); } } }while(iterator.hasNext()); } return (BlogComment[])commentes.toArray(new BlogComment[0]); } /** * 获取指定日志的评论列表，以Map对象的形式返回 * @param blogid * @return * @throws Exception */ public Map getCommentMap(String blogid) throws Exception { Map comments = new HashMap(); if(this.blogdom.getRootElement().getChildren().size()!=0) { Iterator iterator = this.blogdom.getRootElement().getChildren().iterator(); do { Element element = (Element)iterator.next(); if(element.getAttributeValue("id").equalsIgnoreCase(blogid)) { if(element.getChild("comments").getChildren().size()!=0) { Iterator cIterator = element.getChild("comments").getChildren().iterator(); do { Element cElement = (Element)cIterator.next(); BlogComment comment = new BlogComment(cElement); comments.put(comment.getCommentdate(),comment); }while(cIterator.hasNext()); } } }while(iterator.hasNext()); } return comments; } /** * 添加指定日志的评论 * @param comment * @param blogid * @throws Exception */ public void addComment(BlogComment comment, String blogid) throws Exception { Map bloges= this.getAllBlogMap(); if((bloges!=null)&&(bloges.size()!=0)) { Blog[] bArray = (Blog[])bloges.values().toArray(new Blog[0]); for(int i=0;i<bArray.length;i++) { if(blogid.equalsIgnoreCase(bArray[i].getId())) { bArray[i].addComment(comment); break; } } this.outputXMLDocument(bArray); } else throw new Exception("未找到指定日志。"); } /** * 获取指定日志的引用列表，以对象数组的形式返回 * @param blogid * @return */ public BlogReference[] getReference(String blogid) { Collection references = new ArrayList(); if(this.blogdom.getRootElement().getChildren().size()!=0) { Iterator iterator = this.blogdom.getRootElement().getChildren().iterator(); do { Element element = (Element)iterator.next(); if(element.getAttributeValue("id").equalsIgnoreCase(blogid)) { if(element.getChild("references").getChildren().size()!=0) { Iterator cIterator = element.getChild("references").getChildren().iterator(); do { Element cElement = (Element)cIterator.next(); BlogReference reference = new BlogReference(cElement); references.add(reference); }while(cIterator.hasNext()); } } }while(iterator.hasNext()); } return (BlogReference[])references.toArray(new BlogReference[0]); } /** * 将日志输出为持久化的XML文档 * @param bloges * @throws Exception */ public void outputXMLDocument(Blog[] bloges) throws Exception { File file = new File(BlogService.class.getResource("blog.xml").getPath()); if(file.exists()) file.delete(); if(!file.exists()) file.createNewFile(); FileOutputStream stream = new FileOutputStream(file); Document doc = new Document(); Element root = new Element("bloges"); if((bloges!=null)&&(bloges.length!=0)) { for(int i=0;i<bloges.length;i++) { Element element = new Element("blog"); element.setAttribute("id",bloges[i].getId()); Element title = new Element("title").addContent(bloges[i].getTitle()); Element catalogue = new Element("catalogue").addContent(bloges[i].getCatalogue()); Element publishdate = new Element("publishdate").addContent(bloges[i].getPublishdate()); CDATA conCDATA = new CDATA(bloges[i].getContent()); Element content = new Element("content").addContent(conCDATA); Element entry = new Element("entry").addContent(bloges[i].getEntry()); Element track = new Element("track").addContent(bloges[i].getTrack()); Element images = new Element("images"); if((bloges[i].getImages()!=null)&&(bloges[i].getImages().size()!=0)) { BlogImage[] iArray = (BlogImage[])bloges[i].getImages().toArray(new BlogImage[0]); for(int j=0;j<iArray.length;j++) { Element image = new Element("image"); image.addContent(new Element("imageName").addContent(iArray[j].getImageName())); image.addContent(new Element("url").addContent(iArray[j].getUrl())); images.addContent(image); } } Element comments = new Element("comments"); BlogComment[] cArray = (BlogComment[])bloges[i].getComments().toArray(new BlogComment[0]); if((cArray!=null)&&(cArray.length!=0)) { for(int j=0;j<cArray.length;j++) { Element comment = new Element("comment"); comment.addContent(new Element("author").addContent(cArray[j].getAuthor())); comment.addContent(new Element("blogimage").addCon