xml总结

DOM4J:
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1、写XML
    public void save() throws Exception {
        OutputFormat format = OutputFormat.createPrettyPrint();
        format.setEncoding("utf-8");
        OutputStream fos = new FileOutputStream(xmlFileName);
        XMLWriter writer = new XMLWriter(fos, format);
        writer.write(xmlDoc);
        writer.close();
    }
2、读取XML
 InputStream is = new FileInputStream(config);//config:xml文件所在的路径
   SAXReader sax=new SAXReader();
   Document doc=sax.read(is); 
   List sourceList = doc.selectNodes("/data-source/source");//xml二级元素
   Iterator iterator = sourceList.iterator();
   while(iterator.hasNext()){
    Element source = (Element)iterator.next();
    DataSourceBean dsBean = new DataSourceBean();
    dsBean.setName(source.elementText("name"));
//    System.out.println(source.elementText("name"));
    dsBean.setUrl(source.elementText("url"));
                         }
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JDOM:
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1、写XML：
 Format format = Format.getCompactFormat();
        format.setEncoding("utf-8");           //设置xml文件的字符为utf-8
        format.setIndent("    ");    //设置xml文件的缩进为4个空格
        XMLOutputter XMLOut = new XMLOutputter(format);
        /*
         * 将doc1中的各个节点及值放入文件fileName2中。
         */
     XMLOut.output(doc1, new FileOutputStream(fileName2));
2、形成DOC：
Element root1=new Element("video");
Document doc1=new Document(root1);//将根元素植入文档doc中
root1.setAttribute("allnum",String.valueOf(i));
遍历一个集合创建N个record节点
Element record =new Element("record");
Element id=new Element("id");
id.setText(modifyString(m.getId()));
record.addContent(id);
。。。
Element  name=new Element("name");
name.setText(modifyString(m.getName()));
record.addContent(name);
root1.addContent(record);
3、读取XML：
SAXBuilder saxBuilder = new SAXBuilder();
org.jdom.Document doc = saxBuilder.build(url);
Element root  = doc.getRootElement();
List allChild = root.getChildren();
Element el = (Element)allChild.get(i);
Element el1 =(Element) el.getChild("keyword");
Element el2 =(Element) el.getChild("path");
String keyword = el1.getText();
String path = el2.getText();
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自制作：
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1、写XML：
public static void writeXml(ImageStore[] ir, int allnum, PrintWriter writer)throws IOException
{
     writer.write("\n");
     if (ir == null || ir.length == 0)
        {
 writer.write("no result");
 return;
        }
    writer.write("\n");
    for (int i = 0; i < ir.length; i++)
        {  
 System.out.println(ir.length+" "+i);
// if (ir[i] == null)
//  continue;
 writer.write("\n");
 writer.write("");
 writer.write(ir[i].getKeyword());
 writer.write("\n");
 writer.write("");
 writer.write(ir[i].getCurrank().toString());
 writer.write("\n");
        writer.write("\n");
        }
  writer.write("\n");
}
2、读取XML：
 public void parse(String content) {
  int start, end;
  start = content.indexOf("allnum=");
  if (start == -1) {
   allnum = 0;
  }else {
   allnum = Integer.parseInt(content.substring(start + 8, content.indexOf("'", start + 8)));
  }
  //首先根据头文件确定循环次数
  String[] records = parseTag(content, _RECORD);
  resultList = new ArrayList();
  for (int i = 0; i < records.length; i++) {
                        //解析出来的内容放到一个数据bean里面去
   SingleGameResult sgr = new SingleGameResult();
   sgr.setShowOrder(i + 1);
   
   String[] items;
   items = parseTag(records[i], _TITLE);
   if ((items != null) && (items.length > 0)) {
    sgr.setTitle(items[0]);
   }
   items = parseTag(records[i], _URL);
   if ((items != null) && (items.length > 0)) {
    sgr.setUrl(items[0]);
   }
   items = parseTag(records[i], _FORMAT);
   if ((items != null) && (items.length > 0)) {
    sgr.setFormat(items[0]);
   }
   items = parseTag(records[i], _SIZE);
                  。。。。。
    
   resultList.add(sgr);
  }
 }
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 public static String[] parseTag(String content, String tag)
 {
  final String _TAG_START = "<" + tag + ">";
  final String _TAG_END = "";

  ArrayList results = new ArrayList();

  int start = content.indexOf(_TAG_START);
  int end = 0;
  while (start >= 0) {
   end = content.indexOf(_TAG_END, start);
   if (end < start) {
    break;
   }

   String item = content.substring(start + _TAG_START.length(), end);
   start = content.indexOf(_TAG_START, end);

   results.add(item);
  }

  return (String[]) results.toArray(new String[0]);
 }
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