dw做asp购物网站/b2b平台是什么意思
vaniglia 是一个开源的java工具库，下的版本大概1.7万，学习一下。
一. XML文件操作
封装org.w3c.dom.* 工具类，主要提供下面几个方法：
- public synchronized final Document getDocument(String fileName) 将xml文件转换为Document对象；
- public final void storeDocumentToFile(Document document, String fileName) 把Document对象转换成文件；
- public XMLUtilities() 初始化documentBuilder:
public XMLUtilities() {DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();dbf.setNamespaceAware(true);dbf.setValidating(false);dbf.setIgnoringComments(true);try {db = dbf.newDocumentBuilder();} catch (ParserConfigurationException e) {logger.fatal("Unable to create a DocumentBuilder");System.exit(-1);}db.setErrorHandler(errorHandler);}注:在xml文件中如果出现异常的空格、换行，可能导致#text的错误节点。
二.TextTable 支持在控制台打印一个表
效果如下：
Non Adaptive Text Tablename address zip
------------------------------------pippo via due 100 aa diecicarat 2 via qualtu 8 noadr 188 bbb piudidiecicaratterid 20 cccc this element has not 100 pluto this element has not 130 ffff this element has not 10 代码实现主要是TextTable，该类的两个主要方法分别是columns和elements，一个存储列信息，一个存储表内的元素
public class TextTable {//略private TableColumn[] columns; //列信息private Vector elements; //表内的元素其中TableColume中包含，它只是列的定义信息，本身并不包含数据。数据在elements中。
public class TableColumn {private String name = "";private int minWidth;private int width;private Align alignment; //当前只支持三列，即左、中、右三.对TextTable的操作如下：
public class App {public static void main(String[] args) {{System.out.println("Non Adaptive Text Table");System.out.println();TextTable table = new TextTable(new TableColumn[] {new TableColumn("name", 5, Align.CENTER),new TableColumn("address", 20, Align.LEFT),new TableColumn("zip", 3, Align.RIGHT)},2, false);table.addElement(new String[] {"pippo", "via due", "100"});table.addElement(new String[] {"aa", "diecicarat", "2"});table.addElement(new String[] {"", "via qualtu", "8"});table.addElement(new String[] {"noadr", "", "1888"});table.addElement(new String[] {"bbb", "piudidiecicaratteridisicuro", "20"});table.print(System.out);三.模板引擎，类似于jsp、struts2中的变量标签，如下例：
public static void main(String[] args) throws IOException {String template = "<html><head><title>$title</title></head>\n"+"<body style=\"background-color: rgb(202, 227, 255); visibility: visible;\">\n"+"<b>Dear $name</b>\n"+"<p>\n"+"how is going? Is a long time we don't see. Last time was $lasttime\n"+"I hope you can join us for my party that is scheduled for $party.\n"+"</p>\n"+"<p>\n"+"Best Regards,<br/>\n"+" <i>Michele</i>\n"+"</body></html>\n";ContextMap context = new ContextMap();context.put("title", "Page Title");context.put("name", "Luca");context.put("lasttime", "10/05/2005");context.put("party", "20/07/2005");context.put("static", "TemplateEngine.merge static");TemplateEngine templateEngine = new TemplateEngine(template);templateEngine.merge(context, new PrintWriter(System.out));上例中$打头的变量将会被新的字符串替换，该特性实现主要分以下几个部分：
1. 定义一个ContextMap,维护一个hash表记录字符串和被替换字符串的映射关系；
2. 实现核心类TemplateEngine，其中重要的是：
- 成员ReferenceElement[] references，记录每个替换引用的值和在模板中的位置
- init方法，在构造函数时被调用，遍历模板并记录相应的替换项至references；
- merge方法，业务方法，遍历模板并将ContextMap中值替换到references中去；
int tokenEnd = findTokenEndIndex(template, tokenBegin+1);String key = template.substring(tokenBegin+1, tokenEnd);
String value = context.get(key);
if (value != null) {writer.write(value);
}
else {writer.write(token);writer.write(key);
}
start = tokenEnd; private static int findTokenEndIndex(String template, int startindex) {int currentindex = startindex;char current;while (currentindex < template.length()){current = template.charAt(currentindex);if ((current >= '0' && current <='9') ||(current >= 'A' && current <= 'Z') ||(current >= 'a' && current <= 'z') ||(current == '_') || (current == '-')) {currentindex++;}else {break;}}return currentindex;}