xml文件解析 document对象

时间：2010-07-18 来源：fengbenming

# 一.Document对象相关
#
# 1.读取XML文件,获得document对象.
#             SAXReader reader = new SAXReader();
#             Document document = reader.read(new File("input.xml"));
#
#
# 2.解析XML形式的文本,得到document对象.
#             String text = "<members></members>";
#             Document document = DocumentHelper.parseText(text);
#
# 3.主动创建document对象.
#             Document document = DocumentHelper.createDocument();
#             Element root = document.addElement("members");// 创建根节点
#
# 二. 节点相关
#
# 1. 获取文档的根节点.
# Element rootElm = document.getRootElement();
#
# 2.取得某节点的单个子节点.
# Element memberElm=root.element("member");// "member" 是节点名
#
# 3.取得节点的文字
# String text=memberElm.getText();
# 也可以用:
# String text=root.elementText("name");
# 这个是取得根节点下的name字节点的文字.
#
# 4.取得某节点下名为"member"的所有字节点并进行遍历.
# List nodes = rootElm.elements("member");
#
# for (Iterator it = nodes.iterator(); it.hasNext();) {
#    Element elm = (Element) it.next();
#    // do something
# }
#
# 5.对某节点下的所有子节点进行遍历.
#             for(Iterator it=root.elementIterator();it.hasNext();){
#                 Element element = (Element) it.next();
#                 // do something
#             }
#
# 6.在某节点下添加子节点.
# Element ageElm = newMemberElm.addElement("age");
#
# 7.设置节点文字.
# ageElm.setText("29");
#
# 8.删除某节点.
# parentElm.remove(childElm);// childElm是待删除的节点,parentElm是其父节点
#
# 三. 属性相关.
# 1.取得某节点下的某属性
#             Element root=document.getRootElement();
#             Attribute attribute=root.attribute("size");// 属性名 name
#
# 2.取得属性的文字
#             String text=attribute.getText();
# 也可以用:
# String text2=root.element("name").attributeValue("firstname");
# 这个是取得根节点下name字节点的属性firstname的值.
#
# 3.遍历某节点的所有属性
#             Element root=document.getRootElement();
#             for(Iterator it=root.attributeIterator();it.hasNext();){
#                 Attribute attribute = (Attribute) it.next();
#                 String text=attribute.getText();
#                 System.out.println(text);
#             }
#
# 4.设置某节点的属性和文字.
# newMemberElm.addAttribute("name", "sitinspring");
#
# 5.设置属性的文字
#             Attribute attribute=root.attribute("name");
#             attribute.setText("sitinspring");
#
# 6.删除某属性
#             Attribute attribute=root.attribute("size");// 属性名 name
#             root.remove(attribute);
#
# 四. 将文档写入XML文件.
# 1.文档中全为英文,不设置编码,直接写入的形式.
# XMLWriter writer = new XMLWriter(new FileWriter("output.xml"));
# writer.write(document);
# writer.close();
#
# 2.文档中含有中文,设置编码格式写入的形式.
#             OutputFormat format = OutputFormat.createPrettyPrint();
#             format.setEncoding("GBK");    // 指定XML编码
#             XMLWriter writer = new XMLWriter(new FileWriter("output.xml"),format);
#
#             writer.write(document);
#             writer.close();
#
# 五. 字符串与XML的转换
# 1.将字符串转化为XML
# String text = "<members> <member>sitinspring</member> </members>";
# Document document = DocumentHelper.parseText(text);
#
# 2.将文档或节点的XML转化为字符串.
#             SAXReader reader = new SAXReader();
#             Document document = reader.read(new File("input.xml"));
#             Element root=document.getRootElement();
#             String docXmlText=document.asXML();
#             String rootXmlText=root.asXML();
#             Element memberElm=root.element("member");
#             String memberXmlText=memberElm.asXML();
#
# 六. 使用XPath快速找到节点.
# 读取的XML文档示例
# <?xml version="1.0" encoding="UTF-8"?>
# <projectDescription>
#   <name>MemberManagement</name>
#   <comment></comment>
#   <projects>
#     <project>PRJ1</project>
#     <project>PRJ2</project>
#     <project>PRJ3</project>
#     <project>PRJ4</project>
#   </projects>
#   <buildSpec>
#     <buildCommand>
#       <name>org.eclipse.jdt.core.javabuilder</name>
#       <arguments>
#       </arguments>
#     </buildCommand>
#   </buildSpec>
#   <natures>
#     <nature>org.eclipse.jdt.core.javanature</nature>
#   </natures>
# </projectDescription>
#
# 使用XPath快速找到节点project.
# public static void main(String[] args){
#     SAXReader reader = new SAXReader();
#
#     try{
#       Document doc = reader.read(new File("sample.xml"));
#
#       List projects=doc.selectNodes("/projectDescription/projects/project");
#
#       Iterator it=projects.iterator();
#
#       while(it.hasNext()){
#         Element elm=(Element)it.next();
#         System.out.println(elm.getText());
#       }
#
#     }
#     catch(Exception ex){
#        ex.printStackTrace();
#     }
#   }