Android-XML
XML文件：
<?xml version="1.0" encoding="utf-8"?>
<books>
<book id="1">
<name>C# 入门经典</name>
<price>10</price>
<des>Good</des>
</book>
<book id="2">
<name>C# 高级编程</name>
<price>20</price>
<des>Good</des>
</book>
<book id="3">
<name>Android 第一行代码</name>
<price>30</price>
<des>Good</des>
</book>
</books>
1.PULL解析器
(1)解析XML
public static List<Ben_Book> decodeXMLByPULL(InputStream inputStream) {
List<Ben_Book> list = null;
Ben_Book book = null;
//1.创建XmlPUlParser实例
XmlPullParser parser = Xml.newPullParser();
try {
//2.设置数据流，指明编码方式
parser.setInput(inputStream, "utf-8");
//3.获取事件类型
int eventType = parser.getEventType();
//4.判断事件类型，只要不是文档结束，就继续解析
while (parser.getEventType() != XmlPullParser.END_DOCUMENT) {
switch (eventType) {
case XmlPullParser.START_DOCUMENT: //文档开始位置
list = new ArrayList<>();
break;
case XmlPullParser.START_TAG: //标签开始
String name = parser.getName();
if (name.equals("book")) {
book = new Ben_Book();
String id= parser.getAttributeValue(0); //获取属性值
book.setId(id);
} else if (name.equals("name")) {
book.setName(parser.nextText().toString()); //获取节点内容
} else if (name.equals("price")) {
book.setPrice(parser.nextText().toString());
} else if (name.equals("des")) {
book.setDes(parser.nextText().toString());
}
break;
case XmlPullParser.END_TAG: //标签结束
list.add(book); //book 添加到集合当中
book = null;
break;
case XmlPullParser.END_DOCUMENT: //文档结束
break;
}
eventType = parser.next(); //解析下一个事件
}
} catch (Exception e) {
e.printStackTrace();
}
return list;
}
(2)生成XML文件
public String writeXML(List<Book> list) throws XmlPullParserException, IOException {
XmlSerializer serializer = XmlPullParserFactory.newInstance().newSerializer();
StringWriter sw = new StringWriter();
serializer.setOutput(sw);
serializer.startDocument("utf-8", true);
serializer.startTag("", "books"); //根节点
for (Book book : list) {
serializer.startTag("", "book"); //*******//
serializer.attribute("", "id", book.getId());
serializer.startTag("", "name");
serializer.text(book.getName());
serializer.endTag("", "name");
serializer.startTag("", "price");
serializer.text(book.getPrice());
serializer.endTag("", "price");
serializer.startTag("", "des");
serializer.text(book.getDescription());
serializer.endTag("", "des");
serializer.endTag("","book"); //********//
}
serializer.endTag("", "books");
serializer.endDocument();
String xml = sw.toString();
System.out.println(xml);
return xml;
}
2.DOM解析器
（1）解析
public static List<Ben_Book> decodeXMLByDOM(InputStream inputStream) {
List<Ben_Book> list = new ArrayList<>();
Ben_Book book;
try {
//1.获得DOM解析器的工厂示例:
//DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
//2.从Dom工厂中获得dom解析器
//DocumentBuilder dbBuilder = dbFactory.newDocumentBuilder();
//3.xml数据流读入Dom解析器
//Document doc = dbBuilder.parse(inputStream);
//或者可以一步到位
Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(is);
//4.得到文档中名称为book的元素的结点列表
NodeList nList = doc.getElementsByTagName("book");
//5.遍历该集合,显示集合中的元素以及子元素的名字
for (int i = 0; i < nList.getLength(); i++) {
//先从book元素开始解析
Element bookElement = (Element) nList.item(i);
book = new Ben_Book();
book.setId(bookElement.getAttribute("id")); //获取属性值
//获取book下的name,price,des
NodeList childNoList = bookElement.getChildNodes();
for (int j = 0; j < childNoList.getLength(); j++) {
Node childNode = childNoList.item(j);
//判断子note类型是否为元素Note
if (childNode.getNodeType() == Node.ELEMENT_NODE) {
Element childElement = (Element) childNode;
if ("name".equals(childElement.getNodeName()))
book.setName(childElement.getFirstChild().getNodeValue());
else if ("price".equals(childElement.getNodeName()))
book.setPrice(childElement.getFirstChild().getNodeValue());
else if ("des".equals(childElement.getNodeName()))
book.setDes((childElement.getFirstChild().getNodeValue()));
}
}
list.add(book);
}
} catch (Exception e) {
e.printStackTrace();
}
return list;
}