The first two articles briefly explain the way sax parses xml and implement the parsing function. Next use sax to create the xml file.
Specifically how to use sax to create xml, add relevant comments in the program, or directly enter the code.
package cn.com.sax; import java.io.OutputStream; import java.io.StringWriter; import javax.xml.transform.OutputKeys; import javax.xml.transform.Result; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerConfigurationException; import javax.xml.transform.sax.SAXTransformerFactory; import javax.xml.transform.sax.TransformerHandler; import javax.xml.transform.stream.StreamResult; import org.xml.sax.SAXException; import org.xml.sax.helpers.AttributesImpl; import android.util.Log; class SxaCreateXml { /** * SAX方式生成XML * * @param list * @return */ public String saxToXml(OutputStream output) { String xmlStr = null; try { // 用来生成XML文件 // 实现此接口的对象包含构建转换结果树所需的信息 Result resultXml = new StreamResult(output); // 用来得到XML字符串形式 // 一个字符流,可以用其回收在字符串缓冲区中的输出来构造字符串 StringWriter writerStr = new StringWriter(); // 构建转换结果树所需的信息。 Result resultStr = new StreamResult(writerStr); // 创建SAX转换工厂 SAXTransformerFactory sff = (SAXTransformerFactory) SAXTransformerFactory .newInstance(); // 转换处理器,侦听 SAX ContentHandler // 解析事件,并将它们转换为结果树 Result TransformerHandler th = sff.newTransformerHandler(); // 将源树转换为结果树 Transformer transformer = th.getTransformer(); // 设置字符编码 transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); // 是否缩进 transformer.setOutputProperty(OutputKeys.INDENT, "yes"); // 设置与用于转换的此 TransformerHandler 关联的 Result // 注:这两个th.setResult不能同时启用 th.setResult(resultXml); // th.setResult(resultStr); //创建根元素<calsses>,并设置其属性为空 th.startDocument(); AttributesImpl attr = new AttributesImpl(); th.startElement("", "calsses", "calsses", attr); //创建一级子元素<group>,并设置其属性 attr.clear(); attr.addAttribute("","name", "name", "", "一年级"); attr.addAttribute("","num", "num", "", "10"); th.startElement("", "", "group", attr); //创建二级子元素<person>,并设置其属性 attr.clear(); attr.addAttribute("","name", "name", "", "小明"); attr.addAttribute("","age", "age", "", "7"); th.startElement("", "", "person", attr); //创建三级子元素<chinese>,并设置其值 attr.clear(); th.startElement("", "", "chinese", attr); th.characters("语文90".toCharArray(), 0, "语文90".length()); th.endElement("", "", "chinese"); //创建三级子元素<english>,并设置其值 th.startElement("", "", "english", attr); th.characters("英语80".toCharArray(), 0, "英语80".length()); th.endElement("", "", "english"); th.endElement("", "", "person"); th.endElement("", "", "group"); th.endElement("", "calsses", "calsses"); th.endDocument(); xmlStr = writerStr.getBuffer().toString(); } catch (TransformerConfigurationException e) { Log.e("TEST", ""+e.toString()); } catch (SAXException e) { Log.e("TEST", ""+e.toString()); } catch (Exception e) { Log.e("TEST", ""+e.toString()); } Log.e("TEST","生成的"+xmlStr); return xmlStr; } }
Call this method to achieve the purpose of creating xml files.
new SxaCreateXml().saxToXml(openFileOutput("sax.xml", Context.MODE_PRIVATE));
The generated sax.xml file is still in the data/data/cn.xxx.xxx/files folder.
<?xml version="1.0" encoding="UTF-8"?>
<calsses> <group name="一年级" num="10"> <person name="小明" age="7"> <chinese>语文90</chinese> <english>英语80</english> </person> </group> </calsses>
The above is the content of the xml file created by android sax. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!

When processing XML and RSS data, you can optimize performance through the following steps: 1) Use efficient parsers such as lxml to improve parsing speed; 2) Use SAX parsers to reduce memory usage; 3) Use XPath expressions to improve data extraction efficiency; 4) implement multi-process parallel processing to improve processing speed.

RSS2.0 is an open standard that allows content publishers to distribute content in a structured way. It contains rich metadata such as titles, links, descriptions, release dates, etc., allowing subscribers to quickly browse and access content. The advantages of RSS2.0 are its simplicity and scalability. For example, it allows custom elements, which means developers can add additional information based on their needs, such as authors, categories, etc.

RSS is an XML-based format used to publish frequently updated content. 1. RSSfeed organizes information through XML structure, including title, link, description, etc. 2. Creating RSSfeed requires writing in XML structure, adding metadata such as language and release date. 3. Advanced usage can include multimedia files and classified information. 4. Use XML verification tools during debugging to ensure that the required elements exist and are encoded correctly. 5. Optimizing RSSfeed can be achieved by paging, caching and keeping the structure simple. By understanding and applying this knowledge, content can be effectively managed and distributed.

RSS is an XML-based format used to publish and subscribe to content. The XML structure of an RSS file includes a root element, an element, and multiple elements, each representing a content entry. Read and parse RSS files through XML parser, and users can subscribe and get the latest content.

XML has the advantages of structured data, scalability, cross-platform compatibility and parsing verification in RSS. 1) Structured data ensures consistency and reliability of content; 2) Scalability allows the addition of custom tags to suit content needs; 3) Cross-platform compatibility makes it work seamlessly on different devices; 4) Analytical and verification tools ensure the quality and integrity of the feed.

The implementation of RSS in XML is to organize content through a structured XML format. 1) RSS uses XML as the data exchange format, including elements such as channel information and project list. 2) When generating RSS files, content must be organized according to specifications and published to the server for subscription. 3) RSS files can be subscribed through a reader or plug-in to automatically update the content.

Advanced features of RSS include content namespaces, extension modules, and conditional subscriptions. 1) Content namespace extends RSS functionality, 2) Extended modules such as DublinCore or iTunes to add metadata, 3) Conditional subscription filters entries based on specific conditions. These functions are implemented by adding XML elements and attributes to improve information acquisition efficiency.

RSSfeedsuseXMLtostructurecontentupdates.1)XMLprovidesahierarchicalstructurefordata.2)Theelementdefinesthefeed'sidentityandcontainselements.3)elementsrepresentindividualcontentpieces.4)RSSisextensible,allowingcustomelements.5)Bestpracticesincludeusing


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