JavaME 的最佳二进制 XML 格式

JavaME是一种用于开发移动设备上应用程序的平台，它使用一种特殊的二进制XML格式来传输和存储数据。这种格式被称为最佳二进制XML格式，它减少了数据传输和存储的大小，提高了性能和效率。本文将介绍最佳二进制XML格式的特点，并提供一个案例代码来演示其用法。

java
import javax.microedition.io.Connector;
import javax.microedition.io.file.FileConnection;
import org.kxml2.io.KXmlParser;
import org.kxml2.io.KXmlSerializer;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class BinaryXmlExample {
    public static void main(String[] args) {
        try {
            // 创建一个XML文档
            XmlSerializer serializer = new KXmlSerializer();
            FileConnection fileConnection = (FileConnection) Connector.open("file:///example.xml", Connector.WRITE);
            OutputStream outputStream = fileConnection.openOutputStream();
            serializer.setOutput(outputStream, "UTF-8");
            serializer.startDocument("UTF-8", null);
            serializer.startTag(null, "root");
            serializer.startTag(null, "element");
            serializer.text("Hello, World!");
            serializer.endTag(null, "element");
            serializer.endTag(null, "root");
            serializer.endDocument();
            outputStream.close();
            fileConnection.close();
            // 解析XML文档
            FileConnection fileConnection2 = (FileConnection) Connector.open("file:///example.xml", Connector.READ);
            InputStream inputStream = fileConnection2.openInputStream();
            XmlPullParser parser = new KXmlParser();
            parser.setInput(inputStream, "UTF-8");
            int eventType = parser.getEventType();
            while (eventType != XmlPullParser.END_DOCUMENT) {
                if (eventType == XmlPullParser.START_TAG) {
                    System.out.println("Start tag: " + parser.getName());
                } else if (eventType == XmlPullParser.TEXT) {
                    System.out.println("Text: " + parser.getText());
                } else if (eventType == XmlPullParser.END_TAG) {
                    System.out.println("End tag: " + parser.getName());
                }
                eventType = parser.next();
            }
            inputStream.close();
            fileConnection2.close();
        } catch (XmlPullParserException | IOException e) {
            e.printStackTrace();
        }
    }
}