StAX 生成XML文件

package me.test;

import java.io.FileOutputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;

import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamWriter;
//&
public class StAXTest_GBK {
    public static void main(String[] args) throws Exception {
        // GBK
        System.out.println("JVM default charset = " + Charset.defaultCharset());
        
        String s = "汉语, English, にほんご";
                
        XMLOutputFactory output = XMLOutputFactory.newInstance();
        output.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, false);
        
        OutputStream out = new FileOutputStream("C:/aa.txt");
        XMLStreamWriter writer = output.createXMLStreamWriter(out, "UTF-8");
        // When output encoding is "UTF-8", result is something like:
        // 汉语, English, にほんご
        // When output encoding is "GBK", result is something like:
        // 汉语, English, にほんご

        writer.writeStartDocument();
        writer.setDefaultNamespace("");
        writer.writeStartElement("", "a");
        
        writer.writeCharacters(s);
        writer.writeEndElement();
        writer.flush();
    }
}