SAXCreateXMLDocument

Posted 2020-10-15 zhangyugeng

package creatXMLDovument;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

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;

public class SAXCreateXMLDocument {

    public static void main(String[] args) {
        //1.创建sax转换器工厂
        SAXTransformerFactory factory=(SAXTransformerFactory) 
                SAXTransformerFactory.newInstance();
        
        try {
            //2.创建转换器处理器
            TransformerHandler handler=factory.newTransformerHandler();
            //3.处理器获得转换器
            Transformer  tf=handler.getTransformer();
            //4.通过Transformer设置XML文件
            tf.setOutputProperty(OutputKeys.ENCODING, "utf-8");
            tf.setOutputProperty(OutputKeys.INDENT,"yes");
            //5.创建一个result对象
            File f=new File("src/book3.xml");
            if(!f.exists())
            {
                f.createNewFile();
            }
            //不明白
            /*    StreamResult
              Construct a StreamResult from a byte stream. 
              Normally, a stream should be used rather than 
              a reader, so that the transformer may use 
              instructions contained in the transformation 
              instructions to control the encoding.
              从一个字节流构造一个流结果。正常来说，应该使用一个流
            一个读取器，所以这个转换器可能使用包含在这个转换的指令去控制编码。
             */
            
            /*    Result
             * An object that implements this interface 
              contains the information needed to build 
              a transformation result tree.
              实现该接口的对象包含构建所需的信息转换结果树
             */
            Result result=new StreamResult(new FileOutputStream(f));
            //不明白
            handler.setResult(result);
            //不明白
            AttributesImpl atts=new AttributesImpl();
            handler.startDocument();
            handler.startElement("", "", "bookstore", atts);
            atts.clear();
            
            handler.startElement("", "", "book", atts);
            atts.addAttribute("", "", "id", "", "1");
            
            atts.clear();
            handler.startElement("", "", "name", atts);
            handler.characters("叶兰".toCharArray(), 0, "叶兰".length());
            handler.endElement("", "", "name");
            
            handler.startElement("", "", "age", atts);
            handler.characters("19".toCharArray(), 0, "19".length());
            handler.endElement("", "", "age");
            
            handler.endElement("", "", "book");
            handler.endElement("", "", "bookstore");
            handler.endDocument();
            
            
        } catch (TransformerConfigurationException e) {
            
            e.printStackTrace();
        }catch (IOException e) {
                    
            e.printStackTrace();
        }catch (SAXException e) {
            
            e.printStackTrace();
        }

    }

}