Java生成XML的缩进和换行SAX

Java生成XML的缩进和换行SAX

2010-04-26 13:51

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zxcvbnmluton/archive/2010/04/26/5528747.aspx

二 SAX 用SAX生成xml并换行缩进

package xml;

import java.io.FileOutputStream;
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;

public class XMLHandler {

public String createXMLFile() {
   String xmlStr = null;
   try {
    Result resultXml = new StreamResult(new FileOutputStream("E://cities.xml"));
    StringWriter writerStr = new StringWriter();
    SAXTransformerFactory sff = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
    TransformerHandler th = sff.newTransformerHandler();
    Transformer transformer = th.getTransformer();
    transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");   
    th.setResult(resultXml);
    th.startDocument();
    AttributesImpl attr = new AttributesImpl();
    th.startElement("", "", "country", attr);
    th.startElement("", "", "china", attr);

    th.startElement("", "", "city", attr);
    String bj = "Beijing";
    th.characters(bj.toCharArray(), 0, bj.length());
    th.endElement("", "", "city");

    th.startElement("", "", "city", attr);
    String sh = "Shanghai";
    th.characters(sh.toCharArray(), 0, sh.length());
    th.endElement("", "", "city");

    th.endElement("", "", "china");
    th.endElement("", "", "country");
    th.endDocument();
    xmlStr = writerStr.getBuffer().toString();
   } catch (TransformerConfigurationException e) {
    e.printStackTrace();
   } catch (SAXException e) {
    e.printStackTrace();
   } catch (Exception e) {
    e.printStackTrace();
   }
   return xmlStr;
}

public static void main(String args[]) {
   XMLHandler xh = new XMLHandler();
   xh.createXMLFile();
}
}

用SAX生成的xml如下

<?xml version="1.0" encoding="UTF-8"?><country><china><city>Beijing</city><city>Shanghai</city></china></country>

同样没有换行和缩进

在代码中增加

transformer.setOutputProperty(OutputKeys.INDENT, "yes");

后生成的xml有了换行但仍没有缩进

<?xml version="1.0" encoding="UTF-8"?>
<country>
<china>
<city>Beijing</city>
<city>Shanghai</city>
</china>
</country>

同样按照DOM中的方法加空格

String four = "\n    ";
TransformerHandler.characters(four.toCharArray(),0,four.length());

最终SAX代码如下:

package xml;

import java.io.FileOutputStream;
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;

public class XMLHandler {

public String createXMLFile() {
   String xmlStr = null;
   try {
    Result resultXml = new StreamResult(new FileOutputStream("E://cities.xml"));
    StringWriter writerStr = new StringWriter();
    SAXTransformerFactory sff = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
    TransformerHandler th = sff.newTransformerHandler();
    Transformer transformer = th.getTransformer();
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
    transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");   
    th.setResult(resultXml);
    th.startDocument();
    String four = "\n    ";
    String eight = "\n        ";
    AttributesImpl attr = new AttributesImpl();
   
    th.startElement("", "", "country", attr);
   
    th.characters(four.toCharArray(),0,four.length());
   
    th.startElement("", "", "china", attr);
   
    th.characters(eight.toCharArray(),0,eight.length());

    th.startElement("", "", "city", attr);
    String bj = "Beijing";
    th.characters(bj.toCharArray(), 0, bj.length());
    th.endElement("", "", "city");

    th.characters(eight.toCharArray(),0,eight.length());
   
    th.startElement("", "", "city", attr);
    String sh = "Shanghai";
    th.characters(sh.toCharArray(), 0, sh.length());
    th.endElement("", "", "city");

    th.characters(four.toCharArray(),0,four.length());
   
    th.endElement("", "", "china");
    th.endElement("", "", "country");
    th.endDocument();
    xmlStr = writerStr.getBuffer().toString();
   } catch (TransformerConfigurationException e) {
    e.printStackTrace();
   } catch (SAXException e) {
    e.printStackTrace();
   } catch (Exception e) {
    e.printStackTrace();
   }
   return xmlStr;
}

public static void main(String args[]) {
   XMLHandler xh = new XMLHandler();
   xh.createXMLFile();
}
}

生成的XML

<?xml version="1.0" encoding="UTF-8"?>
<country>
    <china>
        <city>Beijing</city>
        <city>Shanghai</city>
    </china>
</country>