最近从网上看到很多介绍XML的文章,输出XML文件时候,示例代码为:
...
//把XML文档输出到指定的文件
FileOutputStream outStream = new FileOutputStream(outFile);
OutputStreamWriter outWriter = new OutputStreamWriter(outStream);
( ( org.apache.crimson.tree.XmlDocument) doc).write(outWriter, "GB2312");
outWriter.close();
outStream.close();
...
很遗憾,这段代码是通过不了的...会出现Class Cast Exception错误!
而作者看来并没有意识到.
经过我的研究,提出了解决的办法.采用Transformer来输出XML文件。完整代码为
public static void callWriteXmlFile(Document doc, Writer w,
String encoding) {
try {
// Prepare the DOM document for writing
Source source = new DOMSource(doc);
// Prepare the output file
Result result = new StreamResult(w);
// Write the DOM document to the file
Transformer xformer = TransformerFactory.newInstance()
.newTransformer();
xformer.setOutputProperty(OutputKeys.ENCODING, encoding);
xformer.transform(source, result);
}
catch (TransformerConfigurationException e) {
e.printStackTrace();
}
catch (TransformerException e) {
e.printStackTrace();
}
}
经过我在winxp,jdk1.4环境下编译通过.要包含的包为:
import javax.xml.parsers.*; //XML解析器接口
import org.w3c.dom.*; //XML的DOM实现
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
对应的,出错的代码应该改正为:
//把XML文档输出到指定的文件
FileOutputStream outStream = new FileOutputStream(outFile);
OutputStreamWriter outWriter = new OutputStreamWriter(outStream);
//出现错误class cast exception
// ( ( org.apache.crimson.tree.XmlDocument) doc).write(outWriter, "GB2312");
//换另外的输出xml方法
callWriteXmlFile(doc, outWriter, "GB2312");
outWriter.close();
outStream.close();
所以,
