Dom4j 改變XML編碼

Dom4j 改變XML編碼

Element rootElement = document.addElement("data");
document.setXMLEncoding("GBK");	//默認utf-8
...

使用“document.setXMLEncoding”這樣設置而生成的xml文件仍然是utf-8編碼。

需要使用OutputFormat設置輸出文件編碼格式。

 public static void writeXMLFile(Document document,File file,String Encoding){ try { OutputFormat format = OutputFormat.createPrettyPrint();//美化輸出 不想美化可以使用new OutputFormat(); format.setEncoding(Encoding.toUpperCase()); OutputStream out = new FileOutputStream(file); XMLWriter writer = new XMLWriter(out,format); writer.write(document); writer.close(); }catch (IOException e) { e.printStackTrace(); }

使用“OutputFormat”，可以設置xml輸出文件編碼，並且xml文件聲明處也會跟著改變。

引用別人答案：解釋“document.setXMLEncoding”和“format.setEncoding”設置編碼的區別

public class TestXML{ @Test public void test() throws IOException{ Document doc = new DefaultDocument(); doc.addElement("root"); // 這裡打印出來是默認的utf-8 System.out.println(doc.asXML()); doc.setXMLEncoding("utf-16"); // 這裡打印出來是修改後的utf-16 System.out.println(doc.asXML()); // 這裡沒有設置編碼格式默認保存的是utf-8，看一下dom4j的源碼就知道了 saveXML(doc, "D:\temp\test\test1.xml", null); // 這裡設置了所以保存以後編碼格式是big5 saveXML(doc, "D:\temp\test\test2.xml", "big5"); } private void saveXML(Document doc, String filePath, String encode) throws IOException{ OutputFormat format = new OutputFormat(); if (null != encode){ format.setEncoding(encode.toUpperCase()); } XMLWriter xmlWriter = new XMLWriter(new FileOutputStream(filePath),format); xmlWriter.write(doc); xmlWriter.flush(); xmlWriter.close(); }}

最後要說一下：

XMLWriter可以傳入OutputStream或者Writer
	XMLWriter writer = new XMLWriter(OutputStream, OutputFormat);
	XMLWriter writer = new XMLWriter(Writer, OutputFormat);
最初試著傳入了new FileWriter(file),如下
try {
		XMLWriter writer = new XMLWriter(new FileWriter(f), format);
		writer.write(document);
		writer.close();
		result = fileName;
	} catch (IOException e) { // TODO Auto-generated catch block
		e.printStackTrace();
	}	
但是得到的結果並不對。修改為如下後，結果正確。

			try {
				OutputFormat format = OutputFormat.createPrettyPrint();
				XMLWriter xmlWriter = new XMLWriter(new FileOutputStream(f), format);
				xmlWriter.write(document);
				xmlWriter.flush();
				xmlWriter.close();
				result = fileName;
			} catch (IOException e) { // TODO Auto-generated catch block
				e.printStackTrace();
				LOG.error("trans for XML error:", e);
			}
	記錄。	

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