利用dom4j生成带dom的xml文件

直接利用dom4j生成的xml是不带dom头的，但需要应用中需要带dom头的xml文件，比如fusionchart在加载xml数据文件时 ，要求数据文件为带dom头的xml，下面代码示例如何生成带dom头的xml。

public static Document createDom(Map<String,List> data){

Document doc = DocumentHelper.createDocument();

Element root = doc.addElement("graph");

root.addAttribute("caption", "xxx");

// root.addAttribute("decimalPrecision", "xxx");

// root.addAttribute("rotateNames", "xxx");

int colorIndex = 0;

for(Map.Entry<String,List> entry:data.entrySet()){

Element set = root.addElement("set");

set.addAttribute("name", entry.getKey());

set.addAttribute("value",(String)(entry.getValue()).get(0));

set.addAttribute("color", ColorUtil.colorList[colorIndex++]);

}

return doc;

}

public static void writeXmlWithBom(String parentPath,Document doc,String fileName){

try {

String filePath = parentPath+File.separator+fileName+".xml";

String tempFileName = parentPath+File.separator+"temp.xml";

File tempFile = new File(tempFileName);

if(tempFile.exists()){

tempFile.delete();

}

OutputFormat format = OutputFormat.createPrettyPrint();

format.setEncoding("UTF-8");

XMLWriter
writer = new XMLWriter(new FileOutputStream(tempFileName), format);

writer.write(doc);

writer.close();

FileOutputStream fops = new FileOutputStream(fileName);

//首先添加三个bom头字节

fops.write(new byte[]{(byte)0xEF, (byte)0xBB, (byte)0xBF});

FileWriter fileWriter = new FileWriter(fileName, true);

//使用自己流进行读文件，可以防止中文乱码

BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(tempFileName)));

String data ="";

while((data = br.readLine())!=null){

fileWriter.write(data);

fileWriter.write("\r\n");

}

fops.close();

br.close();

fileWriter.close();

tempFile.delete();

} catch (FileNotFoundException e) {

e.printStackTrace();

}catch (IOException e) {

e.printStackTrace();

}

}

需要注意字节流和字符流的使用，防止出现中文乱码