dom4j 写出到xml文件后，文件编码又变回ANSI，手动另存改了，再次运行又变回去了，求解答

public UserDao() {
SAXReader saxReader = new SAXReader();
file = new File("G:/temp/diary/users.xml");
if(!file.exists()){
doc = DocumentHelper.createDocument();
doc.addElement("Users");
write();

    }
    else{
        try {
             doc = saxReader.read(file);
        } catch (DocumentException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
    }
}


private  void  write(){
    try{

        OutputFormat format = OutputFormat.createPrettyPrint();
        //format.setEncoding("UTF-8");

        format.setNewlines(true);
        XMLWriter output = new XMLWriter(new FileWriter(file),format);

        output.write(doc);
        output.close();
        }catch(Exception e2){}

}

http://www.cnblogs.com/HigginCui/p/5896846.html