dom4j向xml文件中写数据乱码问题解决

这是原先利用dom4j向xml文件中写数据的代码

public void save(Student e) {
// TODO Auto-generated method stub
Document doc = DocumentHelper.createDocument();
doc = DomUtils.parse("db.xml");
Element root = (Element) doc.selectSingleNode("/students");
Element stu = root.addElement("student").addAttribute("id", e.getId()).addAttribute("name", e.getName());
List<Score> score = e.getScore();
for (Score s : score) {
Element sco = stu.addElement("score").addAttribute("project", s.getProject()).addAttribute("value",
s.getValue());
}
OutputFormat format = OutputFormat.createPrettyPrint();
try {
XMLWriter writer = new XMLWriter(new FileWriter("db.xml"), format);
writer.write(doc);
writer.close();

} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

}

db.xml文件内容如下：



进行操作如截图



此时的db.xml文件内容会发生乱码，不仅新插入的数据乱码，原来的数据同样也发生乱码



解决办法：

设置format编码格式为“utf-8”，再将字符流改为字节流

即将XMLWriter writer = new XMLWriter(new FileWriter("db.xml"), format);

改为XMLWriter writer = new XMLWriter(new FileOutputStream("db.xml"), format);

OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("utf-8");
try {
XMLWriter writer = new XMLWriter(new FileOutputStream("db.xml"), format);
// XMLWriter writer = new XMLWriter(new OutputStreamWriter(
// new FileOutputStream("db.xml"),"utf-8"),format);
writer.write(doc);
writer.close();

} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}