我有一个带有汉字文本的文件，我想将这些文本复制到另一个文件中。但是文件输出混乱了中文字符。注意，在我的代码中，我已经在使用“ UTF8”作为编码了：

BufferedReader br = new BufferedReader(new FileReader(inputXml));
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
sb.append(line);
sb.append("\n");
line = br.readLine();
}
String everythingUpdate = sb.toString();

Writer out = new BufferedWriter(new OutputStreamWriter(
        new FileOutputStream(outputXml), "UTF8"));

out.write("");
out.write(everythingUpdate);
out.flush();
out.close();