Java | 解决FileInputStream 读取文件中文乱码问题

当Java中使用 FileInputStream 读取txt等文档时，中文会产生乱码，解决方法如下：

fis = new FileInputStream(file);
InputStreamReader reader = new InputStreamReader(fis,"UTF-8"); 
BufferedReader br = new BufferedReader(reader);
String line;
while ((line = br.readLine()) != null) {
    System.out.println(line);
}
br.close();
reader.close();