BufferedReader 读取 UTF-8 文件中文乱码

读取 txt 文件乱码：

BufferedReader read = new BufferedReader(new FileReader(new File(filenameString)));

解决乱码代码示例：

InputStreamReader isr = new InputStreamReader(new FileInputStream(filenameString), "UTF-8");

BufferedReader read = new BufferedReader(isr);