处理java在解析csv文件包含日语文字乱码，导出成csv时日语

解析时：InputStream inputStream = file.getInputStream();

InputStreamReader is =new InputStreamReader(inputStream,"utf-8");

注意在生成输入流时设置utf-8编码。

导出时（这里是使用PrintWriter）：在生成输出流时设置utf-8编码

Writer write =new OutputStreamWriter(new FileOutputStream(new File(file,fileName)), "UTF-8");

PrintWriter printWriter=new PrintWriter(write);