OutputStreamWriter编码转码器

      OutputStreamWriter ow = new OutputStreamWriter(new FileOutputStream("IO\\utf-8.txt"),"UTF-8");
      ow.write("我爱你");
      ow.flush();
      ow.close();

"UTF-8"声明调用的编码，不写也默认为UTF-8

输出结果：为中文
IDea中默认编码为UTF-8
.
.
当将UTF-8改为GBK(中文编码)

OutputStreamWriter ow = new OutputStreamWriter(new FileOutputStream("IO\\utf-8.txt"),"UTF-8");

输出结果会出现乱码