Java读写文本文件

1.需求

以UTF-8编码，读写txt文件。

2.代码

2.1.写文件

        File file = new File("d://textfile.txt");
        FileOutputStream fileOutputStream = new FileOutputStream(file);
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(fileOutputStream, "UTF-8"));
        writer.write("hello world\n");
        writer.write("yep?");
        writer.flush();
        fileOutputStream.close();
        writer.close();

刚开始是直接使用FileWriter来写入，如下：

File file = new File("d:\\textfile.txt");
FileWriter fieWriter = new FileWriter(file);
fileWriter.write("helllo word\n");
fileWriter.write("yep?");
fieWriter.flush();
fileWriter.close();

但是这样没办法指定编码，中文可能会遇到乱码现象。因此，只有将File先加入FileOutputStream，然后new OutputStreamWriter的时候指定编码。

2.2.读文件

        File file = new File("d://textfile.txt");
        FileInputStream fileInputStream = new FileInputStream(file);
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(fileInputStream, "UTF-8"));
        String str = "";
        while ((str = bufferedReader.readLine()) != null) {
            System.out.println(str);
        }

        fileInputStream.close();
        bufferedReader.close();

3.Tips

文件读写，无非是Writer、Reader，以及读取File到流里面。以及Buffer。