IO流必知必会(4)——OutputStream和Writer

OutputStream和Writer也很类似，其中Writer是以字节作为数据传输单位，允许使用String作为参数。

public class FileOutputTest {
    public static void main(String[] args) {
        try (FileInputStream in = new FileInputStream(
                "src/inputandoutput/FileOutputTest.java");
                FileOutputStream out = new FileOutputStream("newFile.txt")) {
            byte[] buff = new byte[1024];
            int hasRead = 0;
            while ((hasRead = in.read(buff)) > 0) {
                out.write(buff, 0, hasRead);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

如果想要直接输出字符串的内容，使用Writer会有更好的效果。

public class FileWriterTest {
    public static void main(String[] args) {
        try (FileWriter fw = new FileWriter("fw.txt")) {
            fw.write("我是鸭鸭\r\n");
            fw.write("I can fly!");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}