Java的输入与输出流InputStream/OutputStream

import org.testng.annotations.Test;
import java.io.*;

public class FileDemo {

    @Test
    public void fileTest() {

        //1.创建源
        File file = new File("jerry.txt");

        //2.选择流
        InputStream in = null;

        //3.操作
        try {
            in = new FileInputStream(file);
            int temp;
            while (true) {

                if (!((temp = in.read()) != -1)) break;
                //read()返回是字符的编码，我们要读取的字符是英文，所以转义成char
                System.out.print((char) temp);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
            //4.关闭流
            //注意:close(）要卸载finally里面。
            //如果不写在finally里面，而是写在前面catch里面，当出现异常时，close就不会被执行
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}