IO流读写操作学习篇（字节流，字符流）

public class IOStream {
    //字节流
    @Test
    public void test1() {
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            inputStream = new FileInputStream("test.jpg");
            outputStream = new FileOutputStream("test_back.jpg");
            int length = -1;
            byte[] buffer = new byte[1024];
            while ((length = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer,0,length);
            }

        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }finally {
            if (outputStream != null) {
                try {
                    outputStream.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
    //字符流
    @Test
    public void test2() {
        FileReader fileReader = null;
       FileWriter fileWriter = null;
        try {
            fileReader = new FileReader("test.txt");
            fileWriter = new FileWriter("test_back.txt");
            int length = -1;
            char[] buffer = new char[10];
            while ((length = fileReader.read(buffer)) != -1) {
                fileWriter.write(buffer,0,length);
            }
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }finally {
            if (fileWriter != null) {
                try {
                    fileWriter.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            if (fileReader != null) {
                try {
                    fileReader.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
}