IO文件读取

/**
 *按字节读取文件
 */
@Test
public void readerByte() {
    File file = new File("D:\\BindCheckControllerTest.java");
    File fileC = new File("D:\\CopyBindCheckControllerTest.java");

    FileInputStream inputStream = null;
    FileOutputStream outputStream = null;
    try {
        inputStream = new FileInputStream(file);
        outputStream = new FileOutputStream(fileC);
        byte[] bytes = new byte[1024];
        int num = 0;
        while ((num = inputStream.read(bytes)) != -1) {
            outputStream.flush();
            /**
             * 必须这样写，如果超出的话，会从字符流读取多余的数据
             * 不能使用outputStream.write(bytes) method
             */
            outputStream.write(bytes, 0, num);
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException ei) {
        ei.printStackTrace();
    } finally {
        try {
            inputStream.close();
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

/**
 * 按字符读取文件
 */
@Test
public void readerChar() {
    File file = new File("D:\\BindCheckControllerTest.java");
    File fileC = new File("D:\\CopyBindCheckControllerTest.java");

    FileReader reader = null;
    FileWriter writer = null;
    try {
        reader=new FileReader(file);
        writer=new FileWriter(fileC);
        char[] chars = new char[1024];
        int num = 0;
        while ((num = reader.read(chars)) != -1) {
            writer.flush();
            /**
             * 必须这样写，如果超出的话，会从字符流读取多余的数据
             */
            writer.write(chars,0,num);
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException ei) {
        ei.printStackTrace();
    } finally {
        try {
            reader.close();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}