Java复制图片到其他路径

@Test
    public void input() {
        String filePath1 = "e:\\tupian.jpg";
        String filePath2 = "d:\\tupian.jpg";
        FileInputStream fileInputStream = null;
        FileOutputStream fileOutputStream = null;
        int readLen = 0;
        byte[] b = new byte[10240];
        try {
            fileInputStream = new FileInputStream(filePath1);
            fileOutputStream = new FileOutputStream(filePath2);
           while ((readLen = fileInputStream.read(b)) != -1) {
                fileOutputStream.write(new String(b,0, readLen).getBytes(), 0, readLen);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                fileInputStream.close();
                fileOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

@Test
    public void input() {
        String filePath1 = "e:\\tupian.jpg";
        String filePath2 = "d:\\tupian.jpg";
        FileInputStream fileInputStream = null;
        FileOutputStream fileOutputStream = null;
        int readLen = 0;
        byte[] b = new byte[10240];
        try {
            fileInputStream = new FileInputStream(filePath1);
            fileOutputStream = new FileOutputStream(filePath2);
           while ((readLen = fileInputStream.read(b)) != -1) {
                fileOutputStream.write(new String(b,0, readLen).getBytes());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                fileInputStream.close();
                fileOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

@Test
    public void input() {
        String filePath1 = "e:\\tupian.jpg";
        String filePath2 = "d:\\tupian.jpg";
        FileInputStream fileInputStream = null;
        FileOutputStream fileOutputStream = null;
        int readLen = 0;
        byte[] b = new byte[10240];
        try {
            fileInputStream = new FileInputStream(filePath1);
            fileOutputStream = new FileOutputStream(filePath2);
           while ((readLen = fileInputStream.read(b)) != -1) {
                fileOutputStream.write(b, 0, readLen);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                fileInputStream.close();
                fileOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

只有第三个可以完成复制，不知道前两个错误的原因

String可能内部把二进制数据当字符串，进行编码转换了。