response.setContentType("application/pdf");转变成了response.setContentType("application/octet-stream; charset=UTF-8");后边怎么用这个二进制流

根据提供的引用内容，当将`response.setContentType("application/pdf")`转变为`response.setContentType("application/octet-stream; charset=UTF-8")`后，可以将二进制流用于以下方式之一：

1. 将二进制流保存为文件：

// 获取二进制流
InputStream inputStream = response.getInputStream();
// 创建文件输出流
OutputStream outputStream = new FileOutputStream("output.pdf");
// 将二进制流写入文件
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
    outputStream.write(buffer, 0, length);
}
// 关闭流
outputStream.close();
inputStream.close();

2. 将二进制流转换为字节数组：

// 获取二进制流
InputStream inputStream = response.getInputStream();
// 创建字节数组输出流
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
// 将二进制流写入字节数组输出流
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
    byteArrayOutputStream.write(buffer, 0, length);
}
// 获取字节数组
byte[] byteArray = byteArrayOutputStream.toByteArray();
// 关闭流
byteArrayOutputStream.close();
inputStream.close();

3. 将二进制流直接输出到客户端：

// 获取二进制流
InputStream inputStream = response.getInputStream();
// 创建输出流
OutputStream outputStream = response.getOutputStream();
// 将二进制流写入输出流
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
    outputStream.write(buffer, 0, length);
}
// 关闭流
outputStream.close();
inputStream.close();