IO流 不用生成文件

InputStream fin = new ByteArrayInputStream(content)；

OutputStream baos = new ByteArrayOutputStream();

byte[] content = baos.toByteArray()；

文件的读写

        byte[] in2b = null;

        ByteArrayOutputStream swapStream = null;

        InputStream fis = null;

        String filePath = "";

        try {

            filePath = "D://bpm.docx";

            fis = new FileInputStream(new File(filePath));

            swapStream = new ByteArrayOutputStream();

            byte[] buff = new byte[1024];

            int rc = 0;

            while ((rc = fis.read(buff, 0, 1024)) > 0) {

                swapStream.write(buff, 0, rc);

            }

            in2b = swapStream.toByteArray();

        } catch (Exception e) {

            e.printStackTrace();

        }finally{

            try {

                fis.close();

                swapStream.close();

                fis.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

        return in2b;