文件和byte数组

写byte到文件

 

byte[] diagram = test.getDiagramDefinition(); BufferedOutputStream stream = null; File file = null; try { file = new File("e://result.xml"); FileOutputStream fstream = new FileOutputStream(file); stream = new BufferedOutputStream(fstream); stream.write(diagram); } catch (Exception e) { e.printStackTrace(); } finally { if (stream != null) { try { stream.close(); } catch (IOException e1) { e1.printStackTrace(); } } }

 

 

 

 

读文件到byte

    File file = new File(fileName);InputStream is = new FileInputStream(file); // Get the size of the file long length = file.length(); // You cannot create an array using a long type. // It needs to be an int type. // Before converting to an int type, check // to ensure that file is not larger than Integer.MAX_VALUE. if (length > Integer.MAX_VALUE) { // File is too large } // Create the byte array to hold the data byte[] bytes = new byte[(int)length]; // Read in the bytes int offset = 0; int numRead = 0; while (offset < bytes.length && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) { offset += numRead; } // Ensure all the bytes have been read in if (offset < bytes.length) { throw new IOException("Could not completely read file "+file.getName()); } // Close the input stream and return bytes is.close(); return bytes;