文件二进制互转

/**
 * 将文件转换成byte数组
 * @param tradeFile
 * @return
 */
public static byte[] File2byte(File tradeFile){
 byte[] buffer = null;
 try
 {
 FileInputStream fis = new FileInputStream(tradeFile);
 ByteArrayOutputStream bos = new ByteArrayOutputStream();
 byte[] b = new byte[1024];
 int n;
 while ((n = fis.read(b)) != -1)
 {
 bos.write(b, 0, n);
 }
 fis.close();
 bos.close();
 buffer = bos.toByteArray();
 }catch (FileNotFoundException e){
 e.printStackTrace();
 }catch (IOException e){
 e.printStackTrace();
 }
 return buffer;
}


/**
 * 将byte数组转换成文件 (输出到指定目录)
 * filePath 文件输出路径
 */
public static void byte2File(byte[] byte1,String filePath,String fileName){
 BufferedOutputStream bos=null;
 FileOutputStream fos=null;
 File file=null;
 try{
 File dir=new File(filePath);
 if(!dir.exists() && !dir.isDirectory()){//判断文件目录是否存在
 dir.mkdirs();
 }
 file=new File(filePath+fileName);
 fos=new FileOutputStream(file);
 bos=new BufferedOutputStream(fos);
 bos.write(byte1);
 }
 catch(Exception e){
 System.out.println(e.getMessage());
 e.printStackTrace();
 }
 finally{
 try{
 if(bos != null){
 bos.close();
 }
 if(fos != null){
 fos.close();
 }
 }
 catch(Exception e){
 System.out.println(e.getMessage());
 e.printStackTrace();
 }
 }
}