罗锐原数据分享

/**
	 * 导出CSV
	 */
	@RequestMapping("/exportCSV.do")
	public ResponseEntity<byte[]> exportCSV(){
		ResponseEntity<byte[]> resEntity = null;
		try {
			String fileName="lry.csv";
			HttpHeaders headers = new HttpHeaders();
			//返回下载类型
            headers.setContentType(new MediaType("application","csv"));
			headers.add("Content-Disposition","attchement;filename=" + fileName);
			HttpStatus statusCode = HttpStatus.OK;
			resEntity = new ResponseEntity<byte[]>(fileToByteArrChannel("D:/lry.csv"), headers, statusCode);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return resEntity;
	}
	
	public byte[] fileToByteArrChannel(String path) throws Exception {
		FileChannel fc = null;
		RandomAccessFile raFile=null;
		byte[] result=null;
		try {
			raFile = new RandomAccessFile(path, "r");
			fc =raFile.getChannel();
			MappedByteBuffer byteBuffer = fc.map(MapMode.READ_ONLY, 0,fc.size()).load();
			result= new byte[(int) fc.size()];
			if (byteBuffer.remaining() > 0) {
				byteBuffer.get(result, 0, byteBuffer.remaining());
			}
		} catch (IOException e) {
			e.printStackTrace();
			throw e;
		} finally {
			if(fc!=null){
				try {
					fc.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if(raFile!=null){
				try {
					raFile.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return result;
	}