SpringMVC系列-输出二进制图片

最新推荐文章于 2024-06-09 16:05:56 发布

原创最新推荐文章于 2024-06-09 16:05:56 发布 · 6.3k 阅读

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#SpringMVC #二进制 #图片

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本文主要探讨了如何使用SpringMVC框架来处理并输出二进制形式的图片，包括两种方法：SpringMVC的方式和HttpServlet的方式。通过实例详细解析了在Web应用中读取和发送二进制图片数据的关键步骤和技术要点。

SpringMVC方式：

	@RequestMapping(value = "/image/{id}", method = RequestMethod.GET)
	public ResponseEntity<byte[]> image(@PathVariable String id) throws IOException {
		Map<String, Object> book = bookService.find(id);
		if (book == null) {
			return new ResponseEntity<byte[]>(HttpStatus.NO_CONTENT);
		}
		byte[] zp = (byte[]) book.get("bookimage");
		HttpHeaders headers = new HttpHeaders();
		headers.setContentType(MediaType.IMAGE_PNG);
		return new ResponseEntity<byte[]>(zp, headers, HttpStatus.OK);
	}

HttpServlet方式：

	@RequestMapping(value = "/getBookImage/{id}", method = RequestMethod.GET)
	public void getBookImage(@PathVariable String id, HttpServletResponse response) throws IOException {
		Map<String, Object> book = bookService.find(id);
		if (book == null) {
			return;
		}
		byte[] zp = (byte[]) book.get("bookimage");
		response.setContentType("image/png");
		OutputStream stream;
		stream = response.getOutputStream();
		stream.write(zp);
		stream.flush();
		stream.close();
	}