SpringBoot如何通过一个url下载pdf到本地呢?

SpringBoot下载pdf到本地的实现思路

1.根据url,获取url对应的输入流
2.将获取的输入流copy到输出流中,进行相应的设置并返回

@GetMapping(“/download”)
public void download(@RequestParam(“url”) String urlStr, HttpServletResponse response) throws IOException {
	URL url = new URL(urlStr);
	HttpURLConnection conn = (HttpURLConnection)url.openConnection();
	//设置超时间为5秒
	// conn.setConnectTimeout(5*1000);
	//防止屏蔽程序抓取而返回403错误
	conn.setRequestProperty(“User-Agent”, “Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)”);
	try(InputStream inputStream = conn.getInputStream();
	OutputStream outputStream = response.getOutputStream()😉 {
	response.setContentType(“application/x-download”);
	response.addHeader(“Content-Disposition”, “attachment;filename=test.pdf”);
	// 将输入流拷贝到输出流中
	IOUtils.copy(inputStream, outputStream);
	outputStream.flush();
	}
}