前端代碼：<a?:href="'/api/down-api/down'"?download="down.xlsx">下載</a>后端代碼：接口：@ApiOperation(value?=?"下載") @GetMapping("/down") public?void?downTemplate(HttpServletResponse?response)?{ ????String?fileName?=?"down.xlsx"; ????couponService.down(response,?fileName); }實(shí)現(xiàn)類：public?void?down(HttpServletResponse?response?,String?filename)?{ ????//?讀取要下載的文件，保存到文件輸入流 ????FileInputStream?in?=?null; ????OutputStream?out?=?null; ????try?{ ????????//?得到要下載的文件（文件存放在項(xiàng)目resources的static文件夾里） ????????File?file?=?new?File("src\\main\\resources\\static"?+?"\\"?+?filename); ????????//?如果文件不存在 ????????if?(!file.exists())?{ ????????????throw?new?BusinessException("Could?not?read?file"); ????????} ????????//?設(shè)置響應(yīng)頭，控制瀏覽器下載該文件 ????????response.setHeader("Content-Disposition",?"attachment;filename="+filename); ????????response.setHeader("Content-Type",?"application/octet-stream;charset=UTF-8"); ????????response.setContentType("application/octet-stream"); ????????in?=?new?FileInputStream(file); ????????//?創(chuàng)建輸出流 ????????out?=?response.getOutputStream(); ????????//?創(chuàng)建緩沖區(qū) ????????byte?buffer[]?=?new?byte[1024]; ????????int?len?=?0; ????????//?循環(huán)將輸入流中的內(nèi)容讀取到緩沖區(qū)當(dāng)中 ????????while?((len?=?in.read(buffer))?>?0)?{ ????????????//?輸出緩沖區(qū)的內(nèi)容到瀏覽器，實(shí)現(xiàn)文件下載 ????????????out.write(buffer,?0,?len); ????????} ????????//?關(guān)閉文件輸入流 ????????in.close(); ????????//?關(guān)閉輸出流 ????????out.close(); ????}?catch?(Exception?e)?{ ????????e.printStackTrace(); ????} }