实现pdf文件返回到前端直接被下载_c#下载pdf文件返回前端-优快云博客

本文介绍了一种在Java Web应用中实现PDF文件下载的方法。针对不同浏览器类型处理文件名编码问题，确保正确显示中文文件名，并通过FileInputStream读取文件内容，将其输出到客户端。

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public void pdfdownload(HttpServletRequest request, HttpServletResponse response)
//实现返回文件下载功能
        String fileName = "testout.pdf";//文件名
        String fullPath = "D:Environment/testout.pdf";//文件本地路径

        if (fullPath.contains("\\")) {
            fullPath.replaceAll("\\\\","\\\\\\\\");
        }

        File f = new File(fullPath);


        // 解决中文名称乱码问题
        final String userAgent = request.getHeader("USER-AGENT");
        if (userAgent.contains("MSIE")
                || userAgent.contains("Trident")
                || userAgent.contains("Edge")) { //IE浏览器
            fileName = URLEncoder.encode(fileName, "UTF-8");
        } else if (userAgent.contains("Mozilla")) { //google,火狐浏览器
            fileName = new String(fileName.getBytes(), "ISO8859-1");
        } else {
            fileName = URLEncoder.encode(fileName, "UTF-8"); //其他浏览器
        }

        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", "attchement;filename=" + fileName );

        try (FileInputStream fileInputStream = new FileInputStream(fullPath)) {
            OutputStream outputStream = response.getOutputStream();
            byte[] b = new byte[1024];
            int j;
            while ((j = fileInputStream.read(b)) > 0) {
                outputStream.write(b, 0, j);
            }
            outputStream.flush();
            outputStream.close();
        } catch (IOException e) {
           e.getMessage();
        }