java response输出文件流

1、设置ContentType

response.setContentType("application/x-download");

2、设置文件名，并指定编码格式

fileName = URLEncoder.encode("浏览器要显示的文件名", "UTF-8");
response.setCharacterEncoding("UTF-8");

3、将文件名addHeader

response.addHeader("Content-Disposition", "attachment;filename=" + fileName);

4、读取文件流写入response

    File file = new File(filePath);
    try {
            InputStream stream = new FileInputStream(file);
 
            ServletOutputStream out = response.getOutputStream();
 
            byte buff[] = new byte[1024];
            int length = 0;
 
            while ((length = stream.read(buff)) > 0) {
                out.write(buff,0,length);
            }
            stream.close();
 
            out.close();
 
            out.flush();
 
        } catch (IOException e) {
            e.printStackTrace();
        }

5、完成