java用io流打包下载文件

来源：互联网发布：retas for mac 下载编辑：程序博客网时间：2024/05/21 12:34

ByteArrayOutputStream bas = new ByteArrayOutputStream();//内存流，将流数据放在内存中

ZipOutputStream out = new ZipOutputStream(bas);将多个文件打包成一个zip文件进行下载

//将文件以流的方式写入

           for (int i = 0; i < files.length; i++) {
               FileInputStream in=new FileInputStream(files[i]);
                    out.putNextEntry(new ZipEntry(files[i].getName()));
                    int len;
                    while((len=in.read(buf))>0){
                        out.write(buf,0,len);
                    }
                    out.closeEntry();
                    in.close();
           }

out.close();关闭

          // 下载文件名中文乱码
           HttpServletRequest request = ServletActionContext.getRequest();
           if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0) {
               fileName = URLEncoder.encode(fileName, "UTF-8");
           } else {
               fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");
           }
           //响应
           HttpServletResponse response = ServletActionContext.getResponse();
           response.reset();
           response.setContentType("application/octet-stream;charset=UTF-8");
           response.setHeader("Accept-ranges", "bytes");
           response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + ".zip\"");
           byte[] b = bas.toByteArray();
           response.addHeader("Content-Length", ""+b.length);
           OutputStream os = new BufferedOutputStream(response.getOutputStream());
           os.write(b);
           os.flush();
           os.close();

后面将页面到后台的完整代码

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