JAVA文件批量下载打成压缩包

深藏阁楼爱情的钟 2022-10-16 06:10 257阅读 0赞

/** * * @param request * @param response * @param filePathList 文件路径集合 */
        @ApiOperation(value = "文件批量下载")
        @PostMapping("/downLoad/zip")
        public void download(@RequestBody List<String> filePathList, HttpServletRequest request, final HttpServletResponse response) { 
    
            List<File> resultFileList = new ArrayList<>();
            File file = null;
            try { 
                for (String filePath:filePathList) { 
                    String fileName =  filePath.substring(filePath.lastIndexOf("/")+1);
                    log.info("文件路径转一下格式");
                    filePath = URLDecoder.decode(filePath, "utf-8");
    				log.info("保存的路径名称");
                    String destFile = "/home/data/" + fileName;
                    log.info("1. 先从资源服务器下载 文件");
                    HttpUtil.downloadFile(filePath , destFile);
                    log.info("2. 返回file");
                    file = new File(destFile);
                    resultFileList.add(file);
    
                }
                log.info("3. 把文件压缩进去");
                File zipFile = new File("/home/data/批量下载.zip");
                zipFiles(resultFileList,zipFile);
                log.info("4. 把压缩包的文件流返回前端");
                FileDownload.downFile(request, response, "批量下载.zip", zipFile);
    
            } catch (Exception e) { 
                e.printStackTrace();
            } 
        }
    
    
    /** * * @param srcFiles 要压缩的文件 * @param zipFile 压缩后的压缩包 */
    public static void zipFiles(List<File> srcFiles, File zipFile) { 
            // 判断压缩后的文件存在不，不存在则创建
            if (!zipFile.exists()) { 
                try { 
                    zipFile.createNewFile();
                } catch (IOException e) { 
                    e.printStackTrace();
                }
            }
            // 创建 FileOutputStream 对象
            FileOutputStream fileOutputStream = null;
            // 创建 ZipOutputStream
            ZipOutputStream zipOutputStream = null;
            // 创建 FileInputStream 对象
            FileInputStream fileInputStream = null;
    
            try { 
                // 实例化 FileOutputStream 对象
                fileOutputStream = new FileOutputStream(zipFile);
                // 实例化 ZipOutputStream 对象
                zipOutputStream = new ZipOutputStream(fileOutputStream);
                // 创建 ZipEntry 对象
                ZipEntry zipEntry = null;
                // 遍历源文件数组
                int i = 1;
                for (File srcFile:srcFiles) { 
                    // 将源文件数组中的当前文件读入 FileInputStream 流中
                    fileInputStream = new FileInputStream(srcFile);
                    // 实例化 ZipEntry 对象，源文件数组中的当前文件，加个i防止有重名文件压缩失败
                    zipEntry = new ZipEntry("[" + i + "]" +srcFile.getName());
    
                    zipOutputStream.putNextEntry(zipEntry);
                    // 该变量记录每次真正读的字节个数
                    int len;
                    // 定义每次读取的字节数组
                    byte[] buffer = new byte[1024];
                    while ((len = fileInputStream.read(buffer)) > 0) { 
                        zipOutputStream.write(buffer, 0, len);
                    }
                    i++;
                }
                zipOutputStream.closeEntry();
                zipOutputStream.close();
                fileInputStream.close();
                fileOutputStream.close();
            } catch (IOException e) { 
                e.printStackTrace();
            }
    
        }
    
    
    
    
    public static void downFile(HttpServletRequest request, HttpServletResponse response, String filename, File file) throws IOException { 
    		// 文件存在才下载
    		if (file.exists()) { 
    			OutputStream out = null;
    			FileInputStream in = null;
    			try { 
    				// 1.读取要下载的内容
    				in = new FileInputStream(file);
    
    				// 2. 告诉浏览器下载的方式以及一些设置
    				// 解决文件名乱码问题，获取浏览器类型，转换对应文件名编码格式，IE要求文件名必须是utf-8, firefo要求是iso-8859-1编码
    				String agent = request.getHeader("user-agent");
    				if (agent.toLowerCase().contains("Firefox".toLowerCase())) { 
    					filename = new String(filename.getBytes("UTF-8"), "iso-8859-1");
    				} else { 
    					filename = URLEncoder.encode(filename, "UTF-8");
    				}
    				// 设置下载文件的mineType，告诉浏览器下载文件类型
    				String mineType = request.getServletContext().getMimeType(filename);
    				response.setContentType(mineType);
    				// 设置一个响应头，无论是否被浏览器解析，都下载
    				response.setHeader("Content-disposition", "attachment; filename=" + filename);
    				// 将要下载的文件内容通过输出流写到浏览器
    				out = response.getOutputStream();
    				int len = 0;
    				byte[] buffer = new byte[1024];
    				while ((len = in.read(buffer)) > 0) { 
    					out.write(buffer, 0, len);
    				}
    			} catch (IOException e) { 
    				e.printStackTrace();
    			} finally { 
    				if (out != null) { 
    					out.close();
    				}
    				if (in != null) { 
    					in.close();
    				}
    			}
    		}
    	}