Java批量下载打包成zip文件
话不多说,直接上代码
/**
* 批量下载
* @param filepathList (格式xx,xx2,xx3) 文件路径
* @param request
* @param response
*/
@RequestMapping(value = "downloadPlanFile")
public void downloadPlanFile(@RequestParam(value = "filePathList",required = false) List<String> filepathList,
HttpServletRequest request,HttpServletResponse response){
omsEducationDataService.downloadPlanFile(filepathList,request,response);
}
/**
* 批量下载
* @param filepathList (格式xx,xx2,xx3) 文件路径
* @param request
* @param response
*/
HttpServletResponse downloadPlanFile(List<String> filepathList, HttpServletRequest request,HttpServletResponseresponse);
/**
* 批量下载
* @param filepathList (格式xx,xx2,xx3) 文件路径
* @param request
* @param response
*/
public HttpServletResponse downloadPlanFile(List<String> filepathList, HttpServletRequest request, HttpServletResponse response) {
HttpServletResponse response1 = fileUploadTool.downLoadBatch(filepathList,request,response);
return response1;
}
/**
* <b>功能描述: 批量下载</b>
* @Param: [filepathList, request, response]
* @Return: javax.servlet.http.HttpServletResponse
* @Author: luoshuai
* @Date: 2020/9/15 20:10
*/
public HttpServletResponse downLoadBatch(List<String> filepathList, HttpServletRequest request, HttpServletResponse response) {
if(filepathList == null || filepathList.size() < 1){
throw new CustomMessageException("未选择要下载的文件资料");
}
//响应头的设置
response.reset();
response.setCharacterEncoding("utf-8");
response.setContentType("multipart/form-data");
//设置压缩包的名字
String dates = String.valueOf(new Date().getTime());
String billname = "行前教育资料包-" + dates;
String downloadName = billname + ".zip";
//返回客户端浏览器的版本号、类型
String agent = request.getHeader("USER-AGENT");
try {
//针对IE或者以IE为内核的浏览器:
if (agent.contains("MSIE") || agent.contains("Trident")) {
downloadName = java.net.URLEncoder.encode(downloadName, "UTF-8");
} else {
//非IE浏览器的处理:
downloadName = new String(downloadName.getBytes("UTF-8"), "ISO-8859-1");
}
} catch (Exception e) {
e.printStackTrace();
}
response.setHeader("Content-Disposition", "attachment;fileName=\"" + downloadName + "\"");
//设置压缩流:直接写入response,实现边压缩边下载
ZipOutputStream zipos = null;
try {
zipos = new ZipOutputStream(new BufferedOutputStream(response.getOutputStream()));
zipos.setMethod(ZipOutputStream.DEFLATED); //设置压缩方法
} catch (Exception e) {
e.printStackTrace();
}
//循环将文件写入压缩流
DataOutputStream os = null;
for (String filePath : filepathList) {
//文件路径
File file = new File(filePath);
if (!file.exists()) {
throw new CustomMessageException("文件已不存在");
} else {
try {
//添加ZipEntry,并ZipEntry中写入文件流
String fileName = file.getName();
zipos.putNextEntry(new ZipEntry(fileName));
os = new DataOutputStream(zipos);
InputStream is = new FileInputStream(file);
byte[] b = new byte[100];
int length = 0;
while ((length = is.read(b)) != -1) {
os.write(b, 0, length);
}
is.close();
zipos.closeEntry();
} catch (IOException e) {
e.printStackTrace();
}
}
}
//关闭流
try {
os.flush();
os.close();
zipos.close();
} catch (IOException e) {
e.printStackTrace();
}
return response;
}