java动态生成excel打包下载

@SuppressWarnings("unchecked")
public String batchExport() throws DBException{

@SuppressWarnings("unused")
List chkList = this.checkValueToList();//获取复选框的值
List srcfile=new ArrayList();

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHSS");
String path = sdf.format(new Date());

String serverPath = request.getSession().getServletContext().getRealPath("/");
//在服务器端创建文件夹
File file = new File(serverPath+path);
if(!file.exists()){
file.mkdir();
}

for (int i = 0; i < chkList.size(); i++ ){
String t[] = chkList.get(i).split("\\|");
LhjcOrgSelfQuery lhjcunioncheckquery = new LhjcOrgSelfQuery();
lhjcunioncheckquery.setChnoticeId(t[0]);
lhjcunioncheckquery.setOrgId(t[1]);
lhjcunioncheckquery.setSelfChTempId(t[2]);
List> reportViews=commonService.getObjectPages("ExportLhjcunioncheckresultReportView", lhjcunioncheckquery);
String orgName = (String)commonService.get2Object("getUnioncheckOrgName", t[1]);
//生成excel的名字
String templateName = nyear+"深圳市党政机关信息安全检查结果-"+(orgName==null?"未知单位":orgName);

String[] headArray = new String[]{"编码","检查项名称","   检查内容   ","考核类型","   检查结果   ","   备注   ","权重","得分"};

String[] fieldArray = new String[]{"CHECKITEMCODE","CHITEMNAME","CHCONTENT","REPORTTYPE","QUESTDESC","CHITEMDESC","REPORTWEIGHT","UNIONSCORE"};

ExportUtils exportUtils = new ExportUtils();
exportUtils.setTitle(templateName);
exportUtils.setHead(templateName);
exportUtils.setHeadArray(headArray);
exportUtils.setFieldArray(fieldArray);
try {
HttpServletResponse response = ServletActionContext.getResponse();

SimpleDateFormat sfm = new SimpleDateFormat("yyyy-MM-dd");
String filename = templateName + "_" + sfm.format(new Date());

String encodedfileName = new String(filename.getBytes(), "GBK");
//将生成的多个excel放到服务器的指定的文件夹中
FileOutputStream out = new FileOutputStream(serverPath+path+"\"+encodedfileName+".xls");

if(fileType.indexOf(",") != -1){
fileType = StringUtils.substringBefore(fileType, ",");
}
response.setHeader("Content-Disposition", " filename="" + encodedfileName + "." + fileType + """);

//导出excel
if ("xls".equals(fileType) || "xlsx".equals(fileType)) {
exportUtils.exportExcel(reportViews,fileType,out);
} else if("doc".equals(fileType) || "docx".equals(fileType)){
exportUtils.exportWord(reportViews, fileType, out);
} else if("pdf".equals(fileType)){
exportUtils.exportPdf(reportViews, out);
}

srcfile.add(new File(serverPath+path+"\"+encodedfileName+".xls"));

} catch (Exception e) {
e.printStackTrace();
}
}
//将服务器上存放Excel的文件夹打成zip包
File zipfile = new File(serverPath+path+".zip");
this.zipFiles(srcfile, zipfile);
//弹出下载框供用户下载
this.downFile(ServletActionContext.getResponse(),serverPath, path+".zip");
return null;
}

public void zipFiles(List srcfile, File zipfile) {
byte[] buf = new byte[1024];
try {
// Create the ZIP file
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipfile));
// Compress the files
for (int i = 0; i < srcfile.size(); i++) {
File file = srcfile.get(i);
FileInputStream in = new FileInputStream(file);
// Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(file.getName()));
// Transfer bytes from the file to the ZIP file
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
// Complete the entry
out.closeEntry();
in.close();
}
// Complete the ZIP file
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}

public void downFile(HttpServletResponse response,String serverPath, String str) {
try {
String path = serverPath + str;
File file = new File(path);
if (file.exists()) {
InputStream ins = new FileInputStream(path);
BufferedInputStream bins = new BufferedInputStream(ins);// 放到缓冲流里面
OutputStream outs = response.getOutputStream();// 获取文件输出IO流
BufferedOutputStream bouts = new BufferedOutputStream(outs);
response.setContentType("application/x-download");// 设置response内容的类型
response.setHeader(
"Content-disposition",
"attachment;filename="
+ URLEncoder.encode(str, "GBK"));// 设置头部信息
int bytesRead = 0;
byte[] buffer = new byte[8192];
//开始向网络传输文件流
while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {
bouts.write(buffer, 0, bytesRead);
}
bouts.flush();// 这里一定要调用flush()方法
ins.close();
bins.close();
outs.close();
bouts.close();
} else {
response.sendRedirect("../error.jsp");
}
} catch (IOException e) {
e.printStackTrace();
}
}