MVC controller层传递参数到前端页面

方法一： 使用Model类，以key-value的形式传递一些简单的参数（示例为springboot项目中的方法，springboot默认的前端页面文件类型为HTML，位于 /项目名/src/main/resources/templates 下）

 注意：return的内容不要以“/”开头，若以“/”开头，在eclipse中能被视图解析器正常解释，但部署之后就不一定了，要注意一些细节规范。

 //controller类中的方法
String bContent(Model model){
......
model.addAttribute("name", getUser().getName());
model.addAttribute("username", getUser().getUsername());
return "yearvacation/user/list";
}

方法二：使用 ModelAndView类，与方法一类似

public ModelAndView save( ) throws IOException {
.....
ModelAndView mv = new ModelAndView();
mv.addObject("CorrectNum", correctNum);
mv.addObject("MisNum", misNum);
mv.setViewName("vacation/input/input");
return mv;
}

注意：方法的返回值为null，因为如果跳转到其他页面会在eclipse上报错OutputStream has already been called.虽然不影响正常使用但总归是 不太好的。

//根据map参数来生成合适的下载内容，并回传
String download(HttpServletRequest req, HttpServletResponse rep, @RequestParam Map<String, Object> params)
throws IOException {
List<UserDO> warnlist = userService.warnlist(params);
DownloadUtil.downloadAbuseInfo(req, rep, warnlist);
return null;
}

/根据前端传递过来的map参数获得实体类user的list
public List<UserDO> warnlist(Map<String, Object> query) {
List<UserDO> list = userMapper.listAll(query);
List<UserDO> warnlist = new ArrayList<>();
for (UserDO user : list) {
// 获取其到年底累积的年假时长
float vacation = CacuYearVacation.preaccum(user.getWorkstart());
// 获取其有效特批假期时长
String username = user.getUsername();
List<SpecialyvDO> splist = SpecialyvMapper.selectByName(username);
Float sum = 0.0F;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
for (SpecialyvDO sp : splist) {
Date expire;
try {
expire = sdf.parse(sp.getExpiredate());
if (expire.after(new Date())) {
Float l = Float.parseFloat(sp.getSpelong());
sum += l;
}

//引入poi包中HSSF类将list类型的参数转换为excel表格并返回给rep以达到下载的目的。
public static String downloadAbuseInfo(HttpServletRequest req, HttpServletResponse rep, List<UserDO> yvList)
throws IOException {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("超额人员名单");
HSSFRow row1 = sheet.createRow(0);
String[] colname = {  "工号", "姓名", "部门", "超额使用年假时长（小时）" };
for (int i = 0; i < colname.length; i++) {
HSSFCell cell = row1.createCell(i);
cell.setCellValue(colname[i]);
}
int index = 1;
for (UserDO yv : yvList) {
HSSFRow row = sheet.createRow(index);
index++;
String userid = yv.getUsername();
HSSFCell cell1 = row.createCell(0);
cell1.setCellValue(userid);
String name = yv.getName();
HSSFCell cell2 = row.createCell(1);
cell2.setCellValue(name);
String deptname = yv.getDeptName();
HSSFCell cell3 = row.createCell(2);
cell3.setCellValue(deptname);
Float startdate = yv.getYearvacationleft();
HSSFCell cell4 = row.createCell(3);
cell4.setCellValue(startdate);
}
String fileName = "超额年休人员名单.xls";
OutputStream os = getdownloadstream(req, rep, fileName);
try {
wb.write(os);
os.close();
wb.close();
} catch (Exception e) {
// TODO: handle exception
return "fail";
}
finally {
if (os != null)
os.close();
if (wb != null)
wb.close();
}
return "sucess";
}
//识别request,然后对response进行一些设置以使其可以用来下载文件
public static OutputStream getdownloadstream(HttpServletRequest req, HttpServletResponse rep, String fileName)
throws IOException {
rep.setContentType("multipart/form-data");
//根据浏览器类型不同来对文件名进行编码，因为火狐有点特别
String userAgent = req.getHeader("User-Agent");
if (userAgent.toLowerCase().indexOf("firefox") > 0) {
fileName = "=?UTF-8?B?" + (new String(Base64.encodeBase64(fileName.getBytes("UTF-8")))) + "?=";
} else {
fileName = URLEncoder.encode(fileName, "UTF-8");
}
//System.out.println(fileName);
rep.setHeader("Content-Disposition", "attachment;fileName=" + fileName);
rep.setHeader("Cache-control", "must-revalidate,post-check=0,pre-check=0");
rep.setHeader("Pragma", "public");
rep.setDateHeader("expires", (System.currentTimeMillis() + 1000));
OutputStream os = rep.getOutputStream();
return os;
}

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