IDEA下搭建maven项目（SSM框架）

package ssm.controller; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import ssm.common.file.FileUtil; import ssm.common.util.Ts; import ssm.constant.Constant; import ssm.model.User; import ssm.service.UserService; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.*; import java.net.URLEncoder; import java.util.Date; import java.util.List; @Controller @RequestMapping("/user") public class UserController { @Resource private UserService service; @RequestMapping("/login") public String login(ModelMap rs, Integer code, User user) { rs.put("code", code); rs.put("mb", user); return "user"; } @RequestMapping("loginSubmit") public String loginSubmit(User user, HttpSession session) { int code = 1; if (Ts.hv(user.getUserName()) && Ts.hv(user.getUserPwd())) { User ps = service.queryByNamePwd(user); if (ps != null) { session.setAttribute(Constant.USER_SESSION, ps); return "redirect:showUser"; } else { // 不存在 code = 2; } } return "redirect:login?code=" + code+"&username="+user.getUserName(); } @RequestMapping("/showUser") public String showUser(Model model) { List<User> user = service.getAllUser(); model.addAttribute("list",user); return "showUser"; } //新增用户 @RequestMapping("/goAddUser") public String goAddUser() { return "addUser"; } @RequestMapping("/addUser") @ResponseBody public String addUser(User user) { user.setCreated(new Date()); user.setUpdated(new Date()); service.addUser(user); return "ok!"; } //删除用户 @RequestMapping("del") @ResponseBody public String delUser(String id) { service.delUser(id); return "ok"; } //跳转上传下载页面 @RequestMapping("/uploadDownload") public String upDownload() { return "UploadDownload"; } //文件上传 @RequestMapping("/upload") public @ResponseBody String upload(MultipartFile file, HttpServletRequest request) throws IOException { String path = request.getSession().getServletContext().getRealPath("upload"); String fileName = file.getOriginalFilename(); File dir = new File("E://",fileName); if(!dir.exists()){ dir.mkdirs(); } System.out.println(file); System.out.println(fileName); //MultipartFile自带的解析方法 file.transferTo(dir); return "ok!"; } //文件下载 @RequestMapping("/download") public void down(HttpServletRequest request,HttpServletResponse response) throws Exception{ //模拟文件，myfile.txt为需要下载的文件 String fileName = "E://"+"C5}I]X9Y$}7KIS}H69IWDR7.png"; //获取输入流 InputStream bis = new BufferedInputStream(new FileInputStream(new File(fileName))); //假如以中文名下载的话 String filename = "img.png"; //转码，免得文件名中文乱码 filename = URLEncoder.encode(filename,"UTF-8"); //设置文件下载头 response.addHeader("Content-Disposition", "attachment;filename=" + filename); //1.设置文件ContentType类型，这样设置，会自动判断下载文件类型 response.setContentType("multipart/form-data"); BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream()); int len = 0; while((len = bis.read()) != -1){ out.write(len); out.flush(); } out.close(); } }