SpringMVC架构入门

package org.ksea.controller; import java.io.File; import java.io.IOException; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.apache.commons.io.FileUtils; import org.ksea.dao.UserDao; import org.ksea.exception.UserExcetion; import org.ksea.model.User; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.validation.BindingResult; import org.springframework.validation.annotation.Validated; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; @Controller @RequestMapping({ "/user" }) public class UserController { //查询用户列表信息 @RequestMapping(value={ "/users" },method=RequestMethod.GET) public String queryUsers(Model model) { UserDao userDao = new UserDao(); List<User> users = userDao.queryUserList(); model.addAttribute("users", users); return "user/userlist"; } //根据用户名查询用户 @RequestMapping(value={"/{username}/queryUser"},method=RequestMethod.GET) public String queryUser(@PathVariable String username,Model model){ UserDao userDao= new UserDao(); User user= userDao.queryUserByUserName(username); model.addAttribute("user", user); return "user/detailUser"; } //用该方法说明SpringMvC中返回json数据 @RequestMapping(value={"/{username}/queryUser1"},method=RequestMethod.GET,produces="application/json") @ResponseBody public User queryUser(@PathVariable String username){ UserDao userDao= new UserDao(); User user= userDao.queryUserByUserName(username); return user; } //添加用户、跳转添加用户界面 @RequestMapping(value={"/add"},method=RequestMethod.GET) public String add(Model model){ User user= new User(); model.addAttribute("user", user); return "user/addUser"; } /** //执行添加用户操作Save //单文件操作 @RequestMapping(value={"/add"},method=RequestMethod.POST) //注明：此处上传MultipartFile attach通过传参获取文件, //SpringMVC中form标签没有提供,只能通过input,其attach与input中name值必须一直 //controller配置文件还需配置CommonsMultipartResolver的bean public String add(@Validated User user, BindingResult br,MultipartFile attach,HttpServletRequest request){ //注意在验证之后@Validated必须紧紧跟着BindingResult 他们两个中间不能有别的或者或编译不通过 if(br.hasErrors()) return "user/addUser"; //attach.getName()获取的值就是MultipartFile的属性也就是attach //attach.getOriginalFilename()文件原始名称,也就是您上传文件的文件名 //attach.getContentType() 上传文件类型 //获取文件上传路径 String realPath=request.getSession().getServletContext().getRealPath("/resources/upload"); File file= new File(realPath+"/"+attach.getOriginalFilename()); try { //上传文件 FileUtils.copyInputStreamToFile(attach.getInputStream(), file); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } UserDao userDao= new UserDao(); userDao.addUser(user); return "redirect:/user/users"; }*/ //以上单文件上传仅供参考 //执行添加用户操作Save //多文件同时上传 @RequestMapping(value={"/add"},method=RequestMethod.POST) public String add( @Validated User user, BindingResult br, @RequestParam("attachs") MultipartFile[] attachs, HttpServletRequest request){ if(br.hasErrors()) return "user/addUser"; String realPath=request.getSession().getServletContext().getRealPath("/resources/upload"); try { //循环上传多个文件 for (int i = 0; i < attachs.length; i++) { //如果上传的文件不存在,跳过不执行 if(attachs[i].isEmpty()) continue; File file= new File(realPath+"/"+attachs[i].getOriginalFilename()); FileUtils.copyInputStreamToFile(attachs[i].getInputStream(), file); //注意这里只处理了单个文件的保存,多文件保存,根据情况而定 user.setFilename(attachs[i].getOriginalFilename()); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } UserDao userDao= new UserDao(); userDao.addUser(user); return "redirect:/user/users"; } //下载 @RequestMapping(value={"{filename}/downloadFile"},method=RequestMethod.GET) public String downloadFile(@PathVariable String filename){ System.out.println(filename); return "redirect:/user/users"; } //更新用户信息、根据用户id查询之后、跳转到用户更新界面 @RequestMapping(value={"{uid}/updateUser"},method=RequestMethod.GET) public String updateUser(@PathVariable String uid,Model model){ UserDao userDao= new UserDao(); User user=userDao.queryUserByUid(uid); model.addAttribute("user", user); return "user/updateUser"; } //执行更新用户信息操作 @RequestMapping(value={"{uid}/updateUser"},method=RequestMethod.POST) public String updateUser(@Validated User user,BindingResult br){ if(br.hasErrors()) return "user/updateUser"; UserDao userDao= new UserDao(); userDao.updateUser(user); return "redirect:/user/users"; } //根据用户ID执行删除操作 @RequestMapping(value={"{uid}/deleteUser"},method=RequestMethod.GET) public String deleteUser(@PathVariable String uid){ UserDao userDao= new UserDao(); userDao.deleteUser(uid); return "redirect:/user/users"; } //执行跳转到登录界面 @RequestMapping(value={"/login"},method=RequestMethod.GET) public String login(Model model){ model.addAttribute("user", new User()); return "user/login"; } @RequestMapping(value={"/login"},method=RequestMethod.POST) //保存sesion的值直接将session传递在参数中即可 public String login(User user,HttpSession session) throws UserExcetion{ User u=null; UserDao userDao= new UserDao(); u= userDao.login(user); if(null==u){ throw new UserExcetion("用户名与密码不匹配!"); } //此处登录成功 session.setAttribute("user", u); return "redirect:/user/users"; } //局部异常处理、只能处理对应Controller中的异常,全局异常见SpringMVC中全局异常处理 /** @ExceptionHandler(value={UserExcetion.class}) public String handlerException(UserExcetion userExcetion,HttpServletRequest request){ request.setAttribute("e", userExcetion); return "user/error"; }*/ }