springmvc入门代码项目

package cn.itcast_01_springmvc.controller; import java.io.File; import java.io.IOException; import java.util.Collection; import java.util.Map; import java.util.UUID; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.tomcat.util.codec.binary.StringUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.servlet.ModelAndView; import com.google.gson.Gson; import cn.itcast_01_springmvc.dao.UserDao; import cn.itcast_01_springmvc.exception.LackParamException; import cn.itcast_01_springmvc.pojo.User; //Controller 负责处理由DispatcherServlet 分发的请求，它把用户请求的 //数据经过业务处理层处理之后封装成一个Model ，然后再把该Model 返回给对应的View //进行展示。在SpringMVC 中提供了一个非常简便的定义Controller 的方法，然后 //使用@RequestMapping 和@RequestParam 等一些注解用以定义URL请求和Controller 方法之间的映射，这样的Controller 就能被外界访问到。 @Controller // 这里将user的信息存入session，只将字符存入session，当然可以放在方法上面 // @SessionAttributes(value = { "user" }, types = { String.class }) public class UserController { @Autowired private UserDao userDao; // @RequestMapping(value = "/form") // public String test() { // return "user/form"; // } // // @RequestMapping(value = "/save1") // public String save1(User user) { // System.out.println(user.toString()); // return "home"; // } // // // 将数据传到前台ModelAndView // @RequestMapping(value = "/edit1") // public ModelAndView edit1() { // User user = new User(); // user.setUser("Bob"); // user.setPass("123"); // user.setAge(12); // user.setEmail("123@qq.com"); // Address address = new Address(); // address.setCity("成都"); // address.setProvince("四川"); // user.setAddress(address); // ModelAndView mv = new ModelAndView(); // mv.setViewName("user/form"); // mv.addObject("user", user); // return mv; // } // // // 将数据传到前台Map // @RequestMapping(value = "/edit2") // public String edit2(Map<String, Object> map) { // User user = new User(); // user.setUser("Lisa"); // user.setPass("123"); // user.setAge(12); // user.setEmail("123@qq.com"); // Address address = new Address(); // address.setCity("成都"); // address.setProvince("四川"); // user.setAddress(address); // map.put("user", user); // return "user/form"; // } // // // 将数据传到前台Model // @RequestMapping(value = "/edit3") // public String edit3(Model model) { // User user = new User(); // user.setUser("Lucy"); // user.setPass("123"); // user.setAge(12); // user.setEmail("123@qq.com"); // Address address = new Address(); // address.setCity("成都"); // address.setProvince("四川"); // user.setAddress(address); // model.addAttribute("user", user); // // model.addAttribute("str1", "session1"); // model.addAttribute("str2", "session2"); // return "user/form"; // } /////////////// RESTful/////////////// @RequestMapping(value = "/users", method = RequestMethod.GET) public String list(Model model) { Collection<User> userList = userDao.getAll(); model.addAttribute("userList", userList); System.out.println("users"); //int a=Integer.parseInt("as"); //int b=2/0; // 显示列表页 return "user/list"; } // 保持restful风格，获取资源 @RequestMapping(value = "/user", method = RequestMethod.GET) public String add() { // 打开增加页 return "user/add"; } // 保持restful风格，新建资源 @RequestMapping(value = "/user", method = RequestMethod.POST) public String save(User user) { userDao.save(user); // 执行插入 System.out.println(user); return "redirect:/users"; } @RequestMapping(value = "/user/{id}", method = RequestMethod.DELETE) public String delete(@PathVariable(value = "id") Integer id) throws LackParamException { // 执行删除 userDao.delete(id); return "redirect:/users"; } @RequestMapping(value = "/user/{id}", method = RequestMethod.GET) public String edit(@PathVariable(value = "id") Integer id, Model model){ User users = userDao.get(id); model.addAttribute("users", users); // 打开回显页 return "/user/edit"; } @RequestMapping(value = "/user/{id}", method = RequestMethod.PUT) public String update(@PathVariable(value = "id") Integer id, User users) { users.setId(id); userDao.save(users); // 执行更新 return "redirect:/users"; } @RequestMapping(value = "/saveuser", method = RequestMethod.POST) public String saveUser(User users) { System.out.println(users); userDao.save(users); return "redirect:/users"; } /////////////// json与jsonp/////////////// // @responseBody注解的作用是将controller的方法返回 // 的对象通过适当的转换器转换为指定的格式之后，写入到response对象的body区 @ResponseBody @RequestMapping(value = "/users-json", method = RequestMethod.GET) public Collection<User> listJson() { return userDao.getAll(); } @RequestMapping(value = "/users-jsonp", method = RequestMethod.GET) public void listJsonp(String callback, HttpServletResponse response) throws IOException { Collection<User> list = userDao.getAll(); Gson gson = new Gson(); String json = gson.toJson(list); response.getWriter().println(callback + "(" + json + ")"); } // 通过@requestBody可以将请求体中的JSON字符串绑定到相应的bean上 @RequestMapping(value = "/savejson", method = RequestMethod.POST) public String saveJsonp(@RequestBody User users) throws IOException { System.out.println(users); userDao.save(users); return "redirect:/users"; } /////////////// 异常处理/////////////// //括号内容表示只处理数据转换异常，可以不写则为处理全部异常 //@ExceptionHandler(NumberFormatException.class) //自定义类异常 @ExceptionHandler(LackParamException.class) public ModelAndView handleException(Exception e){ System.out.println(e); ModelAndView mv=new ModelAndView(); mv.setViewName("error"); mv.addObject("exception",e); return mv; } //自定义异常测试 @RequestMapping(value = "/test_exception") public String testException(String str) throws LackParamException { if (org.springframework.util.StringUtils.isEmpty(str)) { throw new LackParamException(); } return "home"; } /////////////// 文件上传/////////////// @RequestMapping(value = "/fileupload") public String fileupload(String desc,MultipartFile file,Model model) throws IllegalStateException, IOException { System.out.println(desc); System.out.println(file); System.out.println(file.getOriginalFilename()); if(file!=null&&file.getOriginalFilename()!=null&&file.getOriginalFilename().length()>0){ String filepath="D:/Project resources/springMVC/"; String origName=file.getOriginalFilename(); //扩展名 String extendsName=origName.substring(origName.lastIndexOf(".")); //文件名 String newFileName=UUID.randomUUID().toString()+extendsName; //文件 File uploadFile=new File(filepath+newFileName); file.transferTo(uploadFile); model.addAttribute("filepath","/file/"+newFileName); } return "success"; } }