crud增删改查-定制异常信息

package com.demo.springbootweb.controller; import java.util.Collection; import java.util.Map; import javax.servlet.http.HttpSession; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; 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.bind.annotation.RestController; import com.demo.springbootweb.dao.DepartmentDao; import com.demo.springbootweb.dao.EmployeeDao; import com.demo.springbootweb.entity.Department; import com.demo.springbootweb.entity.Employee; import com.demo.springbootweb.exception.UserNotExistException; @Controller @RequestMapping(value="/user") public class UserController { @Autowired EmployeeDao employeeDao; @Autowired DepartmentDao departmentDao; // 在Rest风格中可以这么写 //@GetMapping //@DeleteMapping //@PutMapping //@PostMapping(value="/user/login") @RequestMapping(value="login", method = RequestMethod.POST) public String login(String username, String password, Map<String, Object> map, HttpSession session){ if("admin".equals(username) && "123".equals(password)){ //return "dashboard"; session.setAttribute("loginUser", username); /** * 登录成功，防止表单重复提交，可以重定向某个路径信息， * 这个路径是不存在的，通过路径映射现次设置相关的页面路径 */ return "redirect:/main"; } map.put("msg", "登录失败"); return "index"; } /** * 员工列表页面 * @param map * @return */ @RequestMapping(value="emps", method = RequestMethod.GET) public String list(Map<String, Object> map){ Collection<Employee> all = employeeDao.getAll(); map.put("emps", all); return "emp/list"; } /** * 员工添加页面 * @param map * @return */ @RequestMapping(value="emp", method = RequestMethod.GET) public String add(Map<String, Object> map){ Collection<Department> departments = departmentDao.getDepartments(); map.put("deps", departments); return "emp/add"; } /** * 提交添加员工 * SpringMVC自动将请求参数和入参对象的属性进行一一绑定 * @param employee * @return */ @RequestMapping(value="emp", method = RequestMethod.POST) //@PostMapping(value="emp") public String save(Employee employee){ employeeDao.save(employee); // 请求员工列表页面,"/"代表当前项目路径 return "redirect:/user/emps"; // 第一种方式：通过重定向一个地址，请求emps //return "forward:/user/emps";// 第二种方式：通过转发一个地址 } /** * 保存修改员工 * @param employee * @return */ //@PutMapping(value="emp") @RequestMapping(value="uemp", method = {RequestMethod.PUT, RequestMethod.POST}) public String updateEmp(Employee employee){ System.out.println("---------------------- employee= " + employee); employeeDao.save(employee); return "redirect:/user/emps"; } /** * 删除员工信息 * @param id * @return */ //@PostMapping(value="delemp/{id}") //@DeleteMapping(value="emp/{id}") @RequestMapping(value="emp/{id}", method = {RequestMethod.POST, RequestMethod.DELETE}) public String delEmp(@PathVariable("id") Integer id){ employeeDao.delete(id); return "redirect:/user/emps"; } /** * 修改员工页面 * @param id 员工ID * @return */ @RequestMapping(value="emp/{id}", method = RequestMethod.GET) public String emp(@PathVariable("id") Integer id, Map<String, Object> map){ Employee employee = employeeDao.get(id); Collection<Department> departments = departmentDao.getDepartments(); map.put("deps", departments); map.put("emp", employee); return "emp/add"; } @ResponseBody @RequestMapping(value="u", method = RequestMethod.GET) public String getEmp(String name){ if("u".equals(name)){ throw new UserNotExistException(); } return "getEmp"; } }