Annotation-based Controller

package com.easycompany.controller.annotation;
 
@Controller
public class LoginController {
   ...
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
 
        <context:component-scan base-package="com.easycompany.controller.annotation" />
 
</beans>

@Controller
@RequestMapping("/hello.do")
public class HelloController {
 
    @RequestMapping   //type level에서 URL을 정의하고 Controller에 메소드가 하나만 있어도 요청 처리를 담당할 메소드 위에 @RequestMapping 표기를 해야 제대로 맵핑이 된다.
    public String hello(){
	...		
    }
}

@Controller
public class HelloController {	
 
	@RequestMapping(value="/hello.do")
	public String hello(){
		...
	}
 
	@RequestMapping(value="/helloForm.do", method = RequestMethod.GET)
	public String helloGet(){
		...
	}
 
	@RequestMapping(value="/helloForm.do", method = RequestMethod.POST)
	public String helloPost(){
		...
	}	
}

@Controller
@RequestMapping("/hello.do")
public class HelloController {
 
	@RequestMapping(method = RequestMethod.GET)
	public String helloGet(){
		...
	}
 
	@RequestMapping(method = RequestMethod.POST)
	public String helloPost(){
		...
	}
}

package com.easycompany.controller.annotation;
...
@Controller
public class LoginController {
 
	@Autowired
	private LoginService loginService;
 
	@RequestMapping(value = "/loginProcess.do", method = RequestMethod.POST)
	public String login(HttpServletRequest request) {
 
		String id = request.getParameter("id");
		String password = request.getParameter("password");
 
		Account account = (Account) loginService.authenticate(id,password);
 
		if (account != null) {
			request.getSession().setAttribute("UserAccount", account);
			return "redirect:/employeeList.do";
		} else {
			return "login";
		}
	}	
}

@Controller
...
@RequestMapping(value = "/pets", method = RequestMethod.POST, consumes="application/json")
public void addPet(@RequestBody Pet pet, Model model) {
    // implementation omitted
}

@Controller
...
@RequestMapping(value = "/pets/{petId}", method = RequestMethod.GET, produces="application/json")
@ResponseBody
public Pet getPet(@PathVariable String petId, Model model) 
    // implementation omitted
}

@RequestMapping("/user/view/{id}")
public String view(@PathVariable("id") int id) {
    // implementation omitted
}

@Controller
public class HelloController {
 
    @RequestMapping("/hello.do")
    public String hello(@RequestParam("name") String name, //required 조건이 없으면 기본값은 true, 즉 필수 파라미터 이다. 파라미터 name이 존재하지 않으면 Exception 발생.
			@RequestParam(value="pageNo", required=false) String pageNo){ //파라미터 pageNo가 존재하지 않으면 String pageNo는 null.
	...		
    }
}

package com.easycompany.controller.annotation;
...
@Controller
public class LoginController {
 
	@Autowired
	private LoginService loginService;
 
	@RequestMapping(value = "/loginProcess.do", method = RequestMethod.POST)
	public String login(
			HttpServletRequest request,
			@RequestParam("id") String id,
			@RequestParam("password") String password) {		
 
		Account account = (Account) loginService.authenticate(id,password);
 
		if (account != null) {
			request.getSession().setAttribute("UserAccount", account);
			return "redirect:/employeeList.do";
		} else {
			return "login";
		}
	}
}

...
	@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
	public String formBackingObject(@RequestParam("deptid") String deptid, ModelMap model) {
		Department department = departmentService.getDepartmentInfoById(deptid); //DB에서 부서정보 데이터를 가져온다.
		model.addAttribute("department", department); //데이터를 모델 객체에 저장한다.
		return "modifydepartment";
	}
...

...
	@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
	public String formBackingObject() {
		return "modifydepartment";
	}
 
	@ModelAttribute("department")
	public Department getEmployeeInfo(@RequestParam("deptid") String deptid){
		return departmentService.getDepartmentInfoById(deptid); //DB에서 부서정보 데이터를 가져온다.
	}
	또는
	public @ModelAttribute("department") Department getDepartmentInfoById(@RequestParam("deptid") String deptid){
		return departmentService.getDepartmentInfoById(deptid);
	}
...

...
	@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
	public String formBackingObject(@ModelAttribute("department") Department department) { //department에는 getDepartmentInfo에서 구해온 데이터들이 들어가 있다.
		System.out.println(employee.getEmployeeid());
		System.out.println(employee.getName());
		return "modifydepartment";
	}
 
	@ModelAttribute("department")
	public Department getDepartmentInfo(@RequestParam("deptid") String deptid){
		return departmentService.getDepartmentInfoById(deptid); //DB에서 부서정보 데이터를 가져온다.
	}
...

@RequestMapping(value="/someUrl", method = RequestMethod.POST)
public String onSubmit(@RequestPart("meta-data") MetaData metadata,
                       @RequestPart("file-data") MultipartFile file) {
    // ...
}

   @RequestMapping("/test.do")
   public void test(HttpServletRequest request, @CommandMap Map<String, String> commandMap) {
	//생략
   }

@Controller
public class HelloController {
 
  @RequestMapping("/hello")
  public void hello() {    
    //DataAccessException이 일어날 가능성
  }
     
  // Controller 내부에서 DataAccessException발생시 호출
  @ExceptionHandler(DataAccessException.class)
  public ModelAndView dataAccessExceptionHandler(DataAccessException e) {
    return new ModelAndView("dataexception").addObject("msg", ex.getMessage();
  }
}

@ControllerAdvice
public class CentralControllerHandler {
 
    @ExceptionHandler({EgovBizException.class})
    public ModelAndView handleEgovBizException(EgovBizException ee) {
    //생략
    }
    
    @ExceptionHandler({BaseException.class})
    public ModelAndView handleBaseException(BaseException be) {
    //생략
    }
}

@ControllerAdvice
public class CentralControllerHandler {
 
    @InitBinder
    public void initBinder(WebDataBinder binder) {
    binder.setValidator(new PersonValidator());
    }
 
    //생략
}

@RequestMapping(value="/persons")
public void updatePerson(@Valid Person person, HttpServletRequest request, HttpServletResponse response) {
    personService.updatePerson(person);
    //생략
}

@ControllerAdvice
public class GlobalControllerAdvice {
 
  ... 
 
  @ModelAttribute("model")
  public Model getModel() {
    return this.model();
  }
}

public String updateEmployee(...,@ModelAttribute("employee") Employee employee,			
			BindingResult bindingResult,...) /* (O) */
 
public String updateEmployee(...,BindingResult bindingResult,
                        @ModelAttribute("employee") Employee employee,...) /* (X) */

        @RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
	public ModelAndView formBackingObject(@RequestParam("deptid") String deptid) {
		Department department = departmentService.getDepartmentInfoById(deptid);
		ModelAndView mav = new ModelAndView("modifydepartment");
		mav.addObject("department", department);
		return mav;
	}

	public ModelAndView formBackingObject(@RequestParam("deptid") String deptid, ModelMap model) {
		Department department = departmentService.getDepartmentInfoById(deptid);
		model.addAttribute("department", department);
		ModelAndView mav = new ModelAndView("modifydepartment");
		mav.addAllObjects(model);
		return mav;
	}

	@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
	public Model formBackingObject(@RequestParam("deptid") String deptid, Model model) {
		Department department = departmentService.getDepartmentInfoById(deptid);
		model.addAttribute("department", department);
		return model;
	}

	@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
	public Model formBackingObject(@RequestParam("deptid") String deptid) {
		Department department = departmentService.getDepartmentInfoById(deptid);
		Model model = new ExtendedModelMap();
		model.addAttribute("department", department);
		return model;
	}

	@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
	public Map formBackingObject(@RequestParam("deptid") String deptid) {
		Department department = departmentService.getDepartmentInfoById(deptid);
		Map model = new HashMap();
		model.put("department", department);
		return model;
	}

	@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
	public Map formBackingObject(@RequestParam("deptid") String deptid, Map model) {
		Department department = departmentService.getDepartmentInfoById(deptid);
		model.put("department", department);
		return model;
	}

/* (O) */
@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
public String formBackingObject(@RequestParam("deptid") String deptid, ModelMap model) {
    Department department = departmentService.getDepartmentInfoById(deptid);
    model.addAttribute("department", department);
    return "modifydepartment";
}

/* (X) */
@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
public String formBackingObject(@RequestParam("deptid") String deptid) {
    Department department = departmentService.getDepartmentInfoById(deptid);
    ModelMap model = new ModelMap();
    model.addAttribute("department", department);
    return "modifydepartment";
}

package com.easycompany.controller.hierarchy;
...
 
public class UpdateDepartmentController extends SimpleFormController{
 
	private DepartmentService departmentService;
 
	public void setDepartmentService(DepartmentService departmentService){
		this.departmentService = departmentService;
	}
 
	//상위부서리스트(selectbox)는 부서정보클래스에 없으므로 , 상위부서리스트 데이터를 DB에서 구해서 별도의 참조데이터로 구성한다.
	@Override
	protected Map referenceData(HttpServletRequest request, Object command, Errors errors) throws Exception{
 
		Map referenceMap = new HashMap();
		referenceMap.put("deptInfoOneDepthCategory",departmentService.getDepartmentIdNameList("1"));	//상위부서정보를 가져와서 Map에 담는다.
		return referenceMap;
	}
 
	@Override
	protected Object formBackingObject(HttpServletRequest request) throws Exception {
		if(!isFormSubmission(request)){	// GET 요청이면
			String deptid = request.getParameter("deptid");
			Department department = departmentService.getDepartmentInfoById(deptid);//부서 아이디로 DB를 조회한 결과가 커맨드 객체 반영.
			return department;
		}else{	// POST 요청이면
			//AbstractFormController의 formBackingObject을 호출하면 요청객체의 파라미터와 설정된 커맨드 객체간에 기본적인 데이터 바인딩이 이루어 진다.
			return super.formBackingObject(request);
		}
	}
 
	@Override
	protected ModelAndView onSubmit(HttpServletRequest request,
			HttpServletResponse response, Object command, BindException errors) throws Exception{
 
		Department department = (Department) command;
 
		try {
			departmentService.updateDepartment(department);
		} catch (Exception ex) {
			return showForm(request, response, errors);
		}
 
		return new ModelAndView(getSuccessView(), "department", department);
	}
}

package com.easycompany.controller.annotation;
 
...
@Controller
public class UpdateDepartmentController {
 
	@Autowired
	private DepartmentService departmentService;
 
	//상위부서리스트(selectbox)는 부서정보클래스에 없으므로 , 상위부서리스트 데이터를 DB에서 구해서 별도의 참조데이터로 구성한다.
	@ModelAttribute("deptInfoOneDepthCategory")
	public Map<String, String> referenceData() {
		return departmentService.getDepartmentIdNameList("1");
	}
 
	// 해당 부서번호의 부서정보 데이터를 불러와 입력폼을 채운다
	@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.GET)
	public String formBackingObject(@RequestParam("deptid") String deptid, ModelMap model) {
		Department department = departmentService.getDepartmentInfoById(deptid);
		model.addAttribute("department", department); //form tag의 commandName은 이 attribute name과 일치해야 한다. <form:form commandName="department">.
		return "modifydepartment";
	}
 
	//사용자가 데이터 수정을 끝내고 저장 버튼을 누르면 수정 데이터로 저장을 담당하는 서비스(DB)를 호출한다.
	//저장이 성공하면 부서리스트 페이지로 이동하고 에러가 있으면 다시 입력폼페이지로 이동한다.
	@RequestMapping(value = "/updateDepartment.do", method = RequestMethod.POST)
	public String onSubmit(@ModelAttribute("department") Department department, BindingResult bindingResult) {
 
		//validation code
		new DepartmentValidator().validate(department, bindingResult);		
		if(bindingResult.hasErrors()){
			return "modifydepartment";
		}
 
		try {
			departmentService.updateDepartment(department);
			return "redirect:/departmentList.do?depth=1";
		} catch (Exception e) {
			e.printStackTrace();
			return "modifydepartment";
		}
	}
}