■ Validator : org.springframework.validation.Validator 인터페이스는 객체를 검증할 때 사용
◆ Validator 인터페이스의 메서드
|
boolean supports(Class<?> clazz) |
Validator가 해당 클래스에 대한 값 검증을 지원하는 지의 여부를 리턴 |
|
void validate(Object target, Errors errors) |
target 객체에 대한 검증을 실행. 검증 결과에 문제가 있을 경우 errors 객체에 에러 정보 저장 |
◆ 커맨드 객체에 검증코드 추가 방법
● @RequestMapping 어노테이션 메서드에서 커맨드 객체 다음 파라미터로 BindingResult 타입이나 Errors 타입의 파라미터 추가
● 메서드 내에서 Validator 객체를 생성 후 validate() 메서드에 커맨드 객체와 BindingResult 또는 Errors 타입의 파라미터를 전달
● Errors.hasErrors() 메서드를 이용해서 에러가 존재하는 지 확인하고, 에러가 존재할 경우 알맞은 처리를 수행
UserVO.java
|
package sp.mvc.vo;
public class UserVO {
private String userName;
private String address;
private String fruit;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getFruit() {
return fruit;
}
public void setFruit(String fruit) {
this.fruit = fruit;
}
@Override
public String toString() {
return "UserVO [userName=" + userName + ", address=" + address + ", fruit=" + fruit + "]";
}
} |
UserVoValidator.java
|
package sp.mvc.validator;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import sp.mvc.vo.UserVO;
public class UserVoValidator implements Validator {
@Override
public boolean supports(Class<?> clazz) {
// TODO Auto-generated method stub
System.out.println("--- UserVoValidator.supports() ---");
return UserVO.class.isAssignableFrom(clazz);
}
@Override
public void validate(Object target, Errors errors) {
// TODO Auto-generated method stub
System.out.println("--- UserVoValidator.validate() ---");
UserVO userVo = (UserVO)target;
if(userVo.getUserName() == null || userVo.getUserName().trim().isEmpty()){
errors.rejectValue("id", "required");
}
if(userVo.getAddress() == null || userVo.getAddress().trim().isEmpty()){
errors.rejectValue("address", "required");
}
}
} |
UserController.java
|
package sp.mvc.controller;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import sp.mvc.validator.UserVoValidator;
import sp.mvc.vo.UserVO;
@Controller
@RequestMapping("/userForm.sp")
public class UserController {
@ModelAttribute("userVo")
public UserVO initForm(HttpServletRequest req){
System.out.println("---- @ModelAttribute ----");
if(req.getMethod().equalsIgnoreCase("GET")){
System.out.println("---- @ModelAttribute : GET ----");
UserVO userVo = new UserVO();
userVo.setUserName("input name");
userVo.setAddress("input address");
userVo.setFruit("input fruit");
return userVo;
}else{
System.out.println("---- @ModelAttribute : POST ----");
return new UserVO();
}
}
@RequestMapping(method=RequestMethod.GET)
public String userForm(){
System.out.println("---- UserController.userForm() ----");
return "user/userForm";
}
@RequestMapping(method=RequestMethod.POST)
public String userSave(@ModelAttribute("userVo") UserVO userVo, BindingResult result){
System.out.println("---- UserController.userSave() ----");
System.out.println("userInfo : " + userVo.toString());
UserVoValidator userVoValidator = new UserVoValidator();
userVoValidator.validate(userVo, result);
if(result.hasErrors()){
System.out.println("---- validator : " + result.getErrorCount()+ "개 errors ----");
//다시 GET 방식으로 호출
return "redirect:/userForm.sp";
}
System.out.println("---- validator : no errors ----");
return "user/userInfo";
}
} |
main_config.xml
userForm.jsp
|
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>회원정보 입력</title>
</head>
<body>
<form action="userForm.sp" method="post">
<table border="1">
<tr>
<td>이름</td>
<td><input type="text" name="userName" value="${userVo.userName}"/></td>
</tr>
<tr>
<td>주소</td>
<td><input type="text" name="address" value="${userVo.address}"/></td>
</tr>
</table>
<input type="submit" name="submit" value="전송"/>
</form>
</body>
</html> |
userInfo.jsp
|
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>회원정보 출력</title>
</head>
<body>
<table border="1">
<tr>
<td>이름</td>
<td>${userVo.userName}</td>
</tr>
<tr>
<td>주소</td>
<td>${userVo.address}</td>
</tr>
</table>
</body>
</html> |
결과 - [에러가 없는 경우]
|
요청 URL
http://localhost:8090/spring303/userForm.sp
---- @ModelAttribute ----
---- @ModelAttribute : GET ----
---- UserController.userForm() ----
---- @ModelAttribute ----
---- @ModelAttribute : POST ----
---- UserController.userSave() ----
userInfo : UserVO [userName=스누피, address=제주도 321, fruit=null]
--- UserVoValidator.validate() ---
---- validator : no errors ---- |
결과 - [에러가 존재하는 경우]
|
요청 URL
http://localhost:8090/spring303/userForm.sp
---- @ModelAttribute ----
---- @ModelAttribute : GET ----
---- UserController.userForm() ----
---- @ModelAttribute ----
---- @ModelAttribute : POST ----
---- UserController.userSave() ----
userInfo : UserVO [userName=스누피, address=, fruit=null]
--- UserVoValidator.validate() ---
---- validator : 1개 errors ----
---- @ModelAttribute ----
---- @ModelAttribute : GET ----
---- UserController.userForm() ---- |
[참고자료] Spring 3.0 프로그래밍-최범균