◆ @Valid 어노테이션을 사용하기 위해 lib 추가 : 
javax.validation-1.0.0.GA.jar
◆ 스프링 3 MVC는 JSR 303의 @Valid 어노테이션과 스프링 프레임워크의 @InitBinder 어노테이션을 이용해서 Validator에 대한 직접적인 호출없이 스프링 프레임워크가 유효성 검사 코드를 실행하도록 할 수 있음
LoginVO.java
|
package sp.mvc.vo;
public class LoginVO {
private String id;
private String password;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "LoginVO [id=" + id + ", password=" + password + "]";
}
} |
LoginValidator.java
|
package sp.mvc.validator;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;
import sp.mvc.vo.LoginVO;
public class LoginValidator implements Validator {
@Override
public boolean supports(Class<?> cla) {
// TODO Auto-generated method stub
System.out.println("--- LoginValidator.supports() ---");
return LoginVO.class.isAssignableFrom(cla);
}
@Override
public void validate(Object target, Errors errors) {
// TODO Auto-generated method stub
System.out.println("--- LoginValidator.validate() ---");
LoginVO loginVo = (LoginVO)target;
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "id", "required");
if(loginVo.getPassword() == null || loginVo.getPassword().trim().isEmpty()){
errors.rejectValue("password", "password.required");
}
}
} |
LoginController.java
|
package sp.mvc.controller;
import javax.validation.Valid;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import sp.mvc.validator.LoginValidator;
import sp.mvc.vo.LoginVO;
@Controller
@RequestMapping(value="/login.sp")
public class LoginController {
@RequestMapping(method=RequestMethod.GET)
public String form(){
System.out.println("---- form ----");
return "login/loginForm";
}
@RequestMapping(method=RequestMethod.POST)
public String submit(@Valid LoginVO loginVo, BindingResult result, Model model){
System.out.println("login param : " + loginVo.toString());
if(result.hasErrors()){
System.out.println("---- validator count : " + result.getErrorCount() + "개");
//GET
return "redirect:/login.sp";
}
model.addAttribute("loginVo", loginVo);
return "login/loginInfo";
}
@InitBinder
protected void initBinder(WebDataBinder binder){
binder.setValidator(new LoginValidator());
}
} |
● 스프링은 @InitBinder 어노테이션이 적용된 메서드를 이용해서 폼과 커맨드 객체 사이의 매핑을 처리해주는 WebDataBinder를 초기화할 수 있도록 하고 있다. 이 메서드에서 WebDataBinder.setValidator() 메서드를 이용해서 커맨드 객체의 유효성 여부를 검사할 때 사용할 Validator를 설정하게 됨
● submit() 메서드 내부에서 Validator.validate() 메서드를 명시적으로 호출하지 않고 있음
main_config.xml
loginForm.jsp
|
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<!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>로그인</title>
</head>
<body>
<form action="login.sp" method="post">
<table border="1">
<tr>
<td>ID</td>
<td><input type="text" name="id" value=""/></td>
</tr>
<tr>
<td>PW</td>
<td><input type="password" name="password" value=""/></td>
</tr>
</table>
<input type="submit" name="submit" value="전송"/>
</form>
</body>
</html> |
loginInfo.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>로그인</title>
</head>
<body>
${loginVo.id}님 반갑습니다.
</body>
</html> |
결과
|
요청 URL
http://localhost:8090/spring303/login.sp
---- form ----
--- LoginValidator.supports() ---
--- LoginValidator.validate() ---
login param : LoginVO [id=스누피123, password=123aaa]
--- LoginValidator.supports() --- |
[참고자료] Spring 3.0 프로그래밍-최범균