form validation 유효성검사 예제

pom.xml에

<!-- validation -->
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>1.0.0.GA</version>
        </dependency>
 
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>4.2.0.Final</version>
        </dependency>

추가

UserController 에 메서드에 @Valid 추가,바인딩 추가, 모델추가

public String join(@ModelAttribute UserVo userVo) {

public String join(
            @ModelAttribute @Valid UserVo userVo,
            BindingResult result,
            Model model) {
        if(result.hasErrors()) {
//            List<ObjectError> list = result.getAllErrors();
//            for(ObjectError error : list) {
//                System.out.println(error);
//            }
            model.addAttribute(result.getModel());
 
            return "user/join";
        }

UserVo에 필요한 유효성검사들 추가

import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotEmpty;
 
public class UserVo {
    private long no;
    @NotEmpty
    @Length(min=2, max=8)
    private String name;
    @NotEmpty
    @Email
    private String email;

default값도 있지만

파일추가후

NotEmpty.userVo.name = \uC774\uB984\uC774 \uBE44\uC5B4 \uC788\uC2B5\uB2C8\uB2E4.
Length.userVo.name = \uC774\uB984\uC774 (2~8)\uAE00\uC790\uAC00 \uB4E4\uC5B4\uAC00\uC57C\uB429\uB2C8\uB2E4
NotEmpty.userVo.email = \uC774\uBA54\uC77C\uC774 \uBE44\uC5B4 \uC788\uC2B5\uB2C8\uB2E4
Email.userVo.email = \uC774\uBA54\uC77C \uD615\uC2DD\uC5D0 \uB9DE\uAC8C \uC785\uB825\uD574\uC8FC\uC138\uC694.

자동 암호화가 됨. - 안될시 윈도우 프로퍼티 텍스트 utf-8로 바꿔줌