Maven 기반 웹 프로젝트 구성 예시로 사용자 로그인 기능을 구현합니다. 프로젝트 구조는 다음과 같습니다:

pom.xml 설정

<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
                             http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example.webapp</groupId>
  <artifactId>member-web</artifactId>
  <packaging>war</packaging>
  <version>1.0.0</version>

  <properties>
    <spring.version>4.1.7.RELEASE</spring.version>
  </properties>

  <dependencies>
    <!-- Servlet/JSP 지원 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.1</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <!-- Spring Framework -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!-- 사용자 정의 모듈 -->
    <dependency>
      <groupId>com.example.service</groupId>
      <artifactId>member-service</artifactId>
      <version>1.0.0</version>
    </dependency>

    <!-- 테스트 -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <finalName>member-web</finalName>
  </build>
</project>

member-service 모듈은 로컬 저장소에 설치되어야 합니다. member-dao 종속성은 member-service를 통해 전이됩니다.

Spring MVC 설정 (spring-mvc.xml)

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       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.example.web.controller" />

  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/views/" />
    <property name="suffix" value=".jsp" />
  </bean>
</beans>

웹 배포 서술자 (web.xml)

<web-app xmlns="http://java.sun.com/xml/ns/javaee" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
                             http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

  <display-name>member-web</display-name>

  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>

  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>

컨트롤러 구현 (LoginController.java)

package com.example.web.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import com.example.service.MemberService;
import com.example.entity.Member;

@Controller
@RequestMapping("/auth")
public class LoginController {

  private final MemberService memberService;
  
  public LoginController(MemberService memberService) {
    this.memberService = memberService;
  }

  @RequestMapping("/signin")
  public String authenticate(Member member, HttpServletRequest request) {
    Member verified = memberService.verifyCredentials(member);
    if(verified == null) {
      request.setAttribute("member", member);
      request.setAttribute("error", "Invalid credentials");
      return "login";
    }
    HttpSession session = request.getSession();
    session.setAttribute("activeUser", verified);
    return "redirect:/welcome.jsp";
  }
}

로그인 페이지 (login.jsp)

<%@ page contentType="text/html; charset=UTF-8" %>
<html>
<body>
  <form action="${pageContext.request.contextPath}/auth/signin.do" method="post">
    ID: <input type="text" name="userName" value="${member.userName}"/><br>
    PW: <input type="password" name="password"/><br>
    <input type="submit" value="Sign In"/>
    <span style="color:red">${error}</span>
  </form>
</body>
</html>

환영 페이지 (welcome.jsp)

<%@ page contentType="text/html; charset=UTF-8" %>
<html>
<body>
  Welcome: ${activeUser.userName}
</body>
</html>

애플리케이션 실행 후 http://localhost:8080/member-web/login.jsp 접속하여 테스트 가능