maven详解-(8)多模块工程

怼烎@ 2022-06-06 00:39 226阅读 0赞

这一篇介绍maven创建多模块工程，融合了maven的融合和继承，本篇只做案例展示，不做理论分析。

# 1.项目介绍 #

创建maven project工程：maven-parent；  
创建maven module工程：maven-entity，maven-service，maven-dao，maven-web。  
说明：maven-web类型为webapp，maven-parent，maven-entity，maven-service，maven-dao类型为quickstart。  
maven-dao，maven-service，maven-web依赖于maven-entity；  
maven-web依赖于maven-service；  
maven-service依赖于maven-dao；

# 2.创建项目 #

![这里写图片描述][SouthEast]

# 3.配置依赖 #

maven-dao的pom.xml文件添加maven-entity依赖

![这里写图片描述][SouthEast 1]

maven-service的pom.xml文件添加maven-dao和maven-entity依赖

![这里写图片描述][SouthEast 2]

maven-web的pom.xml文件添加maven-service和maven-entity依赖

![这里写图片描述][SouthEast 3]

# 4.多模块实现功能 #

maven-entity工程创建javabean

package org.maven.entity;
    
    public class UserInfo { 
        private int id;
        private String userName;
        private String cellPhone;
        private String email;
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getUserName() {
            return userName;
        }
        public void setUserName(String userName) {
            this.userName = userName;
        }
        public String getCellPhone() {
            return cellPhone;
        }
        public void setCellPhone(String cellPhone) {
            this.cellPhone = cellPhone;
        }
        public String getEmail() {
            return email;
        }
        public void setEmail(String email) {
            this.email = email;
        }
        public String toString() {
            return "UserInfo [id=" + id + ", userName=" + userName + ", cellPhone="
                    + cellPhone + ", email=" + email + "]";
        }
    }

maven-dao工程新建查询方法

package org.maven.dao;
    
    import org.maven.entity.UserInfo;
    
    public class UserDao { 
    
        public UserInfo getUserInfoById(int id){
    
            UserInfo userInfo = new UserInfo();
    
            userInfo.setId(1);
            userInfo.setUserName("leilei");
            userInfo.setCellPhone("185****4210");
            userInfo.setEmail("bestjinyi@163.com");
    
            return userInfo;
        }
    }

maven-service工程新建查询方法引用maven-dao层查询方法

package org.maven.service;
    
    import org.maven.dao.UserDao;
    import org.maven.entity.UserInfo;
    
    public class UserService { 
    
        public UserInfo getUserInfoById(int id){
    
            UserDao userDao = new UserDao();
    
            UserInfo userInfo = userDao.getUserInfoById(id);
    
            return userInfo;
        }
    }

maven-web工程新建查询方法引用maven-service层查询方法

package org.maven.controller;
    
    import org.maven.entity.UserInfo;
    import org.maven.service.UserService;
    
    public class UserController { 
    
        public UserInfo getUserInfoById(){
    
            UserService userService = new UserService();
            UserInfo userInfo = userService.getUserInfoById(1);
    
            return userInfo;
        }
    }

maven-web工程index.jsp页面编辑，打印信息

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" import="org.maven.entity.UserInfo ,org.maven.controller.UserController" %>
    <!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>index</title>
    <% UserController uh = new UserController(); UserInfo userInfo = uh.getUserInfoById(); out.println(userInfo); %>
    </head>
    <body>
    
    </body>
    </html>

# 5.运行多模块工程 #

启动maven-web工程，访问maven-web工程的index.jsp页面查看打印信息。

![这里写图片描述][SouthEast 4]

运行成功

[SouthEast]: /images/20220606/d250430058ba4773a7fe2dfacfdf439f.png
[SouthEast 1]: /images/20220606/3a2eaba80fd04444b33e6bb5da0bad61.png
[SouthEast 2]: /images/20220606/c629a227f23746f5bba0c9fb16e42615.png
[SouthEast 3]: /images/20220606/08dc0774bd884d1d880023e417bed93c.png
[SouthEast 4]: /images/20220606/16a891995a8945ed9df822a8d8ecb081.png