idea中构建maven web项目并整合sm

猫头虎

发布于 2024-04-07 15:26:07

720

发布于 2024-04-07 15:26:07

文章被收录于专栏：用户11053981的专栏用户11053981的专栏

IDEA

idea

1.为什么是它?

详情

2 idea的下载

? 访问官方网站: https://www.jetbrains.com/idea/ 点击download下载链接

2.3 idea的安装

注意:安装之前请安装jdk至少在1.8以后

? idea的安装非常简单,直接双击安装工具在出现界面中一直下一步等待安装完成即可。

3.Idea的基本使用

3.1 项目管理方式的不同

? idea的项目管理方式与eclipse不同，采用模块管理。在原来的Eclipse中workspace是工作空间，workspace中是用来管理一个一个项目（Project）。在idea中没有workspace概念，而是先是（Project），然后再Project中可以创建多个module。顾名思义：在idea中Project就是原来Eclipse中的workspace，而idea中module就相当于原来的项目（project）。这一点在我们学习idea使用过程中很重要！

3.2 idea中创建项目空间

*4(重要) idea中Eclipse快捷键适配(推荐)

修改方法如下：

点击文件菜单(File) –> 点击设置(Settings… Ctrl+Alt+S), –> 打开设置对话框。

在左侧的导航框中点击 KeyMap 选择 Eclipse。接着在右边的树型框中选择 Main menu –> Code –> Completion. 接着需要做两件事： ? \1. 移除原来的Cycle Expand Word 的 Alt+/ 快捷键绑定。 ? \2. 在 Basic 上点击右键,去除原来的 Ctrl+空格绑定,然后添加 Alt+/ 快捷键。

然后应用(Apply), OK.

更多详细可查看:IDEA 常用快捷键联合操作汇总篇

5.idea中配置工具包

5.1 配置Tomact到idea中

5.2 解决idea中启动tomcat服务控制台中文乱码问题

解决乱码的方式: -Dfile.encoding=UTF-8

6.idea定制Mybatis配置文件

6.1 配置Config配置文件模板

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    
    <properties resource="jdbc.properties" />
   
    <typeAliases>
        <!-- 设置别名 -->
         <typeAlias type="" alias="User"/> 
    </typeAliases>
    
    <!-- 配置数据库连接的环境 -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
    </environments>
   
    <mappers>
        <!-- 引入Mapper.xml -->    
        <package name=""/>
    </mappers>
</configuration>

6.2 配置Mapper配置文件模板

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="">


</mapper>

方式同上 ?

二. 在idea中构建maven web项目并整合sm

1 引入相关依赖

<!--junit-->
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.11</version>
  <scope>test</scope>
</dependency>


<!--struts2-core依赖-->
<dependency>
  <groupId>org.apache.struts</groupId>
  <artifactId>struts2-core</artifactId>
  <version>2.3.16</version>
</dependency>

<!--引入mybatis核心依赖-->
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.2.8</version>
</dependency>

 <!--引入mysql驱动-->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.38</version>
</dependency>

 <!--引入jstl-->
<dependency>
  <groupId>jstl</groupId>
  <artifactId>jstl</artifactId>
  <version>1.2</version>
</dependency>

2.mybatis相关开发 entity dao service

1>.书写mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>


    <!-- 配置数据库连接的环境 -->
    <environments default="mysql">

        <!--定义oracle开发环境-->
        <environment id="oracle">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.oracle.jdbc.Driver" />
                <property name="url" value="jdbc:oracle:thin:@localhost:1521:xe" />
                <property name="username" value="hr" />
                <property name="password" value="hr" />
            </dataSource>
        </environment>

        <!--定义mysql环境-->
        <environment id="mysql">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/2001" />
                <property name="username" value="root" />
                <property name="password" value="root" />
            </dataSource>
        </environment>


    </environments>



</configuration>

2.开发MybatisUtils

/**
 * mybatis 工具类
 */
public class MybatisUtils {
    private static SqlSessionFactory sqlSessionFactory;
    private static ThreadLocal<SqlSession> t = new ThreadLocal<>();

    static{
        InputStream is = null;
        try {
            is = Resources.getResourceAsStream("mybatis-config.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    /**
     * 返回sqlsession的方法
     * @return
     */
    public static SqlSession getSqlSession(){
        SqlSession sqlSession = t.get();
        if(sqlSession==null){
            sqlSession = sqlSessionFactory.openSession();
            t.set(sqlSession);
        }
        return sqlSession;
    }

    /**
     * 关闭sqlSession
     */
   public static void closeSqlSession(){
        SqlSession sqlSession = t.get();
        if(sqlSession!=null){
            sqlSession.close();
            t.remove();
        }
    }
}

3.测试工具类是否正确

public class TestMybatisUtils {
    public static void main(String[] args) {
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        System.out.println("sqlSession = " + sqlSession);
    }
}

4.建表

create table t_user(
	id varchar(40) primary key,
  name varchar(60),
  age  int(4),
  bir  date
);

5.开发实体类 entity

public class User {
    private String id;
    private String name;
    private Integer age;
    private Date bir;

    //alt + insert

    public User(String id, String name, Integer age, Date bir) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.bir = bir;
    }

    public User() {
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Date getBir() {
        return bir;
    }

    public void setBir(Date bir) {
        this.bir = bir;
    }

    @Override
    public String toString() {
        return "User{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", bir=" + bir +
                '}';
    }
}

6.开发DAO接口

//创建的DAO接口
public interface UserDAO {
    //查询所有
    List<User> findAll();
}

7.开发Mapper配置文件

在resources目录中创建目录一定要使用"" 形式进行目录分割

<!--namespace 对应哪个DAO接口-->
<mapper namespace="com.baizhi.dao.UserDAO">

    <!--查询所有-->
    <select id="findAll" resultType="com.baizhi.entity.User">
        select id,name,age,bir from t_user
    </select>
    
</mapper>

8.注册mapper配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 配置数据库连接的环境 -->
    <environments default="mysql">.....</environments>
  
  
    <!--注册mapper配置文件-->
    <mappers>
        <mapper resource="com/baizhi/mapper/UserDAOMapper.xml"/>
    </mappers>
</configuration>

9.测试DAO

public class TestUserDAO {
    public static void main(String[] args) {

        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserDAO userDAO = sqlSession.getMapper(UserDAO.class);

        //foreach遍历
        /*List<User> users = userDAO.findAll();
        for (User user : users) {
            System.out.println(user);
        }*/
        //lambada
        userDAO.findAll().forEach(user-> System.out.println("user = " + user));

    }
}

10.开发service层

1.接口开发

public interface UserService {

    List<User> findAll();
}

2.实现类开发

public class UserServiceImpl implements UserService {

    @Override
    public List<User> findAll() {
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserDAO userDAO = sqlSession.getMapper(UserDAO.class);
        List<User> users = null;
        try{
            users = userDAO.findAll();
        }finally {
            MybatisUtils.closeSqlSession();
        }
        return users;
    }
}

3.测试业务层

public class TestUserService {
    public static void main(String[] args) {
        UserServiceImpl userService = new UserServiceImpl();
        userService.findAll().forEach(user -> System.out.println("user = " + user));
    }
}

5.strtus2相关开发 controller

1.配置web.xml核心filter

<!--配置struts2核心filter-->

  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

2.引入struts.xml配置文件

注意: struts.xml 必须在项目中src/main/resources根目录中名字必须为 struts.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    
    
</struts>

3.开发控制器

public class UserAction {

    private UserService userService = new UserServiceImpl();

    private List<User> users;//成员变量用来传递数据
    
    //控制器方法用来完成用户查询所有功能
    public String findAll(){
        //1.收集数据
        //2.调用业务方法
       this.users = userService.findAll();
        //3.流程跳转
        return "success";
    }

    //get set方法
    public List<User> getUsers() {
        return users;
    }

    public void setUsers(List<User> users) {
        this.users = users;
    }
}

4.配置Action

<struts>
    <!--包-->
    <package name="user" extends="struts-default" namespace="/user">
        <!--action-->
        <action name="findAll" class="com.libin.action.UserAction" method="findAll">
            <result name="success">/showAll.jsp</result>
        </action>
    </package>
</struts>

6.jsp页面相关开发

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page contentType="text/html; UTF-8" pageEncoding="UTF-8" isELIgnored="false" %>
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>展示用户数据</title>
</head>
<body>

    <h1>遍历用户数据</h1>

    <c:forEach items="${requestScope.users}" var="user">
        ${user.id} -----${user.name}-----${user.age}-----${user.bir} <br>
    </c:forEach>

</body>
</html>

7.部署项目运行

访问: http://localhost:端口号/sm/user/findAll