SSM最基础项目搭建

SSM最基础项目搭建

一、Mybatis（持久层：连接数据库操作数据）

1、创建数据库：新建一个数据库并添加表单，表单字段与后期java对象的属性一一对应

 

2、创建一个最基础的idea Maven项目

基本项目包含两个最基本操作

• 安装依赖

必要依赖有：

junit

数据驱动

连接池

servlet

jsp

mybatis

mybatis-spring

spring

<!--依赖-->
<!--包括：junit，数据驱动，连接池，servlet，jsp，mybatis，mybatis-spring，spring-->
    <dependencies>
        <!-- Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--数据库连接池-->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <!--Servlet - JSP-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
         <!--spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
         <!--Lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
    </dependencies>

 

• 静态资源导出

<!--静态资源导出-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

3、连接数据库

 

4、构建基本包结构

 

5、添加必要配置文件

mybatis.xml配置

<?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>

    <!--配置数据源，交给spring去做-->

 

 <typeAliases>

     <package name="com.kuang.pojo"/>

 </typeAliases>

</configuration>

 

applicationContext.xm（spring）l配置

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

<beans xmlns="http://www.springframework.org/schema/beans"

       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">

</beans>

 

配置数据库连接文件datadases.properties

jdbc.driver=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=Utf8

jdbc.username=root

jdbc.password=326278

 

创建实体类：类名与数据库表单一致，属性与字段一致

安装了lombok插件后只有添加引用就会自动生成对应函数

package com.kuang.pojo;

 

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.NoArgsConstructor;

 

@Data

@AllArgsConstructor

@NoArgsConstructor

public class Books {

    private int bookID;

    private String bookName;

    private int bookCounts;

    private String detail;

}

 

创建接口类：在其中实现实体类中定义的方法

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

<!DOCTYPE mapper

        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"

        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<!--一个mapper对应一个接口-->

<mapper namespace="com.kuang.dao.BookMapper">

    <insert id="addBook" parameterType="Books">

        insert into ssmbuild.books (bookID, bookName, bookCounts, detail)

         values (#{bookID},#{bookName},#{bookCounts},#{detail});

    </insert>

 

    <delete id="deleteBookById" parameterType="int">

        delete from ssmbuild.books where bookID = #{bookId}

    </delete>

 

    <update id="updateBookById" parameterType="Books">

        update ssmbuild.books

        set bookName = #{bookName},bookCounts=#{bookCounts},detail=#{detail}

        where bookID=#{bookID};

    </update>

 

    <select id="queryBookById" resultType="Books">

        select * from ssmbuild.books where bookID= #{bookId}

    </select>

 

    <select id="queryAllBook" resultType="Books">

        select * from ssmbuild.books

    </select>

</mapper>

 

定义完接口后马上在配置文件中做绑定

<?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>
   <!--配置数据源，交给spring去做-->
    
    <typeAliases>
        <package name="com.kuang.pojo"/>
    </typeAliases>

    <mappers>
        <mapper class="com.kuang.dao.BookMapper"/>
    </mappers>
</configuration>

 

定义业务层接口，并编写实现实体类

务层接口BookService

package com.kuang.service;

 

import com.kuang.pojo.Books;

import org.apache.ibatis.annotations.Param;

 

import java.util.List;

 

public interface BookService {

    //增加一本书

    int addBook(Books books);

    //    删除一本书

    int deleteBookById(int id);

    //    更新一本书

    int updateBookById(Books books);

    //    查找一本书

    Books queryBookById(int id);

    //    查找所有书

    List<Books> queryAllBook();

}

 

实现实体类BookServicelmpl

//接口实现快捷键1.alt + shift + p；2.alt + insert

 

import com.kuang.dao.BookMapper;

import com.kuang.pojo.Books;

 

import java.util.List;

 

public class BookServicelmpl  implements BookService {

 

//    业务层service调用dao层

    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper){

        this.bookMapper=bookMapper;

    }

    public int addBook(Books books) {

        return bookMapper.addBook(books);

    }

 

    public int deleteBookById(int id) {

        return bookMapper.deleteBookById(id);

    }

 

    public int updateBookById(Books books) {

        return bookMapper.updateBookById(books);

    }

 

    public Books queryBookById(int id) {

        return bookMapper.queryBookById(id);

    }

 

    public List<Books> queryAllBook() {

        return bookMapper.queryAllBook();

    }

}

 

二、spring（业务层：处理数据）

 1、首先创建配置文件：spring-dao.xml

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       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">

</beans>
在配置文件中添加如下步骤

 

• 1、关联配置文件

<context:property-placeholder location="classpath:datadase.properties"/>

 固定格式：将context关联到datadase.properties文件

• 2、配置连接池

<!--    连接池
dbcp：半自动化操作,不能自动连接
c3p0:自动化操作（自动化的加载配置文件，并且可以自动设置到对象中
druid:实际项目应用较多
hikari:spring2之后的版本用
-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        //连接池最基本的四个配置
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

• 3、sqlSessionFactory配置：注入数据源、绑定配置文件

<!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
<!--        绑定Mybatis的配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

• 4、把dao注入到spring

<!--配置dao接口扫描包，动态实现dao接口可以注入到spring容器
手动方式可在dao接口类下创建同名实体类，在实体类中添加实现所有接口方法
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <!--注入sqlSessionFactory-->
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    <!--配置要扫描的dao包:kuang.dao包中的所有接口自动实现、动态注入-->
    <property name="basePackage" value="com.kuang.dao"/>

</bean>

 2、创建配置文件：spring-service.xml

在idea中将配置文件选择放在同一应用程序环境中可实现自动关联直接引用，否则需手动设置引用

 手动方式

 配置文件：spring-service.xml

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       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">
<!--    扫描service下的包-->
    <context:component-scan base-package="com.kuang.service"/>

<!--    将所有业务类注入spring，可以通过配置或注解实现-->
    <bean id="bookServiceImpl" class="com.kuang.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
<!--    声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--        注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
</beans>
到这里spring的IOC控制反转方式整合、实现各种类、接口的基本操作就完成了
三、spring-mvc（表现层）

 其中jsp目录是后添加的

2、编写web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--DispatchServlet-->
    <servlet>
        <servlet-name>springmvc</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>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--过滤乱码-->
    <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>
    <!--Session过期时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

3、添加配置文件spring-mvc.xml

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

<!--注解驱动-->
    <mvc:annotation-driven/>
<!--    静态资源过滤-->
    <mvc:default-servlet-handler/>
<!--    扫描包：controller-->
    <context:component-scan base-package="com.kuang.controller"/>
<!--    视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp?"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

最基础的三层架构SSM项目搭建完成