SpringMVC：整合SSM-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_44799103/article/details/129418762

环境要求

IDEA
MySQL5.7.19
Tomcat 8.5.50
Maven 3.3.9

数据库环境

创建一个存放书籍数据的数据库表

CREATE DATABASE `ssmbuild`;

USE `ssmbuild`;

DROP TABLE IF EXISTS `books`;

CREATE TABLE `books` (
	`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书ID',
	`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
	`bookCounts` INT(11) NOT NULL COMMENT '数量',
	`detail` VARCHAR(200) NOT NULL COMMENT '描述',
	KEY `bookID` (`bookID`)
)ENGINE=INNODB DEFAULT CHARSET=utf8

INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`) VALUES
(1,'Python',1,'从入门到入土'),
(2,'ETL',8,'从删库到跑路'),
(3,'DeepLearning',6,'从模型到调参');

创建普通Maven项目

添加Mavenjar包依赖

    <!--依赖：junit，数据库驱动，连接池，Servlet，JSP，mybatis，mybatis-Spring，Spring, aspectjweaver事务织入，lombok-->
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <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>
        <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>
        <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>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.26</version>
        </dependency>
    </dependencies>

静态资源导出问题

    <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>

连接数据库

连接测试

添加数据库

创建包

在这里插入图片描述

创建xml文件

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>

</configuration>

applicationContext.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    
</beans>

mybatis关联数据库【写database.properties】

database.properties

jdbc.driver=com.mysql.jdbc.Driver
# 如果使用MySQL8.0+，需要增加一个时区的配置	&serverTimezone=Asia/Shanghai
jdbc.url=jdbc:mysql://127.0.0.1:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

配置数据源，交给Spring去做
mybatis-config.xml 只做别名和设置

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

创建实体类

package com.mao.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Books {

    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;

}

dao/mapper层写一些接口

BookMapper

package com.mao.mapper;

import com.mao.pojo.Books;

import java.util.List;

public interface BookMapper {
    
    // 增加一本书
    int addBook(Books books);
    
    // 删除一本书
    int deleteBook(int id);
    
    // 更新一本书
    int updateBook(Books books);
    
    // 查询一本书
    Books queryBookById(int id);
    
    // 查询全部书
    List<Books> queryAllBook();
    
}

BookMapper.xml

    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books (bookName, bookCounts, detail) 
        VALUE (#{bookName},#{bookCounts},#{detail});
    </insert>
    
    <delete id="deleteBook" parameterType="int">
        delete from ssmbuild.books where bookID=#{bookId};
    </delete>
    
    <update id="updateBook" parameterType="Books">
        update ssmbuild.books set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where bookID=#{bookID};
    </update>
    
    <select id="queryBookById" parameterType="int" resultType="Books">
        select * from ssmbuild.books
        where bookID=#{bookId};
    </select>
    
    <select id="queryAllBook" resultType="Books">
        select * from ssmbuild.books;
    </select>

将Mapper.xml 绑定到配置文件中

mybatis-config.xml文件中添加

    <mappers>
        <mapper class="com.mao.mapper.BookMapper"/>
    </mappers>

Service层

Service层接口

BookService【对应BookMapper】

package com.mao.service;

import com.mao.pojo.Books;

import java.util.List;

public interface BookService {

    // 增加一本书
    int addBook(Books books);

    // 删除一本书
    int deleteBook(int id);

    // 更新一本书
    int updateBook(Books books);

    // 查询一本书
    Books queryBookById(int id);

    // 查询全部书
    List<Books> queryAllBook();

}

ServiceImpl实现类

Service 调Mapper层【组合Mapper】
bookServiceImpl

package com.mao.service;

import com.mao.mapper.BookMapper;
import com.mao.pojo.Books;

import java.util.List;

public class BookServiceImpl implements BookService {

    // Service 调Mapper层；组合Mapper

    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

    @Override
    public int addBook(Books books) {
        return bookMapper.addBook(books);
    }

    @Override
    public int deleteBook(int id) {
        return bookMapper.deleteBook(id);
    }

    @Override
    public int updateBook(Books books) {
        return bookMapper.updateBook(books);
    }

    @Override
    public Books queryBookById(int id) {
        return bookMapper.queryBookById(id);
    }

    @Override
    public List<Books> queryAllBook() {
        return bookMapper.queryAllBook();
    }
}

以上MyBatis层完成，整合Spring层！！！

spring-mapper.xml文件

关联数据库配置

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

连接池

这里使用c3p0

    <!--2. 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
        hikari
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <property name="autoCommitOnClose" value="false"/>
        <property name="checkoutTimeout" value="10000"/>
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

sqlSessionFactory

    <!--3. 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>

配置dao接口配置扫描包，动态的实现了Dao接口可以注入到Spring容器中。

    <!--4. 配置dao接口扫描包，动态的实现了Dao接口可以注入到Spring容器中。-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--要扫描的dao包-->
        <property name="basePackage" value="com.mao.mapper"/>
    </bean>

spring-service.xml文件

<?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
        https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1. 扫描service下的包-->
    <context:component-scan base-package="com.mao.service"/>

    <!--2. 将我们的所有业务类，注入到Spring，可以通过配置，或者注解实现-->
    <bean id="BookServiceImpl" class="com.mao.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>


    <!--3. 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>

    <!--4. aop事务支持-->


</beans>

以上Spring层完成，整合SpringMVC层！！！

添加web应用支持

web.xml配置

DispatcherServlet
乱码过滤
Session默认超时时间

<?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">

    <!--DispatcherServlet-->
    <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:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <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-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

spring-mvc.xml文件

注解驱动
静态资源过滤
扫描包:controller
视图解析器

<?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"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/cache/spring-mvc.xsd">

    <!--1. 注解驱动-->
    <mvc:annotation-driven/>

    <!--2. 静态资源过滤-->
    <mvc:default-servlet-handler/>
    
    <!--3. 扫描包:controller-->
    <context:component-scan base-package="com.mao.controller"/>
    
    <!--4. 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>