Spring-SpringMVC-Mybatis整合(适合新手理解)

1.新建项目

（file->new->projrct->maven->next）右键项目添加web依赖

在这里插入图片描述

2.导入依赖

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.company</groupId>
    <artifactId>springMVC-Frame</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!--junit 数据库驱动 连接池 servlet jsp  mybatis mybatis-spring spring-->
        <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>5.1.46</version>
        </dependency>
        <!--连接池-->
        <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>
        <!--jsp-->
        <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>3.4.5</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!--spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.18.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.18.RELEASE</version>
        </dependency>
    </dependencies>

    <!--静态资源导出问题-->
    <build>
        <!--配置打包时不过滤非java文件开始  -->
        <!--说明，在进行模块化开发打jar包时，maven会将非java文件过滤掉，
        xml,properties配置文件等，但是这些文件又是必需的，
        使用此配置可以在打包时将不会过滤这些必需的配置文件。
        -->
        <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>

</project>

3.建项目目录

在这里插入图片描述

4.配置spring核心配置文件

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
        https://www.springframework.org/schema/beans/spring-beans.xsd">
   

</beans>

5.配置mybatis-comfig.xml

-----------mybatis层

<?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-->
    <!--类取别名-->
    <typeAliases>
        <package name="com.company.entity"/>
    </typeAliases>

</configuration>

6.编写实体类，新增用户接口

package com.company.entity;

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

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String sex;
    private String pwd;
}

package com.company.mapper;
import com.company.entity.User;
public interface UserMapper {
    int insert(User user);
}

7.编写userMapper.xml

<?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">
<mapper namespace="com.company.mapper.UserMapper">
    <insert id="insert" parameterType="user">
        insert into user values (#{name},#{sex},#{pwd})
    </insert>

</mapper>

8.将userMapper.xml在mybatis配置文件中注册

<?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-->
    <!--类取别名-->
    <typeAliases>
        <package name="com.company.entity"/>
    </typeAliases>
    
    <!--注册mapper文件-->
    <mappers>
        <mapper resource="mapper/userMapper.xml"/>
    </mappers>

</configuration>

9.编写业务层

UserService UserServiceImpl-------mybatis层结束

package com.company.service;

import com.company.entity.User;

public interface UserService {
   int  addUser(User user);
}

package com.company.service.Impl;

import com.company.entity.User;
import com.company.mapper.UserMapper;
import com.company.service.UserService;

public class UserServiceImpl implements UserService {
    private UserMapper userMapper;
    
    public void setUserMapper(UserMapper userMapper){
        this.userMapper=userMapper;
    }
    public int addUser(User user) {
        return userMapper.insert(user);
    }
}

10.配置------------dao层

数据库配置文件(db.properties)

db.driver:com.mysql.jdbc.Driver
#如果用的mysql8.0+  需要配置时区&serverTimezone=Asia/Shanghai
db.url:jdbc:mysql://localhost:3306/mybatis?userSSL=true&amp;characterEncodeing=UTF-8&amp;useUnicode=true
db.username:root
db.password:nnnn

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

    <!--关联数据库配置文件-->
    <context:property-placeholder location="classpath:config/db.properties"/>

    <!--数据库连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${db.driver}"/>
        <property name="jdbcUrl" value="${db.url"/>
        <property name="user" value="${db.username}"/>
        <property name="password" value="${db.password}"/>

        <!--c3p0私有属性-->
        <!--最大连接数-->
        <property name="maxPoolSize" value="30"/>
        <!--最小连接数-->
        <property name="minPoolSize" value="5"/>
        <!--连接超时时间-->
        <property name="checkoutTimeout" value="10000"/>
    </bean>
    <!--sqlsessionfactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--绑定数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis配文件-->
        <property name="configLocation" value="classpath:config/mybatis-config.xml"/>
    </bean>

    <!--dao接口扫描包-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlsessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--扫描的dao包-->
        <property name="basePackage" value="com.company.mapper"/>
    </bean>
</beans>

11.配置spring-service.xml

-----service层

<?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
        https://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 有注解的话就可以识别-->
    <context:component-scan base-package="com.company.service"/>

    <!--将所有业务类注入spring 可以使用配置或注解（使用@Service /@Autowared）-->
    <bean id="userServiceImpl" class="com.company.service.Impl.UserServiceImpl">
        <property name="userMapper" ref="userMapper"/>
    </bean>

    <!--声明式事务管理-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--aop事务支持-->
</beans>

12.配置web.xml

------配置springMVC

<?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:config/applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!--/ 匹配所有的请求；（不包括.jsp）-->
    <!--/* 匹配所有的请求；（包括.jsp）-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <filter>
        <filter-name>encoding</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>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--session-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

13.配置springMVC.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 http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://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-->
    <context:component-scan base-package="com.company.controller"/>

    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

14.测试

controller:

package com.company.controller;

import com.company.entity.User;
import com.company.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class UserController {
    @Autowired
    private UserService userServiceImpl;

    @RequestMapping("/getUser")
    public String getUser(Model model){
        User user=userServiceImpl.selectUser();
        model.addAttribute("user",user);
        return "hh";
    }
}

service

package com.company.service;

import com.company.entity.User;

public interface UserService {
   int  addUser(User user);
    User selectUser();
}

serviceImpl

package com.company.service.Impl;

import com.company.entity.User;
import com.company.mapper.UserMapper;
import com.company.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;

    public void setUserMapper(UserMapper userMapper){
        this.userMapper=userMapper;
    }
    public int addUser(User user) {
        return userMapper.insert(user);
    }

    public User selectUser() {
        return  userMapper.selectUser();
    }
}

mapper

package com.company.mapper;

import com.company.entity.User;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UserMapper {
    int insert(User user);

    User selectUser();
}

mapper.xml

<?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">
<mapper namespace="com.company.mapper.UserMapper">
    <insert id="insert" parameterType="user">
        insert into user values (#{name},#{sex},#{pwd})
    </insert>

    <select id="selectUser" resultType="user">
        select * from user where id="1"
    </select>
</mapper>

最终目录结构：
在这里插入图片描述
拦截器使用以这篇为基础

原文链接：https://blog.csdn.net/Scar_shy/article/details/115330076