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<packaging>war</packaging>
    <dependencies>
        <!--        json rely on  @RequestBody It may be used -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.12.1</version>
        </dependency>

        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!-- Database driven -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </dependency>
        <!--  Database connection pool   druid-->
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.29</version>
        </dependency>
<!--         Paging plug-ins -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>

        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!--        spring Integrate mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

        <!-- SpringMVC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.1</version>
        </dependency>
        <!--    spring The object manager class is in this dependency , Although with mybatis But you still need to import this dependency     spring -jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.1</version>
        </dependency>
        <!--  journal  -->
                <dependency>
                    <groupId>ch.qos.logback</groupId>
                    <artifactId>logback-classic</artifactId>
                    <version>1.2.3</version>
                </dependency>
       
        <!-- ServletAPI -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/jsp-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
<!--         File upload dependency   File download does not need -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
            <scope>runtime</scope>
        </dependency>


    </dependencies>

Two . The configuration file

1.web.xml

notes ： Coding filter and front-end controller must have , The rest is just the convenience of realizing some functions .

<?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">
<!--     Set the encoding filter    Get before get request , Getting after a request is meaningless -->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
<!--             Custom encoding -->
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
<!--  Requests and responses are filtered -->
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
<!--    Filter for handling requests  -->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
<!--     To configure springMVC Front end controller for -->
    <servlet>
        <servlet-name>SpringMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--     Initialize parameters   Set up springMVC Location and name of -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
<!--         take DispatcherServlet Initialization is advanced until the server starts -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
<!--     To configure spring The monitor for    effect   Is loaded when the server starts spring Configuration file for   load ioc Containers -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
<!-- Set up spring Self defined location and name -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-mybatis.xml</param-value>
    </context-param>

</web-app>

2.springmvc.xml

notes ： The view parser and scanner must have , The rest depends on whether you need

jsp and themleaf A view parser is different . Other configurations are the same

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


    <!--     Scanner -->
    <context:component-scan base-package="top.remained.controller">
 </context:component-scan>

    <!--  View parser object  -->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--     Open access to static resources -->
    <mvc:default-servlet-handler/>
    <!--     When you open the top, you must open this   Turn on mvc Annotation driven    
 First use DispatcherServlet analysis , If you can't resolve it, give it to the default servlet-->
    <mvc:annotation-driven/>
    <!--    web-INF  Not accessible through browser or redirection   No location name   Because it will be parsed by the following view parser -->
<!--     Configure view controller -->
<!--    <mvc:view-controller path="/" view-name="index"/>-->
<!--     Profile upload parser  id Fix -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>



</beans>

3.spring-mybatis.xml

notes ： Most configurations are mybatis What's inside （IOC）, The reason why the scanning component removes the control layer is ,springmvc It's been scanned , Yes, but not necessarily

The process

1. load jdbc.property
<context:property-placeholder location="classpath:jdbc.properties"/>
2. To configure datasource With bean In the form of <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
3. To configure sql factory With bean In the form of <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
then sql factory Inside property Including the configured data source to ref="dataSource" <property name="dataSource" ref="dataSource"/> Reload property mybatis Configuration file for <property name="configLocation" value="classpath:mybatis.xml"/>
Scan annotation package <context:component-scan base-package="top.remained"/>
scanning mapper The package is automatically injected @AutoWired
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="top.remained.mapper"> </property>

<?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:tx="http://www.springframework.org/schema/tx"
       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/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
                <!-- Scan components （ Remove control layer ）-->
        <context:component-scan base-package="top.remained">
            <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        </context:component-scan>
<!--     Import database configuration file -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
<!--         Configure data sources -->
        <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
            <property name="driverClassName" value="${jdbc.driver}"/>
            <property name="url" value="${jdbc.url}"/>
            <property name="username" value="${jdbc.user}"/>
            <property name="password" value="${jdbc.pwd}"/>
        </bean>
<!--     Configure transaction manager   The action faces the section -->
        <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"/>
        </bean>
<!--     Turn on annotation driven for transactions   Annotations will be used @Transactional Identify the way or all methods in the class to manage transactions -->
        <tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
<!--     You don't have to set it id  Because I didn't create the object myself   Can be directly in spring Of ioc In order to get SqlSessionFactory object -->
<!--     Put in mybatis All the configurations inside are configured by attributes , You don't have to mybatis The configuration file -->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="typeAliasesPackage" value="top.remained.pojo"/>
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis.xml"/>
 <!--         If   The package where the mapping file is located and resources The package name inside is the same , You don't have to set it -->
<!--         No, MapperScannerConfigurer This bean when   This is different, no matter what   All to set -->
<!--        <property name="mapperLocations" value="classpath:top/remained/mapper/*.xml"/>-->
     </bean>
<!--     The scan is mapper Interface    After configuring this  spring Can pass ioc Automatic assembly of completely take over mapper Interface -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="top.remained.mapper"/>
    </bean>
</beans>

4.mybatis.xml

notes ：mybatis Why is there only one paging plug-in , Because in spring-mybatis It has been configured ,

Paging plug-ins It can also be in spring-mybatis It's equipped with , In this case spring-mybatis You don't have to load

mybatis.xml This file , But I feel troublesome . Paging plug-ins can also be configured without

<?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>
<!--    Configure paging plug-ins -->
   <plugins>
      <plugin interceptor="com.github.pagehelper.PageInterceptor"/>
   </plugins>
</configuration>

5.jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost/ssm?serverTimezone=UTC
jdbc.user=root
jdbc.pwd=123456

6.log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
        <param name="Encoding" value="UTF-8"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS}
%m (%F:%L) \n"/>
        </layout>
    </appender>
    <logger name="java.sql">
        <level value="debug"/>
    </logger>
    <!--    name  Is the scope of -->
    <!--    level Is the level FATAL( deadly )>ERROR( error )>WARN( Warning )>INFO( Information )>DEBUG( debugging )-->
    <logger name="org.apache.ibatis">
        <level value="info"/>
    </logger>
    <root>
        <level value="debug"/>
        <appender-ref ref="STDOUT"/>
    </root>
</log4j:configuration>

3、 ... and . test

1.UserController.java

@Controller
public class UserController {
    @RequestMapping("/")
    public String index(){
//         Unable to obtain employee information directly , Because you need to get the number of page numbers and pass them to web

        return "index";
    }

2.index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>
<head>
    <title>Title</title>
</head>
<body>
《success》
<a href="/findAllUser"> Query user information </a>
</body>
</html>

3. result

4. The results of checking users can also come out

Four . Some mistakes

1. Pay attention to this, pay attention to this ！！！（ If there is a lack of cleanup, repack ）

2. There was no wrong configuration before

Error creating bean with name 'xxxBizImpl': Unsatisfied dependency expressed through field 'xxxMapper';

understand
Use bean Tag creation SqlSessionFactory object , Inject DataSource data Equivalent to the bottom layer has been created SqlSession object hand Spring management
Use bean Tag creation MapperConfigurer object , For scanning dao package , hand Spring management
spring The bottom layer has been created SqlSession object hand Spring management So if you're mybatis It's equipped with
<mappers>
<package name="top.remained.mapper"/>
</mappers>
Is it a little redundant , And in mybatis This is configured inside , We need to manually create sqlSession object Isn't it unnecessary
So in spring Just configure this inside

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="top.remained.mapper"> </property>
</bean>

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本文为[Xinyou - Lin Xi]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/209/202207282206553569.html