Basic construction of SSM framework

Preface ： Whether working or studying , We often need to build our own project framework , College students or beginners often encounter unknown mistakes , Waste time on this , Now let's talk about SSM Framework construction and basic use , Whether to use IDEA still Eclipse , maven Project built ssm Same frame structure , The following example uses IDEA Create .

 1.IEAD Use Maven Create project

As shown in the figure below , According to the prompt next

reminder , Please make sure your computer is installed maven And configured environment variables , It is best to configure Alibaba image acceleration .

The project directory is as follows ：

We need to add some configuration ,ssm The basic configuration of the is as follows ：

2. To configure SSM frame

2.1 pom.xml Add required jar package

  <!--web mvc what is needed jar-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.1.1.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>com.google.code.gson</groupId>
      <artifactId>gson</artifactId>
      <version>2.8.0</version>
    </dependency>
    <!--jackson-->
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.8</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.9.8</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.8</version>
    </dependency>
    <!--
     spring-mvc
     -->

    <!--
        database  spring And mybatis Integration required jar
       -->
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.35</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.1</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.1</version>
    </dependency>
    <dependency>
      <groupId>com.zaxxer</groupId>
      <artifactId>HikariCP</artifactId>
      <version>2.7.7</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.0.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.1</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper -->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.1.2</version>
    </dependency>

    <!--
          database  spring And mybatis Integration required jar
         -->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-api</artifactId>
      <version>2.0.2</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-core</artifactId>
      <version>2.0.2</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-web</artifactId>
      <version>2.0.2</version>
    </dependency>

    <!-- Spring AOP  section   modular  -->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>5.0.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
      <version>1.9.2</version>
    </dependency>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.9.2</version>
    </dependency>

    <!--
     test 
    -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>4.3.14.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

2.2 web.xml

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <servlet>
    <servlet-name>DispatcherServlet</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>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>DispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

2.3 spring-mybatis-mysql.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:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--  Read multiple configuration files into the container , hand Spring management  -->
    <bean id="propertyConfigurer"
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <!--  Multiple addressing modes are supported here ：classpath and file -->
                <value>classpath:db.properties</value>
            </list>
        </property>
    </bean>
    <bean id="dataSource" class="com.zaxxer.hikari.HikariDataSource">
        <property name="username" value="${user}"/>
        <property name="password" value="${password}"/>
        <property name="driverClassName" value="${driverClassName}"/>
        <property name="jdbcUrl" value="${jdbcUrl}"/>
        <!--  When connecting to a read-only database, it is configured as true,  Keep it safe  -->
        <property name="readOnly" value="false" />
        <!--  The maximum length of time to wait for the connection pool to allocate the connection （ millisecond ）, Connections that have not been available for more than this period of time occur SQLException,  default :30 second  -->
        <property name="connectionTimeout" value="30000" />
        <!--  A connection idle The maximum duration of a state （ millisecond ）, Timeout is released （retired）, default :10 minute  -->
        <property name="idleTimeout" value="600000" />
        <!--  A connected life span （ millisecond ）, Time out and not used is released （retired）, default :30 minute , It is recommended to set the timeout less than the database 30 second , Reference resources MySQL
            wait_timeout Parameters （show variables like '%timeout%';） -->
        <property name="maxLifetime" value="1800000" />
        <!--  The maximum number of connections allowed in the connection pool . The default value ：10; Recommended formula ：((core_count * 2) + effective_spindle_count) -->
        <property name="maximumPoolSize" value="60" />
        <property name="minimumIdle" value="10" />
    </bean>
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="mapperLocations" value="classpath:mapper/*.xml" />
         <!-- Note other configurations -->
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <!-- Use the following method to configure parameters , Configure one... Line by line  -->
                        <value>
                            rowBoundsWithCount=true
                            PageRowBounds=true
                            offsetAsPageNum=true
                            pageSizeZero=true
                            reasonable=true
                        </value>
                    </property>
                </bean>
            </array>
        </property>
        <property name="configLocation" value="classpath:mybatis_configer.xml"></property><!--  To configure mybatis Logging of  -->

    </bean>
    <!-- Scan dependency injection correlation interface -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.dao"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
</beans>

2.4 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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:task="http://www.springframework.org/schema/task"
       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 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">
    <!--  Enable spring mvc  annotation  -->
    <import resource="spring-mybatis-mysql.xml"/>

    <context:component-scan base-package="com"/>
    <!--  Open annotation mode  -->
    <context:annotation-config />
    <mvc:annotation-driven/>
    <mvc:default-servlet-handler/>  <!-- Access settings for static resources -->


    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

The directory structure is as follows ：

Control layer interface ：

    @RequestMapping(value = "/getSqlList")
    @ResponseBody
    public void faff(){
        System.out.println("----------------------mysql---------------------------");
        List<Map<String, Object>> maps = userMapper.getAll2222();
        maps.forEach(t-> System.out.println(t));
    }

  Page effects will not be repeated , The effect of data request is as follows ：

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