SSM framework integration

The principle of integration

1. Create a maven-web engineering

Replace web.xml file

<?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">
         
</web-app>         

2. Add dependency

<dependencies>
    <!--spring-webmvc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.15.RELEASE</version>
    </dependency>

    <!--mybatis rely on -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.6</version>
    </dependency>

    <!--mybatis and spring Integration dependency -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.6</version>
    </dependency>

    <!--mysql drive -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.28</version>
    </dependency>

    <!--druid Connection pool dependency -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.2.8</version>
    </dependency>

    <!--lombok rely on -->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.24</version>
    </dependency>
    <!--jackson java Object to json object  @ResponseBody-->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.13.2.2</version>
    </dependency>
    <!--servlet-api rely on -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.15.RELEASE</version>
    </dependency>
<!--    generator The generated code -->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.4.0</version>
    </dependency>
<!--   unit testing -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>compile</scope>
    </dependency>
<!--   Output log -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.25</version>
    </dependency>
  </dependencies>

3. To write spring The configuration file

 <!-- Package scanning -->
    <context:component-scan base-package="com.aaa" />
    <!-- Static resource release -->
    <mvc:default-servlet-handler />
    <!-- Open the annotation -->
    <mvc:annotation-driven/>

    <!-- Data source configuration -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=Asia/Shanghai"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
        <!-- Initialize the number of connections : Evaluate according to the concurrency of your project -->
        <property name="initialSize" value="5"/>
        <!-- The maximum number of connections -->
        <property name="maxActive" value="10"/>
        <!-- Waiting time   In milliseconds -->
        <property name="maxWait" value="3000"/>
    </bean>

    <bean id="sessionFactory"  class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- Set data source -->
        <property name="dataSource" ref="dataSource" />
        <!-- Set up mybatis Path to map file -->
        <property name="mapperLocations" value="classpath:mapper/*.xml" />
    </bean>

    <!-- by dao Interface to generate proxy implementation classes -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.aaa.dao" />
    </bean>

4. To configure web.xml

<servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <!-- When tomcat Create at startup DipatcherServlet  Default when accessing controller Path creation -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

To configure tomcat And start the

 

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.15.RELEASE</version>
    </dependency>

If you start tomcat Problems occur when , So it could be spring Error in configuration file . Import dependence 5455

 <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.15.RELEASE</version>
    </dependency>

5. generator The generated code

(1) Import dependence

    <!-- Code generator generator-->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.4.0</version>
    </dependency>

(2) The configuration file

<generatorConfiguration>
    <!-- Find you. mysql drive jar The location of -->
    <classPathEntry location="E:\idea\repMaven\mysql\mysql-connector-java\8.0.29\mysql-connector-java-8.0.29.jar" />
    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!-- Remove comments -->
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!-- Configuration information of data source -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis?serverTimezone=Asia/Shanghai"
                        userId="root"
                        password="123456">
        </jdbcConnection>

        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!--java Configuration of entity class -->
        <javaModelGenerator targetPackage="com.aaa.entity" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!-- Mapping file configuration -->
        <sqlMapGenerator targetPackage="mapper"  targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!--dao Configuration of data access layer -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.aaa.dao"  targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- Mapping relationship between database tables and entities 
              schema: Database name 
              tableName:  Table name 
              domainObjectName: Entity class name 

              enableUpdateByExample: Whether to generate complex modification operations 
        -->
        <table schema="mybatis" tableName="tbl_user" domainObjectName="User"
               enableUpdateByExample="false" enableSelectByExample="false" enableDeleteByExample="false" enableCountByExample="false">

        </table>

        <table schema="mybatis" tableName="tb_stu" domainObjectName="Student"
               enableUpdateByExample="false" enableSelectByExample="false" enableDeleteByExample="false" enableCountByExample="false">

        </table>

    </context>

</generatorConfiguration>

(3) test

public class Test01 {
    @Test
    public void test01() throws Exception{
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("generator.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
    }
}

6. add to sql journal

  Import these two dependencies

<!--   Output log -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.25</version>
    </dependency>