ssm整合

目录

1.ssm整合的原理

2.创建一个MAVEN-web工程

3.添加依赖

4.编写spring配置文件

5.配置web.xml文件

6.generator生成代码

---

1.ssm整合的原理

2.创建一个MAVEN-web工程

替换web.xml中的文件

<?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>         

3.添加依赖

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

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

    <!--mybatis和spring整合的依赖-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.6</version>
    </dependency>

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

    <!--druid连接池依赖-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.2.1</version>
    </dependency>

    <!--lombok依赖-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.24</version>
    </dependency>
   <!--jackson java对象转换为json对象 @ResponseBody-->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.13.2.2</version>
    </dependency>
        <!--servlet-api依赖-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>

  </dependencies>

4.编写spring配置文件

<?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"
       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">

    <!--包扫描-->
    <context:component-scan base-package="com.ykq"/>
    <!--开启注解-->
    <mvc:annotation-driven/>
    <!--静态资源的放行-->
    <mvc:default-servlet-handler/>


    <!--spring的配置-->
    <!--数据源配置-->
    <bean id="ds" class="com.alibaba.druid.pool.DruidDataSource">
        <!--驱动名称-->
        <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="root"/>
        <!--初始化连接池的个数-->
        <property name="initialSize" value="5"/>
        <!--至少的个数-->
        <property name="minIdle" value="5"/>
        <!--最多的个数-->
        <property name="maxActive" value="10"/>
        <!--最长等待时间单位毫秒-->
        <property name="maxWait" value="3000"/>
    </bean>
    <!--sqlSessionFactory 整合mybatis-->
    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="ds"/>
        <!--设置mybatis映射文件的路径-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>
    <!--为dao接口生成代理实现类-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--为com.ykq.dao包下的接口生成代理实现类-->
        <property name="basePackage" value="com.ykq.dao"/>
    </bean>

</beans>

5.配置web.xml文件

<?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">

    <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>
        <!--当tomcat启动时创建DipatcherServlet 默认当访问controller路径时创建-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

配置tomcat并启动

常见问题:

 解决办法:缺少依赖

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

6.generator生成代码

(1)依赖

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

 (2)配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <!--找到你的mysql驱动jar的位置-->
    <classPathEntry location="D:\repMaven\mysql\mysql-connector-java\8.0.20\mysql-connector-java-8.0.20.jar" />

    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!--抑制注释-->
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!--数据源的配置信息-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis?serverTimezone=Asia/Shanghai"
                        userId="root"
                        password="root">
        </jdbcConnection>

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

        <!--java实体类的配置-->
        <javaModelGenerator targetPackage="com.ykq.entity" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!--映射文件的配置-->
        <sqlMapGenerator targetPackage="mapper"  targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!--dao数据访问层的配置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.ykq.dao"  targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--数据库表和实体的映射关系
              schema:数据库名称
              tableName: 表名
              domainObjectName:实体类名

              enableUpdateByExample:是否生成复杂的修改操作
        -->
        <table schema="mybatis" tableName="tbl_user" domainObjectName="Users"
               enableUpdateByExample="false" enableSelectByExample="false" enableDeleteByExample="false" enableCountByExample="false">

        </table>


    </context>
</generatorConfiguration>

(3)测试

public class TestGeneratory {
    public static void main(String[] args) 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);
    }
}

7.添加sql日志

 <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>


 <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.30</version>
    </dependency>

 log4j.properties-----内容

log4j.rootLogger=DEBUG, Console
#Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

感谢观看!!!!!!!!!!!!!!