SSM整合所需配置文件及常见配置错误引起的报错

SSM整合的实质，仅仅就是将Mybatis整合入Spring。因为SpringMVC原本就是Spring的一部分，不用专门整合

SSM整合配置文件

1、创建Web工程或Maven-webapp模板

maven使用模板时添加archetypeCatalog=local,因为网络问题可能会失败

2、添加jar包或导入依赖

<dependencies>
    <!-- spring相关 根据依赖传递特性,只需导入webmvc,所依赖的spring其他jar包会被自动导入:aop/beans/context/core/expression/web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.3.16</version>
    </dependency>
    <!--spring-jdbc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.3.16</version>
    </dependency>

    <!-- 日志 -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

    <!--jsp-->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.1</version>
      <scope>provided</scope>
    </dependency>
    <!--jstl-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- ServletAPI -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>

    <!--mysql-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.8</version>
    </dependency>
    <!--数据源-->
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.4</version>
    </dependency>

    <!--mybatis-spring整合-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.7</version>
    </dependency>
    <!--mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.7</version>
    </dependency>
     <!--文件上传和下载-->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>
  </dependencies>

3、配置web.xml文件

 <!--上下文参数 （记录spring文件位置的）-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring_mybatis.xml</param-value>
    </context-param>
    <!-- 监听器(spring文件相关的监听器） -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!--编码过滤器-->
    <filter>
        <filter-name>CharsetEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <!--设置编码格式-->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <!--强制响应编码,默认false-->
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharsetEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--核心控制器servlet DispatcherServlet-->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--配置SpringMVC配置文件的位置和名称-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <!--将前端控制器DispatcherServlet的初始化时间提前到服务器启动时-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!--拦截所有会导致拦截静态资源,需要在mvc文件中设置放行-->
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

4、配置spring_mybatis.xml整合文件

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

    <!--1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    
    <!--2.配置数据源datasource-->
    <bean id="datasource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    
    <!--3.SqlSessionFactoryBean 会话工厂-->
    <bean id="sqlsessionfactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasource"/>
        <!--mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!--maven项目需要将映射文件写在resources中-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>
    
    <!--4.扫描映射器对象 批量实例化Mapper接口-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.zb.mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sqlsessionfactory"/>
    </bean>
</beans>

5、db.properties数据库连接信息

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
jdbc.username=root
jdbc.password=root

6、配置springmvc.xml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 http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">


    <!--扫描组件-->
    <context:component-scan base-package="com.zb"/>
    <!--mvc注解驱动-->
    <mvc:annotation-driven/>
    <!--静态资源配置-->
    <mvc:resources mapping="/statics/**" location="/statics/"/>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--异常处理-->
    <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="RuntimeException">error</prop>
            </props>
        </property>
        <property name="exceptionAttribute" value="ex"/>
    </bean>
    <!--文件上传-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8"/>
        <property name="maxUploadSize" value="-1"/>
    </bean>
</beans>

7、配置mybatis-config.xml文件

<?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>
    
    <settings>
        <!--将下划线自动映射为驼峰,emp_name:empName-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <plugins>
        <!--分页插件-->
        <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>

    <!--typeAliases:设置类型别名-->
    <typeAliases>
        <package name="com.zb.pojo"/>
    </typeAliases>

</configuration>

附:配置错误导致的问题

1、web.xml中没配置监听器

2、web.xml中没配置上下文

3、springmvc.xml没有开启一键式配置

4、未引入spring-jdbc依赖

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘org.mybatis.spring.mapper.MapperScannerConfigurer#0’ defined in class path resource [spring_mybatis.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/springframework/dao/support/DaoSupport

Caused by: java.lang.NoClassDefFoundError: org/springframework/dao/support/DaoSupport

org.apache.catalina.core.StandardContext.startInternal One or more listeners failed to start. Full details will be found in the appropriate container log file
org.apache.catalina.core.StandardContext.startInternal Context [] startup failed due to previous errors