SpringMvc整合MyBatis以及采坑总结

代码实现

先看下项目目录：


pom.xml：

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.gx</groupId>
  <artifactId>Spring_MVC</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>Spring_MVC Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>

    <!--spring 版本号-->
    <spring.version>5.1.6.RELEASE</spring.version>

    <!--mybatis 版本号-->
    <mybatis.version>3.5.1</mybatis.version>




  </properties>

  <dependencies>

    <!--spring 核心包-->
    <!-- spring start -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-oxm</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!-- spring end -->

    <!--mybatis核心包-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <!--日志-->
    <!--<dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.8.0</version>
    </dependency>-->
    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.8.0-alpha0</version>
      <scope>test</scope>
    </dependency>


    <!--j2ee相关包 servlet、jsp、jstl-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <!--mybatis/spring 包-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.0</version>
    </dependency>

    <!--MySQL 驱动包-->
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.16</version>
    </dependency>

    <!--老版本的包
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.47</version>
    </dependency>-->


    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-model</artifactId>
      <version>3.0</version>
    </dependency>

    <!--json的包-->
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.5</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.9.5</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.5</version>
    </dependency>
    <!--json end-->

    <!-- Fastjson插件来处理Java数据与JSON互转 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.9</version>
    </dependency>
    <!--<dependency>
      &lt;!&ndash; 数据源包，此处使用的是阿里巴巴的 &ndash;&gt;
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>${druid.version}</version>
    </dependency>-->
    <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.17</version>
    </dependency>

    <!-- 其他的jar包 -->
    <!--hibernate Validator 包 https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator -->
    <dependency>
      <groupId>org.hibernate.validator</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>6.0.16.Final</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.4</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.6</version>
    </dependency>


  </dependencies>

  <build>
    <finalName>Spring_MVC</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
  <display-name>MyBatis_first</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <!-- 配置关联的Spring的配置文件，项目启动时自动加载该配置文件 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationContext.xml</param-value>
	</context-param>
	<!-- 配置监听 以便加载上面的配置，启动WEB容器是自动装载applicationContext的配置信息，在web.xml配置这个监听信息，启动容器时，就会默认执行实现的方法 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
  <!-- 配置DispatcherServlet -->
  <servlet>
  	<servlet-name>spring-dispatcher</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<!-- 配置Spring MVC需要加载的配置文件 spring-mvc.xml -->
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:springmvc-config.xml</param-value>
  	</init-param>
  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<servlet-name>spring-dispatcher</servlet-name>
  	<url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

db.properties：

db.driverClass=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/wc
db.username=root
db.password=root

applicationContext.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:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd 
">
	<!-- 刚开始也进行如下配置 -->
	<!-- 1.指定扫面的包，该配置会扫描指定的包及其子包下所有的Java类 ，并把匹配的Java类注册成Bean，这样就不需要再Java类中进行实例化操作了-->
	<context:component-scan base-package="com.sdbairui"></context:component-scan>
	<!-- 找到连接数据库属性文件 -->
	<context:property-placeholder location="classpath:db.properties"/>
	<!-- 定义数据源  class="com.mchange.v2.c3p0.ComboPooledDataSource" -->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
		<property name="driverClassName" value="${db.driverClass}"></property>
		<property name="url" value="${db.url}"></property>
		<property name="username" value="${db.username}"></property>
		<property name="password" value="${db.password}"></property>
	</bean>
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource"></property>
		<property name="configLocation" value="classpath:mybatis-config.xml"></property>
	</bean>
	<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
		<constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
	</bean>
	<!-- 扫描basePackage下所有的以@MyBatisDao注解的接口 -->
	<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
		<property name="basePackage" value="com.sdbairui.mapper"></property>
	</bean>
</beans>

mybatis-config.xml：

<?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>
<typeAliases>
	<package name="vo"/>
</typeAliases>
<mappers>
	<mapper resource="com/sdbairui/mapper/EmpMapper.xml"/>
</mappers>
</configuration>

springmvc-config.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:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-2.5.xsd 
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc.xsd
      http://www.springframework.org/schema/aop
      http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!-- 自定义扫描控制器的包 -->
    <context:component-scan base-package="com.sdbairui.controller"></context:component-scan>
    <!-- 定义视图的前缀和后缀 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    	<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/view/" />
        <!-- 后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

EmpMapper.xml：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper 
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.sdbairui.mapper.EmpMapper">
</mapper>

Stu.java：

package com.sdbairui.vo;

public class Stu {
	private String sname;
	private String sex;
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
}

StuService.java：

package com.sdbairui.service;

import java.util.List;

import com.sdbairui.vo.Stu;

public interface StuService {
	List<Stu> findAll();
}

StuDaolmpl.java：

package com.sdbairui.impl;

import java.util.List;


import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.sdbairui.mapper.EmpMapper;
import com.sdbairui.service.StuService;
import com.sdbairui.vo.Stu;
@Service("stuService")
public class StuDAOlmpl implements StuService {
	@Autowired
	private EmpMapper empma;
	@Override
	public List<Stu> findAll() {
		List<Stu> list = empma.findAll();
		return list;
	}
}

EmpMapper.java：

package com.sdbairui.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.mapping.FetchType;

import com.sdbairui.vo.Banji;
import com.sdbairui.vo.Stu;
import com.sdbairui.vo.XueSheng;

public interface EmpMapper {
	//在DAO中定义的抽象方法要和映射文件中的id值匹配起来，映射中的参数就是此处的方法的参数
		@Select(value="select * from stu")
		public List<Stu> findAll();
}

HelloController.java：

package com.sdbairui.controller;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import com.sdbairui.impl.StuDAOlmpl;
import com.sdbairui.service.StuService;
import com.sdbairui.vo.Stu;

@Controller
@RequestMapping("/hello")
public class HelloController {
	@Autowired
	private StuService stuService;
    @RequestMapping("/hehe")
    public String hehe()
    {	
    	List<Stu> list = stuService.findAll();
    	for(Stu stu:list) {
    		System.out.println(stu.getSname());
    	}
        System.out.println(123);
        return "hehe";
    }
}

采坑总结

1、在applicationContext.xml中，base-package所扫描的包要指定到src目录下所有的包，如果这些包没有公共的父包，最好建一个，例如，我在这些包最外面建了一个com.sdbairui包

<context:component-scan base-package=“com.sdbairui”></context:component-scan>

2、启动Tomcat的时候，控制台报错。
Handler dispatch failed; nested exception is java.lang.AbstractMethodError: Receiver class org.mybatis.spring.transaction.SpringManagedTransaction does not define or inherit an implementation of the resolved method abstract getTimeout()Ljava/lang/Integer; of interface org.apache.ibatis.transaction.Transaction.
如果这些报错中你看到到了getTimeout这个字眼，八成就是jar包不兼容的问题。
更换jar包请参考：
https://blog.csdn.net/AirMario/article/details/53446228
https://www.cnblogs.com/beppezhang/p/6118661.html