spring 集成 mybatis的实例详解

 环境配置

1>先创建maven的quickstart项目;并且创建dao层,service层,controller层,po层,mapper,resources以及下面的配置文件(db.properties,log4j.properties,mybatis.xml,spring.xml).

2>配置pom.xml

​ 修改jdk版本;

​ 添加依赖:

​ junit版本改为4.12;spring-context;spring-test;spring-jdbc;spring-tx(事务);aspectjweaver(切面编程);c3p0(连接池);mybatis;mybatis-spring;mysql-connector-java(mysql驱动包);slf4j-log4j12,slf4j-api(日志打印);

​ 设置资源目录和插件

 <build>
 <!--
  maven 项目:如果源代码(src/main/java)存在xml、properties、tld 等文件
  maven 默认不会自动编译该文件到输出目录,如果要编译源代码中xml properties tld 等文件
  需要显式配置 resources 标签
 -->
 <resources>
  <resource>
  <directory>src/main/resources</directory>
  </resource>
  <resource>
  <directory>src/main/java</directory>
  <includes>
   <include>**/*.xml</include>
   <include>**/*.properties</include>
   <include>**/*.tld</include>
  </includes>
  <filtering>false</filtering>
  </resource>
 </resources>
 </build>

3>配置spring.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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
  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/aop
  http://www.springframework.org/schema/aop/spring-aop.xsd
  http://www.springframework.org/schema/tx
  http://www.springframework.org/schema/tx/spring-tx.xsd">
  <!-- 扫描基本包 -->
  <context:component-scan base-package="com.xxxx" />

  <!-- 加载properties 配置文件 -->
  <context:property-placeholder location="classpath:db.properties" />

  <!-- aop -->
  <aop:aspectj-autoproxy />

  <!-- 配置c3p0 数据源 -->
  <bean id="datasource" class="com.mchange.v2.c3p0.combopooleddatasource">
    <property name="driverclass" value="${jdbc.driver}"></property>
    <property name="jdbcurl" value="${jdbc.url}"></property>
    <property name="user" value="${jdbc.username}"></property>
    <property name="password" value="${jdbc.password}"></property>
  </bean>

  <!-- 配置事务管理器 -->
  <bean id="txmanager"
     class="org.springframework.jdbc.datasource.datasourcetransactionmanager">
    <property name="datasource" ref="datasource"></property>
  </bean>

  <!-- 设置事物增强 -->
  <tx:advice id="txadvice" transaction-manager="txmanager">
    <tx:attributes>
      <tx:method name="add*" propagation="required" />
      <tx:method name="insert*" propagation="required" />
      <tx:method name="update*" propagation="required" />
      <tx:method name="delete*" propagation="required" />
    </tx:attributes>
  </tx:advice>

  <!-- aop 切面配置 -->
  <aop:config>
    <aop:pointcut id="servicepointcut" expression="execution(* com.xxxx.service..*.*(..))" />
    <aop:advisor advice-ref="txadvice" pointcut-ref="servicepointcut" />
  </aop:config>

  <!-- 配置 sqlsessionfactory -->
  <bean id="sqlsessionfactory" class="org.mybatis.spring.sqlsessionfactorybean">
    <property name="datasource" ref="datasource"></property>
    <property name="configlocation" value="classpath:mybatis.xml" />
    <property name="mapperlocations" value="classpath:com/xxxx/mapper/*.xml" />
  </bean>

  <!-- 配置扫描器 -->
  <bean id="mapperscanner" class="org.mybatis.spring.mapper.mapperscannerconfigurer">
    <!-- 扫描com.xxxx.dao这个包以及它的子包下的所有映射接口类 -->
    <property name="basepackage" value="com.xxxx.dao" />
    <property name="sqlsessionfactorybeanname" value="sqlsessionfactory" />
  </bean>
</beans>

4>配置 mybatis.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>
 <!-- 定义类别名 -->
 <typealiases>
  <package name="com.xxxx.po"/>
 </typealiases>
</configuration>

5>配置 db.properties

jdbc.url中?前面的spring_mybatis是数据库名字,注意要修改下

password是密码,也是要修改下的

6>添加日志

jdbc.driver=com.mysql.cj.jdbc.driver
jdbc.url=jdbc:mysql://localhost:3306/spring_mybatis?
useunicode=true&characterencoding=utf8&servertimezone=gmt%2b8&usessl=false
jdbc.username=root
jdbc.password=root 

log4j.properties

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

添加源代码

1>在po 包下创建 javabean 文件 user.java

public class user {
 private integer userid;
 private string username;
 private string userpwd;
 private string useremail;
 private date createdate;
 private date updatedate;
 
 /**
  set get tostring 方法省略
 **/
}

2>在dao层添加userdao接口

public interface userdao {
 user queryuserbyuserid(integer userid);
}

3>在mapper包添加usermapper.xml 映射文件

sql代码写在这地方

<?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.xxxx.dao.userdao">
  <select id="queryuserbyuserid" parametertype="int"
resulttype="com.xxxx.po.user">
   select user_id as userid,user_name as username,user_pwd as userpwd
   from tb_user
   where user_id = #{userid}
  </select>
</mapper>

4>添加 userservice.java

@service
public class userservice {
 @autowired
 private userdao userdao;
 public user queryuserbyuserid(integer userid){
  return userdao.queryuserbyuserid(userid);
 }
}

5>添加 usercontroller.java

@controller
public class usercontroller {
 // 注入userservice
 @resource
 private userservice userservice;
 /**
 * 通过用户id查询用户对象
 * @param userid
 * @return
 */
 public user queryuserbyuserid(integer userid) {
  user user = userservice.queryuserbyuserid(userid);
  return user;
 }
}

执行测试

public class app {
 public static void main(string[] args) {
  // 加载spring的配置
  beanfactory factory = new classpathxmlapplicationcontext("spring.xml");
  // 得到usercontroller对象
  usercontroller usercontroller = (usercontroller)
factory.getbean("usercontroller");
  // 调用方法
  user user = usercontroller.queryuserbyuserid(1);
system.out.println(user.tostring());
 }
}

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