不用xml 配置文件，纯粹使用java配置类搭建SSM项目

随着spring版本迭代更新，现在越来越倡导不使用复杂繁琐的配置文件来配置项目，下面介绍纯粹使用java 配置类来配置spring、springmvc、mybatis；

环境：java 8 + maven + IDEA  + mysql

新建maven web项目：（这个就不介绍了，网上一大堆的教程），下面进入正题；

一、项目所需依赖jar

<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.open.ssm</groupId>
  <artifactId>ssm-demo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  
      
      <!-- 版本 -->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <junit.version>4.12</junit.version>
        <spring.version>4.3.0.RELEASE</spring.version>
        <jackson.version>2.5.0</jackson.version>
        <mysql-connector-java.version>5.1.37</mysql-connector-java.version>
        <fastjson.version>1.2.3</fastjson.version>
        <slf4j.version>1.7.12</slf4j.version>
        <commons-io.version>2.4</commons-io.version>
        <commons-fileupload.version>1.3.2</commons-fileupload.version>
        <commons-collections.version>3.2.2</commons-collections.version>
        <commons-lang3.version>3.3.2</commons-lang3.version>
        <commons-codec.version>1.10</commons-codec.version>
        <javax.servlet-api.version>3.1.0</javax.servlet-api.version>
        <druid.version>1.0.16</druid.version>
        <!-- <mybatis.version>3.4.0</mybatis.version>
        <mybatis-spring.version>1.3.0</mybatis-spring.version> -->
        <mybatis-plus.version>2.0.5</mybatis-plus.version>
        <beetl.version>2.7.18</beetl.version>
    </properties>
    
    <!-- 依赖管理 -->
    <dependencies>
       
           <!-- 单元测试 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
        
        <!-- json -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>
        
        <!-- spring start-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</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-web</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-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
            <scope>test</scope>
        </dependency>
        
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--sprint end-->

        <!-- jackson start-->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson.version}</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson.version}</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <!-- jackson end-->


        <!-- jdbc驱动包  -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql-connector-java.version}</version>
        </dependency>
        
        <!--common 组件 start-->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>${commons-io.version}</version>
        </dependency>

        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>${commons-fileupload.version}</version>
        </dependency>
        
        <dependency>
            <groupId>commons-collections</groupId>
            <artifactId>commons-collections</artifactId>
            <version>${commons-collections.version}</version>
        </dependency>
        
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>${commons-lang3.version}</version>
        </dependency>
        
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>${commons-codec.version}</version>
        </dependency>
        <!--common 组件 end-->
        
        <!-- log  -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        
        <!-- servlet start-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>${javax.servlet-api.version}</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!-- servlet end-->

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>
        
        <!-- <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>${mybatis-spring.version}</version>
        </dependency> -->
        
        <dependency>
          <groupId>com.baomidou</groupId>
          <artifactId>mybatis-plus</artifactId>
          <version>${mybatis-plus.version}</version>
        </dependency>
        
        <!-- https://mvnrepository.com/artifact/com.ibeetl/beetl -->
        <dependency>
            <groupId>com.ibeetl</groupId>
            <artifactId>beetl</artifactId>
            <version>${beetl.version}</version>
        </dependency>

        <!--可以不用写 get、set方法-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.12</version>
        </dependency>

      </dependencies>
      
    <build>
        <finalName>ssm-demo</finalName>
        <plugins>
            
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.5</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <configuration>
                    <port>8088</port>
                    <path>/</path>
                </configuration>
            </plugin>
            
        </plugins>
    </build>
</project>

二、在maven项目中新建几个基本包

三、spring配置类

　　1、webconfig 配置类，继承 WebMvcConfigurerAdapter 

package com.study.ssm.config;

import org.beetl.ext.spring.BeetlGroupUtilConfiguration;
import org.beetl.ext.spring.BeetlSpringViewResolver;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternUtils;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;


/**
 * Web Configuration Class
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
@Configuration
@EnableWebMvc
@ComponentScan("com.study.ssm.controller")
public class WebConfig extends WebMvcConfigurerAdapter {
    
    @Bean(initMethod = "init")
    public BeetlGroupUtilConfiguration getBeetlGroupUtilConfiguration() {
        BeetlGroupUtilConfiguration beetlGroupUtilConfiguration = new BeetlGroupUtilConfiguration();
        ResourcePatternResolver patternResolver = ResourcePatternUtils.getResourcePatternResolver(new DefaultResourceLoader());
        beetlGroupUtilConfiguration.setConfigFileResource(patternResolver.getResource("classpath:beetl.properties"));
        return beetlGroupUtilConfiguration;
    }

    @Bean(name = "viewResolver")
    public BeetlSpringViewResolver getBeetlSpringViewResolver() {
        BeetlSpringViewResolver beetlSpringViewResolver = new BeetlSpringViewResolver();
        beetlSpringViewResolver.setContentType("text/html;charset=UTF-8");
        beetlSpringViewResolver.setOrder(0);
        return beetlSpringViewResolver;
    }//静态资源的处理
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
}

　　2、RootConfig 配置类 功能：配置基本的扫描包

package com.study.ssm.config;

import org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

/**
 * Root Configuration Class
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
@Configuration
@ComponentScan(basePackages={ "com.study.ssm.config", "com.study.ssm.repository", "com.study.ssm.service" })public class RootConfig {
    
    @Bean
    public BeanNameAutoProxyCreator proxycreate(){
        BeanNameAutoProxyCreator proxycreate = new BeanNameAutoProxyCreator();
        proxycreate.setProxyTargetClass(true);
        proxycreate.setBeanNames("*ServiceImpl");
        proxycreate.setInterceptorNames("transactionInterceptor");
        return proxycreate;
    }
    
}

　　3、新建 WebAppInitializer类   继承 AbstractAnnotationConfigDispatcherServletInitializer

　　　这里是把刚才写的两个配置类加载进来

package com.study.ssm.config;

import org.apache.log4j.Logger;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;


/**
 * Application gateway and load config class
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

    private final static Logger LOG = Logger.getLogger(WebAppInitializer.class);
    
    @Override
    protected Class<?>[] getRootConfigClasses() {
        LOG.info("------root配置类初始化------");
        return new Class<?>[] { RootConfig.class }; 
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        LOG.info("------web配置类初始化------");
        return new Class<?>[] { WebConfig.class };
    }

    @Override
    protected String[] getServletMappings() {
        LOG.info("------映射根路径初始化------");
        return new String[]{ "/" };//请求路径映射，根路径
    }
    
}

四、新建  beetl.properties  用来配置视图解析器 

　　这个文件的引入是在WebConfig 里面

#classpath 根路径，即模板资源路径
RESOURCE.root=/WEB-INF/view/
#是否检测文件变化,开发用true合适，但线上要改为false
RESOURCE.autoCheck= true

五、加上一个 log4j.properties

### set log levels ###
log4j.rootLogger = INFO , C , D , E 

### console ###
log4j.appender.C = org.apache.log4j.ConsoleAppender
log4j.appender.C.Target = System.out
log4j.appender.C.layout = org.apache.log4j.PatternLayout
log4j.appender.C.layout.ConversionPattern = [ssm-demo][%p] [%-d{yyyy-MM-dd HH:mm:ss}] %C.%M(%L) | %m%n

### log file ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = ../logs/ssm-demo.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = INFO 
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = [ssm-demo][%p] [%-d{yyyy-MM-dd HH:mm:ss}] %C.%M(%L) | %m%n

### exception ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File = ../logs/ssm-demo_error.log 
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR 
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = [ssm-demo][%p] [%-d{yyyy-MM-dd HH:mm:ss}] %C.%M(%L) | %m%n

暂时写一个 indexController  测试一下；

package com.study.ssm.controller;

import java.io.File;
import java.io.IOException;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;
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.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

/**
 * index
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
@Controller
public class IndexController {

    @SuppressWarnings("unused")
    private final static Logger LOG = Logger.getLogger(IndexController.class);
    


    @GetMapping("/index")
    public String index(){
        return "ssm.html";
    }
    
}

记得在WEB-INF 下新建一个view目录，然后随便加一个 ssm.html 文件

启动项目访问 、如果正确访问到ssm.html 则说明配置成功

 注：别忘了install 一下，我之前又一次出错了，怎么都不到原因，最后突然想起来，忘记install了

第二阶段：配置mybatis

一：jdbc.properties

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/zhidevelop
spring.datasource.username=root
spring.datasource.password=root

#连接池配置
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
#连接等待超时时间
spring.datasource.maxWait=60000
#配置隔多久进行一次检测(检测可以关闭的空闲连接)
spring.datasource.timeBetweenEvictionRunsMillis=60000
#配置连接在池中的最小生存时间
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

二、新建 DruidDataSourceConfig 配置类

package com.study.ssm.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.baomidou.mybatisplus.entity.GlobalConfiguration;
import com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean;
import org.apache.log4j.Logger;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.interceptor.TransactionInterceptor;

import javax.sql.DataSource;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Properties;

/**
 * DataSource Configuration Class
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
@Configuration
@PropertySource("classpath:/jdbc.properties")
@MapperScan(basePackages="com.study.ssm.repository")
public class DruidDataSourceConfig {
   
   private final static Logger LOG = Logger.getLogger(DruidDataSourceConfig.class);
   
   @Value("${spring.datasource.url}")  
    private String dbUrl;  
      
    @Value("${spring.datasource.username}")  
    private String username;  
      
    @Value("${spring.datasource.password}")  
    private String password;  
      
    @Value("${spring.datasource.driverClassName}")  
    private String driverClassName;  
      
    @Value("${spring.datasource.initialSize}")  
    private int initialSize;  
      
    @Value("${spring.datasource.minIdle}")  
    private int minIdle;  
      
    @Value("${spring.datasource.maxActive}")  
    private int maxActive;  
      
    @Value("${spring.datasource.maxWait}")  
    private int maxWait;  
      
    @Value("${spring.datasource.timeBetweenEvictionRunsMillis}")  
    private int timeBetweenEvictionRunsMillis;  
      
    @Value("${spring.datasource.minEvictableIdleTimeMillis}")  
    private int minEvictableIdleTimeMillis;  
      
    @Value("${spring.datasource.validationQuery}")  
    private String validationQuery;  
      
    @Value("${spring.datasource.testWhileIdle}")  
    private boolean testWhileIdle;  
      
    @Value("${spring.datasource.testOnBorrow}")  
    private boolean testOnBorrow;  
      
    @Value("${spring.datasource.testOnReturn}")  
    private boolean testOnReturn;  
      
    @Value("${spring.datasource.poolPreparedStatements}")  
    private boolean poolPreparedStatements;  
      
    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")  
    private int maxPoolPreparedStatementPerConnectionSize;  
      
    @Value("${spring.datasource.filters}")  
    private String filters;  
      
    @Value("{spring.datasource.connectionProperties}")  
    private String connectionProperties;  
      
    @Bean     //声明其为Bean实例  
    public DataSource dataSource(){
       LOG.info("Initialize the data source...");
        DruidDataSource datasource = new DruidDataSource();  
          
        datasource.setUrl(this.dbUrl);  
        datasource.setUsername(username);  
        datasource.setPassword(password);  
        datasource.setDriverClassName(driverClassName);  
          
        //configuration  
        datasource.setInitialSize(initialSize);  
        datasource.setMinIdle(minIdle);  
        datasource.setMaxActive(maxActive);  
        datasource.setMaxWait(maxWait);  
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);  
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);  
        datasource.setValidationQuery(validationQuery);  
        datasource.setTestWhileIdle(testWhileIdle);  
        datasource.setTestOnBorrow(testOnBorrow);  
        datasource.setTestOnReturn(testOnReturn);  
        datasource.setPoolPreparedStatements(poolPreparedStatements);  
        datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);  
        try {  
            datasource.setFilters(filters);  
        } catch (SQLException e) {  
           LOG.error("druid configuration initialization filter", e);  
        }  
        datasource.setConnectionProperties(connectionProperties);  
        return datasource;  
    }
    
    /*
    //JdbcTemplate的配置
    @Bean
    public JdbcTemplate jdbcTemplate(){
       JdbcTemplate jdbcTemplate = new JdbcTemplate();
       jdbcTemplate.setDataSource(dataSource());
       return jdbcTemplate;
    }
    
    @Bean
    public NamedParameterJdbcTemplate namedParameterJdbcTemplate(){
       NamedParameterJdbcTemplate namedParameterJdbcTemplate = new NamedParameterJdbcTemplate(dataSource());
       return namedParameterJdbcTemplate;
    }*/
    
    //全局配置
    public GlobalConfiguration globalConfigurationBean(){
        GlobalConfiguration globalConfiguration = new GlobalConfiguration();
        globalConfiguration.setIdType(2);//AUTO->`0`("数据库ID自增")、INPUT->`1`(用户输入ID")、ID_WORKER->`2`("全局唯一ID")、UUID->`3`("全局唯一ID")
        globalConfiguration.setDbColumnUnderline(true);//全局表为下划线命名设置 true
        return globalConfiguration;
    }
    
    //mybatis的配置
    @Bean
    public MybatisSqlSessionFactoryBean sqlSessionFactoryBean() throws IOException{
       ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();  
        //SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        MybatisSqlSessionFactoryBean sqlSessionFactoryBean = new MybatisSqlSessionFactoryBean();//mybatis-plus插件类
        sqlSessionFactoryBean.setDataSource(dataSource());//数据源
        sqlSessionFactoryBean.setGlobalConfig(globalConfigurationBean());//MP全局注入
        sqlSessionFactoryBean.setMapperLocations(resourcePatternResolver.getResources("classpath*:mybatis/mappers/*.xml"));
        sqlSessionFactoryBean.setTypeAliasesPackage("com.study.ssm.entity");//别名，让*Mpper.xml实体类映射可以不加上具体包名
        return sqlSessionFactoryBean;
    }
    
    @Bean(name = "transactionManager")
    public DataSourceTransactionManager dataSourceTransactionManager(){
       DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();
       dataSourceTransactionManager.setDataSource(dataSource());
       return dataSourceTransactionManager;
    }
    
    @Bean(name="transactionInterceptor")
    public TransactionInterceptor interceptor(){
       TransactionInterceptor interceptor = new TransactionInterceptor();
       interceptor.setTransactionManager(dataSourceTransactionManager());
       
       Properties transactionAttributes = new Properties();
       transactionAttributes.setProperty("save*", "PROPAGATION_REQUIRED");
       transactionAttributes.setProperty("del*", "PROPAGATION_REQUIRED");
       transactionAttributes.setProperty("update*", "PROPAGATION_REQUIRED");
       transactionAttributes.setProperty("get*", "PROPAGATION_REQUIRED,readOnly");
       transactionAttributes.setProperty("find*", "PROPAGATION_REQUIRED,readOnly");
       transactionAttributes.setProperty("*", "PROPAGATION_REQUIRED");
       
       interceptor.setTransactionAttributes(transactionAttributes);
       return interceptor;
    }
    
    /*
    //放这里会导致@value注解获取不到配置的值，移到RootConfig
    @Bean
    public BeanNameAutoProxyCreator proxycreate(){
       BeanNameAutoProxyCreator proxycreate = new BeanNameAutoProxyCreator();
       proxycreate.setProxyTargetClass(true);
       proxycreate.setBeanNames("*ServiceImpl");
       proxycreate.setInterceptorNames("transactionInterceptor");
       return proxycreate;
    }*/
    
}

三、再次启动项目，如果正常启动则项目配置dataSource配置正确

第三阶段：测试mybatis继承情况：

　　一、新建UserDTO 实体类 

　　注：我这里使用lombok 插件，如果没有的话可以下一个或者，自己手动增加get、set方法

package com.study.ssm.entity;

import lombok.Getter;
import lombok.Setter;

/**
 * 用户实体类
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
@Getter
@Setter
public class UserDTO {
    private Integer id;
    private String name;
    private String password;

    @Override
    public String toString() {
        return super.toString();
    }
}

二、添加mapper文件：这里注意路径，在DruidDataSourceConfig  会加载进去

<?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.study.ssm.repository.UserRepository">
    <resultMap type="com.study.ssm.entity.UserDTO" id="UserResult">
        <result column="id" property="id" />
        <result column="name" property="name" />
        <result column="password" property="password" />
    </resultMap>
    
    <select id="findById" parameterType="Integer" resultMap="UserResult">
        select * from user where id =#{id}
    </select>

    <update id="updateUser" parameterType="com.study.ssm.entity.UserDTO">
        UPDATE user SET name=#{name} WHERE id=#{id}
    </update>
    
</mapper>

三、UserRepository 

package com.study.ssm.repository;

import com.study.ssm.entity.UserDTO;
import org.apache.ibatis.annotations.Param;

/**
 * UserRepository
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
public interface UserRepository {
    UserDTO findById(@Param("id") Integer id);

    void updateUser(UserDTO userDTO);
}

四、UserService和UserServiceImpl

package com.study.ssm.service;

import com.study.ssm.entity.UserDTO;

/**
 * UserService
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
public interface UserService {
    
    UserDTO findById(Integer id);
    
    void updateUserById(UserDTO userDTO);
}

package com.study.ssm.service.spring;

import com.study.ssm.entity.UserDTO;
import com.study.ssm.repository.UserRepository;
import com.study.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * UserServiceImpl
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserRepository userRepository;

    @Override
    public UserDTO findById(Integer id) {
        UserDTO userDTO = userRepository.findById(id);
        return userDTO;
    }

    @Override
    public void updateUserById(UserDTO userDTO) {
        userRepository.updateUser(userDTO);
    }
}

五、写一个UserController 测试一下

package com.study.ssm.controller;

import com.study.ssm.entity.UserDTO;
import com.study.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * UserController
 *
 * @author EnzoLuo
 * @date 2018/10/22
 */
@RestController
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/getUserById")
    public UserDTO getUserById(@RequestParam(name = "id") Integer id) {
        UserDTO userDTO = userService.findById(id);
        return userDTO;
    }
    @PostMapping("/updateUserById")
    public String updateUser(){
        try{
            UserDTO userDTO = new UserDTO();
            userDTO.setId(1);
            userDTO.setName("enzoluo");
            userDTO.setPassword("456");
            userService.updateUserById(userDTO);
        }catch(Exception e){
            e.printStackTrace();
            return "update failed";
        }
        return "update success";
    }
}

结果：查询

修改：

再次查询：

 

打完收工，谢谢阅读！

githup出了点问题，稍后会将代码放上去。