本文共 7954 字，大约阅读时间需要 26 分钟。

在pom.xml里添加jar包：

<dependency>

<groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <!-- druid阿里巴巴数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.26</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <!-- MySql数据库驱动 --> <dependency> <groupId> mysql</groupId> <artifactId> mysql-connector-java</artifactId> <version> 5.0.5</version> </dependency>

1、在application.properties里添加

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource 2、在resources里创建mybatis.properties spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://127.0.0.1:3306/db spring.datasource.username=root spring.datasource.password=123456 # 初始化大小，最小，最大 spring.datasource.initialSize=5 spring.datasource.minIdle=5 spring.datasource.maxActive=20 # 配置获取连接等待超时的时间 spring.datasource.maxWait=60000 # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 spring.datasource.timeBetweenEvictionRunsMillis=60000 # 配置一个连接在池中最小生存的时间，单位是毫秒 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,logback # 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

3、在com.demo下创建文件夹mybatis，创建文件MybatisConfig

package com.query.mybatis;import lombok.extern.slf4j.Slf4j;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.annotation.MapperScan;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.jdbc.datasource.DataSourceTransactionManager;import org.springframework.transaction.annotation.EnableTransactionManagement;import javax.sql.DataSource;/** * Created by huguoju on 2017/1/4. */@Configuration@Slf4j@EnableTransactionManagement@ComponentScan@MapperScan("com.demo.mapper")public class MybatisConfig {    @Value("${spring.datasource.type}")    private Class
    dataSourceType;    @Bean(name="dataSource", destroyMethod = "close", initMethod="init")    @ConfigurationProperties(prefix = "spring.datasource")    public DataSource dataSource() {        log.info("-------------------- writeDataSource init ---------------------");        return DataSourceBuilder.create().type(dataSourceType).build();    }    @Bean    public SqlSessionFactory sqlSessionFactory() throws Exception {        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();        sqlSessionFactoryBean.setDataSource(dataSource());        sqlSessionFactoryBean.setTypeAliasesPackage("com.demo.model");        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();        sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:com/demo/mapper/*.xml"));        sqlSessionFactoryBean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);        return sqlSessionFactoryBean.getObject();    }    /**     * 配置事务管理器     */    @Bean(name = "transactionManager")    @Primary    public DataSourceTransactionManager transactionManager(@Qualifier("dataSource") DataSource dataSource) throws Exception {        return new DataSourceTransactionManager(dataSource);    }}

以上就完成了配置，测试，在com/demo下创建mapper文件夹，创建UserMapper

package com.demo.mapper;import com.demo.model.User;import org.apache.ibatis.annotations.ResultType;import org.apache.ibatis.annotations.Select;import org.springframework.stereotype.Repository;/** * Created by huguoju on 2016/12/28. */@Repository("userMapper")public interface UserMapper {    @Select("SELECT * from `user`  where user_code = #{userCode}")    @ResultType(User.class)    User selectByPrimaryKey(Integer userCode);}

如果使用mapper.xml，要在pom.xml里添加

   		
    			
     				
      
       src/main/java
      				
      					
       
        **/*.xml
       				
      			
     		
    	
   

否则mapper编译不到target里。

在com/demo下创建model文件夹，创建User

package com.demo.model;import lombok.Data;/** * Created by huguoju on 2016/12/28. */@Datapublic class User {    private Integer userCode;    private String mobileNumber;}

在com/demo下创建service文件夹，创建service文件，接口类忽略了，只复制实现类

package com.demo.service.impl;import com.demo.mapper.UserMapper;import com.demo.model.User;import com.demo.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;/** * Created by huguoju on 2016/12/28. */@Service("userService")public class UserServiceImpl implements UserService {    @Autowired    private UserMapper userMapper;    @Override    public User selectByPrimaryKey(Integer userCode) {        return userMapper.selectByPrimaryKey(userCode);    }}

可以查询到数据。

4、用druid监控数据库，在com/demo下创建文件夹druid，创建文件DruidDataSourceConfig

package com.demo.druid;import org.springframework.boot.bind.RelaxedPropertyResolver;import org.springframework.context.EnvironmentAware;import org.springframework.context.annotation.Configuration;import org.springframework.core.env.Environment;import org.springframework.transaction.annotation.EnableTransactionManagement;/** * Created by huguoju on 2016/12/28. * Druid的DataResource配置类 */@Configuration@EnableTransactionManagementpublic class DruidDataSourceConfig  implements EnvironmentAware {    private RelaxedPropertyResolver propertyResolver;    public void setEnvironment(Environment env) {        this.propertyResolver = new RelaxedPropertyResolver(env, "spring.datasource.");    }}

创建DruidStatFilter

package com.demo.druid;import com.alibaba.druid.support.http.WebStatFilter;import javax.servlet.annotation.WebFilter;import javax.servlet.annotation.WebInitParam;/** * Created by huguoju on 2016/12/28. * Druid拦截器，用于查看Druid监控 */@WebFilter(filterName="druidWebStatFilter",urlPatterns="/*",        initParams={                @WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")// 忽略资源        })public class DruidStatFilter extends WebStatFilter {}

创建DruidStatViewServlet

package com.demo.druid;import com.alibaba.druid.support.http.StatViewServlet;import javax.servlet.annotation.WebInitParam;import javax.servlet.annotation.WebServlet;/** * Created by huguoju on 2016/12/28. * Druid的Servlet */@SuppressWarnings("serial")@WebServlet(urlPatterns = "/druid/*",        initParams={                @WebInitParam(name="allow",value="127.0.0.1,192.168.1.126"),// IP白名单 (没有配置或者为空，则允许所有访问)                @WebInitParam(name="deny",value="192.168.1.111"),// IP黑名单 (存在共同时，deny优先于allow)                @WebInitParam(name="loginUsername",value="root"),// 用户名                @WebInitParam(name="loginPassword",value="123456"),// 密码                @WebInitParam(name="resetEnable",value="false")// 禁用HTML页面上的“Reset All”功能        })public class DruidStatViewServlet extends StatViewServlet {}

在DemoApplication上面添加@ServletComponentScan

创建好之后，我们访问 http://localhost/druid/index.html,会自动跳到http://localhost/druid/login.html登录页面

账户和密码为上面的

转载地址：http://mmpws.baihongyu.com/