spring-boot與druid、mybatis集成（包括pageHelper分頁插件）, 要添加以下幾個依賴項:

compile('mysql:mysql-connector-java:6.0.5')compile('tk.mybatis:mapper-spring-boot-starter:1.1.1')compile('org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.0')compile('com.github.pagehelper:pagehelper-spring-boot-starter:1.1.1')compile('com.alibaba:druid:1.0.28')

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一、集成druid

1.1 編寫自定義屬性類

package com.cnblogs.yjmyzz.druid;import lombok.Data; import org.springframework.boot.context.properties.ConfigurationProperties;@ConfigurationProperties(prefix = "druid") @Data public class DruidProperties {private String url;private String username;private String password;private String driverClass;private int maxActive;private int minIdle;private int initialSize;private boolean testOnBorrow; }

注：這里只列出了主要屬性，其它屬性如果需要，可自行添加

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1.2 創建自定義配置類

package com.cnblogs.yjmyzz.druid;import com.alibaba.druid.pool.DruidDataSource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.autoconfigure.AutoConfigureBefore; import org.springframework.boot.autoconfigure.condition.ConditionalOnClass; import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty; import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;import javax.sql.DataSource; import java.sql.SQLException;@Configuration @EnableConfigurationProperties(DruidProperties.class) @ConditionalOnClass(DruidDataSource.class) @ConditionalOnProperty(prefix = "druid", name = "url") @AutoConfigureBefore(DataSourceAutoConfiguration.class) public class DruidAutoConfiguration {@Autowiredprivate DruidProperties properties;@Beanpublic DataSource dataSource() {DruidDataSource dataSource = new DruidDataSource();dataSource.setUrl(properties.getUrl());dataSource.setUsername(properties.getUsername());dataSource.setPassword(properties.getPassword());if (properties.getInitialSize() > 0) {dataSource.setInitialSize(properties.getInitialSize());}if (properties.getMinIdle() > 0) {dataSource.setMinIdle(properties.getMinIdle());}if (properties.getMaxActive() > 0) {dataSource.setMaxActive(properties.getMaxActive());}dataSource.setTestOnBorrow(properties.isTestOnBorrow());try {dataSource.init();} catch (SQLException e) {throw new RuntimeException(e);}return dataSource;} }　　

注1：如果多數據源的，參考上面的代碼自行修改

注2：上面這二個類，可以抽出來放到公用類庫里，方便以后復用。　

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1.3 添加 META-INF/spring.factories

參考如下內容（告訴spring-boot，如何自動加載配置)

# Auto Configure org.springframework.boot.autoconfigure.EnableAutoConfiguration=\ com.cnblogs.yjmyzz.druid.DruidAutoConfiguration

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1.4 application.yml中配置

druid:url: jdbc:mysql://localhost:3306/study?useSSL=falsedriver-class: com.mysql.jdbc.Driverusername: rootpassword: ***initial-size: 1min-idle: 1max-active: 20test-on-borrow: true

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二、集成mybatis

2.1 常規的mapper/xml配置

這個跟常規使用mybatis并沒有什么不同，參考上圖的結構

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2.2 抽象一個通用Mapper

package com.cnblogs.yjmyzz.util;import tk.mybatis.mapper.common.Mapper; import tk.mybatis.mapper.common.MySqlMapper;public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> {}

寫這個通用Mapper是為了后面寫crud代碼更簡單，其它具體的XXXMapper都應該繼承它，類似：

package com.cnblogs.yjmyzz.dao.mapper;import com.cnblogs.yjmyzz.dao.model.City; import com.cnblogs.yjmyzz.util.MyMapper;public interface CityMapper extends MyMapper<City> { }

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2.3 application.yml配置

mybatis:type-aliases-package: com.cnblogs.yjmyzz.service.daomapper-locations: classpath:mapper/*.xmlmapper:mappers:- com.cnblogs.yjmyzz.util.MyMappernot-empty: falseidentity: MYSQLpagehelper:helperDialect: mysqlreasonable: truesupportMethodsArguments: trueparams: count=countSql

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還有一個常見問題：如何在調試時輸出SQL語句，以及屏蔽掉一些不需要的日志？可參考下面的配置

logging:level:root: DEBUGtk.mybatis: DEBUGcom.alibaba.dubbo: ERRORorg.apache.zookeeper: ERRORfile: "/var/log/application/dubbo-provider.log"

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最后使用的地方，代碼就跟常規代碼完全一樣了，參考下面：

package com.cnblogs.yjmyzz.service.impl;import com.alibaba.dubbo.config.annotation.Service; import com.cnblogs.yjmyzz.dao.mapper.CityMapper; import com.cnblogs.yjmyzz.dao.model.City; import com.cnblogs.yjmyzz.service.api.DemoService; import com.cnblogs.yjmyzz.service.api.vo.CityVO; import com.github.pagehelper.PageHelper; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.util.CollectionUtils;import java.util.ArrayList; import java.util.List;/*** Created by 菩提樹下的楊過(http:/yjmyzz.cnblogs.com) on 2017/5/21.*/ @Service(version = "1.0.0") public class DemoServiceImpl implements DemoService {Logger logger = LoggerFactory.getLogger(DemoServiceImpl.class);@AutowiredCityMapper cityMapper;@Overridepublic List<CityVO> getCityList(int pageIndex, int pageSize) {PageHelper.startPage(pageIndex, pageSize);//設置分頁參數List<City> list = cityMapper.selectAll();com.github.pagehelper.PageInfo page = new com.github.pagehelper.PageInfo<>(list);//取頁面信息List<CityVO> result = new ArrayList<>();if (!CollectionUtils.isEmpty(list)) {for (City c : list) {CityVO v = new CityVO();v.setCityName(c.getName());v.setProvinceName(c.getState());result.add(v);}}logger.info("pageInfo=> page:" + page.getPageNum() + "/" + page.getPages());return result;}}

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文中的示例代碼，已經托管在github上，地址：https://github.com/yjmyzz/spring-boot-dubbo-demo

轉載于:https://www.cnblogs.com/yjmyzz/p/spring-boot-integrate-with-mybatis-and-druid-tutorial.html

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