资料参考：MyBatis-Spring-Boot

1、集成Mybatis、通用Mapper和分页插件PageHelper

DevTools 热启动配置会造成mybatis报错，解决方案见MyBatis-Spring-Boot。示例取消了DevTools

• pom.xml:jar引入

<!--mybatis--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.1.1</version></dependency><!--mybatis之mapper插件--><dependency><groupId>tk.mybatis</groupId><artifactId>mapper-spring-boot-starter</artifactId><version>1.1.1</version></dependency><!--mybatis之pagehelper插件--><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.1.1</version></dependency>

• application.properties:框架、插件配置

#mybatis
#数据库实体对象位置
mybatis.type-aliases-package=com.ss.quickStart.domain
#mybatis中xml配置文件
mybatis.mapper-locations=classpath:mapper/*.xml#mapper：https://github.com/abel533/Mapper
#mappers:指定基础Mapper继承接口，多个时逗号隔开
mapper.mappers=com.ss.quickStart.core.Mapper
#insert、update是否判断字符串类型!='' 即 test="str != null"表达式内是否追加 and str != ''
mapper.not-empty=false
#主键生成策略：http://git.oschina.net/free/Mapper/blob/master/wiki/mapper3/3.Use.md 第3点
mapper.identity=MYSQL#pagehelper：https://github.com/pagehelper/Mybatis-PageHelper
#指定数据库分页类型
pagehelper.helperDialect=mysql
#页码<=0 查询第一页，页码>=总页数查询最后一页
pagehelper.reasonable=true
#支持通过 Mapper 接口参数来传递分页参数：https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql

• User.java:表实体对象，主键id设置为自增

/*** Created by wsy on 2017/8/8.* 实体类注解：http://git.oschina.net/free/Mapper/blob/master/wiki/mapper3/3.Use.md：第2点*/
@Table(name = "user")
public class User {@Id//@GeneratedValue(strategy = GenerationType.IDENTITY)//主键策略：http://git.oschina.net/free/Mapper/blob/master/wiki/mapper3/3.Use.md：第3点@GeneratedValue(generator = "JDBC")private Long id;@Column(name = "name")private String name;private Integer sex;}

• Mapper.java:自定义的通用Mapper

/*** 自定义Mapper* 关于Mapper详解：http://git.oschina.net/free/Mapper/blob/master/wiki/mapper3/5.Mappers.md* @param <T>*/
public interface Mapper<T> extendsBaseMapper<T>,ConditionMapper<T>,IdsMapper<T>,InsertListMapper<T> {
}

• UserMapper:User对象Dao层

public interface UserMapper extends Mapper<User> {}

• UserService:Service层代码

@Service
public class UserService {private static final Logger  LOG = LoggerFactory.getLogger(UserService.class);@Resourceprivate UserMapper userMapper;public User getById(long id){return userMapper.selectByPrimaryKey(id);}public Boolean add(User user){int count = userMapper.insert(user);LOG.info("新增用户id=>{}",user.getId());return count==1?true:false;}public Boolean batchAdd(List<User> userList){int count = userMapper.insertList(userList);return true;}public List<User> findAll(){//return userMapper.selectAll();Condition condition = new Condition(User.class);condition.setOrderByClause("id DESC");return userMapper.selectByCondition(condition);}
}

• UserController.java:controller层代码

@RestController
public class UserController {@Autowiredprivate PropertiesValues propertiesValues;@Resourceprivate UserService userService;//取配置文件中author.name值，若没有则赋值为ss@Value("${author.name:ss}")private String name;@RequestMapping("getUser.do")public User getUser(){User user = new User();user.setName(propertiesValues.getUserName());user.setSex(1);System.out.println(MessageFormat.format("name=>{0}",name));return user;}@RequestMapping("user/getById.do")public User getById(Long id){return userService.getById(id);}@RequestMapping("user/add.do")public Boolean add(User user){return userService.add(user);}/*** 通过JSON方式解析入参：请求头中content-type:application/json;Request Body:{"name": "AA","sex": 1}* localhost:8080/user/addByJSON.do?{"name": "AA","sex": 1}* @param user* @return*/@RequestMapping("user/addByJSON.do")public Boolean addByJSON(@RequestBody User user){return userService.add(user);}/*** 批量添加用户:* localhost:8080/user/batchAdd.do?userList[0].name=A&userList[0].sex=1&userList[1].name=B&userList[1].sex=0* @param userListDTO* @return*/@RequestMapping("user/batchAdd.do")public Boolean batchAdd(UserListDTO userListDTO){return userService.batchAdd(userListDTO.getUserList());}@RequestMapping("/list")public PageInfo list(@RequestParam(defaultValue = "0") Integer page, @RequestParam(defaultValue = "0") Integer size) {PageHelper.startPage(page, size);List<User> list = userService.findAll();PageInfo pageInfo = new PageInfo(list);return pageInfo;}
}

• QuickStartApplication.java:启动类，增加@MapperScan,扫描对应Dao接口

@ServletComponentScan
@SpringBootApplication
@MapperScan(basePackages = "com.ss.quickStart.dao")
public class QuickStartApplication {public static void main(String[] args) {SpringApplication.run(QuickStartApplication.class, args);}
}

• user.sql:user表创建sql

CREATE TABLE `user` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键',`name` varchar(30) DEFAULT NULL,`sex` int(20) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8;

2、实例运行：分页查询

http://localhost:8080/list?page=5&size=5

{"pageNum": 5,"pageSize": 5,"size": 2,"startRow": 21,"endRow": 22,"total": 22,"pages": 5,"list": [{"id": 2,"name": "s","sex": 1},{"id": 1,"name": "w","sex": 1}],"prePage": 4,"nextPage": 0,"isFirstPage": false,"isLastPage": true,"hasPreviousPage": true,"hasNextPage": false,"navigatePages": 8,"navigatepageNums": [1,2,3,4,5],"navigateFirstPage": 1,"navigateLastPage": 5,"firstPage": 1,"lastPage": 5
}

3、资料 参考

https://segmentfault.com/a/1190000008347611

https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md