使用idea实现springboot Mybatis 整合(springboot 2.x)
- 学习笔录-spring boot
- 时间:2018-07-15 17:26
- 4460人已阅读
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写在前面
本来这篇博文老在就写好了,但是后来发现很多功能其实根本就没有检验通过就发出来了,导致遗留了很多坑,比如最难搞的就是SqlSessionFactory和PageHelper,之前写过关于springboot1.5.6版本的整合,这段时间刚好springboot发布了2.0的正式版本,很多同学可能没有注意版本,导致了整合的时候出现了很多很多的问题,这几天刚好有空就试着整合一下springboot2.0 mybatis,发现了很多很多的坑,而且网上的资源也不多,终于在两天的踩坑中成功整合了,并且将翻页功能修复好了,废话不多说了,看代码:
环境/版本一览:
开发工具:Intellij IDEA 2017.1.3
springboot: 2.0.1.RELEASE
jdk:1.8.0_40
maven:3.3.9
alibaba Druid 数据库连接池:1.1.9
额外功能:
PageHelper 分页插件
mybatis generator 自动生成代码插件(本次搭建就不讲解了,请参照Spring boot Mybatis 整合(完整版))
开始搭建:
创建项目:
添加基础的依赖:
依赖文件:
按照pom文件补齐需要的依赖:
<?xml version="1.0" encoding="UTF-8"?><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.winterchen</groupId> <artifactId>springboot2-mybatis-demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot2-mybatis-demo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.4</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-joda</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.module</groupId> <artifactId>jackson-module-parameter-names</artifactId> </dependency> <!-- 分页插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.5</version> </dependency> <!-- alibaba的druid数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.9</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>
项目结构:
项目启动类:
package com.kaigejava; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication @MapperScan("com.winterchen.dao") public class Springboot2MybatisDemoApplication { public static void main(String[] args) { SpringApplication.run(Springboot2MybatisDemoApplication.class, args); } }
配置:
可以根据个人使用习惯选择使用
properties
或者yml
文件,本项目使用的是yml配置文件,所以把原本application.properties
删除,创建一个application.yml
文件
在resource文件夹下创建application.yml
server: port: 8080 spring: datasource: name: mysql_test type: com.alibaba.druid.pool.DruidDataSource #druid相关配置 druid: #监控统计拦截的filters filters: stat driver-class-name: com.mysql.jdbc.Driver #基本属性 url: jdbc:mysql://127.0.0.1:3306/mytest?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true username: root password: root #配置初始化大小/最小/最大 initial-size: 1 min-idle: 1 max-active: 20 #获取连接等待超时时间 max-wait: 60000 #间隔多久进行一次检测,检测需要关闭的空闲连接 time-between-eviction-runs-millis: 60000 #一个连接在池中最小生存的时间 min-evictable-idle-time-millis: 300000 validation-query: SELECT 'x' test-while-idle: true test-on-borrow: false test-on-return: false #打开PSCache,并指定每个连接上PSCache的大小。oracle设为true,mysql设为false。分库分表较多推荐设置为false pool-prepared-statements: false max-pool-prepared-statement-per-connection-size: 20 mybatis: mapper-locations: classpath:mapper/*.xml type-aliases-package: com.winterchen.model #pagehelper pagehelper: helperDialect: mysql reasonable: true supportMethodsArguments: true params: count=countSql returnPageInfo: check
创建包:
model
,dao
,mapper
创建数据库和数据表
CREATE DATABASE mytest;CREATE TABLE t_user( userId INT NOT NULL PRIMARY KEY AUTO_INCREMENT, userName VARCHAR(255) NOT NULL , password VARCHAR(255) NOT NULL , phone VARCHAR(255) NOT NULL) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;
创建实体类:UserDomain.java
package com.kaigejava.model; public class UserDomain { private Integer userId; private String userName; private String password; private String phone; // get,set方法略... }
创建dao:
UserDao.java
package com.kaigejava.dao; import com.winterchen.model.UserDomain; import org.apache.ibatis.annotations.Mapper; import java.util.List; public interface UserDao { int insert(UserDomain record); List<UserDomain> selectUsers(); }
创建mybatis映射文件: UserMapper.xml
<?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.kaigejava.dao.UserDao" > <sql id="BASE_TABLE"> t_user </sql> <sql id="BASE_COLUMN"> userId,userName,password,phone </sql> <insert id="insert" parameterType="com.winterchen.model.UserDomain"> INSERT INTO <include refid="BASE_TABLE"/> <trim prefix="(" suffix=")" suffixOverrides=","> userName,password, <if test="phone != null"> phone, </if> </trim> <trim prefix="VALUES(" suffix=")" suffixOverrides=","> #{userName, jdbcType=VARCHAR},#{password, jdbcType=VARCHAR}, <if test="phone != null"> #{phone, jdbcType=VARCHAR}, </if> </trim> </insert> <select id="selectUsers" resultType="com.winterchen.model.UserDomain"> SELECT <include refid="BASE_COLUMN"/> FROM <include refid="BASE_TABLE"/> </select> </mapper>
创建剩余的controller
,service
包和文件
UserService.java
package com.kaigejava.service.user; import com.github.pagehelper.PageInfo; import com.winterchen.model.UserDomain; import java.util.List; /** * Created by kaigejava on 2018/4/19. */ public interface UserService { int addUser(UserDomain user); PageInfo<UserDomain> findAllUser(int pageNum, int pageSize); }
UserServiceImpl
package com.kaigejava.service.user.impl; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import com.winterchen.dao.UserDao; import com.winterchen.model.UserDomain; import com.winterchen.service.user.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; /** * Created by kaigejava on 2017/8/16. */ @Service(value = "userService") public class UserServiceImpl implements UserService { @Autowired private UserDao userDao;//这里会报错,但是并不会影响 @Override public int addUser(UserDomain user) { return userDao.insert(user); } /* * 这个方法中用到了我们开头配置依赖的分页插件pagehelper * 很简单,只需要在service层传入参数,然后将参数传递给一个插件的一个静态方法即可; * pageNum 开始页数 * pageSize 每页显示的数据条数 * */ @Override public PageInfo<UserDomain> findAllUser(int pageNum, int pageSize) { //将参数传给这个方法就可以实现物理分页了,非常简单。 PageHelper.startPage(pageNum, pageSize); List<UserDomain> userDomains = userDao.selectUsers(); PageInfo result = new PageInfo(userDomains); return result; } }
UserController.java
package com.kaigejava.controller; import com.github.pagehelper.PageHelper; import com.winterchen.model.UserDomain; import com.winterchen.service.user.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.*; /** * Created by kaigejava on 2017/8/16. */ @Controller @RequestMapping(value = "/user") public class UserController { @Autowired private UserService userService; @ResponseBody @PostMapping("/add") public int addUser(UserDomain user){ return userService.addUser(user); } @ResponseBody @GetMapping("/all") public Object findAllUser( @RequestParam(name = "pageNum", required = false, defaultValue = "1") int pageNum, @RequestParam(name = "pageSize", required = false, defaultValue = "10") int pageSize){ return userService.findAllUser(pageNum,pageSize); } }
项目最终的结构
到这里如果项目就成功搭建完成了,如果还是报错的话,请仔细看看配置,后面会给出源码地址,程序员就是要不断和bug进行斗争,加油。
测试
启动项目
这样就表示启动成功了
然后,开始测试吧,博主使用的是postMan,一个进行http请求的测试工具
添加数据
查询数据
来源:https://blog.csdn.net/Winter_chen001/article/details/80010967