SpringBoot整合mybatis+generator自动生成代码+druid连接池+PageHelper分页插件
springboot终于迎来了2.0版本，很多新的特性让springboot更加强大，之前使用1.5.6版本整合了Mybatis，现在2.0版本就已经不适用了，所以，在摸索中搭建了2.0版本整合Mybatis
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
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：
<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>4.0.0modelVersion>
<groupId>com.saogroupId>
<artifactId>demoartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>demoname>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>2.0.1.RELEASEversion>
<relativePath/>
parent>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<java.version>1.8java.version>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-jdbcartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
<version>1.3.2version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<scope>runtimescope>
dependency>
<dependency>
<groupId>org.apache.commonsgroupId>
<artifactId>commons-lang3artifactId>
<version>3.4version>
dependency>
<dependency>
<groupId>com.github.pagehelpergroupId>
<artifactId>pagehelper-spring-boot-starterartifactId>
<version>1.2.5version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druid-spring-boot-starterartifactId>
<version>1.1.9version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>fastjsonartifactId>
<version>1.1.29version>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
<plugin>
<groupId>org.mybatis.generatorgroupId>
<artifactId>mybatis-generator-maven-pluginartifactId>
<version>1.3.2version>
<configuration>
<configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xmlconfigurationFile>
<overwrite>trueoverwrite>
<verbose>trueverbose>
configuration>
plugin>
plugins>
build>
project>
项目结构：
项目启动类：
package com.winterchen;
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);
}
}
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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;
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创建实体类：UserDomain.java
package com.winterchen.model;
public class UserDomain {
private Integer userId;
private String userName;
private String password;
private String phone;
// get,set方法略...
}
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创建dao：
UserDao.java
package com.winterchen.dao;
import com.winterchen.model.UserDomain;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
public interface UserDao {
int insert(UserDomain record);
List selectUsers();
}
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创建mybatis映射文件： UserMapper.xml
<mapper namespace="com.winterchen.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>
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创建剩余的controller，service包和文件
UserService.java
package com.winterchen.service.user;
import com.github.pagehelper.PageInfo;
import com.winterchen.model.UserDomain;
import java.util.List;
/**
* Created by Administrator on 2018/4/19.
*/
public interface UserService {
int addUser(UserDomain user);
PageInfo findAllUser(int pageNum, int pageSize);
}
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UserServiceImpl
package com.winterchen.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 Administrator 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 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 userDomains = userDao.selectUsers();
PageInfo result = new PageInfo(userDomains);
return result;
}
}
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UserController.java
package com.winterchen.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 Administrator 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);
}
}
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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
