说明:
随着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:Spring Tool Suite 3.9.4.RELEASE
- springboot: 2.0.1.RELEASE
- jdk:1.8.0_40
- maven:3.5.1
- alibaba Druid 数据库连接池:1.1.0
额外功能:
- PageHelper 分页插件
开始搭建环境:
- 首先创建springBoot项目,我这里就不一一讲解了,不明白的童鞋可以自行百度,网上有详细说明
- 接下来就是重点了首先引入相关jar包
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.example</groupId>
<artifactId>demo-1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo-1</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<java.version>1.8</java.version>
<!-- excel export -->
<poi.version>3.17</poi.version>
<!-- impala -->
<hive.version>2.5.42</hive.version>
<thrift.version>0.9.3</thrift.version>
<!-- mybatis -->
<mybatis.version>3.4.6</mybatis.version>
<mybatis.spring.version>1.3.2</mybatis.spring.version>
<!-- charset encding -->
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
<dependencies>
<!-- start: spring boot -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!-- end: spring boot -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.29</version>
</dependency>
<!-- springboot分页插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.3</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:
- 基于XML形式
- 基于注解形式
项目启动类:
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Demo2Application {
public static void main(String[] args) {
SpringApplication.run(Demo2Application.class, args);
}
}
配置:
application.properties
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,在resource文件夹下创建一个application.yml
文件
#application port configuration
server.port=8080
#dataSource configuration
spring.datasource.name=springboots
spring.datasource.url=jdbc\:mysql\://127.0.0.1\:3306/mytest?useUnicode\=true&characterEncoding\=gbk&zeroDateTimeBehavior\=convertToNull
spring.datasource.username=root
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.filters=stat
spring.datasource.maxActive=20
spring.datasource.initialSize=1
spring.datasource.maxWait=60000
spring.datasource.minIdle=1
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.maxOpenPreparedStatements=20
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.example.demo.entity;
public class UserDomain {
private Integer userId;
private String userName;
private String password;
private String phone;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName == null ? null : userName.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone == null ? null : phone.trim();
}
}
创建 :controller
package com.example.demo.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.example.demo.entity.UserDomain;
import com.example.demo.service.UserService;
import com.github.pagehelper.PageHelper;
/**
* Created by Administrator on 2017/8/16.
*/
@Controller
@RequestMapping(value = "/user")
public class UserController {
@Autowired
private UserService userService;
@ResponseBody
@GetMapping("/all")
public Object findAllUser(int pageNum, int pageSize) {
//开始分页
PageHelper.startPage(pageNum,pageSize);
return userService.findAllUser(pageNum,pageSize);
}
}
创建:service
package com.example.demo.service;
import java.util.List;
import com.example.demo.entity.UserDomain;
/**
* Created by Administrator on 2018/4/19.
*/
public interface UserService {
List<UserDomain> findAllUser(int pageNum, int pageSize);
}
创建:serviceImpl
package com.example.demo.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.example.demo.entity.UserDomain;
import com.example.demo.mapper.UserMapper;
import com.example.demo.service.UserService;
import com.github.pagehelper.PageHelper;
/**
* Created by Administrator on 2017/8/16.
*/
@Service(value = "userService")
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;//这里会报错,但是并不会影响
/*
* 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 List<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);
return userMapper.selectUsers();
}
}
创建:Mapper
- 以注解的形式
package com.example.demo.mapper;
import java.util.List;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import com.example.demo.entity.UserDomain;
@Mapper
public interface UserMapper {
@Select(" SELECT\n" +
" user_id userId,\n" +
" user_name userName,\n" +
" password password,\n" +
" phone\n" +
" FROM\n" +
" t_user")
List<UserDomain> selectUsers();
}
- 以XML的形式(在这里一定要加上注解)
package com.example.demo.mapper;
import java.util.List;
import org.apache.ibatis.annotations.Mapper;
import com.example.demo.entity.UserDomain;
@Mapper
public interface UserMapper {
int insert(UserDomain record);
List<UserDomain> selectUsers();
}
- 如果是以XML的形式还要进行一下步骤
- resource目录下新建mapper文件夹(文件夹名字可以自定义)
- 在配置文件中添加一下代码:(这里主要用于指定mybatis 映射文件路径.classpath后面的文件夹名称一定要和上面自己建的文件夹名称一致)
mybatis.mapper-locations=classpath:mapper/*.xml
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.example.demo.mapper.UserMapper" >
<select id="selectUsers" resultType="com.example.demo.entity.UserDomain">
SELECT
user_id userId,
user_name userName,
password password,
phone
FROM
t_user
</select>
</mapper>
到这里所有的配置已经完成.在浏览器中访问:http://localhost:8080/user/all?pageNum=3&pageSize=4
其中参数是为了分页所用分别表示:pageNum:当前页数------pageSize:每页显示数量
测试:
代码资源地址:
- SpringBoot 2.0.2基于XML配置形式Mybatis:https://download.csdn.net/download/guokezhongdeyuzhou/10407485
- SpringBoot 2.0.2基于注解形式Mybatis:https://download.csdn.net/download/guokezhongdeyuzhou/10407462