Spring Boot+Mybatis的搭建

Spring Boot+Mybatis的搭建

原文:https://blog.csdn.net/bandaotixiruiqiang/article/details/54969654

本人已经开发JAVA有一段时间了，所以说的内容会需要一定的JAVA基础知识。

直接上代码吧： 
1.创建MAVEN项目

创建一个格式为war的maven项目 
下面列出所需要的包依赖：

    <properties>
        <java.version>1.8</java.version>
        <druid.version>1.0.27</druid.version>
        <fastjson.version>1.2.17</fastjson.version>
    </properties>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.3.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <!-- 因为我想把war部署在tomcat中所以不需要内嵌tomcat -->
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>
    <build>
        <defaultGoal>compile</defaultGoal>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <encoding>UTF8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <!-- 打包插件 -->
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

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2.创建配置文件

在项目的src/main/resources下创建一个名为application.yml的文件

1).创建spring boot直接读取文件(application.yml) 
文件内容：

spring:
   profiles:
       active: dev
       #dev表示开发环境配置，对应配置文件---application-dev.yml
       #pro表示线上环境配置，对应配置文件---application-pro.yml

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2).创建开发环境配置文件 
文件内容:

logging:

#日志配置部分

   file: /home/logs/bandaotixi/bandaotixi.log
   level:
       root: info
spring:
   datasource:
       url: jdbc:mysql://localhost:3306/bandaotixi
       username: test
       password: test
       type: com.alibaba.druid.pool.DruidDataSource
       driver-class-name: com.mysql.jdbc.Driver
   mvc:
     view:
       prefix: /WEB-INF/jsp/
       suffix: .jsp
mybatis:
  #*Mapper.java可以随便放，只要和mapper.xml对应上就行
   mapper-locations: classpath*:com/bandaotixi/front/core/mapper/*.xml
   type-aliases-package: com.bandaoti.demo.backend.entity

#这个插件是mybatis的分页查询

pagehelper:
   helperDialect: mysql
   reasonable: true
   supportMethodsArguments: true
   params: count=countSql

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3.创建实体映射文件

可以用mybatis-generator.jar工具来生成mybatis对应的实体映射文件 
以下是我修改过的工具包(1积分)

mybatis-generator-core-1.3.6.jar 
此包可以生成自定义主键类型，譬如要生成uuid主键对应mysql数据的配置文件为：

<table tableName="user" domainObjectName="User"><generatedKey column="id" sqlStatement="SELECT replace(uuid(),'-','') FROM dual"/></table>

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下面附上所有配置详情(文件名:generatorConfig.xml)：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<!--
生成mapper命令
java -jar mybatis-generator-core-1.3.6.jar -configfile generatorConfig.xml -overwrite
-->
<generatorConfiguration>
    <classPathEntry location="C:\Users\zengxiaowei\.m2\repository\mysql\mysql-connector-java\5.1.39\mysql-connector-java-5.1.39.jar" />
    <context id="fontinfo">
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <jdbcConnection connectionURL="jdbc:mysql://locahost:3306/bandaotixi?useUnicode=true&amp;characterEncoding=utf-8&amp;useSSL=true" driverClass="com.mysql.jdbc.Driver" password="test" userId="test" />
        <javaModelGenerator targetPackage="com.bandaotixi.front.core.entity" targetProject="bandaotixi-front-core/src/main/java" />
        <sqlMapGenerator targetPackage="com.bandaotixi.front.core.mapper" targetProject="bandaotixi-front-core/src/main/java" />
        <javaClientGenerator targetPackage="com.bandaotixi.front.core.dao" targetProject="bandaotixi-front-core/src/main/java" type="XMLMAPPER" />
        <table tableName="user" domainObjectName="User"><generatedKey column="id" sqlStatement="SELECT replace(uuid(),'-','') FROM dual"/></table>
    </context>
</generatorConfiguration>

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生成对应的目录文件如下图： 

UserMapper.java 
User.java 
UserExample.java 
UserMapper.xml 
3.创建Service 
拿userService举栗子

1).创建UserService.java

package com.bandaotixi.front.core.service;
import com.bandaotixi.front.core.entity.User;
import com.github.pagehelper.PageInfo;
public interface UserService {
    PageInfo<User> findByPage(Integer start, Integer size, User param);
}

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2).创建实现类UserServiceImpl.java

package com.bandaotixi.front.core.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.bandaotixi.front.core.dao.UserMapper;
import com.bandaotixi.front.core.entity.User;
import com.bandaotixi.front.core.entity.UserExample;
import com.bandaotixi.front.core.service.UserService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
    @Override
    public PageInfo<User> findByPage(Integer start,Integer size,User param){
        PageHelper.startPage(start, size);
        UserExample example=new UserExample();
//      example.createCriteria().andLoginNameLike("%"+param.getLoginName()+"%");
        return new PageInfo<User>(userMapper.selectByExample(example));
    }
}

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4.创建UserController.java

package com.bandaotixi.front.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.bandaotixi.front.core.entity.User;
import com.bandaotixi.front.core.service.UserService;
import com.github.pagehelper.PageInfo;
@Controller
@RequestMapping("user")
public class UserController {
    @Autowired private UserService userService;
    @RequestMapping("findByPage")
    public @ResponseBody PageInfo<User> findByPage(){
        User user=new User();
        user.setLoginName("test");
        return userService.findByPage(1, 2, user);
    }
}

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5.创建启动类Application.java

1).在tomcat中启动

package com.bandaotixi.front;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
 * 程序入口
 * 
 * @author XiRuiQiang
 */
@SpringBootApplication
@MapperScan(basePackages = "com.bandaotixi.front.core.dao")
public class Application {
//这里用tomcat启动时读取两遍，请大神帮忙，留言解决
}

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2).直接用java命令运行 
添加main方法直接启动

public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
}

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需要在配置文件中添加tomcat配置：

server:
    port: 8443

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6.最后附上创建表sql

CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `avatar_url` varchar(255) DEFAULT NULL,
  `burg` varchar(10) DEFAULT NULL,
  `card_id` varchar(20) DEFAULT NULL,
  `city` varchar(10) DEFAULT NULL,
  `country` varchar(10) DEFAULT NULL,
  `create_by` varchar(32) DEFAULT NULL,
  `create_date` datetime DEFAULT NULL,
  `gender` int(1) DEFAULT NULL,
  `login_name` varchar(32) DEFAULT NULL,
  `name` varchar(32) DEFAULT NULL,
  `open_id` varchar(72) DEFAULT NULL,
  `password` varchar(64) DEFAULT NULL,
  `phone` varchar(11) DEFAULT NULL,
  `province` varchar(10) DEFAULT NULL,
  `type` int(2) DEFAULT NULL,
  `update_by` varchar(32) DEFAULT NULL,
  `update_date` datetime DEFAULT NULL,
  PRIMARY KEY (`id`)
);
上面搭建是成功了但是存在一个问题。springboot 的那个核心启动main  必须在文件目录的根目录下，不然访问不到控制层