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SpringBoot项目整合mybatis的方法步骤与实例

程序员文章站 2024-03-31 13:12:16
1. 导入依赖的jar包 springboot项目整合mybatis之前首先要导入依赖的jar包，配置pom.xml文件如下：

1. 导入依赖的jar包

springboot项目整合mybatis之前首先要导入依赖的jar包，配置pom.xml文件如下：

<?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.u</groupid>
  <artifactid>springboot-mybatis</artifactid>
  <version>1.0-snapshot</version>
  <parent>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-parent</artifactid>
    <version>1.3.0.release</version>
  </parent>
  <properties>
    <start-class>com.us.application</start-class>
    <mybatis.version>3.2.7</mybatis.version>
    <mybatis-spring.version>1.2.2</mybatis-spring.version>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.source>1.8</maven.compiler.source>
  </properties>
  <dependencies>
    <!--springboot-->
    <dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-web</artifactid>
    </dependency>
    <!--db-->
    <dependency>
      <groupid>mysql</groupid>
      <artifactid>mysql-connector-java</artifactid>
      <version>6.0.5</version>
    </dependency>
    <dependency>
      <groupid>com.mchange</groupid>
      <artifactid>c3p0</artifactid>
      <version>0.9.5.2</version>
      <exclusions>
        <exclusion>
          <groupid>commons-logging</groupid>
          <artifactid>commons-logging</artifactid>
        </exclusion>
      </exclusions>
    </dependency>
    <!--mybatis-->
    <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-jdbc</artifactid>
    </dependency>
    <dependency>
      <groupid>org.mybatis</groupid>
      <artifactid>mybatis</artifactid>
      <version>${mybatis.version}</version>
    </dependency>
    <dependency>
      <groupid>org.mybatis</groupid>
      <artifactid>mybatis-spring</artifactid>
      <version>${mybatis-spring.version}</version>
    </dependency>
    <!--util-->
    <dependency>
      <groupid>org.apache.commons</groupid>
      <artifactid>commons-lang3</artifactid>
      <version>3.4</version>
    </dependency>
  </dependencies>
</project>

2. 配置数据源

pom.xml配置完毕后需要配置数据源了。新建dbconfig类配置数据源，代码如下：

import org.springframework.beans.factory.annotation.autowired;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
import org.springframework.core.env.environment;
import com.alibaba.druid.pool.druiddatasource;
import com.google.common.base.preconditions;
@configuration
public class dbconfig {
  @autowired
  private environment env;
  @bean(name = "datasource")
  public druiddatasource datasource() {
    final string url = preconditions.checknotnull(env.getproperty("ms.db.url"));
    final string username = preconditions.checknotnull(env.getproperty("ms.db.username"));
    final string password = env.getproperty("ms.db.password");
    final int maxactive = integer.parseint(env.getproperty("ms.db.maxactive", "200"));
    druiddatasource datasource = new druiddatasource();
    datasource.seturl(url);
    datasource.setusername(username);
    datasource.setpassword(password);
    datasource.setmaxactive(maxactive);
    return datasource;
  }
}

3. 添加数据库连接信息

在配置文件application.properties中添加数据库连接信息如下：

ms.db.url=jdbc:mysql://localhost:3306/dev?prepstmtcachesize=517&cacheprepstmts=true&autoreconnect=true&characterencoding=utf-8&allowmultiqueries=true
ms.db.username=root
ms.db.password=admin
ms.db.maxactive=500

4. 配置mybatis的sqlsessionfactorybean

数据源配置完以后要配置mybatis的sqlsessionfactorybean进行扫描mapper，新建mybatisconfig类代码如下（classpath*:mapper/*.xml为mapper.xml文件路径）：

import javax.sql.datasource;
import org.mybatis.spring.sqlsessionfactorybean;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.context.applicationcontext;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
@configuration
public class mybatisconfig {
  @autowired
  private datasource datasource;
  @bean(name = "sqlsessionfactory")
  public sqlsessionfactorybean sqlsessionfactory(applicationcontext applicationcontext) throws exception {
    sqlsessionfactorybean sessionfactory = new sqlsessionfactorybean();
    sessionfactory.setdatasource(datasource);
    sessionfactory.setmapperlocations(applicationcontext.getresources("classpath*:mapper/*.xml"));
    return sessionfactory;
  }
}

5. 配置mapperscannerconfigurer扫描dao层

然后配置mapperscannerconfigurer扫描dao层，新建类mybatisscannerconfig代码如下（注意与mybatisconfig不要写在一个类里）：

import org.mybatis.spring.mapper.mapperscannerconfigurer;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
@configuration
public class mybatisscannerconfig {
  @bean
  public mapperscannerconfigurer mapperscannerconfigurer() {
    mapperscannerconfigurer mapperscannerconfigurer = new mapperscannerconfigurer();
    mapperscannerconfigurer.setbasepackage("com.example.*.dao");
    mapperscannerconfigurer.setsqlsessionfactorybeanname("sqlsessionfactory");
    return mapperscannerconfigurer;
  }
}

6. 开启数据库事务（必须）代码如下

import javax.sql.datasource;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
import org.springframework.jdbc.datasource.datasourcetransactionmanager;
import org.springframework.transaction.platformtransactionmanager;
import org.springframework.transaction.annotation.transactionmanagementconfigurer;
@configuration
public class transactionconfig implements transactionmanagementconfigurer{
  @autowired
  private datasource datasource;
  @bean(name = "transactionmanager")
  @override
  public platformtransactionmanager annotationdriventransactionmanager() {
    return new datasourcetransactionmanager(datasource);
  }
}

7. 实战

配置大致就是如此，然后就是新建java bean（省略，文章底部有源码地址）

新建mapper.xml文件（省略，文章底部有源码地址，关于mapper.xml 文件编写的疑问可以看我以前的springmvc＋mybatis 系列文章）

新建dao层。代码如下：

import java.util.list;
import java.util.map;
import com.example.base.model.user;
import com.example.config.mybatisrepository;
public interface userdao {
  public list<user> getlist(map<string,object> map);
}

service层要在实现类上添加@service注解，代码如下：

import java.util.map;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.service;
import com.example.base.dao.userdao;
import com.example.base.service.userservice;
@service
public class userserviceimpl implements userservice {
  @autowired
  private userdao userdao;
  public object getlist(map<string, object> map) {
    return userdao.getlist(map);
  }
}

controller层也要加@controller注解代码如下：

import javax.servlet.http.httpservletrequest;
import java.util.map;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.http.httpstatus;
import org.springframework.http.responseentity;
import org.springframework.stereotype.controller;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.requestmethod;
import org.springframework.web.bind.annotation.responsebody;
import com.example.base.service.userservice;
import com.example.base.util.commonutil;
import com.example.demo.serviceemail;
@controller
@requestmapping(value = "/users")
public class usercontroller {
  @autowired
  private userservice userservice;
  @autowired
  private serviceemail serviceemail;
  /***
   * api :localhost:8099/users?id=99 localhost:8099/users
   * 
   * @param request
   * @return
   */
  @requestmapping(method = requestmethod.get, produces = "application/json;charset=utf-8")
  @responsebody
  public responseentity<?> list(httpservletrequest request) {
    map<string, object> map = commonutil.getparametermap(request);
    return new responseentity<object>(userservice.getlist(map), httpstatus.ok);
  }
  }

然后在启动入口类中扫描定义的这些配置累（配置包名可却省只写部分包名）如下：

import java.util.arrays;
import org.springframework.boot.springapplication;
import org.springframework.boot.autoconfigure.springbootapplication;
import org.springframework.boot.builder.springapplicationbuilder;
import org.springframework.boot.context.web.springbootservletinitializer;
import org.springframework.context.applicationcontext;
import org.springframework.context.annotation.componentscan;
import org.springframework.scheduling.annotation.enablescheduling;
@componentscan(basepackages ="com.example")
@springbootapplication
public class application extends springbootservletinitializer{
  @override
  protected springapplicationbuilder configure(springapplicationbuilder application) {
    return application.sources(application.class);
  }
  public static void main(string[] args) throws exception {
    applicationcontext ctx = springapplication.run(application.class, args);
    string[] beannames = ctx.getbeandefinitionnames();
    arrays.sort(beannames);
    for (string beanname : beannames) {
      system.out.println(beanname);
    }
  }
}

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