刚刚接触springboot,对很多东西都不熟悉,例如,它的注解方式,他的配置方式等;听说它很牛逼,所以就尝试着去学习。在基本熟悉springboot的第一个程序之后。想到当时spring整合mybatis时使用了数据源连接数据库,所以自己也想尝试使用c3p0连接数据库。所以就有了以下的内容:
首先第一步,创建maven项目导入包:
pom.xml
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< parent > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-parent</ artifactId > < version >1.4.1.RELEASE</ version > </ parent > < dependencies > < dependency > < groupId >junit</ groupId > < artifactId >junit</ artifactId > < version >4.12</ version > < scope >test</ scope > </ dependency > < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-test</ artifactId > < version >1.4.1.RELEASE</ version > </ dependency > < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-web</ artifactId > < version >1.4.1.RELEASE</ version > </ dependency > < dependency > < groupId >org.mybatis.spring.boot</ groupId > < artifactId >mybatis-spring-boot-starter</ artifactId > < version >1.1.1</ version > </ dependency > < dependency > < artifactId >mysql-connector-java</ artifactId > < version >5.1.33</ version > </ dependency > < dependency > < groupId >c3p0</ groupId > < artifactId >c3p0</ artifactId > < version >0.9.1.2</ version > </ dependency > </ dependencies > < build > < plugins > < plugin > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-maven-plugin</ artifactId > </ plugin > </ plugins > </ build > |
应用服务类
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import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication @MapperScan (value= "com.myk.spring.t3" ) //扫描mapper包 @EnableAutoConfiguration //自动载入应用程序所需的所有Bean,当使用Exclude这个属性时,是禁止自动配置某个类 public class Application { public static void main(String[] args) { SpringApplication.run(Application. class , args); } } |
配置文件内容(配置数据库)
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datasource: url: jdbc:mysql: //ip:port/databaseName driver- class : com.mysql.jdbc.Driver username: *** password: *** |
准备无误,尝试启用应用服务,没有报错即可继续配置数据源,尝试很多方法,自己注入是不可能的,所以,我就想到spring的配置,尝试按照那样的方式去配置,所以,DataSourceConfig.java
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import javax.sql.DataSource; import org.mybatis.spring.SqlSessionFactoryBean; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Primary; import com.mchange.v2.c3p0.ComboPooledDataSource; @Configuration public class DataSourceConfig { @Bean (name= "dataSource" ) @Qualifier (value= "dataSource" ) //限定描述符除了能根据名字进行注入,但能进行更细粒度的控制如何选择候选者 @Primary //用@Primary区分主数据源 @ConfigurationProperties (prefix= "c3p0.primary" ) //指定配置文件中,前缀为c3p0的属性值 public DataSource dataSource(){ return DataSourceBuilder.create().type(ComboPooledDataSource. class ).build(); //创建数据源 } /** *返回sqlSessionFactory */ @Bean public SqlSessionFactoryBean sqlSessionFactoryBean(){ SqlSessionFactoryBean sqlSessionFactory = new SqlSessionFactoryBean(); sqlSessionFactory.setDataSource(dataSource()); return sqlSessionFactory; } } |
也许会有疑问,为什么这里只需要一个sqlSessionFactory,这个具体要去熟悉spring整合mybatis。还有看看底层就明白了
这样就可以自动装配了。
数据源都准备好了,尝试连接数据库吧
编辑接口
ExamPleMapper.java
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import java.util.List; public interface ExamPleMapper { public List<Users> getUsers(); } |
编辑Mapper xml文件
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<? 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.*.ExamPleMapper" > < select id = "getUsers" resultType = "com.*.Users" > select * from users </ select > </ mapper > |
编辑实体类,因为要将结果反射到bean类中
Users.java
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public class Users { private int userid; private String username; @Override public String toString() { return "Users [userid=" + userid + ", username=" + username + "]" ; } public int getUserid() { return userid; } public void setUserid( int userid) { this .userid = userid; } public String getUsername() { return username; } public void setUsername(String username) { this .username = username; } public Users( int userid, String username) { super (); this .userid = userid; this .username = username; } public Users() { super (); // TODO Auto-generated constructor stub } } |
编辑实现
Example2.java
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import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping (value= "/example2" ) //映射 public class Example2 { @Autowired public ExamPleMapper examPleMapper; @ResponseBody @RequestMapping (value= "/gu" ) public List<Users> getUsers(){ return examPleMapper.getUsers(); } } |
输入地址:http://localhost:8080/example2/gu
面显示结果:
[{“userid”:1,”username”:”as”},{“userid”:2,”username”:”we”},{“userid”:3,”username”:”zx”}]
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/maiyikai/article/details/70791911