本文使用的是springboot2.0（在配置数据源时和springboot1.X略有区别）
首先：springboot默认支持的连接池有dbcp,dbcp2, tomcat, hikari四种连接池
- 由于Tomcat数据源连接池的性能和并发，在tomcat可用时，我们总是优先使用它。
- 如果HikariCP可用，我们将使用它。
- 如果Commons DBCP可用，我们将使用它，但在生产环境不推荐使用它。
- 最后，如果Commons DBCP2可用，我们将使用它
即自动优先级tomcat>HikariCP>DBCP>DBCP2（想要使用后面的连接池需要指定类型type：如：spring.datasource.ccjoin-settlement.type=org.apache.commons.dbcp2.BasicDataSource）
本例使用的是用多数据源，不同连接池：
需要的包：
spring-boot-starter-web(包含自带的tomcat)、mybatis-spring-boot-starter
springboot数据库连接：
有两种方法与数据库建立连接，一种是集成Mybatis，另一种用JdbcTemplate
用JdbcTemplate需要的包：
mysql-connector-java、spring-boot-starter-jdbc
集成mybatis需要的包：
mysql-connector-java、spring-boot-starter-jdbc、mybatis-spring-boot-starter
首先：目录结构如下
pom.xml如下
1 23 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4 4.0.0 5 6com.jmu.ccjoin 7spring-boot 80.0.1-SNAPSHOT 9war 10 11spring-boot 12spring-boot 13 1415 20 21org.springframework.boot 16spring-boot-starter-parent 172.0.4.RELEASE 1819 22 26 27UTF-8 23UTF-8 241.8 2528 88 8929 32 33 34org.springframework.boot 30spring-boot-starter-web 3135 39 40org.springframework.boot 36spring-boot-starter-tomcat 37 3841 45 46org.mybatis.spring.boot 42mybatis-spring-boot-starter 431.3.2 4447 51 52mysql 48mysql-connector-java 49runtime 5053 56 57 58org.springframework.boot 54spring-boot-starter-jdbc 5559 62 63 64org.apache.commons 60commons-dbcp2 6165 69 70 71commons-dbcp 66commons-dbcp 671.4 6872 76 77com.alibaba 73druid 741.1.10 7578 82org.springframework.boot 79spring-boot-starter-test 80test 8183 87org.springframework.boot 84spring-boot-configuration-processor 85false 8690 105 106spring-boot 9192 10493 103org.springframework.boot 94spring-boot-maven-plugin 9596 10297 10198 100repackage 99
ConfigProperties.java(把配置文件封装到bean并注入spring容器)
1 package com.jmu.ccjoin.config; 2 3 import org.springframework.beans.factory.annotation.Value; 4 import org.springframework.context.annotation.PropertySource; 5 import org.springframework.stereotype.Component; 6 7 @Component 8 @PropertySource("file:/var/opt/spring-boot-test/config.properties") 9 public class ConfigProperties { 10 11 @Value("${spring.datasource.jmuv3.jdbc-url}") 12 private String jmuv3Url; 13 14 @Value("${spring.datasource.jmuv3.driver-class-name}") 15 private String jmuv3DriverClassName; 16 17 @Value("${spring.datasource.jmuv3.username}") 18 private String jmuv3Username; 19 20 @Value("${spring.datasource.jmuv3.password}") 21 private String jmuv3Password; 22 23 @Value("${spring.datasource.ccjoin-settlement.jdbc-url}") 24 private String ccjoinSettlementUrl; 25 26 @Value("${spring.datasource.ccjoin-settlement.driver-class-name}") 27 private String ccjoinSettlementDriverClassName; 28 29 @Value("${spring.datasource.ccjoin-settlement.username}") 30 private String ccjoinSettlementUsername; 31 32 @Value("${spring.datasource.ccjoin-settlement.password}") 33 private String ccjoinSettlementPassword; 34 35 @Value("${spring.datasource.ccjoin-settlement.type}") 36 private String ccjoinSettlementType; 37 38 @Value("${spring.datasource.jmu-mp.jdbc-url}") 39 private String jmuMpUrl; 40 41 @Value("${spring.datasource.jmu-mp.driver-class-name}") 42 private String jmuMpDriverClassName; 43 44 @Value("${spring.datasource.jmu-mp.username}") 45 private String jmuMpUsername; 46 47 @Value("${spring.datasource.jmu-mp.password}") 48 private String jmuMpPassword; 49 50 /** 51 * jmuv3Url的取得 52 * 53 * @return String jmuv3Url 54 */ 55 public String getJmuv3Url() { 56 return jmuv3Url; 57 } 58 59 /** 60 * jmuv3Url的设定 61 * 62 * @param jmuv3Url 63 * jmuv3Url 64 */ 65 public void setJmuv3Url(String jmuv3Url) { 66 this.jmuv3Url = jmuv3Url; 67 } 68 69 /** 70 * jmuv3DriverClassName的取得 71 * 72 * @return String jmuv3DriverClassName 73 */ 74 public String getJmuv3DriverClassName() { 75 return jmuv3DriverClassName; 76 } 77 78 /** 79 * jmuv3DriverClassName的设定 80 * 81 * @param jmuv3DriverClassName 82 * jmuv3DriverClassName 83 */ 84 public void setJmuv3DriverClassName(String jmuv3DriverClassName) { 85 this.jmuv3DriverClassName = jmuv3DriverClassName; 86 } 87 88 /** 89 * jmuv3Username的取得 90 * 91 * @return String jmuv3Username 92 */ 93 public String getJmuv3Username() { 94 return jmuv3Username; 95 } 96 97 /** 98 * jmuv3Username的设定 99 * 100 * @param jmuv3Username 101 * jmuv3Username 102 */ 103 public void setJmuv3Username(String jmuv3Username) { 104 this.jmuv3Username = jmuv3Username; 105 } 106 107 /** 108 * jmuv3Password的取得 109 * 110 * @return String jmuv3Password 111 */ 112 public String getJmuv3Password() { 113 return jmuv3Password; 114 } 115 116 /** 117 * jmuv3Password的设定 118 * 119 * @param jmuv3Password 120 * jmuv3Password 121 */ 122 public void setJmuv3Password(String jmuv3Password) { 123 this.jmuv3Password = jmuv3Password; 124 } 125 126 /** 127 * ccjoinSettlementUrl的取得 128 * 129 * @return String ccjoinSettlementUrl 130 */ 131 public String getCcjoinSettlementUrl() { 132 return ccjoinSettlementUrl; 133 } 134 135 /** 136 * ccjoinSettlementUrl的设定 137 * 138 * @param ccjoinSettlementUrl 139 * ccjoinSettlementUrl 140 */ 141 public void setCcjoinSettlementUrl(String ccjoinSettlementUrl) { 142 this.ccjoinSettlementUrl = ccjoinSettlementUrl; 143 } 144 145 /** 146 * ccjoinSettlementDriverClassName的取得 147 * 148 * @return String ccjoinSettlementDriverClassName 149 */ 150 public String getCcjoinSettlementDriverClassName() { 151 return ccjoinSettlementDriverClassName; 152 } 153 154 /** 155 * ccjoinSettlementDriverClassName的设定 156 * 157 * @param ccjoinSettlementDriverClassName 158 * ccjoinSettlementDriverClassName 159 */ 160 public void setCcjoinSettlementDriverClassName(String ccjoinSettlementDriverClassName) { 161 this.ccjoinSettlementDriverClassName = ccjoinSettlementDriverClassName; 162 } 163 164 /** 165 * ccjoinSettlementUsername的取得 166 * 167 * @return String ccjoinSettlementUsername 168 */ 169 public String getCcjoinSettlementUsername() { 170 return ccjoinSettlementUsername; 171 } 172 173 /** 174 * ccjoinSettlementUsername的设定 175 * 176 * @param ccjoinSettlementUsername 177 * ccjoinSettlementUsername 178 */ 179 public void setCcjoinSettlementUsername(String ccjoinSettlementUsername) { 180 this.ccjoinSettlementUsername = ccjoinSettlementUsername; 181 } 182 183 /** 184 * ccjoinSettlementPassword的取得 185 * 186 * @return String ccjoinSettlementPassword 187 */ 188 public String getCcjoinSettlementPassword() { 189 return ccjoinSettlementPassword; 190 } 191 192 /** 193 * ccjoinSettlementPassword的设定 194 * 195 * @param ccjoinSettlementPassword 196 * ccjoinSettlementPassword 197 */ 198 public void setCcjoinSettlementPassword(String ccjoinSettlementPassword) { 199 this.ccjoinSettlementPassword = ccjoinSettlementPassword; 200 } 201 202 /** 203 * ccjoinSettlementType的取得 204 * 205 * @return String ccjoinSettlementType 206 */ 207 public String getCcjoinSettlementType() { 208 return ccjoinSettlementType; 209 } 210 211 /** 212 * ccjoinSettlementType的设定 213 * 214 * @param ccjoinSettlementType 215 * ccjoinSettlementType 216 */ 217 public void setCcjoinSettlementType(String ccjoinSettlementType) { 218 this.ccjoinSettlementType = ccjoinSettlementType; 219 } 220 221 /** 222 * jmuMpUrl的取得 223 * 224 * @return String jmuMpUrl 225 */ 226 public String getJmuMpUrl() { 227 return jmuMpUrl; 228 } 229 230 /** 231 * jmuMpUrl的设定 232 * 233 * @param jmuMpUrl 234 * jmuMpUrl 235 */ 236 public void setJmuMpUrl(String jmuMpUrl) { 237 this.jmuMpUrl = jmuMpUrl; 238 } 239 240 /** 241 * jmuMpDriverClassName的取得 242 * 243 * @return String jmuMpDriverClassName 244 */ 245 public String getJmuMpDriverClassName() { 246 return jmuMpDriverClassName; 247 } 248 249 /** 250 * jmuMpDriverClassName的设定 251 * 252 * @param jmuMpDriverClassName 253 * jmuMpDriverClassName 254 */ 255 public void setJmuMpDriverClassName(String jmuMpDriverClassName) { 256 this.jmuMpDriverClassName = jmuMpDriverClassName; 257 } 258 259 /** 260 * jmuMpUsername的取得 261 * 262 * @return String jmuMpUsername 263 */ 264 public String getJmuMpUsername() { 265 return jmuMpUsername; 266 } 267 268 /** 269 * jmuMpUsername的设定 270 * 271 * @param jmuMpUsername 272 * jmuMpUsername 273 */ 274 public void setJmuMpUsername(String jmuMpUsername) { 275 this.jmuMpUsername = jmuMpUsername; 276 } 277 278 /** 279 * jmuMpPassword的取得 280 * 281 * @return String jmuMpPassword 282 */ 283 public String getJmuMpPassword() { 284 return jmuMpPassword; 285 } 286 287 /** 288 * jmuMpPassword的设定 289 * 290 * @param jmuMpPassword 291 * jmuMpPassword 292 */ 293 public void setJmuMpPassword(String jmuMpPassword) { 294 this.jmuMpPassword = jmuMpPassword; 295 } 296 297 }
DataSourceConfigCcjoinSettlement.java（使用DBCP2连接池，优先级较低，有tomcat自带JDBC连接池时需要指定数据源类型type）
注意 @ConfigurationProperties注解不支持驼峰式
1 package com.jmu.ccjoin.config; 2 3 import javax.sql.DataSource; 4 5 import org.apache.ibatis.session.SqlSessionFactory; 6 import org.mybatis.spring.SqlSessionFactoryBean; 7 import org.mybatis.spring.annotation.MapperScan; 8 import org.springframework.beans.factory.annotation.Autowired; 9 import org.springframework.beans.factory.annotation.Qualifier; 10 import org.springframework.boot.context.properties.ConfigurationProperties; 11 import org.springframework.boot.jdbc.DataSourceBuilder; 12 import org.springframework.context.annotation.Bean; 13 import org.springframework.context.annotation.Configuration; 14 import org.springframework.context.annotation.Primary; 15 import org.springframework.core.env.Environment; 16 import org.springframework.core.io.support.PathMatchingResourcePatternResolver; 17 import org.springframework.jdbc.datasource.DataSourceTransactionManager; 18 19 @Configuration 20 @MapperScan(basePackages = "com.jmu.ccjoin.dao.ccjoinSettlement", sqlSessionFactoryRef = "sqlSessionFactoryCcjoinSettlement") 21 public class DataSourceConfigCcjoinSettlement { 22 23 @Autowired 24 private Environment env; 25 26 @Bean(name = "ccjoinSettlement") 27 @ConfigurationProperties(prefix = "spring.datasource.ccjoin-settlement") 28 public DataSource dataSourceCcjoinSettlement() { 29 // 使用DBCP2数据源(在配置文件配置所使用的数据源类型) 30 return DataSourceBuilder.create().build(); 31 } 32 33 @Bean(name = "sqlSessionFactoryCcjoinSettlement") 34 public SqlSessionFactory createSqlSessionFactory(@Qualifier("ccjoinSettlement") DataSource ds) throws Exception { 35 36 SqlSessionFactoryBean fb = new SqlSessionFactoryBean(); 37 fb.setDataSource(ds); 38 39 fb.setTypeAliasesPackage(env.getProperty("spring.mybatis.typeAliasPackage")); 40 fb.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(env.getProperty("spring.mybatis.mapper.ccjoinSettlement"))); 41 42 return fb.getObject(); 43 } 44 45 @Bean(name = "transactionManagerCcjoinSettlement") 46 @Primary 47 public DataSourceTransactionManager transactionManager(@Qualifier("ccjoinSettlement") DataSource ds) throws Exception { 48 return new DataSourceTransactionManager(ds); 49 } 50 }
DataSourceConfigJmuMp.java（使用第三方数据源阿里连接池Druid）
1 package com.jmu.ccjoin.config; 2 3 import javax.sql.DataSource; 4 5 import org.apache.ibatis.session.SqlSessionFactory; 6 import org.mybatis.spring.SqlSessionFactoryBean; 7 import org.mybatis.spring.annotation.MapperScan; 8 import org.springframework.beans.factory.annotation.Autowired; 9 import org.springframework.beans.factory.annotation.Qualifier; 10 import org.springframework.boot.context.properties.ConfigurationProperties; 11 import org.springframework.context.annotation.Bean; 12 import org.springframework.context.annotation.Configuration; 13 import org.springframework.context.annotation.Primary; 14 import org.springframework.core.env.Environment; 15 import org.springframework.core.io.support.PathMatchingResourcePatternResolver; 16 import org.springframework.jdbc.datasource.DataSourceTransactionManager; 17 18 import com.alibaba.druid.pool.DruidDataSource; 19 20 @Configuration 21 @MapperScan(basePackages = "com.jmu.ccjoin.dao.jmuMp",sqlSessionFactoryRef="sqlSessionFactoryJmuMp" ) 22 public class DataSourceConfigJmuMp { 23 24 @Autowired 25 private ConfigProperties configProperties; 26 27 @Autowired 28 private Environment env; 29 30 @Bean(name = "jmuMp") 31 @ConfigurationProperties(prefix = "spring.datasource.jmu-mp") 32 public DataSource dataSourceJmuMp() { 33 34 // 使用Druid连接池 35 DruidDataSource ds = new DruidDataSource(); 36 ds.setUrl(configProperties.getJmuMpUrl()); 37 ds.setUsername(configProperties.getJmuMpUsername()); 38 ds.setPassword(configProperties.getJmuMpPassword()); 39 40 return ds; 41 } 42 43 @Bean(name = "sqlSessionFactoryJmuMp") 44 public SqlSessionFactory createSqlSessionFactory(@Qualifier("jmuMp") DataSource ds) throws Exception { 45 46 SqlSessionFactoryBean fb = new SqlSessionFactoryBean(); 47 fb.setDataSource(ds); 48 49 fb.setTypeAliasesPackage(env.getProperty("spring.mybatis.typeAliasPackage")); 50 fb.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(env.getProperty("spring.mybatis.mapper.jmuMp"))); 51 52 return fb.getObject(); 53 } 54 55 @Bean(name = "transactionManagerJmuMp") 56 @Primary 57 public DataSourceTransactionManager transactionManager(@Qualifier("jmuMp") DataSource ds) throws Exception { 58 return new DataSourceTransactionManager(ds); 59 } 60 }
DataSourceConfigJmuv3.java（使用Tomcat自带的的jdbc连接池）
1 package com.jmu.ccjoin.config; 2 3 import javax.sql.DataSource; 4 5 import org.apache.ibatis.session.SqlSessionFactory; 6 import org.mybatis.spring.SqlSessionFactoryBean; 7 import org.mybatis.spring.annotation.MapperScan; 8 import org.springframework.beans.factory.annotation.Autowired; 9 import org.springframework.beans.factory.annotation.Qualifier; 10 import org.springframework.boot.context.properties.ConfigurationProperties; 11 import org.springframework.boot.jdbc.DataSourceBuilder; 12 import org.springframework.context.annotation.Bean; 13 import org.springframework.context.annotation.Configuration; 14 import org.springframework.context.annotation.Primary; 15 import org.springframework.core.env.Environment; 16 import org.springframework.core.io.support.PathMatchingResourcePatternResolver; 17 import org.springframework.jdbc.datasource.DataSourceTransactionManager; 18 19 @Configuration 20 @MapperScan(basePackages = "com.jmu.ccjoin.dao.jmuv3", sqlSessionFactoryRef = "sqlSessionFactoryJmuv3") 21 public class DataSourceConfigJmuv3 { 22 23 @Autowired 24 private Environment env; 25 26 @Bean(name = "jmuv3") 27 @Primary 28 @ConfigurationProperties(prefix = "spring.datasource.jmuv3") 29 public DataSource dataSourceJmuv3() { 30 // 使用JDBC数据源 31 return DataSourceBuilder.create().build(); 32 } 33 34 @Bean(name = "sqlSessionFactoryJmuv3") 35 @Primary 36 public SqlSessionFactory createSqlSessionFactory(@Qualifier("jmuv3") DataSource ds) throws Exception { 37 38 SqlSessionFactoryBean fb = new SqlSessionFactoryBean(); 39 fb.setDataSource(ds); 40 41 fb.setTypeAliasesPackage(env.getProperty("spring.mybatis.typeAliasPackage")); 42 fb.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(env.getProperty("spring.mybatis.mapper.jmuv3"))); 43 44 return fb.getObject(); 45 } 46 47 @Bean(name = "transactionManagerJmuv3") 48 @Primary 49 public DataSourceTransactionManager transactionManager(@Qualifier("jmuv3") DataSource ds) throws Exception { 50 return new DataSourceTransactionManager(ds); 51 } 52 }
Application.java
1 package com.jmu.ccjoin; 2 3 import org.springframework.boot.SpringApplication; 4 import org.springframework.boot.autoconfigure.SpringBootApplication; 5 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration; 6 import org.springframework.boot.builder.SpringApplicationBuilder; 7 import org.springframework.boot.web.servlet.support.SpringBootServletInitializer; 8 9 @SpringBootApplication(exclude = DataSourceAutoConfiguration.class) 10 public class Application extends SpringBootServletInitializer { 11 12 public static void main(String[] args) { 13 SpringApplication.run(Application.class, args); 14 } 15 16 @Override 17 protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) { 18 return builder.sources(Application.class); 19 } 20 }
application.yml配置文件
1 server: 2 port: 20001 3 servlet: 4 path: /spring-boot 5 6 spring: 7 mybatis: 8 typeAliasPackage: com.jmu.ccjoin.entity 9 mapper: 10 jmuv3: classpath:mybatis/mysql/jmuv3/*.xml 11 ccjoinSettlement: classpath:mybatis/mysql/ccjoinSettlement/*.xml 12 jmuMp: classpath:mybatis/mysql/jmuMp/*.xml 13 14
外部配置文件（路径：D:\var\opt\spring-boot-test\config.properties）
1 # 数据源1配置 2 spring.datasource.jmuv3.jdbc-url=jdbc:mysql://172.16.1.23:3306/jmuv3?useUnicode=true&characterEncoding=utf8 3 spring.datasource.jmuv3.driver-class-name=com.mysql.jdbc.Driver 4 spring.datasource.jmuv3.username=root 5 spring.datasource.jmuv3.password=123.com 6 #数据源1的连接池（使用默认即tomcat自带的JDBC连接池） 7 8 # 数据源2配置 9 spring.datasource.ccjoin-settlement.jdbc-url=jdbc:mysql://172.16.1.23:3306/ccjoin_settlement?useUnicode=true&characterEncoding=utf8 10 spring.datasource.ccjoin-settlement.driver-class-name=com.mysql.jdbc.Driver 11 spring.datasource.ccjoin-settlement.username=root 12 spring.datasource.ccjoin-settlement.password=123.com 13 #数据源2的连接池配置（使用DBCP2连接池，也是springboot支持的连接池之一） 14 spring.datasource.ccjoin-settlement.type=org.apache.commons.dbcp2.BasicDataSource 15 16 # 数据源3配置 17 spring.datasource.jmu-mp.jdbc-url=jdbc:mysql://172.16.1.23:3306/jmu_mp?useUnicode=true&characterEncoding=utf8 18 spring.datasource.jmu-mp.driver-class-name=com.mysql.jdbc.Driver 19 spring.datasource.jmu-mp.username=root 20 spring.datasource.jmu-mp.password=123.com 21 #数据源3的连接池配置（使用第三方数据源，Druid） 22 23 24 #连接池配置 25 spring.datasource.max-wait-millis=10000 26 spring.datasource.min-idle=5 27 spring.datasource.initial-size=5 28 spring.datasource.validation-query=SELECT x 29 spring.datasource.connection-properties=characterEncoding=utf8
注意配置文件中配置项后面的空格