在命令行配置參數(shù)

使用jar包啟動的時候，參數(shù)必須以 -- 開頭參數(shù)放在結(jié)尾，或者使用-D開頭，參數(shù)放在開始才符合jar參數(shù)規(guī)范
使用 mvn啟動時，參數(shù)必須以 -D開頭才符合mvn參數(shù)規(guī)范

java -jar target/demo.jar --spring.profiles.active=dev 
# 或者
java -Dspring.profiles.active=dev -jar target/demo.jar
mvn spring-boot:run -Dspring.profiles.active=dev 

創(chuàng)建一個普通的非執(zhí)行的jar包(library)

移除pom文件中的spring-boot-maven-plugin

多數(shù)據(jù)源和Mybatis配置

java例子

@Configuration
// sqlSessionFactoryRef必填，否則使用@Primary注解的SqlSessionFactory
@MapperScan(value = "com.demo.app.mapper",
    sqlSessionFactoryRef = Demo1Config.SQL_SESSION_FACTORY)
@EnableTransactionManagement(proxyTargetClass = true)
public class Demo1Config {
    public static final String SQL_SESSION_FACTORY = "mybatisSqlSessionFactoryApp";
    // ac-adaptor
    @Bean
    @ConfigurationProperties("spring.datasource.demo1")
    public DataSource dataSourceApp() {
        DataSource dataSource = DruidDataSourceBuilder.create().build();
        return dataSource;
    }

    @Bean
    public DataSourceTransactionManager txManagerApp() {
        DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();
        dataSourceTransactionManager.setDataSource(dataSourceApp());
        return dataSourceTransactionManager;
    }

    @Bean(name = AcAppAdaptorConfig.SQL_SESSION_FACTORY)
    public SqlSessionFactory mybatisSqlSessionFactoryApp() throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSourceApp());
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                                              .getResources(
                                                  "classpath*:config/mapper/com/demo/app/mapper/*.xml"));
        return sessionFactory.getObject();
    }
}

第二個數(shù)據(jù)源

@Configuration
@MapperScan(value = "com.petkit.ac.adaptor.chain.mapper",
    sqlSessionFactoryRef = AcChainAdaptorConfig.SQL_SESSION_FACTORY)
@EnableTransactionManagement(proxyTargetClass = true)
public class AcChainAdaptorConfig {

    public static final String SQL_SESSION_FACTORY = "mybatisSqlSessionFactoryChain";
    // ac-adaptor

    @Bean(name = AcChainAdaptorConfig.SQL_SESSION_FACTORY)
    public SqlSessionFactory mybatisSqlSessionFactoryChain(@Autowired DataSource dataSource)
        throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                                              .getResources(
                                                  "classpath*:config/mapper/com/petkit/ac/adaptor/chain/mapper/*.xml"));
        return sessionFactory.getObject();
    }

}

打包war包以部署在tomcat下

pom配置

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

入口類

@SpringBootApplication
public class DemoApplication extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(DemoApplication.class);
    }

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

讀取jar包外部配置文件

Spring-boot在啟動時，如果不指定spring.config.location，將會從下面路徑中依次加載application.properties中的屬性:

• A /config subdirectory of the current directory. (即當(dāng)前啟動spring-boot程序文件夾的/config路徑)
• The current directory(即當(dāng)前啟動spring-boot程序文件夾的./路徑)
• A classpath /config package (當(dāng)前jar/war包 classpath的/config路徑)
• The classpath root (當(dāng)前jar/war包 classpath的./路徑)
  以上是優(yōu)先級從大到小排序，高優(yōu)先級的會覆蓋低優(yōu)先的值
  其中，如果激活了spring.profiles.active=xx，那么active的properties的優(yōu)先級是最高的，所以如果使用外部文件配置，最好不要激活profiles

方法一

java -jar demo.jar --spring.config.location=/opt/dev/demo.properties
或者
java -Dspring.config.location=/opt/dev/demo.properties -jar demo.jar 

此時/opt/dev/demo.properties的優(yōu)先級是最高的

方法二

@SpringBootApplication
@PropertySources({
    @PropertySource("classpath:application.properties"),
    // 引用外部配置文件，不會覆蓋已有屬性,file開頭的優(yōu)先級最低
    @PropertySource(value="file:${external.config}", ignoreResourceNotFound=true)
})
public class ChainBootApplication extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(ChainBootApplication.class);
    }

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