我想创建一个DatabaseConfig类来设置我的数据库相关内容(EntityManager,DataSource,TransactionManager)并获取我在@Value("${property.name}")
字段上使用String
的属性
像
@Configuration
public class DataBaseConfig {
@Value("${hibernate.connection.username}")
private String hibernateConnectionUsername;
@Value("${hibernate.connection.password}")
private String hibernateConnectionPassword;
@Value("${hibernate.connection.driver_class}")
private String hibernateConnectionDriverClass;
@Value("${hibernate.connection.url}")
private String hibernateConnectionUrl;
@Value("${hibernate.dialect}")
private String hibernateDialect;
@Value("${hibernate.showSql}")
private String hibernateShowSql;
@Value("${hibernate.generateDdl}")
private String hibernateGenerateDdl;
// All my @Beans
}
问题是,所有这些字符串都是NULL而不是我的属性文件的值。
如果我将代码放入我的Application
类(具有main
并且在SpringApplication.run(Application.class, args);
中引用的类),则值注入工作
简而言之,@ Value在我的Application类中工作,但不在我的自定义@Configuration类中:(
可能有什么不对?或者需要更多信息?
更新:更多代码
方法1,我的Application.java中的DB Config和@Value使用和不使用PropertySourcesPlaceholderConfigurer
import java.beans.PropertyVetoException;
import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import com.mchange.v2.c3p0.ComboPooledDataSource;
@Configuration
@ComponentScan
@EnableJpaRepositories
@EnableAutoConfiguration(exclude = HibernateJpaAutoConfiguration.class)
public class Application {
public static void main(String[] args) throws Throwable {
SpringApplication.run(Application.class, args);
}
// @Bean
// public static PropertySourcesPlaceholderConfigurer properties() {
// PropertySourcesPlaceholderConfigurer pspc = new PropertySourcesPlaceholderConfigurer();
// pspc.setLocations(new Resource[] { new ClassPathResource("application.properties") });
// return pspc;
// }
/*****************************/
@Value("${hibernate.connection.username}")
private String hibernateConnectionUsername;
@Value("${hibernate.connection.password}")
private String hibernateConnectionPassword;
@Value("${hibernate.connection.driver_class}")
private String hibernateConnectionDriverClass;
@Value("${hibernate.connection.url}")
private String hibernateConnectionUrl;
@Value("${hibernate.dialect}")
private String hibernateDialect;
@Value("${hibernate.showSql}")
private String hibernateShowSql;
@Value("${hibernate.generateDdl}")
private String hibernateGenerateDdl;
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
vendorAdapter.setDatabasePlatform(hibernateDialect);
boolean generateDdl = Boolean.parseBoolean(hibernateGenerateDdl);
boolean showSql = Boolean.parseBoolean(hibernateShowSql);
vendorAdapter.setGenerateDdl(generateDdl);
vendorAdapter.setShowSql(showSql);
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setJpaVendorAdapter(vendorAdapter);
factory.setDataSource(dataSource());
factory.setPackagesToScan("xxx");
return factory;
}
@Bean
public DataSource dataSource() {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setUser(hibernateConnectionUsername);
dataSource.setPassword(hibernateConnectionPassword);
try {
dataSource.setDriverClass(hibernateConnectionDriverClass);
} catch (PropertyVetoException e) {
throw new IllegalArgumentException("Wrong driver class");
}
dataSource.setJdbcUrl(hibernateConnectionUrl);
return dataSource;
}
@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
return new JpaTransactionManager(entityManagerFactory);
}
}
方式2(我想拥有的),DB Stuff在自己的文件(DatabaseConfing.java)中不起作用我所拥有的PropertySourcesPlaceholderConfigurer
(应用程序或DatabaseConfig),因为它始终被称为DatabaseConfig中的@Beans :(
import java.beans.PropertyVetoException;
import java.util.ArrayList;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import com.mchange.v2.c3p0.ComboPooledDataSource;
@Configuration
public class DatabaseConfig {
@Value("${hibernate.connection.username}")
private String hibernateConnectionUsername;
@Value("${hibernate.connection.password}")
private String hibernateConnectionPassword;
@Value("${hibernate.connection.driver_class}")
private String hibernateConnectionDriverClass;
@Value("${hibernate.connection.url}")
private String hibernateConnectionUrl;
@Value("${hibernate.dialect")
private String hibernateDialect;
@Value("${hibernate.showSql}")
private String hibernateShowSql;
@Value("${hibernate.generateDdl}")
private String hibernateGenerateDdl;
// @Bean
// public static PropertySourcesPlaceholderConfigurer properties() {
// PropertySourcesPlaceholderConfigurer pspc = new PropertySourcesPlaceholderConfigurer();
// pspc.setLocations(new Resource[] { new ClassPathResource("application.properties") });
// return pspc;
// }
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
vendorAdapter.setDatabasePlatform(hibernateDialect);
boolean generateDdl = Boolean.parseBoolean(hibernateGenerateDdl);
boolean showSql = Boolean.parseBoolean(hibernateShowSql);
vendorAdapter.setGenerateDdl(generateDdl);
vendorAdapter.setShowSql(showSql);
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setJpaVendorAdapter(vendorAdapter);
factory.setDataSource(dataSource());
factory.setPackagesToScan("xxx");
return factory;
}
@Bean
public DataSource dataSource() {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setUser(hibernateConnectionUsername);
dataSource.setPassword(hibernateConnectionPassword);
try {
dataSource.setDriverClass(hibernateConnectionDriverClass);
} catch (PropertyVetoException e) {
throw new IllegalArgumentException("Wrong driver class");
}
System.err.println(hibernateConnectionUrl);
dataSource.setJdbcUrl(hibernateConnectionUrl);
return dataSource;
}
}
答案 0 :(得分:9)
而不是DatabaseConfig
将以下application.properties
添加到src/main/resources
(从而删除您的DatabaseConfig
课程)
#DataSource configuration
spring.datasource.driverClassName=<hibernateConnectionDriverClass>
spring.datasource.url=<hibernateConnectionUrl>
spring.datasource.username=<hibernateConnectionUsername>
spring.datasource.password=<hibernateConnectionPassword>
#JPA/HIbernate
spring.jpa.database-platform=<dialect-class>
spring.jpa.generate-ddl=<hibernateGenerateDdl>
spring.jpa.show-sql=<hibernateShowSql>
替换&lt;占位符&gt; 与实际值和spring-boot将处理此问题。
提示删除C3P0依赖关系,因为Spring将为您提供(默认)tomcat连接池(更新且更加活跃地维护,尽管名称在没有/不在Tomcat之外的情况下完全可用)。
答案 1 :(得分:1)
@Import({ CacheConfig.class, DatabaseConfig.class })
@ComponentScan(excludeFilters = @Filter(Configuration.class))
做了这个伎俩。