为什么注解@Value return 在使用 Spring PropertySourcesPlaceholderConfigurer 时总是 null？
Why Annotation @Value return always null during using Spring PropertySourcesPlaceholderConfigurer?
同事们，这似乎是一个愚蠢的问题，但我无法从属性文件中读取 属性。
我有一个 Spring 配置 class:
@EnableWs
@Configuration
@PropertySource("classpath:appl.properties")
public class WebServiceConfig extends WsConfigurerAdapter {
/*Some beans*/
@Bean
public static PropertySourcesPlaceholderConfigurer propertyConfigInDev() {
return new PropertySourcesPlaceholderConfigurer();
}
@Value("${db_name.db.url}")
private String DBUrl;
@Bean
@ConfigurationProperties(prefix="datasource.secondary")
public BasicDataSource DBDataSource() {
System.out.println("DBUrl: " + DBUrl);
BasicDataSource DBDataSource = new BasicDataSource();
DWDataSource.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
DWDataSource.setUrl(DBUrl);
DWDataSource.setUsername("user");
DWDataSource.setPassword("pass");
DWDataSource.setMaxIdle(10);
DWDataSource.setMaxWaitMillis(10000);
DWDataSource.setValidationQuery("select 1");
DWDataSource.setTestOnBorrow(false);
DWDataSource.setTestWhileIdle(true);
DWDataSource.setDefaultAutoCommit(true);
return DBDataSource;
}
}
属性文件如下所示：
#bla bla bla
#bla bla bla
#bla bla bla
db_name.db.url=jdbc:sqlserver://bla
db_name.db.user=user
db_name.db.password=pass
当我 运行 编程并尝试调用数据库时，我收到下一个堆栈跟踪：
INFO : [oct-27 10:48:48,834] service.app.WsEndpoint - Error retrieving
database metadata; nested exception is
org.springframework.jdbc.support.Me taDataAccessException: Could not
get Connection for extracting meta data; nested exception is
org.springframework.jdbc.CannotGetJdbcConnectionExc eption: Could not
get JDBC Connection; nested exception is java.sql.SQLException: Cannot
create JDBC driver of class 'com.microsoft.sqlserver.jdb
c.SQLServerDriver' for connect URL 'null'
没有其他例外。
但是在属性文件中我有 db_name.db.url=db_name.db.url=jdbc:sqlserver://bla
为什么为空？
如果我改变了
@Value("${db_name.db.url}")
private String DBWUrl;
到
@Value("${db_name.db.url}")
private String DBUrl = "jdbc:sqlserver://bla";
在 Spring 配置 Java class 我工作正常。
更新
Spring 开始记录:
. ____ _ __ _ _
/\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.2.5.RELEASE)
INFO : [oct-27 11:37:53,555] service.app.WsApplication - Starting WsApplication on MyPC with PID 6688 (C:\Users\Maya\workspace\WS\ta
rget\classes started by Maya in C:\Users\Maya\workspace\WS)
INFO : [oct-27 11:37:53,635] context.embedded.AnnotationConfigEmbeddedWebApplicationContext - Refreshing org.springframework.boot.context.embedde
d.AnnotationConfigEmbeddedWebApplicationContext@10bbd20a: startup date [Tue Oct 27 11:37:53 MSK 2015]; root of context hierarchy
INFO : [oct-27 11:37:54,868] factory.support.DefaultListableBeanFactory - Overriding bean definition for bean 'beanNameViewResolver': replacing [
Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factor
yBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewRe
solver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAut
oConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; de
pendencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvc
AutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resour
ce [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
INFO : [oct-27 11:37:55,511] internal.util.Version - HV000001: Hibernate Validator 5.1.3.Final
INFO : [oct-27 11:37:55,693] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'webServiceConfig' of type [class
com.mayacomp.service.app.WebServiceConfig$$EnhancerBySpringCGLIB$06d7b6] is not eligible for getting processed by all BeanPostProcessors
(for example: not eligible for auto-proxying)
INFO : [oct-27 11:37:55,713] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.ws.config.ann
otation.DelegatingWsConfiguration' of type [class org.springframework.ws.config.annotation.DelegatingWsConfiguration$$EnhancerBySpringCGLIB$$f512
4549] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
INFO : [oct-27 11:37:55,785] addressing.server.AnnotationActionEndpointMapping - Supporting [WS-Addressing August 2004, WS-Addressing 1.0]
INFO : [oct-27 11:37:55,864] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.transaction.a
nnotation.ProxyTransactionManagementConfiguration' of type [class org.springframework.transaction.annotation.ProxyTransactionManagementConfigurat
ion$$EnhancerBySpringCGLIB$3342a] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying
)
INFO : [oct-27 11:37:55,888] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'transactionAttributeSource' of ty
pe [class org.springframework.transaction.annotation.AnnotationTransactionAttributeSource] is not eligible for getting processed by all BeanPostP
rocessors (for example: not eligible for auto-proxying)
INFO : [oct-27 11:37:55,903] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'transactionInterceptor' of type [
class org.springframework.transaction.interceptor.TransactionInterceptor] is not eligible for getting processed by all BeanPostProcessors (for ex
ample: not eligible for auto-proxying)
INFO : [oct-27 11:37:55,909] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.transaction.c
onfig.internalTransactionAdvisor' of type [class org.springframework.transaction.interceptor.BeanFactoryTransactionAttributeSourceAdvisor] is not
eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
INFO : [oct-27 11:37:56,557] embedded.tomcat.TomcatEmbeddedServletContainer - Tomcat initialized with port(s): 8080 (http)
INFO : [oct-27 11:37:56,933] catalina.core.StandardService - Starting service Tomcat
INFO : [oct-27 11:37:56,935] catalina.core.StandardEngine - Starting Servlet Engine: Apache Tomcat/8.0.23
INFO : [oct-27 11:37:57,077] [Tomcat].[localhost].[/] - Initializing Spring embedded WebApplicationContext
INFO : [oct-27 11:37:57,078] web.context.ContextLoader - Root WebApplicationContext: initialization completed in 3447 ms
INFO : [oct-27 11:37:57,902] context.embedded.ServletRegistrationBean - Mapping servlet: 'messageDispatcherServlet' to [/services/*]
INFO : [oct-27 11:37:57,904] context.embedded.ServletRegistrationBean - Mapping servlet: 'dispatcherServlet' to [/]
INFO : [oct-27 11:37:57,912] context.embedded.FilterRegistrationBean - Mapping filter: 'characterEncodingFilter' to: [/*]
INFO : [oct-27 11:37:57,913] context.embedded.FilterRegistrationBean - Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
DBUrl: jdbc:sqlserver://bla
INFO : [oct-27 11:37:59,160] method.annotation.RequestMappingHandlerMapping - Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produ
ces=[],custom=[]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boo
t.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
INFO : [oct-27 11:37:59,161] method.annotation.RequestMappingHandlerMapping - Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produ
ces=[text/html],custom=[]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorControl
ler.errorHtml(javax.servlet.http.HttpServletRequest)
INFO : [oct-27 11:37:59,189] servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/webjars/**] onto handler of type [class org.springframew
ork.web.servlet.resource.ResourceHttpRequestHandler]
INFO : [oct-27 11:37:59,189] servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/**] onto handler of type [class org.springframework.web.
servlet.resource.ResourceHttpRequestHandler]
INFO : [oct-27 11:37:59,234] servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/**/favicon.ico] onto handler of type [class org.springfr
amework.web.servlet.resource.ResourceHttpRequestHandler]
INFO : [oct-27 11:37:59,399] export.annotation.AnnotationMBeanExporter - Registering beans for JMX exposure on startup
INFO : [oct-27 11:37:59,402] export.annotation.AnnotationMBeanExporter - Bean with name 'WorkDBDataSource' has been autodetected for JMX exposure
INFO : [oct-27 11:37:59,402] export.annotation.AnnotationMBeanExporter - Bean with name 'DWDataSource' has been autodetected for JMX exposure
INFO : [oct-27 11:37:59,408] export.annotation.AnnotationMBeanExporter - Located MBean 'WorkDBDataSource': registering with JMX server as MBean [
org.apache.commons.dbcp2:name=WorkDBDataSource,type=BasicDataSource]
INFO : [oct-27 11:37:59,411] export.annotation.AnnotationMBeanExporter - Located MBean 'DWDataSource': registering with JMX server as MBean [org.
apache.commons.dbcp2:name=DWDataSource,type=BasicDataSource]
INFO : [oct-27 11:37:59,446] coyote.http11.Http11NioProtocol - Initializing ProtocolHandler ["http-nio-8080"]
INFO : [oct-27 11:37:59,455] coyote.http11.Http11NioProtocol - Starting ProtocolHandler ["http-nio-8080"]
INFO : [oct-27 11:37:59,478] util.net.NioSelectorPool - Using a shared selector for servlet write/read
INFO : [oct-27 11:37:59,505] embedded.tomcat.TomcatEmbeddedServletContainer - Tomcat started on port(s): 8080 (http)
INFO : [oct-27 11:37:59,509] service.app.WsApplication - Started WsApplication in 6.421 seconds (JVM running for 7.159)
你启用组件扫描了吗？ IE。 :
@ComponentScan(basePackages = { "your.package.*" })
我不确定 @Value 是否会在没有这个的情况下被替换。
您可以使用环境变量在 application.properties 中获取 属性，例如
@Autowired
Environment env;
@Bean
@ConfigurationProperties(prefix="datasource.secondary")
public BasicDataSource DBDataSource() {
// Notice this line
System.out.println("DBUrl: " + env.getProperty("db_name.db.url"));
BasicDataSource DBDataSource = new BasicDataSource();
DWDataSource.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
DWDataSource.setUrl(DBUrl);
DWDataSource.setUsername("user");
DWDataSource.setPassword("pass");
DWDataSource.setMaxIdle(10);
DWDataSource.setMaxWaitMillis(10000);
DWDataSource.setValidationQuery("select 1");
DWDataSource.setTestOnBorrow(false);
DWDataSource.setTestWhileIdle(true);
DWDataSource.setDefaultAutoCommit(true);
return DBDataSource;
}
注意：application.properties 文件必须放在类路径中 (src/main/resources)。
同事们，这似乎是一个愚蠢的问题，但我无法从属性文件中读取 属性。
我有一个 Spring 配置 class:
@EnableWs
@Configuration
@PropertySource("classpath:appl.properties")
public class WebServiceConfig extends WsConfigurerAdapter {
/*Some beans*/
@Bean
public static PropertySourcesPlaceholderConfigurer propertyConfigInDev() {
return new PropertySourcesPlaceholderConfigurer();
}
@Value("${db_name.db.url}")
private String DBUrl;
@Bean
@ConfigurationProperties(prefix="datasource.secondary")
public BasicDataSource DBDataSource() {
System.out.println("DBUrl: " + DBUrl);
BasicDataSource DBDataSource = new BasicDataSource();
DWDataSource.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
DWDataSource.setUrl(DBUrl);
DWDataSource.setUsername("user");
DWDataSource.setPassword("pass");
DWDataSource.setMaxIdle(10);
DWDataSource.setMaxWaitMillis(10000);
DWDataSource.setValidationQuery("select 1");
DWDataSource.setTestOnBorrow(false);
DWDataSource.setTestWhileIdle(true);
DWDataSource.setDefaultAutoCommit(true);
return DBDataSource;
}
}
属性文件如下所示：
#bla bla bla
#bla bla bla
#bla bla bla
db_name.db.url=jdbc:sqlserver://bla
db_name.db.user=user
db_name.db.password=pass
当我 运行 编程并尝试调用数据库时，我收到下一个堆栈跟踪：
INFO : [oct-27 10:48:48,834] service.app.WsEndpoint - Error retrieving database metadata; nested exception is org.springframework.jdbc.support.Me taDataAccessException: Could not get Connection for extracting meta data; nested exception is org.springframework.jdbc.CannotGetJdbcConnectionExc eption: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot create JDBC driver of class 'com.microsoft.sqlserver.jdb c.SQLServerDriver' for connect URL 'null'
没有其他例外。
但是在属性文件中我有 db_name.db.url=db_name.db.url=jdbc:sqlserver://bla
为什么为空？
如果我改变了
@Value("${db_name.db.url}")
private String DBWUrl;
到
@Value("${db_name.db.url}")
private String DBUrl = "jdbc:sqlserver://bla";
在 Spring 配置 Java class 我工作正常。
更新
Spring 开始记录:
. ____ _ __ _ _
/\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.2.5.RELEASE)
INFO : [oct-27 11:37:53,555] service.app.WsApplication - Starting WsApplication on MyPC with PID 6688 (C:\Users\Maya\workspace\WS\ta
rget\classes started by Maya in C:\Users\Maya\workspace\WS)
INFO : [oct-27 11:37:53,635] context.embedded.AnnotationConfigEmbeddedWebApplicationContext - Refreshing org.springframework.boot.context.embedde
d.AnnotationConfigEmbeddedWebApplicationContext@10bbd20a: startup date [Tue Oct 27 11:37:53 MSK 2015]; root of context hierarchy
INFO : [oct-27 11:37:54,868] factory.support.DefaultListableBeanFactory - Overriding bean definition for bean 'beanNameViewResolver': replacing [
Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factor
yBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewRe
solver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAut
oConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; de
pendencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvc
AutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resour
ce [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
INFO : [oct-27 11:37:55,511] internal.util.Version - HV000001: Hibernate Validator 5.1.3.Final
INFO : [oct-27 11:37:55,693] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'webServiceConfig' of type [class
com.mayacomp.service.app.WebServiceConfig$$EnhancerBySpringCGLIB$06d7b6] is not eligible for getting processed by all BeanPostProcessors
(for example: not eligible for auto-proxying)
INFO : [oct-27 11:37:55,713] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.ws.config.ann
otation.DelegatingWsConfiguration' of type [class org.springframework.ws.config.annotation.DelegatingWsConfiguration$$EnhancerBySpringCGLIB$$f512
4549] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
INFO : [oct-27 11:37:55,785] addressing.server.AnnotationActionEndpointMapping - Supporting [WS-Addressing August 2004, WS-Addressing 1.0]
INFO : [oct-27 11:37:55,864] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.transaction.a
nnotation.ProxyTransactionManagementConfiguration' of type [class org.springframework.transaction.annotation.ProxyTransactionManagementConfigurat
ion$$EnhancerBySpringCGLIB$3342a] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying
)
INFO : [oct-27 11:37:55,888] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'transactionAttributeSource' of ty
pe [class org.springframework.transaction.annotation.AnnotationTransactionAttributeSource] is not eligible for getting processed by all BeanPostP
rocessors (for example: not eligible for auto-proxying)
INFO : [oct-27 11:37:55,903] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'transactionInterceptor' of type [
class org.springframework.transaction.interceptor.TransactionInterceptor] is not eligible for getting processed by all BeanPostProcessors (for ex
ample: not eligible for auto-proxying)
INFO : [oct-27 11:37:55,909] context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.transaction.c
onfig.internalTransactionAdvisor' of type [class org.springframework.transaction.interceptor.BeanFactoryTransactionAttributeSourceAdvisor] is not
eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
INFO : [oct-27 11:37:56,557] embedded.tomcat.TomcatEmbeddedServletContainer - Tomcat initialized with port(s): 8080 (http)
INFO : [oct-27 11:37:56,933] catalina.core.StandardService - Starting service Tomcat
INFO : [oct-27 11:37:56,935] catalina.core.StandardEngine - Starting Servlet Engine: Apache Tomcat/8.0.23
INFO : [oct-27 11:37:57,077] [Tomcat].[localhost].[/] - Initializing Spring embedded WebApplicationContext
INFO : [oct-27 11:37:57,078] web.context.ContextLoader - Root WebApplicationContext: initialization completed in 3447 ms
INFO : [oct-27 11:37:57,902] context.embedded.ServletRegistrationBean - Mapping servlet: 'messageDispatcherServlet' to [/services/*]
INFO : [oct-27 11:37:57,904] context.embedded.ServletRegistrationBean - Mapping servlet: 'dispatcherServlet' to [/]
INFO : [oct-27 11:37:57,912] context.embedded.FilterRegistrationBean - Mapping filter: 'characterEncodingFilter' to: [/*]
INFO : [oct-27 11:37:57,913] context.embedded.FilterRegistrationBean - Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
DBUrl: jdbc:sqlserver://bla
INFO : [oct-27 11:37:59,160] method.annotation.RequestMappingHandlerMapping - Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produ
ces=[],custom=[]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boo
t.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
INFO : [oct-27 11:37:59,161] method.annotation.RequestMappingHandlerMapping - Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produ
ces=[text/html],custom=[]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorControl
ler.errorHtml(javax.servlet.http.HttpServletRequest)
INFO : [oct-27 11:37:59,189] servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/webjars/**] onto handler of type [class org.springframew
ork.web.servlet.resource.ResourceHttpRequestHandler]
INFO : [oct-27 11:37:59,189] servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/**] onto handler of type [class org.springframework.web.
servlet.resource.ResourceHttpRequestHandler]
INFO : [oct-27 11:37:59,234] servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/**/favicon.ico] onto handler of type [class org.springfr
amework.web.servlet.resource.ResourceHttpRequestHandler]
INFO : [oct-27 11:37:59,399] export.annotation.AnnotationMBeanExporter - Registering beans for JMX exposure on startup
INFO : [oct-27 11:37:59,402] export.annotation.AnnotationMBeanExporter - Bean with name 'WorkDBDataSource' has been autodetected for JMX exposure
INFO : [oct-27 11:37:59,402] export.annotation.AnnotationMBeanExporter - Bean with name 'DWDataSource' has been autodetected for JMX exposure
INFO : [oct-27 11:37:59,408] export.annotation.AnnotationMBeanExporter - Located MBean 'WorkDBDataSource': registering with JMX server as MBean [
org.apache.commons.dbcp2:name=WorkDBDataSource,type=BasicDataSource]
INFO : [oct-27 11:37:59,411] export.annotation.AnnotationMBeanExporter - Located MBean 'DWDataSource': registering with JMX server as MBean [org.
apache.commons.dbcp2:name=DWDataSource,type=BasicDataSource]
INFO : [oct-27 11:37:59,446] coyote.http11.Http11NioProtocol - Initializing ProtocolHandler ["http-nio-8080"]
INFO : [oct-27 11:37:59,455] coyote.http11.Http11NioProtocol - Starting ProtocolHandler ["http-nio-8080"]
INFO : [oct-27 11:37:59,478] util.net.NioSelectorPool - Using a shared selector for servlet write/read
INFO : [oct-27 11:37:59,505] embedded.tomcat.TomcatEmbeddedServletContainer - Tomcat started on port(s): 8080 (http)
INFO : [oct-27 11:37:59,509] service.app.WsApplication - Started WsApplication in 6.421 seconds (JVM running for 7.159)
你启用组件扫描了吗？ IE。 :
@ComponentScan(basePackages = { "your.package.*" })
我不确定 @Value 是否会在没有这个的情况下被替换。
您可以使用环境变量在 application.properties 中获取 属性，例如
@Autowired
Environment env;
@Bean
@ConfigurationProperties(prefix="datasource.secondary")
public BasicDataSource DBDataSource() {
// Notice this line
System.out.println("DBUrl: " + env.getProperty("db_name.db.url"));
BasicDataSource DBDataSource = new BasicDataSource();
DWDataSource.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
DWDataSource.setUrl(DBUrl);
DWDataSource.setUsername("user");
DWDataSource.setPassword("pass");
DWDataSource.setMaxIdle(10);
DWDataSource.setMaxWaitMillis(10000);
DWDataSource.setValidationQuery("select 1");
DWDataSource.setTestOnBorrow(false);
DWDataSource.setTestWhileIdle(true);
DWDataSource.setDefaultAutoCommit(true);
return DBDataSource;
}
注意：application.properties 文件必须放在类路径中 (src/main/resources)。