同事们，我是Spring 4的新人。 我有一个调用程序的类：
public class ProductDAOImpl implements ProductDAO {
public Product getProductUsingProc(int PassID, int Amount) {
SqlParameterSource sqlParameterSource = new MapSqlParameterSource().addValue("PassID", PassID).addValue("Amount", Amount);
WebServiceConfig wsc = new WebServiceConfig();
DataSource dataSource = wsc.DataSource("DB1");
SimpleJdbcCall simpleJdbcCall = new SimpleJdbcCall(dataSource).withProcedureName("PRODUCT_CREATE");
Map<String, Object> result = simpleJdbcCall.execute(sqlParameterSource);
Product product = new Product();
product.setPassID(PassID);
product.setAmount(Amount);
product.setReturnValue( (int) result.get("ReturnValue") );
product.setProductID((int) result.get("ProductID"));
return product;
}
我需要使用带有不同输入参数的dataSource。
WebServiceConfig（wsc）中的我的bean看起来像：
@Bean
public BasicDataSource DataSource(String source) {
/*some code using input parameter*/
BasicDataSource dataSource = new BasicDataSource();
dataSource.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
dataSource.setUrl("jdbc:....");
dataSource.setUsername("user");
dataSource.setPassword("pass");
dataSource.setMaxIdle(10);
dataSource.setMaxWaitMillis(10000);
dataSource.setValidationQuery("select 1");
dataSource.setTestOnBorrow(false);
dataSource.setTestWhileIdle(true);
dataSource.setDefaultAutoCommit(true);
return dataSource;
}
但是当运行程序时，我会收到下一个堆栈跟踪：
Error starting ApplicationContext. To display the auto-configuration report enable debug logging (start with --debug)
ERROR: [oct-26 16:46:44,337] springframework.boot.SpringApplication - Application startup failed org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'DataSource' defined in class path resource [com/mayacomp/service/app/WebServiceConfig.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [java.lang. String]: : No qualifying bean of type [java.lang.String] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.String] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Depende ncy annotations: {}
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:464)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBean Factory.java:1119)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.jav a:1014)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
at com.mayacomp.service.app.WsApplication.main(WsApplication.java:12) Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.String] found for dependency: e xpected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.jav a:1301)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741)
... 18 more Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'DataSource' defined i n class path resource [com/mayacomp/service/app/WebServiceConfig.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [java.lang.String]: : No qualifying bean of type [java.lang.String] found for dependency: expected at least 1 bean which qualifie s as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefiniti onException: No qualifying bean of type [java.lang.String] found for dependency: expected at least 1 bean which qualifies as autowire candidate f or this dependency. Dependency annotations: {}
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:464)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBean Factory.java:1119)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.jav a:1014)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
at com.mayacomp.service.app.WsApplication.main(WsApplication.java:12) Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.String] found for dependency: e xpected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.jav a:1301)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741)
... 18 more
当我使用bean时没有＆＃34;字符串来源＆＃34;它工作正常吗？
更新
我通过为每个数据源使用单独的bean来解决问题：
@Bean
@Primary
@ConfigurationProperties(prefix="datasource.primary")
public BasicDataSource DataSource() {
BasicDataSource dataSource = new BasicDataSource();
dataSource.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
dataSource.setUrl("jdbc:sqlserver://");
dataSource.setUsername("user");
dataSource.setPassword("pass");
dataSource.setMaxIdle(10);
dataSource.setMaxWaitMillis(10000);
dataSource.setValidationQuery("select 1");
dataSource.setTestOnBorrow(false);
dataSource.setTestWhileIdle(true);
dataSource.setDefaultAutoCommit(true);
return dataSource;
}
@Bean
@ConfigurationProperties(prefix="datasource.secondary")
public BasicDataSource DataSource1() {
BasicDataSource DataSource1 = new BasicDataSource();
DataSource1.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
DataSource1.setUrl("jdbc:sqlserver://");
DataSource1.setUsername("user");
DataSource1.setPassword("pass");
DataSource1.setMaxIdle(10);
DataSource1.setMaxWaitMillis(10000);
DataSource1.setValidationQuery("select 1");
DataSource1.setTestOnBorrow(false);
DataSource1.setTestWhileIdle(true);
DataSource1.setDefaultAutoCommit(true);
return DataSource1;
}
@Bean
@ConfigurationProperties(prefix="datasource.secondary")
public BasicDataSource DataSource2() {
BasicDataSource DataSource2 = new BasicDataSource();
DataSource2.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
DataSource2.setUrl("jdbc:sqlserver://");
DataSource2.setUsername("user");
DataSource2.setPassword("pass");
DataSource2.setMaxIdle(10);
DataSource2.setMaxWaitMillis(10000);
DataSource2.setValidationQuery("select 1");
DataSource2.setTestOnBorrow(false);
DataSource2.setTestWhileIdle(true);
DataSource2.setDefaultAutoCommit(true);
return DataSource2;
}
答案 0 :(得分：3)
当您在使用@Bean注释的方法中传递参数时，每个参数都由spring容器解析，在您的特定情况下，spring无法找到类型为string的bean来满足依赖性，因为您没有设置任何（和你不应该！：））。
如果你想注入一些参数，spring会为你提供@Value注释（这是spring有助于注入属性btw的几种不同方式之一），例如：
_applicationSettings.Value
您需要在资源文件夹中的application.properties文件中定义属性your.property.name，如下所示
your.property.name =我的价值
n.b。
你可以在你的上下文配置文件中使用@PropertySource来从你喜欢的任何地方导入属性http://docs.spring.io/spring-framework/docs/4.0.x/javadoc-api/org/springframework/context/annotation/PropertySource.html（我已经被弹簧启动所破坏了，如果spring自动加载属性，我就忘记了：D）
答案 1 :(得分：0)
您可以在配置中使用@PropertySource（＆＃34; yourFile.properties＆＃34;）并通过以下环境获取属性：
@Configuration
@PropertySource("yourFile.properties")
public class YourConfiguration{
@Autowired
Environment env
@Bean
public BasicDataSource DataSource() {
String source = env.getProperty("source");
//your code below
}
}
希望这个帮助