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[英]How to import spring-config.xml of one project into spring-config.xml of another project?
[英]Beans for third party library in spring-config.xml
我有一堂課,看起來像下面
@Component
public class BillDAO {
private DynamoDBMapper dynamoDBMapper;
public void create(BillDO billDO) {
AmazonDynamoDBClientBuilder builder = AmazonDynamoDBClientBuilder.standard().withRegion(Regions.AP_SOUTH_1);
DynamoDBMapper dynamoDBMapper = new DynamoDBMapper(builder.build());
dynamoDBMapper.save(billDO);
}
}
基本上,我不想每次調用方法create時都構造dynamoDBMapper和構建器實例。 寧願將它們作為豆類注入。 該怎么辦?
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.tarkshala" />
</beans>
我確實發現了幾個使用bean和工廠方法的Constructor-arg的示例。 不知道如何在這里使用它。
您應該能夠使用@Configuration注釋執行此操作。 這是@Configuration實現的代碼示例,用於將AmazonDynamoDBClientBuilder和DynamoDBMapper創建為Spring bean。
package com.tarkshala;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class ConfigurationAnnotationExample {
@Bean
public AmazonDynamoDBClientBuilder getAmazonDynamoDBClientBuilder() {
return AmazonDynamoDBClientBuilder.standard().withRegion(Regions.AP_SOUTH_1);
}
@Bean
public DynamoDBMapper getDynamoDBMapper(final AmazonDynamoDBClientBuilder builder) {
return new DynamoDBMapper(builder.build());
}
}
這是修改后的BillDAO,以使用注入的DynamoDBMapper。
package com.tarkshala;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class BillDAO {
private DynamoDBMapper dynamoDBMapper;
@Autowired
public BillDAO(final DynamoDBMapper dynamoDBMapper) {
this.dynamoDBMapper = dynamoDBMapper;
}
public void create(BillDO billDO) {
dynamoDBMapper.save(billDO);
}
}
由於您已經在應用程序上下文xml中添加了<context:component-scan base-package="com.tarkshala"/>
,因此從ConfigurationAnnotationExample類創建bean不需要任何其他操作。
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