Question

我正在创建具有两个子模块的Maven多模块。一个是具有数据库存储库的简单DAO层，另一个是Spring Boot应用程序，它是命令行应用程序。我正在使用mongodb和spring-data-monodb作为数据库。当我使用xml config作为配置mongodb时

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mongo="http://www.springframework.org/schema/data/mongo"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo.xsd">

    <bean id="mongoTemplate" 
    class="org.springframework.data.mongodb.core.MongoTemplate">
        <constructor-arg ref="mongoClient" />
        <constructor-arg name="databaseName" value="test" />
    </bean>

    <mongo:mongo-client id="mongoClient" 
    credentials="username:password@source" replica-set="server1uri:27017,server2uri:27017,server3uri:27017" >
        <mongo:client-options connections-per-host="50" threads-allowed-to-block-for-connection-multiplier="5000" ssl="true" />
    </mongo:mongo-client>

</beans>

工作正常。我已经在dao模块中定义了这个文件，并在SpringBootApplication上使用@ImportResource在spring boot模块中使用了它，并且工作正常。

现在我需要在运行spring boot jar（java -jar app.jar /path/to/bean.xml）时提供此文件作为命令行参数。我做了什么，我在SpringBootApplication中实现了CommandLineRunner，并使用XmlBeanDefinitionReader在xml文件上方加载的那个方法中实现了。

    @SpringBootApplication
    public class Application implements CommandLineRunner {

    @Autowired
    private GenericApplicationContext applicationContext;

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

    @Override
    public void run(String... args) throws Exception {
        if (args.length == 0 ) {
            System.out.println("Provide path for mongodb connection file");
            return;
        }

        XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(applicationContext);

        Resource beanFile = new FileSystemResource(args[0]);
        xmlBeanDefinitionReader.loadBeanDefinitions(beanFile);

        // Rest of logic.
    }
}

然后，它不能正确投射mongo凭据。它抛出以下错误。

Caused by: java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'com.mongodb.MongoCredential' for property 'credentials[0]': no matching editors or conversion strategy found

以某种方式无法转换凭据。我正在使用Spring Boot 2.0.2.RELEASE

Answer 1

CommandLineRunner为时已晚，无法在春季注册Bean定义，因此我们需要实现 BeanFactoryPostProcessor 来加载Bean定义xml，我没有完全测试以下代码，您可以做到给我反馈

CREATE EVENT SESSION [<MachineName>] ON SERVER 
ADD EVENT sqlserver.rpc_completed(
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_name,sqlserver.sql_text)
    WHERE ([sqlserver].[client_hostname]=N'<MachineName>')),
ADD EVENT sqlserver.sql_batch_completed(
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_name,sqlserver.sql_text)
    WHERE ([sqlserver].[client_hostname]=N'<MachineName>')),
ADD EVENT sqlserver.sql_statement_completed(
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_name,sqlserver.sql_text)
    WHERE ([sqlserver].[client_hostname]=N'<MachineName>'))
ADD TARGET package0.event_file(SET filename=N'C:\ExtEvents\<MachineName>.xel',max_file_size=(5120))
WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=OFF)

Answer 2

您应该实现 BeanDefinitionRegistryPostProcessor ，这样就可以尽早注册Bean

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

@SpringBootApplication
public class Application implements BeanDefinitionRegistryPostProcessor {

    private static String xmlFile;
    public static void main(String[] args) throws Exception {
        if (args.length == 0 ) {
            System.out.println("Provide path for mongodb connection file");
            return;
        }
        xmlFile = args[0];
        SpringApplication.run(MongoApplication.class, args);
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
    }

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
            XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(registry);
            Resource beanFile = new FileSystemResource(Application.xmlFile);
            xmlBeanDefinitionReader.loadBeanDefinitions(beanFile);
    }
}

Spring Boot XmlBeanDefinitionReader无法正常工作

2 个答案: