将 java.util.Properties 作为参数传入Spring [初级]

本文介绍如何在Spring框架中通过静态工厂方法将Java.util.Properties类型的Bean注入到目标类中,并展示了具体的实现步骤与配置文件。

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在一个应用中,需要将 java.util.Properties 作为参数传入 一个类中,并读出其中的一个参数

 

package cn.com.test.spring.properties;

import java.util.Properties;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class PropertyTest {
	
	private Properties pro;

	public void setPro(Properties pro) {
		this.pro = pro;
	}

	public Properties getPro() {
		return pro;
	}
	
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("context_test_property.xml");
		PropertyTest test = (PropertyTest)context.getBean("PropertyTest");
		System.out.println(test.getPro().get("testString"));
	}
}

 

如何将java.util.Properties以一个Bean的形式传入该类呢?可以使用Spring的静态工厂方法:

首先定义一个类实现一个返回 Properties的静态方法:

 

package cn.com.test.spring.properties;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;

public class Configuration {
	private static Properties pro = null;

	public static Properties getProperties(String propertyFile)
			throws FileNotFoundException, IOException {
		if (pro == null) {
			pro = new Properties();
			pro.load(new FileInputStream(propertyFile));
		}
		return pro;
	}
}

 

 然后在配置文件中注册这个静态工厂方法即可

 

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

	<bean id="PropertyTest" class="cn.com.test.spring.properties.PropertyTest">
		<property name="pro" ref="prop" />
	</bean>

	<bean id="prop" class="cn.com.test.spring.properties.Configuration"
		factory-method="getProperties">
		<constructor-arg
			value="E:\Project\Java\Spring\springstudy\src\test.properties" />
	</bean>
</beans>

 

如果在src的根路径下有文件test.propertie,其内容是:

testString=this is a test string for the test of a property file

 

则运行程序将打印出这句话

 

java.lang.IllegalStateException: Failed to load ApplicationContext for [WebMergedContextConfiguration@2fac80a8 testClass = Teat, locations = [], classes = [com.xinshi.cloud_steward.start.StartApplication], contextInitializerClasses = [], activeProfiles = [], propertySourceDescriptors = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true", "server.port=0"], contextCustomizers = [[ImportsContextCustomizer@6987a133 key = [org.springframework.boot.test.autoconfigure.web.servlet.MockMvcWebDriverAutoConfiguration, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcAutoConfiguration, org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration, org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration, org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration, org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration, org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcSecurityConfiguration, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcWebClientAutoConfiguration, org.springframework.boot.test.autoconfigure.web.reactive.WebTestClientAutoConfiguration]], org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@6d025197, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@1c481ff2, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@19835e64, org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@1f, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@4b3fa0b3, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizer@6138e79a, org.springframework.boot.test.context.SpringBootTestAnnotation@310d5045], resourceBasePath = "src/main/webapp", contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null] at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:180) at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:130) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:141) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:97) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:260) at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:163) at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) at java.base/java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:310) at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:735) at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734) at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) at java.base/java.util.Optional.orElseGet(Optional.java:364) at java.base/java.util.ArrayList.forEach(ArrayList.java:1596) at java.base/java.util.ArrayList.forEach(ArrayList.java:1596) Caused by: java.lang.IllegalArgumentException: Invalid value type for attribute 'factoryBeanObjectType': java.lang.String at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getTypeForFactoryBeanFromAttributes(FactoryBeanRegistrySupport.java:86) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryBean(AbstractAutowireCapableBeanFactory.java:836) at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:620) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:575) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:534) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:138) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:789) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:606) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:464) at org.springframework.boot.SpringApplication.run(SpringApplication.java:334) at org.springframework.boot.test.context.SpringBootContextLoader.lambda$loadContext$3(SpringBootContextLoader.java:137) at org.springframework.util.function.ThrowingSupplier.get(ThrowingSupplier.java:58) at org.springframework.util.function.ThrowingSupplier.get(ThrowingSupplier.java:46) at org.springframework.boot.SpringApplication.withHook(SpringApplication.java:1458) at org.springframework.boot.test.context.SpringBootContextLoader$ContextLoaderHook.run(SpringBootContextLoader.java:552) at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:137) at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:108) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:225) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:152) ... 17 more
最新发布
07-06
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