Spring을 사용하여 프로그래밍 방식으로 속성 파일에 액세스 하시겠습니까?

Spring을 사용하여 프로그래밍 방식으로 속성 파일에 액세스 하시겠습니까?

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아래 코드를 사용하여 속성 파일의 속성으로 Spring Bean을 주입합니다.

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations" value="classpath:/my.properties"/>
</bean>

<bean id="blah" class="abc">
    <property name="path" value="${the.path}"/>
</bean>

프로그래밍 방식으로 속성에 액세스 할 수있는 방법이 있습니까? 의존성 주입없이 코드를 작성하려고합니다. 따라서 다음과 같은 코드를 갖고 싶습니다.

PropertyPlaceholderConfigurer props = new PropertyPlaceholderConfigurer();
props.load("classpath:/my.properties");
props.get("path");

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어떻게 PropertiesLoaderUtils ?

Resource resource = new ClassPathResource("/my.properties");
Properties props = PropertiesLoaderUtils.loadProperties(resource);

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코드에서 자리 표시 자 값에 액세스하기 만하면 @Value주석이 있습니다.

@Value("${settings.some.property}")
String someValue;

자리 표시 자에 액세스하려면 SPEL에서 다음 구문을 사용하십시오.

#('${settings.some.property}')

SPEL이 꺼진보기에 구성을 노출하려면 다음 트릭을 사용할 수 있습니다.

package com.my.app;

import java.util.Collection;
import java.util.Map;
import java.util.Set;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.stereotype.Component;

@Component
public class PropertyPlaceholderExposer implements Map<String, String>, BeanFactoryAware {  
    ConfigurableBeanFactory beanFactory; 

    @Override
    public void setBeanFactory(BeanFactory beanFactory) {
        this.beanFactory = (ConfigurableBeanFactory) beanFactory;
    }

    protected String resolveProperty(String name) {
        String rv = beanFactory.resolveEmbeddedValue("${" + name + "}");

        return rv;
    }

    @Override
    public String get(Object key) {
        return resolveProperty(key.toString());
    }

    @Override
    public boolean containsKey(Object key) {
        try {
            resolveProperty(key.toString());
            return true;
        }
        catch(Exception e) {
            return false;
        }
    }

    @Override public boolean isEmpty() { return false; }
    @Override public Set<String> keySet() { throw new UnsupportedOperationException(); }
    @Override public Set<java.util.Map.Entry<String, String>> entrySet() { throw new UnsupportedOperationException(); }
    @Override public Collection<String> values() { throw new UnsupportedOperationException(); }
    @Override public int size() { throw new UnsupportedOperationException(); }
    @Override public boolean containsValue(Object value) { throw new UnsupportedOperationException(); }
    @Override public void clear() { throw new UnsupportedOperationException(); }
    @Override public String put(String key, String value) { throw new UnsupportedOperationException(); }
    @Override public String remove(Object key) { throw new UnsupportedOperationException(); }
    @Override public void putAll(Map<? extends String, ? extends String> t) { throw new UnsupportedOperationException(); }
}

그런 다음 노출기를 사용하여 속성을 뷰에 노출하십시오.

<bean class="org.springframework.web.servlet.view.UrlBasedViewResolver" id="tilesViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.tiles2.TilesView"/>
    <property name="attributesMap">
        <map>
            <entry key="config">
                <bean class="com.my.app.PropertyPlaceholderExposer" />
            </entry>
        </map>
    </property>
</bean>

그런 다음, 다음과 같이 노출 된 속성을 사용하십시오.

${config['settings.some.property']}

이 솔루션은 context : property-placeholder 태그로 삽입 된 표준 자리 표시 자 구현에 의존 할 수 있다는 이점이 있습니다.

마지막으로, 모든 자리 표시 자 속성 및 해당 값을 캡처해야하는 경우 StringValueResolver를 통해 해당 값을 파이프하여 자리 표시자가 예상대로 속성 값 내에서 작동하도록해야합니다. 다음 코드는 그렇게 할 것입니다.

package com.my.app;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.util.StringValueResolver;

public class AppConfig extends PropertyPlaceholderConfigurer implements Map<String, String> {

    Map<String, String> props = new HashMap<String, String>();

    @Override
    protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props)
            throws BeansException {

        this.props.clear();
        for (Entry<Object, Object> e: props.entrySet())
            this.props.put(e.getKey().toString(), e.getValue().toString());

        super.processProperties(beanFactory, props);
    }

    @Override
    protected void doProcessProperties(ConfigurableListableBeanFactory beanFactoryToProcess,
            StringValueResolver valueResolver) {

        super.doProcessProperties(beanFactoryToProcess, valueResolver);

        for(Entry<String, String> e: props.entrySet())
            e.setValue(valueResolver.resolveStringValue(e.getValue()));
    }

    // Implement map interface to access stored properties
    @Override public Set<String> keySet() { return props.keySet(); }
    @Override public Set<java.util.Map.Entry<String, String>> entrySet() { return props.entrySet(); }
    @Override public Collection<String> values() { return props.values(); }
    @Override public int size() { return props.size(); }
    @Override public boolean isEmpty() { return props.isEmpty(); }
    @Override public boolean containsValue(Object value) { return props.containsValue(value); }
    @Override public boolean containsKey(Object key) { return props.containsKey(key); }
    @Override public String get(Object key) { return props.get(key); }
    @Override public void clear() { throw new UnsupportedOperationException(); }
    @Override public String put(String key, String value) { throw new UnsupportedOperationException(); }
    @Override public String remove(Object key) { throw new UnsupportedOperationException(); }
    @Override public void putAll(Map<? extends String, ? extends String> t) { throw new UnsupportedOperationException(); }
}

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CREDIT : 속성 파일을 다시 읽지 않고 Spring의 속성에 프로그래밍 방식으로 액세스

스프링이 이미로드 한 것과 동일한 속성을 다시로드하지 않고 스프링에서 프로그래밍 방식으로 속성에 액세스하는 훌륭한 구현을 발견했습니다. [또한 소스에서 속성 파일 위치를 하드 코딩 할 필요는 없습니다]

이러한 변경으로 코드가 더 깨끗하고 유지 관리가 용이 ​​해 보입니다.

개념은 매우 간단합니다. 스프링 기본 속성 자리 표시 자 (PropertyPlaceholderConfigurer)를 확장하고 로컬 변수에로드 된 속성을 캡처하십시오.

public class SpringPropertiesUtil extends PropertyPlaceholderConfigurer {

    private static Map<String, String> propertiesMap;
    // Default as in PropertyPlaceholderConfigurer
    private int springSystemPropertiesMode = SYSTEM_PROPERTIES_MODE_FALLBACK;

    @Override
    public void setSystemPropertiesMode(int systemPropertiesMode) {
        super.setSystemPropertiesMode(systemPropertiesMode);
        springSystemPropertiesMode = systemPropertiesMode;
    }

    @Override
    protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) throws BeansException {
        super.processProperties(beanFactory, props);

        propertiesMap = new HashMap<String, String>();
        for (Object key : props.keySet()) {
            String keyStr = key.toString();
            String valueStr = resolvePlaceholder(keyStr, props, springSystemPropertiesMode);
            propertiesMap.put(keyStr, valueStr);
        }
    }

    public static String getProperty(String name) {
        return propertiesMap.get(name).toString();
    }

}

사용 예

SpringPropertiesUtil.getProperty("myProperty")

스프링 구성 변경

<bean id="placeholderConfigMM" class="SpringPropertiesUtil">
    <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/>
    <property name="locations">
    <list>
        <value>classpath:myproperties.properties</value>
    </list>
    </property>
</bean>

이것이 당신이 가진 문제를 해결하는 데 도움이되기를 바랍니다.

---

나는 이것을했고 그것이 효과가 있었다.

Properties props = PropertiesLoaderUtils.loadAllProperties("my.properties");
PropertyPlaceholderConfigurer props2 = new PropertyPlaceholderConfigurer();
props2.setProperties(props);

작동합니다.

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스프링 유틸리티를 사용하거나 PropertiesFactoryBean을 통해 속성을로드 할 수도 있습니다.

<util:properties id="myProps" location="classpath:com/foo/myprops.properties"/>

또는:

<bean id="myProps" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
  <property name="location" value="classpath:com/foo/myprops.properties"/>
</bean>

그런 다음 응용 프로그램에서 다음을 사용하여 선택할 수 있습니다.

@Resource(name = "myProps")
private Properties myProps;

구성에서 다음 속성을 추가로 사용하십시오.

<context:property-placeholder properties-ref="myProps"/>

이것은 또한 문서에 있습니다 : http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#xsd-config-body-schemas-util-properties

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아래와 같은 클래스를 만듭니다

    package com.tmghealth.common.util;

    import java.util.Properties;

    import org.springframework.beans.BeansException;

    import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

    import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

    import org.springframework.context.annotation.Configuration;

    import org.springframework.context.annotation.PropertySource;

    import org.springframework.stereotype.Component;


    @Component
    @Configuration
    @PropertySource(value = { "classpath:/spring/server-urls.properties" })
    public class PropertiesReader extends PropertyPlaceholderConfigurer {

        @Override
        protected void processProperties(
                ConfigurableListableBeanFactory beanFactory, Properties props)
                throws BeansException {
            super.processProperties(beanFactory, props);

        }

    }

그런 다음 속성 사용에 액세스하려는 곳

    @Autowired
        private Environment environment;
    and getters and setters then access using 

    environment.getProperty(envName
                    + ".letter.fdi.letterdetails.restServiceUrl");

-접근 자 클래스에서 getter 및 setter 작성

    public Environment getEnvironment() {
            return environment;
        }`enter code here`

        public void setEnvironment(Environment environment) {
            this.environment = environment;
        }

---

최신 버전의 Spring은 PropertyPlaceholderConfigurer를 사용하지 않으며 이제 PropertySourcesPlaceholderConfigurer라는 또 다른 악몽 같은 구성을 사용합니다. 코드에서 해결 된 속성을 얻으려고 노력하고 스프링 팀이 오래 전에이 작업을 수행 할 수있는 방법을 원한다면이 게시물에 투표하십시오! ... 이것이 새로운 방식으로 수행되기 때문에 :

서브 클래스 PropertySourcesPlaceholderConfigurer :

public class SpringPropertyExposer extends PropertySourcesPlaceholderConfigurer {

    private ConfigurableListableBeanFactory factory;

    /**
     * Save off the bean factory so we can use it later to resolve properties
     */
    @Override
    protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess,
            final ConfigurablePropertyResolver propertyResolver) throws BeansException {
        super.processProperties(beanFactoryToProcess, propertyResolver);

        if (beanFactoryToProcess.hasEmbeddedValueResolver()) {
            logger.debug("Value resolver exists.");
            factory = beanFactoryToProcess;
        }
        else {
            logger.error("No existing embedded value resolver.");
        }
    }

    public String getProperty(String name) {
        Object propertyValue = factory.resolveEmbeddedValue(this.placeholderPrefix + name + this.placeholderSuffix);
        return propertyValue.toString();
    }
}

이를 사용하려면 @Configuration에서 서브 클래스를 사용하고 나중에 사용할 수 있도록 참조를 저장하십시오.

@Configuration
@ComponentScan
public class PropertiesConfig {

    public static SpringPropertyExposer commonEnvConfig;

    @Bean(name="commonConfig")
    public static PropertySourcesPlaceholderConfigurer commonConfig() throws IOException {
        commonEnvConfig = new SpringPropertyExposer(); //This is a subclass of the return type.
        PropertiesFactoryBean commonConfig = new PropertiesFactoryBean();
        commonConfig.setLocation(new ClassPathResource("META-INF/spring/config.properties"));
        try {
            commonConfig.afterPropertiesSet();
        }
        catch (IOException e) {
            e.printStackTrace();
            throw e;
        }
        commonEnvConfig.setProperties(commonConfig.getObject());
        return commonEnvConfig;
    }
}

용법:

Object value = PropertiesConfig.commonEnvConfig.getProperty("key.subkey");

---

여기 또 다른 샘플이 있습니다.

XmlBeanFactory factory = new XmlBeanFactory(new FileSystemResource("beans.xml"));
PropertyPlaceholderConfigurer cfg = new PropertyPlaceholderConfigurer();
cfg.setLocation(new FileSystemResource("jdbc.properties"));
cfg.postProcessBeanFactory(factory);

---

이것은 나를 도와줍니다 :

ApplicationContextUtils.getApplicationContext().getEnvironment()

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중첩 된 속성이 해결됩니다.

public class Environment extends PropertyPlaceholderConfigurer {

/**
 * Map that hold all the properties.
 */
private Map<String, String> propertiesMap; 

/**
 * Iterate through all the Property keys and build a Map, resolve all the nested values before building the map.
 */
@Override
protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) throws BeansException {
    super.processProperties(beanFactory, props);

    propertiesMap = new HashMap<String, String>();
    for (Object key : props.keySet()) {
        String keyStr = key.toString();
        String valueStr = beanFactory.resolveEmbeddedValue(placeholderPrefix + keyStr.trim() + DEFAULT_PLACEHOLDER_SUFFIX);
        propertiesMap.put(keyStr, valueStr);
    }
} 

/**
 * This method gets the String value for a given String key for the property files.
 * 
 * @param name - Key for which the value needs to be retrieved.
 * @return Value
 */
public String getProperty(String name) {
    return propertiesMap.get(name).toString();
}

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이 게시물은 속성에 액세스하는 방법도 explatis입니다 : http://maciej-miklas.blogspot.de/2013/07/spring-31-programmatic-access-to.html

이러한 스프링 빈을 통해 스프링 속성 자리 표시자가로드 한 속성에 액세스 할 수 있습니다.

@Named
public class PropertiesAccessor {

    private final AbstractBeanFactory beanFactory;

    private final Map<String,String> cache = new ConcurrentHashMap<>();

    @Inject
    protected PropertiesAccessor(AbstractBeanFactory beanFactory) {
        this.beanFactory = beanFactory;
    }

    public  String getProperty(String key) {
        if(cache.containsKey(key)){
            return cache.get(key);
        }

        String foundProp = null;
        try {
            foundProp = beanFactory.resolveEmbeddedValue("${" + key.trim() + "}");
            cache.put(key,foundProp);
        } catch (IllegalArgumentException ex) {
           // ok - property was not found
        }

        return foundProp;
    }
}

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You can get your properties through Environment class. As documentation stands:

Properties play an important role in almost all applications, and may originate from a variety of sources: properties files, JVM system properties, system environment variables, JNDI, servlet context parameters, ad-hoc Properties objects, Maps, and so on. The role of the environment object with relation to properties is to provide the user with a convenient service interface for configuring property sources and resolving properties from them.

Having Environment as a env variable, simply call:

env.resolvePlaceholders("${your-property:default-value}")

You can get your 'raw' properties through:

env.getProperty("your-property")

It will search through all properties source that spring has registered.

You can either obtain Environment through:

• inject ApplicationContext by implementing ApplicationContextAware and then call getEnvironment() on context
• implement EnvironmentAware.

It's obtain through implementation of a class because properties are resolved on early stage of application startup, as they may be required for bean construction.

Read more on documentation: spring Environment documentation

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create .properties file in classpath of your project and add path configuration in xml`<context:property-placeholder location="classpath*:/*.properties" />`

in servlet-context.xml after that u can directly use your file everywhere

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Please use the below code in your spring configuration file to load the file from class path of your application

 <context:property-placeholder
    ignore-unresolvable="true" ignore-resource-not-found="false" location="classpath:property-file-name" />

---

This is the finest way I got it to work:

package your.package;

import java.io.IOException;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;

public class ApplicationProperties {

    private Properties properties;

    public ApplicationProperties() {
        // application.properties located at src/main/resource
        Resource resource = new ClassPathResource("/application.properties");
        try {
            this.properties = PropertiesLoaderUtils.loadProperties(resource);
        } catch (IOException ex) {
            Logger.getLogger(ApplicationProperties.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public String getProperty(String propertyName) {
        return this.properties.getProperty(propertyName);
    }
}

참고URL : https://stackoverflow.com/questions/1771166/access-properties-file-programmatically-with-spring