如何从属性文件读取值？

Question

我正在使用弹簧。我需要从属性文件读取值。这是内部属性文件而不是外部属性文件。属性文件可以如下。

some.properties ---file name. values are below. 

abc = abc 
def = dsd 
ghi = weds 
jil = sdd 

我需要从传统方式读取属性文件中的值。如何实现它？ Spring 3.0有最新的方法吗？

Answer 1

配置PropertyPlaceholder在上下文：

<context:property-placeholder location="classpath*:my.properties"/> 

然后，你指的是性能在豆类：

@Component 
class MyClass { 
    @Value("${my.property.name}") 
    private String[] myValues; 
} 

编辑：更新的代码复式逗号分隔值解析属性：

my.property.name=aaa,bbb,ccc 

如果这不起作用，您可以定义一个bean的属性，注入和手动处理它：

<bean id="myProperties" 
     class="org.springframework.beans.factory.config.PropertiesFactoryBean"> 
    <property name="locations"> 
    <list> 
     <value>classpath*:my.properties</value> 
    </list> 
    </property> 
</bean> 

和bean：

@Component 
class MyClass { 
    @Resource(name="myProperties") 
    private Properties myProperties; 

    @PostConstruct 
    public void init() { 
    // do whatever you need with properties 
    } 
} 

Answer 2

您需要在应用程序上下文中放置PropertyPlaceholderConfigurer bean并设置其位置属性。

看详情点击这里：http://www.zparacha.com/how-to-read-properties-file-in-spring/

您可能需要修改您的属性文件有点为这件事的工作。

希望它有帮助。

Answer 3

在配置类

@Configuration 
@PropertySource("classpath:/com/myco/app.properties") 
public class AppConfig { 
    @Autowired 
    Environment env; 

    @Bean 
    public TestBean testBean() { 
     TestBean testBean = new TestBean(); 
     testBean.setName(env.getProperty("testbean.name")); 
     return testBean; 
    } 
} 

Answer 4

这是一个额外的回答也是有很大的帮助，我听不懂如何加工：http://www.javacodegeeks.com/2013/07/spring-bean-and-propertyplaceholderconfigurer.html

种任何的BeanFactoryPostProcessor豆已经到了静态声明，修改

@Configuration 
@PropertySource("classpath:root/test.props") 
public class SampleConfig { 
@Value("${test.prop}") 
private String attr; 
@Bean 
public SampleService sampleService() { 
    return new SampleService(attr); 
} 

@Bean 
public static PropertySourcesPlaceholderConfigurer placeHolderConfigurer() { 
    return new PropertySourcesPlaceholderConfigurer(); 
} 
} 

Answer 5

[project structure]: http://i.stack.imgur.com/RAGX3.jpg 
------------------------------- 
    package beans; 

     import java.util.Properties; 
     import java.util.Set; 

     public class PropertiesBeans { 

      private Properties properties; 

      public void setProperties(Properties properties) { 
       this.properties = properties; 
      } 

      public void getProperty(){ 
       Set keys = properties.keySet(); 
       for (Object key : keys) { 
        System.out.println(key+" : "+properties.getProperty(key.toString())); 
       } 
      } 

     } 
    ---------------------------- 

     package beans; 

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

     public class Test { 

      public static void main(String[] args) { 
       // TODO Auto-generated method stub 
       ApplicationContext ap = new ClassPathXmlApplicationContext("resource/spring.xml"); 
       PropertiesBeans p = (PropertiesBeans)ap.getBean("p"); 
       p.getProperty(); 
      } 

     } 
    ---------------------------- 

- driver.properties 

    Driver = com.mysql.jdbc.Driver 
    url = jdbc:mysql://localhost:3306/test 
    username = root 
    password = root 
    ---------------------------- 



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

      <bean id="p" class="beans.PropertiesBeans"> 
       <property name="properties"> 
        <util:properties location="classpath:resource/driver.properties"/> 
       </property> 
      </bean> 

     </beans> 

Answer 6

有多种方法来实现相同的，下面是弹簧

一些常用方法
1. 使用PropertyPlaceholderConfigurer
2. 使用Pro pertySource
3. 使用ResourceBundleMessageSource会

4. 使用PropertiesFactoryBean

   等等........................

假设ds.type是在你的属性文件的关键。

---

使用PropertyPlaceholderConfigurer

注册PropertyPlaceholderConfigurer bean-

<context:property-placeholder location="classpath:path/filename.properties"/> 

或

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

或

@Configuration 
public class SampleConfig { 
@Bean 
public static PropertySourcesPlaceholderConfigurer placeHolderConfigurer() { 
    return new PropertySourcesPlaceholderConfigurer(); 
    //set locations as well. 
} 
} 

注册PropertySourcesPlaceholderConfigurer后，现在您可以访问值 -

@Value("${ds.type}")private String attr; 

---

使用PropertySource

在最新版本的春天无需注册PropertyPlaceHolderConfigurer与@PropertySource，我找到了一个好link了解版本comaptibility-

@PropertySource("classpath:path/filename.properties") 
@Component 
public class BeanTester { 
    @Autowired Environment environment; 
    public void execute(){ 
     String attr = this.environment.getProperty("ds.type"); 
    } 
} 

---

使用ResourceBundleMessageSource

注册Bean-

<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"> 
    <property name="basenames"> 
    <list> 
     <value>classpath:path/filename.properties</value> 
    </list> 
    </property> 
</bean> 

访问价值 -

((ApplicationContext)context).getMessage("ds.type", null, null); 

或

@Component 
public class BeanTester { 
    @Autowired MessageSource messageSource; 
    public void execute(){ 
     String attr = this.messageSource.getMessage("ds.type", null, null); 
    } 
} 

---

使用PropertiesFactoryBean

注册Bean-

<bean id="properties" 
     class="org.springframework.beans.factory.config.PropertiesFactoryBean"> 
    <property name="locations"> 
    <list> 
     <value>classpath:path/filename.properties</value> 
    </list> 
    </property> 
</bean> 

线性能的情况下进入你接收机类

@Component 
public class BeanTester { 
    @Autowired Properties properties; 
    public void execute(){ 
     String attr = properties.getProperty("ds.type"); 
    } 
}