使用Spring属性占位符从文件.properties读取列表

util:properties element

<bean name="XXX" class="XX.YY.Z">
  <property name="urlList">
    <util:properties location="${path.to.properties.file}"/>
  </property>
</bean>

更新 我误解了这个问题;您只想返回键以特定字符串开头的属性。实现这一点的最简单方法是在bean的setter方法中执行。您必须将字符串作为单独的属性传递给bean。延长上述声明:

<bean name="XXX" class="XX.YY.Z" init-method="init">
  <property name="propertiesHolder">
     <!-- not sure if location has to be customizable here; set it directly if needed -->
    <util:properties location="${path.to.properties.file}"/>
  </property>
  <property name="propertyFilter" value="${property.filter}" />
</bean>

在你的 XX.YY.Z

private String propertyFilter;
private Properties propertiesHolder;
private List<String> urlList;

// add setter methods for propertyFilter / propertiesHolder

// initialization callback
public void init() {
  urlList = new ArrayList<String>();
  for (Enumeration en = this.propertiesHolder.keys(); en.hasMoreElements(); ) {
    String key = (String) en.nextElement();
    if (key.startsWith(this.propertyFilter + ".") { // or whatever condition you want to check
      this.urlList.add(this.propertiesHolder.getProperty(key));
    }
  } // for
}

如果需要在许多不同的地方执行此操作,可以将上述功能打包到FactoryBean中。

class Z {
    private List<String> urlList;
    // add setters and getters
}

你的bean定义

<bean name="XXX" class="XX.YY.Z">
      <property name="urlList" value="#{'${prop.list}'.split(',')}"/>
</bean>

prop.list=a,b,c,d

<bean id="cpaContextSource" class="org.springframework.ldap.core.support.LdapContextSource">
    <property name="urls">
    <bean class="org.springframework.util.CollectionUtils" factory-method="arrayToList">
        <constructor-arg type="java.lang.Object">
            <bean class="org.springframework.util.StringUtils" factory-method="tokenizeToStringArray">
                <constructor-arg type="java.lang.String" value="${myList}"/>
                <constructor-arg type="java.lang.String" value=" "/>
            </bean>
        </constructor-arg>
    </bean>
    </property>

myList=http://aaa http://bbb http://ccc

我在这里看到的唯一方法是实现接口 MessageSourceAware

class MyMessageSourceAwareClass implemets MessageSourceAware{
    public static MessageSource messageSource = null;

    public void setMessageSource(MessageSource _messageSource) {
        messageSource = _messageSource;
    }

    public static String getMessage( String code){
        return messageSource.getMessage(code, null, null );
    }

}

---属性文件---

prop.list=foo;bar;one more

按如下方式填充您的列表

String strlist = MyMessageSourceAwareClass.getMessage ( "prop.list" );

if ( StringUtilities.isNotEmptyString ( strlist ) ){
   String[] arrStr = strList.split(";");
   myBean.setList ( Arrays.asList ( arrStr ) );
}

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

要这样使用它,请注意端口是在myprops.properties中定义的

<bean id="mybean" class="com.mycompany.Class" init-method="start">
    <property name="portNumber" value="${port}"/>
</bean>

有几种方法,其中之一如下。

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