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Spring源码学习-PropertyPlaceholderHelper

时间:2016-08-19 18:49:44      阅读:151      评论:0      收藏:0      [点我收藏+]

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转载:http://my.oschina.net/ydsakyclguozi/blog/465526

1. CustomPropertyConfigurer.java

package propertyconfig;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.Map.Entry;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.util.PropertyPlaceholderHelper;

public class CustomPropertyConfigurer extends PropertyPlaceholderConfigurer{
  private static Map<String,String> properties = new HashMap<String,String>();
  protected void processProperties(
    ConfigurableListableBeanFactory beanFactoryToProcess,
    Properties props) throws BeansException {
    // cache the properties
    PropertyPlaceholderHelper helper = new PropertyPlaceholderHelper(
    DEFAULT_PLACEHOLDER_PREFIX, DEFAULT_PLACEHOLDER_SUFFIX, DEFAULT_VALUE_SEPARATOR, false);
    for(Entry<Object,Object> entry:props.entrySet()){
      String stringKey = String.valueOf(entry.getKey());
      String stringValue = String.valueOf(entry.getValue());

      //用属性文件键值属性props替换字符串stringValue
      stringValue = helper.replacePlaceholders(stringValue, props);
      properties.put(stringKey, stringValue);
    }
    super.processProperties(beanFactoryToProcess, props);
  }

  public static Map<String, String> getProperties() {
    return properties;
  }

  public static String getProperty(String key){
    return properties.get(key);
  }
}
2. applicationContext.xml

<?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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"
default-lazy-init="true" default-autowire="byName" default-init-method="" default-destroy-method="">

<bean id="propertyConfigurer" class="propertyconfig.CustomPropertyConfigurer">
  <property name="locations">
    <list>
      <value>classpath:propertyconfig/project.properties</value>
    </list>
  </property>
</bean>
</beans>


3. project.properties

site=iteye
blog=antlove
url=${site}/${blog}
4. Main.java测试类

package propertyconfig;
import java.util.Map;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
  public static void main(String[] args) {
    new ClassPathXmlApplicationContext("propertyconfig/applicationContext.xml");

    Map<String,String> properties = CustomPropertyConfigurer.getProperties();

    System.out.println(properties);
  }
}

Spring源码学习-PropertyPlaceholderHelper

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原文地址:http://www.cnblogs.com/fanguangdexiaoyuer/p/5788432.html

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