如何使用注释在 Spring 4 中重新加载属性文件? [英] How can I reload properties file in Spring 4 using annotations?

问题描述

我有一个简单的应用程序，我在其中使用多个属性文件来获取其他用户编辑的内容(站点链接等).

I have a simple application where i am using several properties-files to fetch content edited by other users (links to sites etc).

我加载属性的类如下所示:

The class where i load the properties look like this:

@Configuration
@PropertySource("classpath:salestipsWhitelist.properties")
public class SalestipsWhitelist {

@Autowired
Environment env;

public Environment getEnv() {
    return env;
}

public void setEnv(Environment env) {
    this.env = env;
}

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

一些属性文件:

UPS_MPP_M_L=True
UPS_MPP_M_M=True
UPS_MPP_M_MP=True
UPS_MPP_M_S=True

这工作正常，但如果我对属性文件进行更改，我必须重新加载应用程序以查看所做的任何更改.

This works fine, but if i make changes to the properties-file, i have to reload the app to visualise any changes made.

如果我将位置移动到磁盘而不是类路径，是否可以定期或手动重新加载?我不希望这在更改时自动完成，因为我想控制何时完成/更新.

Is it possible, if i move the location to disk instead of classpath, to reload this periodically or manually? I do not want this to be done automatically on change, as i want to have control over when this is done / updated.

推荐答案

这是一种享受.需要 Java 7、Apache commons logging、Apache commons lang (v2.6) 和 Apache commons 配置:

This works a treat. Requires Java 7, Apache commons logging, Apache commons lang (v2.6) and Apache commons Configuration:

package corejava.reloadTest;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;

public class MyApplicationProperties {
    private static PropertiesConfiguration configuration = null;

    static {
        try {
            configuration = new PropertiesConfiguration("test.properties");
        } catch (ConfigurationException e) {
            e.printStackTrace();
        }
        configuration.setReloadingStrategy(new FileChangedReloadingStrategy());
    }

    public static synchronized String getProperty(final String key) {
        return (String) configuration.getProperty(key);
    }
}

并使用以下方法进行测试:

and test it with:

package corejava.reloadTest;

public class TestReloading {
    public static void main(String[] args) {
        while (true) {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(MyApplicationProperties.getProperty("key"));
        }
    }
}

更改test.properties时的输出是这样的(test.props的原始内容是key=value，后来在程序执行中改为key=value1):

Output when you change test.properties is something like this (original contents of test.props was key=value, later changed to key=value1 mid-program execution):

value
value
value
value
value
Jan 17, 2015 2:05:26 PM org.apache.commons.configuration.PropertiesConfiguration reload
INFO: Reloading configuration. URL is file:/D:/tools/workspace   /AutoReloadConfigUsingApacheCommons/resources/test.properties
value1
value1
value1

您还可以考虑官方 Spring 框架参考文档 Refreshable beans ，为此使用 DSL(例如 Groovy).

You could also consider Official Spring Framework Reference Documentation Refreshable beans , using a DSL like Groovy for this.

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