Spring配置文件动态获取属性

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Properties;

/**
 * @author: caiyaming
 * @date: 2018-07-18 19:16
 */
public class SysConfig {
    private static Properties props = null;
    private static File configFile = null;
    private static long fileLastModified = 0L;
    //classpath下配置文件名
    private static String configFileName = "application.properties";

    private static void init() {
        URL url = SysConfig.class.getClassLoader().getResource(configFileName);
        configFile = new File(url.getFile());
        fileLastModified = configFile.lastModified();
        props = new Properties();
        load();
    }

    private static void load() {
        try {
            //注意清空,否则没有新值,会使用旧值
            props.clear();
            //获取属性
            props.load(new InputStreamReader(new FileInputStream(configFile),"UTF-8"));
            //获取文件修改时间
            fileLastModified = configFile.lastModified();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static String getConfig(String key) {
        if ((configFile == null) || (props == null)) init();
        if (configFile.lastModified() > fileLastModified) load(); //当检测到文件被修改时重新加载配置文件
        return props.getProperty(key);
    }

    public static void main(String[] args) throws IOException {
        System.out.println(getConfig("spring.redis.timeout111"));
    }
}

注:这里默认配置文件在classpath下.