配置文件修改后重读的功能

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

public class ConfigUtil {

private static Properties props = null;
private static File configFile = null;
private static long fileLastModified = 0L;

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

private static void load() {
try {
props.load(new FileInputStream(configFile));
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();
return props.getProperty(key);
}

}