java-工具类-读取配置文件

package com.zg.config;

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

/**
* 系统配置文件读取
* @author huage
*
*/
public class SysConfig {
private static Properties props = null;
private static File configFile = null;
private static long fileLastModified = 0L;

private static String configFileName = "properties/sys/system.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 {
props.load(new InputStreamReader(new FileInputStream(configFile),"UTF-8"));
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){
System.out.println(getConfig("sys.index.name"));
}}