spring配置文件

读取配置文件，先读取config目录，再读取user.dir目录，再读取默认classpath目录。

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class PropertiesUtil {
    public static Properties getProperties(String fileName) {
        try {
            String outPath = System.getProperty("user.dir") + File.separator + "config" + File.separator + fileName;//先读取config目录的，没有再加载classpath的
            if (!new File(outPath).exists()) {
                outPath = System.getProperty("user.dir") + File.separator + fileName;
            }
            Properties properties = new Properties();
            InputStream in = new FileInputStream(new File(outPath));
            properties.load(in);
            return properties;
        } catch (IOException e) {
            System.out.println(e.getMessage());
            try {
                Properties properties = new Properties();
                InputStream in = PropertiesUtil.class.getClassLoader().getResourceAsStream(fileName);//默认加载classpath的
                properties.load(in);
                return properties;
            } catch (IOException es) {
                System.out.println(es.getMessage());
                return null;
            }
        }
    }
}