最近项目中遇到一个问题，项目中有多个properties文件时获取指定properties文件中的值，并且可以修改指定properties中的值

import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.net.URLDecoder;
import java.util.Properties;

import org.apache.logging.log4j.util.PropertiesUtil;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.PropertiesLoaderUtils;

public class PropKit {
	public static Properties getProperties(String propFile) {
		try {
			String path = Thread.currentThread().getContextClassLoader().getResource("").getPath();
			Properties pro = new Properties();
			FileInputStream in = new FileInputStream(path+"/"+propFile);
			pro.load(in);
			in.close();
			return  pro;
		}catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	
	/***
	 * 动态获取配置文件内容不需要重启服务器
	 * @param proFileName 配置文件名称
	 * @param proKey 配置文件key值
	 * @return 返回对应key的值
	 */
	public static String getProperties(String proFileName,String proKey) {
		String retKeyVal = "";
		try {
			retKeyVal = PropertiesLoaderUtils.loadAllProperties(proFileName).get(proKey).toString();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return retKeyVal;
	}
	
	/***
	 * 动态修改配置文件并返回修改值
	 * @param fileName
	 * @param key
	 * @param value
	 * @return value
	 */
	public static String updateProperties(String fileName,String key,String value) {
		try {
			String filePath = PropertiesUtil.class.getClassLoader().getResource(fileName).getFile();
			filePath = URLDecoder.decode(filePath, "utf-8");
			Properties props = PropertiesLoaderUtils.loadProperties(new ClassPathResource(fileName));
			BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath)));
			props.setProperty(key, value);
			props.store(bw, "");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
		return value;
	}
}

通过注解的方式获取

import org.springframework.beans.factory.annotation.Value;
    @Value("${demo.name}")
    private String name;