Java代码读取properties配置文件的示例代码

package com.easycrud.utils;

import java.io.IOException;

import java.io.InputStream;

import java.util.Iterator;

import java.util.Map;

import java.util.Properties;

import java.util.concurrent.ConcurrentHashMap;

/**

  * @BelongsProject: EasyCrud

  * @BelongsPackage: com.easycrud.utils

  * @Author: xpx

  * @Email: 2436846019@qq.com

  * @CreateTime: 2023-05-02  16:05

  * @Description: 读取properties配置文件工具类

  * @Version: 1.0

  */

public class PropertiesUtils {

     private static Properties props = new Properties();

     private static Map<String,String> PROPER_MAP = new ConcurrentHashMap<String, String>();

     /**

      * 项目初始化时就去读取配置文件

      */

     static {

         InputStream is = null ;

         try {

             is = PropertiesUtils. class .getClassLoader().getResourceAsStream( "application.properties" );

             props.load(is);

             Iterator<Object> iterator = props.keySet().iterator();

             while (iterator.hasNext()){

                 String key = (String) iterator.next();

                 PROPER_MAP.put(key,props.getProperty(key));

             }

         } catch (Exception e){

         } finally {

             if (is != null ){

                 try {

                     is.close();

                 } catch (IOException e) {

                     e.printStackTrace();

                 }

             }

         }

     }

     /**

      * 对外提供方法通过key取值

      * @param key

      * @return

      */

     public static String getString(String key) {

         return PROPER_MAP.get(key);

     }

     /**

      * 测试能否成功取值

      * @param args

      */

     public static void main(String[] args) {

         System.out.println( "测试打印：" +getString( "db.driver.name" ));

     }

}