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"));
    }
}