properties 文件解析

1.提供properties文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/future?useUnicode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

2.properties文件解析方法实现

package cn.xiaobing.util;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
 
public class PropertiesDemo01 {
    /**
     * 读取解析properties文件
     */
    public static void readProperties() {
        //java.util包下专门做properties文件解析的类=》Properties
        Properties properties = new Properties();
        File file = new File("src/test/resources/jdbc.properties");
        //判断文件是否存在
        if(file.exists()) {
            InputStream inStream = null;
            try {
                inStream = new FileInputStream(file);
                //通过调用Properties的load方法，实现文件的加载、解析
                properties.load(inStream);
            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                if(inStream != null) {
                    try {
                        inStream.close();//关闭流
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            String url = properties.getProperty("jdbc.url");
            System.out.println("url:"+url);
            System.out.println("username:"+properties.getProperty("jdbc.username"));
            System.out.println("password:"+properties.getProperty("jdbc.password"));
        }else {
            System.out.println("properties文件未找到，请核对提供文件路径！");
        }
    }
    public static void main(String[] args) {
        readProperties();
    }
}

3.执行输出

4.总结，不足之处后续修改补充！