Jfinal loading configuration file principle

重点：看findFile方法,代码中mainmethods are only used for testing purposes

This code is modeled afterjfinal书写,Little to no additions of its own,It can be used to load files by yourself
配置文件名为：test.properties;
配置文件内容为：test=123
输出结果为：123
Pay attention to the location of the configuration file：resources下

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Properties;

public class FindProperties {
    
    public static void main(String[] args) {
    
        FindProperties file = new FindProperties();
        Properties filePro = file.findFile("test.properties", "utf-8");
        String test = filePro.getProperty("test");
        System.out.println(test);
    }

    /** * 加载配置文件 * @param fileName * @param encoding */
    private Properties findFile(String fileName, String encoding) {
    
        Properties prop = null;
        InputStream in = null;
        try {
    
            ClassLoader ret = Thread.currentThread().getContextClassLoader();
            ret = ( ret != null ? ret : getClass().getClassLoader());
            in = ret.getResourceAsStream(fileName);
            if(in == null){
    
                throw new IllegalArgumentException("配置文件不存在："+fileName);//非法参数异常
            }
            prop = new Properties();
            prop.load(new InputStreamReader(in,encoding));
            return prop;
        }catch (IOException e){
    
            throw new RuntimeException("Wrong load file",e);
        }finally {
    
            if(in != null){
    
                try {
    
                    in.close();
                } catch (IOException e) {
    
                    //Logging off exception,The output representation is used here
                    System.out.println("关闭输入流异常："+e.getMessage());
                }
            }
        }
    }
}