Read a file from resources folder in java

摘要：在这篇文章中，我们将看到如何从java的resources文件夹中读取文件。如果您创建了maven项目（简单的java或动态web项目），您将看到文件夹src/jav/resources。您可以使用这些简单的代码从resources文件夹中读取数据。

// Getting ClassLoader obj
            ClassLoader classLoader = this.getClass().getClassLoader();
            // Getting resource(File) from class loader
            File configFile = new File(classLoader.getResource(fileName).getFile());

项目结构

Java Program:

package cn.micai.io;

import java.io.*;
import java.util.Properties;

/**
 * 描述：How to read properties file in java
 * <p>
 *
 * @author: 赵新国
 * @date: 2018/6/7 13:25
 */
public class ReadPropertiesFileJavaMain {

    public static void main(String [] args) throws IOException {

        ReadPropertiesFileJavaMain rp = new ReadPropertiesFileJavaMain();
        System.out.println("Reading file from resources folder");
        System.out.println("-----------------------------");

        rp.readFile("config.properties");

        System.out.println("-----------------------------");


    }

    public void readFile(String fileName) {
        FileInputStream fileInputStream = null;
        try {
            // Getting ClassLoader obj
            ClassLoader classLoader = this.getClass().getClassLoader();
            // Getting resource(File) from class loader
            File configFile = new File(classLoader.getResource(fileName).getFile());

            fileInputStream = new FileInputStream(configFile);
            BufferedReader reader = new BufferedReader(new InputStreamReader(fileInputStream));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fileInputStream != null) {
                    fileInputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

当您运行在程序之上时，您将得到以下输出。