Read a file from resources folder in java

秒速五厘米 2024-02-18 20:57 150阅读 0赞

**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

![20180607140458497][]

#### 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。

![20180607140642251][]

[20180607140458497]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/53d386f6e91742a985d13334b6aca6f4.png
[20180607140642251]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/8e63ebf5c1aa4c71b90bc7ebfdf1b7b4.png