Java 中的资源、URI、URL、路径和文件有什么区别

java
public class ResourceExample {
    public static void main(String[] args) {
        // 使用类加载器加载资源
        InputStream inputStream = ResourceExample.class.getClassLoader().getResourceAsStream("config.properties");
        if (inputStream != null) {
            // 读取资源中的数据
            try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
                String line;
                while ((line = reader.readLine()) != null) {
                    System.out.println(line);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

java
public class URIExample {
    public static void main(String[] args) {
        try {
            // 创建URI对象
            URI uri = new URI("https://www.example.com/resource");
            // 打开连接
            HttpURLConnection connection = (HttpURLConnection) uri.toURL().openConnection();
            // 设置请求方式
            connection.setRequestMethod("GET");
            // 获取响应码
            int responseCode = connection.getResponseCode();
            System.out.println("Response code: " + responseCode);
        } catch (IOException | URISyntaxException e) {
            e.printStackTrace();
        }
    }
}

java
public class URLOxample {
    public static void main(String[] args) {
        try {
            // 创建URL对象
            URL url = new URL("https://www.example.com/resource");
            // 打开连接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            // 设置请求方式
            connection.setRequestMethod("GET");
            // 获取响应码
            int responseCode = connection.getResponseCode();
            System.out.println("Response code: " + responseCode);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

java
import java.nio.file.*;
public class PathExample {
    public static void main(String[] args) {
        // 创建路径对象
        Path path = Paths.get("/path/to/file.txt");
        // 获取文件名
        String fileName = path.getFileName().toString();
        System.out.println("File name: " + fileName);
        // 获取父路径
        Path parentPath = path.getParent();
        System.out.println("Parent path: " + parentPath);
        // 判断路径是否存在
        boolean exists = Files.exists(path);
        System.out.println("Exists: " + exists);
    }
}

java
import java.io.*;
public class FileExample {
    public static void main(String[] args) {
        // 创建文件对象
        File file = new File("/path/to/file.txt");
        // 判断文件是否存在
        boolean exists = file.exists();
        System.out.println("Exists: " + exists);
        // 创建文件
        try {
            boolean created = file.createNewFile();
            System.out.println("Created: " + created);
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 删除文件
        boolean deleted = file.delete();
        System.out.println("Deleted: " + deleted);
    }
}