将文件加载为InputStream的不同方法

import java.io.FileInputStream;
import java.io.InputStream;

public class FileInputStreamExample {
    public static void main(String[] args) {
        try {
            InputStream inputStream = new FileInputStream("file.txt");
            // 处理InputStream
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

import java.io.InputStream;

public class ClassLoaderExample {
    public static void main(String[] args) {
        ClassLoader classLoader = ClassLoaderExample.class.getClassLoader();
        InputStream inputStream = classLoader.getResourceAsStream("file.txt");
        // 处理InputStream
    }
}

import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;

public class NIOExample {
    public static void main(String[] args) {
        try {
            InputStream inputStream = Files.newInputStream(Paths.get("file.txt"));
            // 处理InputStream
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.stream.Collectors;

public class StreamExample {
    public static void main(String[] args) {
        try {
            InputStream inputStream = Files.lines(Paths.get("file.txt"), StandardCharsets.UTF_8)
                    .collect(Collectors.joining("\n"))
                    .getBytes(StandardCharsets.UTF_8)
                    .inputStream();
            // 处理InputStream
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}