Stream<Object>到InputStream

import java.io.ByteArrayInputStream;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamToInputStreamExample {
    public static void main(String[] args) {
        Stream<Object> stream = Stream.of("Hello", "World");
        
        List<byte[]> byteArrayList = stream.map(Object::toString)
                                          .map(String::getBytes)
                                          .collect(Collectors.toList());
        
        byte[] byteArray = byteArrayList.stream()
                                        .reduce(new byte[0], StreamToInputStreamExample::concatArrays);
        
        ByteArrayInputStream inputStream = new ByteArrayInputStream(byteArray);
        
        // 现在可以使用inputStream读取数据了
    }
    
    private static byte[] concatArrays(byte[] a, byte[] b) {
        byte[] result = new byte[a.length + b.length];
        System.arraycopy(a, 0, result, 0, a.length);
        System.arraycopy(b, 0, result, a.length, b.length);
        return result;
    }
}