要给出“部分内容从Java URL连接流式传输”包含代码示例的解决方法，我们可以使用Java的URL和URLConnection类来实现。以下是一个简单的示例代码：

import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class URLStreamExample {
    public static void main(String[] args) {
        String urlString = "http://example.com/file.txt";
        String outputFileName = "output.txt";
        int bufferSize = 1024;

        try {
            URL url = new URL(urlString);
            URLConnection connection = url.openConnection();
            InputStream inputStream = connection.getInputStream();
            BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
            FileOutputStream fileOutputStream = new FileOutputStream(outputFileName);

            byte[] buffer = new byte[bufferSize];
            int bytesRead;
            while ((bytesRead = bufferedInputStream.read(buffer)) != -1) {
                fileOutputStream.write(buffer, 0, bytesRead);
            }

            fileOutputStream.close();
            bufferedInputStream.close();
            inputStream.close();

            System.out.println("File downloaded successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

上面的代码会从指定的URL下载文件，并将其写入本地文件output.txt。它使用了缓冲区来提高性能，以及流式读取和写入来处理大文件。你可以将"urlString"替换为你想要下载的URL，并将"outputFileName"替换为你想要保存的文件名。