java代码,计算网络带宽占有率,不使用android包

以下是一个简单的Java代码示例，用于计算网络带宽占用率：

import java.util.Date;

public class BandwidthCalculator {

    private long bytesTransferred;
    private Date startTime;
    private Date endTime;

    public void startTransfer() {
        startTime = new Date();
    }

    public void endTransfer(long bytes) {
        bytesTransferred = bytes;
        endTime = new Date();
    }

    public double getBandwidth() {
        long timeDiff = endTime.getTime() - startTime.getTime();
        double seconds = timeDiff / 1000.0;
        double bytesPerSecond = bytesTransferred / seconds;
        return bytesPerSecond * 8 / 1000000; // convert to Mbps
    }
}

使用示例：

BandwidthCalculator calculator = new BandwidthCalculator();
calculator.startTransfer();
// perform file download or network transfer here
calculator.endTransfer(1024 * 1024 * 10); // 10MB transferred
double bandwidth = calculator.getBandwidth();
System.out.println("Bandwidth: " + bandwidth + " Mbps");

注意：这只是一个简单的示例，实际情况可能更加复杂，需要考虑网络延迟、吞吐量等因素。