Java 如何使用JProgressBar显示文件复制进度?
我正在从事一个通过网络传输文件的项目,我想加入一个Java 如何使用JProgressBar显示文件复制进度?,java,jprogressbar,Java,Jprogressbar,我正在从事一个通过网络传输文件的项目,我想加入一个JProgressBar来显示文件传输过程中的进度,但我需要这方面的帮助 这是JProgressBar的教程,可能会有所帮助。听起来您应该使用,如中所述。另请参见。您可能会发现ProgressMonitorInputStream最简单,但如果这对您来说还不够,请查看其源代码以获得您想要的 InputStream in = new BufferedInputStream( new ProgressMoni
JProgressBar
来显示文件传输过程中的进度,但我需要这方面的帮助 这是JProgressBar的教程,可能会有所帮助。听起来您应该使用,如中所述。另请参见。您可能会发现ProgressMonitorInputStream最简单,但如果这对您来说还不够,请查看其源代码以获得您想要的
InputStream in = new BufferedInputStream(
new ProgressMonitorInputStream(
parentComponent,
"Reading " + fileName,
new FileInputStream(fileName)
)
);
要使用不同的传输方法,请用适当的流替换FileInputStream
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import javax.swing.JProgressBar;
....
public OutputStream loadFile(URL remoteFile, JProgressBar progress) throws IOException
{
URLConnection connection = remoteFile.openConnection(); //connect to remote file
InputStream inputStream = connection.getInputStream(); //get stream to read file
int length = connection.getContentLength(); //find out how long the file is, any good webserver should provide this info
int current = 0;
progress.setMaximum(length); //we're going to get this many bytes
progress.setValue(0); //we've gotten 0 bytes so far
ByteArrayOutputStream out = new ByteArrayOutputStream(); //create our output steam to build the file here
byte[] buffer = new byte[1024];
int bytesRead = 0;
while((bytesRead = inputStream.read(buffer)) != -1) //keep filling the buffer until we get to the end of the file
{
out.write(buffer, current, bytesRead); //write the buffer to the file offset = current, length = bytesRead
current += bytesRead; //we've progressed a little so update current
progress.setValue(current); //tell progress how far we are
}
inputStream.close(); //close our stream
return out;
}
我很肯定这会奏效。你应该详细说明你到底需要什么帮助。是将每个文件分解成数据包,还是只知道每个文件何时完成传输?你有百分比吗,只是需要帮助显示?您是否已经完成了文件复制过程?社区wiki?真的吗?我建议您查看一下java nio通道,以便将files.FYI复制出来。write(buffer,current,bytesRead)应该是out。write(buffer,0,bytesRead)