Question

我用一个按钮做了一个框架＆＃34;开始下载＆＃34;它可以从网站下载JAR。

问题是每当我点击开始下载按钮时，整个框架都会冻结，直到完成下载，然后它就会正常。

我该如何解决？

这里是单击按钮执行时的代码

 private void addToDesktop() throws IOException {

    URL url = new URL("urlremoved");
    URLConnection connection = url.openConnection();
    InputStream inputstream = connection.getInputStream();
    FileSystemView filesys = FileSystemView.getFileSystemView();
    filesys.getHomeDirectory();
    sizeOfClient = connection.getContentLength();
    BufferedOutputStream bufferedoutputstream = new BufferedOutputStream(new FileOutputStream(new File(clientDL.textField1.getText() + "/jarname.jar")));
    byte[] buffer = new byte[2048];
    int length;


    while(( length = inputstream.read(buffer)) > -1)
    {
        down += length;
        bufferedoutputstream.write(buffer, 0 , length);
         String text = clientDL.label1.getText();
        int perc = getPerc();

        if(perc <= 50)
        {
            text +=  getPerc() + "% done";
        }else
        {
            text ="Please wait until the jar is downloading...";
            text = text + (100 - perc) + " % remaining";
        }
    }

    if (down == sizeOfClient) {
        JOptionPane.showMessageDialog(clientDL.frame, "Download successful. It has been placed at : " + clientDL.textField1.getText() + "/jarname.jar", "Success!", JOptionPane.INFORMATION_MESSAGE);
        clientDL.frame.dispose();
        clientDL.frame.setVisible(false);

    }
    bufferedoutputstream.flush();
    bufferedoutputstream.close();
    inputstream.close();
    hideSplashScreen();
}

Answer 1

简短回答：如果你不希望它冻结，你需要在一个单独的线程上运行它。

有很多方法可以实现这一点。几乎所有都要求您将addToDestop（）方法提取到runnable类中。这个类可以扩展Thread或SwingWorker或任何那种性质。

您可以查看SwingWorker的以下链接。

http://www.oracle.com/technetwork/articles/javase/swingworker-137249.html

遵循伪代码会给你一个想法。

public class Downloader extends SwingWorker<VOID, VOID> {
    private String url;

    public Downloader(String url){
        this.url = url;
    }

    private void addToDesktop(){
        //your code
    }

    @override
    protected void doInBackground(){
        addToDesktop();
    }

    @override
    protected void done(){
        //success
    }
}

Answer 2

尝试使用Threads它会停止冻结你的框架

private Thread thread;

thread = new Thread(new Runnable(){
public void run(){
//Your code here
}
});
thread.start();

当我开始这个动作时为什么我的框架会冻结[下载]

2 个答案: