Question

我正在使用当前代码，该代码成功下载并运行来自互联网的jar文件：

package Joehot200;

import java.awt.EventQueue;
import java.io.BufferedReader;
import java.io.EOFException;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLConnection;

public class Main {

String version = "0.4";
boolean needDownload = false;

public void needDownload(){
StringBuilder page = new StringBuilder();
URL google;
try {
    google = new URL("http://www.endcraft.net/ver");

//URL google = new URL("www.endcraft.net/Post");
URLConnection yc = google.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null) {
    System.out.println(inputLine + " || " + version);
    if (!inputLine.contains(version)){
        needDownload = true;
        System.out.println("Downloading!");
    }else{
        System.out.println("No downloaded needed!");
    }
}
} catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
}

public Main() {

    needDownload();
    if (needDownload){
        try {
        URL url = new URL("http://www.endcraft.net/webstart/privateers.jar");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

            conn.setRequestMethod("HEAD");
            download("http://www.endcraft.net/webstart/privateers.jar", "privateers.jar", conn.getContentLength());
        } catch (Exception e) {
            e.printStackTrace();
        }

    try {
        String exec = (System.getProperty("user.dir") + "\\privateers.jar");
        String[] command = {"javaw", "-jar", exec};  
        final Process process = Runtime.getRuntime().exec(command);
        System.out.println("Running " + exec);
        System.exit(0);

    } catch (IOException e1) {
        e1.printStackTrace();
    }
    }

}
void download(String source, String destination, int size) {
    // ten percent of the total download size
    File ofile = new File(System.getProperty("user.dir") + "", destination);
    System.out.printf("\nDownloading\n\t%s\nTo\n\t%s\n", source, destination);
    try {
        if (ofile.exists()) ofile.delete();
        if (!ofile.createNewFile()) {
            throw new IOException("Can't create " + ofile.getAbsolutePath());
        }

        int inChar = 0;
        URL url = new URL(source);
        InputStream input = url.openStream();
        FileOutputStream fos = new FileOutputStream(ofile);
        for (int i = 0; i < size && inChar != -1; i++) {
            inChar = input.read();
            fos.write(inChar);
        }

        input.close();
        fos.close();
        System.out.println("Downloaded " + ofile.getAbsolutePath());
    } catch (EOFException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
public static void main(String[] args) {

                Main frame = new Main();
}
}

但是，出于某种原因，它会一直打开我多次下载的应用程序，即使我打开它后立即调用system.exit（0）！

另外，我无法终止此过程。如果我点击＆＃34;终止＆＃34;在eclipse中，该过程不会终止并保持打开的东西。即使在关闭Eclipse之后，它仍然在运行并打开窗口。我至少可以和任务经理一起杀掉它，但这对游戏来说并不是很好。

我该如何解决这个问题？我的代码中的错误在哪里？

谢谢！

无法使用eclipse终止进程。并打开多个窗口？

0 个答案: