我正在尝试编写一个小程序,让用户通过输入 jpg 图像的链接列表从 url 下载 jpg 文件。当我在 JCreator 的编译器中使用该过程时,它运行良好。但是,当我将它放入小程序时,我无法处理。我给出了 actionlistener 部分和下面程序的方法。你知道为什么它不工作吗?
动作监听器:
class DownloadListener implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String line = links.getText();
String[] linkarray = line.split("\n");
//int numOfLinks = linkarray.length;
String directoryUser = directory.getText();
try{
downloadImg(linkarray, directoryUser);
}
catch(IOException ex){
deneme.setText(ex.toString() + "Could not find file");
}
}
}
方法:
public void downloadImg(String[] linkarray, String directoryUser) throws IOException
{
for(int i=0; i<linkarray.length; i++)
{
URL url = new URL(linkarray[i]);
InputStream in = new BufferedInputStream(url.openStream());
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int n = 0;
while (-1!=(n=in.read(buf)))
{
out.write(buf, 0, n);
}
out.close();
in.close();
byte[] response = out.toByteArray();
int j = 1;
String address = directoryUser + "/" + "oda" + Integer.toString(j) + ".jpg";
BufferedOutputStream fos = new BufferedOutputStream(new FileOutputStream(address));
fos.write(response);
fos.close();
j++;
}
}