我正在使用以下代码来确保文件内容成功写入磁盘
public void copyFileFromUrl(URL source, File target, int count) throws IOException {
InputStream in = null;
OutputStream out = null;
if (target != null) {
try {
if (!target.exists()) {
target.createNewFile();
if (source == null) {
return;
} else {
in = source.openStream();
}
out = new FileOutputStream(target);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
log.debug("The contents from the URL: " + source + " are successfully written to the file " + target);
//add for successfull
} else {
log.debug("skipping creation of asset");
}
} catch (Exception e) {
if(count < 3){
if (in != null) {
in.close();
}
if (out != null) {
out.close();
}
// Attempt to delete it
boolean success = target.delete();
if (!success) {
log.debug("Unable to delete " + target);
} else {
copyFileFromUrl(source, target, ++count);
}
} else {
log.debug(e.getClass().getName());
e.printStackTrace();
}
} finally {
if (in != null) {
in.close();
}
if (out != null) {
out.close();
}
}
}
}
我这样称呼这段代码
while(iter.hasNext()) {
CourseMaterials cm = iter.next();
String url;
try {
Asset asset = cm.getAsset();
List<AssetVersion> av = asset.getAssetVersions();
} catch (Exception e1) {
log.debug("Bad asset so skipping...");
e1.printStackTrace();
continue;
}
....
try {
URL earl = new URL(visualElementURL);
scormFileWriter.copyFileFromUrl(earl, new File(absoluteFileName), 0);
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
现在我尝试的方式是,当我开始工作时copyFileFromUrl()
,我拔下电缆,它尝试了两次,然后第三次插入电缆。函数成功返回。正如我在while循环中一样。现在,当我来排队时
Asset asset = cm.getAsset();
我明白了Connection Reset by peer exception
。它会跳过此资产,然后再次正常启动。为什么 ?为什么我得到connection Reset by peer exception
?如果我因为拔掉电缆而得到这个异常,那么我也应该为所有其他资产得到它,但我只在下一次迭代中得到这个异常,然后它开始正常工作,我的意思是,Asset asset = cm.getAsset();
在第一次抛出后,行不会抛出异常时间?
为什么会这样?我怎样才能克服它?
我正在使用 SQL Server 2008 作为数据库。
谢谢