Java 文件上载无法正常运行
我有以下文件上传功能:Java 文件上载无法正常运行,java,android,file-upload,Java,Android,File Upload,我有以下文件上传功能: public void uploadFile(Context context, File file) { String urlServer = "https://u-database.000webhostapp.com/recieve_file.php"; if(file.isFile() && file.exists()) { String fileName = file.getAbsolu
public void uploadFile(Context context, File file) {
String urlServer = "https://u-database.000webhostapp.com/recieve_file.php";
if(file.isFile() && file.exists()) {
String fileName = file.getAbsolutePath();
try {
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
Toast toastw = Toast.makeText(context, "Inside TRY", Toast.LENGTH_SHORT);
toastw.show();
FileInputStream fileInputStream = new FileInputStream(file);
URL url = new URL(urlServer);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true); // Allow Inputs
conn.setDoOutput(true); // Allow Outputs
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
conn.setRequestProperty("textLog", fileName);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"textLog\";filename=\""+fileName+"\""+lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// Responses from the server (code and message)
int serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
Toast toast = Toast.makeText(context, "Uploading", Toast.LENGTH_SHORT);
toast.show();
if(serverResponseCode == 200){
file.delete();
Toast toasto = Toast.makeText(context, "success", Toast.LENGTH_SHORT);
toasto.show();
}
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
Toast toast = Toast.makeText(context, "Malformed URL", Toast.LENGTH_SHORT);
toast.show();
} catch (Exception e) {
Toast toast = Toast.makeText(context, "Exception", Toast.LENGTH_SHORT);
toast.show();
}
}
}
每次执行时,都会出现一个toast,说明内部尝试,然后出现另一个toast,说明“异常”。
我一直在调试,非常感谢您的帮助:)
更新
当我做了
e.toString
并把它打印出来作为祝酒词时,我得到了:android.os.NetworkOnMainThreadException
那么答案很简单。您应该在后台线程上运行网络调用。您需要扩展AsyncTask
,并将代码移到其中。比如:
private class InitTask extends AsyncTask<Void, Void, Void>{
protected Void doInBackground(Void... p){
// Call upload file code here
}
}
私有类InitTask扩展了异步任务{
受保护的空位背景(空位…p){
//在这里调用上传文件代码
}
}
如果您检查了ex
提供的功能(例如printStackTrace
或类似功能),它会告诉您更多信息,@Itamagreen感谢您的关注,它通常是BroadcastReceiver的一部分,因此我无法在AVD中调试它,因为它没有任何活动。所以基本上是没有希望的。你知道获取stacktraces的其他方法吗?好吧,要记录异常,你可以参考这里:@Itamagreen where?我没有看到链接,你不能编辑代码并打印出异常的toString()吗?它可以是一个内部类吗?当然可以。您可以在本教程中查看更多解释和示例:。缺少return语句@DoronYakovlev golanisold通过添加return null来解决它,现在就测试它。但我真的不能在那里显示祝酒词。这只是一个伪代码框架(我没有编译它)。。。你必须填写细节。