Sending byte array to server
Does anyone know how to send a byte array to the server?
What is contained in the byte array? Is it audio/video/image?
If you can get a binary representation of it, you could probably
convert it to Base64 and send it over as a string and reconvert to
binary on the server.
Similar Messages
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How to send byte array and String values to servlet from Swing application
Hi all,
I am new to swing, servlet, and socket connection.
I have swing application to draw images and some input data. I dont know to send to server.
byte[] buf = baos.toByteArray();
URL servletURL = new URL("http://10.70.70.1:8080/servlet/SaveImage)
URLConnection conn = servletURL.openConnection();
conn.setDoOutput(true);
BufferedWriter out = new BufferedWriter( new OutputStreamWriter( conn.getOutputStream() ) );
out.write(buf&a=aaaa&b=bbbbb);
out.flush();
out.close();
can I do like this. Strings are received in server side perfect. but i cant get byte array data. Please help me.
Thanks in advance.<img src="myservlet">
In your myservlet:
response.setContentType("image/jpeg");
then write your image date via ImageIO that uses response output stream. -
Create image from byte[]array on server side
Hello everyone..
I'm developing an application which will take snapshots from a mobile device, and send it to my pc via bluetooth. I have my own midlet which uses the phone camera to take the snapshot, i want to transfer that snapshot to my pc.
The snapshot is taken is stored in an array byte.
The image can be created on the phone itself with no problem using : image.createImage(byte[])
my problem is that when i send the array byte via bluetooth, and receive it on the server, i cannot create the image using the :image.createImage() code
The connection is good since i have tested by writing the content of the array in a text file.
Piece of midlet code:
try{
stream = (StreamConnection)Connector.open(url);
OutputStream ggt = stream.openOutputStream();
ggt.write(str);
ggt.close();
}catch(Exception e){
err1 = e.getMessage();
}where str is my array byte containing the snapshot
And on my server side:
Thread th = new Thread(){
public void run(){
try{
while(true){
byte[] b = new byte[in.read()];
int x=0;
System.out.println("reading");
r = in.read(b,0,b.length);
if (r!=0){
System.out.println(r);
img = Image.createImage(b, 0, r);
//other codes
i get this error message:
Exception in thread "Thread-0" java.lang.UnsatisfiedLinkError: javax.microedition.lcdui.ImmutableImage.decodeImage([BII)V
at javax.microedition.lcdui.ImmutableImage.decodeImage(Native Method)
at javax.microedition.lcdui.ImmutableImage.<init>(Image.java:906)
at javax.microedition.lcdui.Image.createImage(Image.java:367)
at picserv2$1.run(picserv2.java:70)
Please anyone can help me here? is this the way to create the image on the server side? thx a lothere is exactly how i did it :
while(true){
byte[] b = new byte[in.read()];
System.out.println("reading");
r = in.read(b, 0, b.length);
if (r!=0){
Toolkit toolkit = Toolkit.getDefaultToolkit();
Image img = toolkit.createImage(b, 0, b.length);
JLabel label = new JLabel(new ImageIcon(img) );
BufferedImage bImage = new BufferedImage(img.getWidth(label),img.getHeight(label),BufferedImage.TYPE_INT_RGB);
bImage.createGraphics().drawImage(img, 0,0,null);
File xd = new File("D:/file.jpg");
ImageIO.write(bImage, "jpg", xd);
System.out.println("image sent");
}Edited by: jin_a on Mar 22, 2008 9:58 AM -
Another question?? being able to send byte arrays containing multiple types
Hi,
I have a question which I would really appreciate any help on.
I am trying to send a byte array, that contains multiple types using a UDP app. and then receive it on the other end.
So far I have been able to do this using the following code. Please note that I create a new String, Float or Double object to be able to correctly send and receive. Here is the code:
//this is on the client side...
String mymessage ="Here is your stuff from your client" ;
int nbr = 22; Double nbr2 = new Double(1232.11223);
Float nbr3 = new Float(8098098.809808);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(mymessage);
oos.writeInt(nbr);
oos.writeObject(nbr2);
oos.writeObject(nbr3);
oos.close();
byte[] buffer = baos.toByteArray();
socket.send(packet);
//this is on the server side...
byte [] buffer = new byte [5000];
String mymessage = null; int nbr = 0; Double nbr2 = null;
Float nbr3 = null;
mymessage = (String)ois.readObject();
nbr = ois.readInt();
nbr2 = (Double) ois.readObject();
nbr3 = (Float) ois.readObject();
My main question here is that I have to create a new Float and Double object to be able to send and receive this byte array correctly. However, I would like to be able to have to only create 1object, stuff it with the String, int, Float and Double, send it and then correctly receive it on the other end.
So I tried creating another class, and then creating an obj of this class and stuffing it with the 4 types:
public class O_struct{
//the indiv. objects to be sent...
public String mymessage; public int nbr; public Double nbr2;
public Float nbr3;
//construct...
public O_struct(String mymessage_c, int nbr_c, double nbr2_c, float nbr3_c){
my_message = my_message_c;
nbr = nbr_c;
nbr2 = new Double(nbr2_c);
nbr3 = new Float(nbr3_c);
Then in main, using this new class:
in main():
O_struct some_obj_client = new O_struct("Here is your stuff from your client", 22, 1232.1234, 890980980.798);
oos.writeObject(some_obj_client);
oos.close();
send code....according to UDP
However on the receiving side, I am not sure how to be able to correctly retrieve the 4 types. Before I was explicitely creating those objects for sending, then I was casting them again on the receiving side to retrieve then and it does work.
But if I create a O_struct object and cast it as I did before with the indiv objects on the receiving end, I can't get the correct retrievals.
My code, on the server side:
O_struct some_obj_server = new O_struct(null, null, null. null);
some_obj_server = (O_struct)ois.readObject();
My main goal is to be able to send 4 types in a byte array, but the way I have written this code, I have to create a Float and Double obj to be able to send and receive correctly. I would rather not have to directly create these objects, but rather just create one object and be able to send and receive the information on both ends
I might be making this more complicated than needed, but this was the only way I could figure out how to do this and any help will be greatly appreciated.
If there an easier way to do I certainly will appreciate that advise as well.
Thanks.which forum should I be posting this on?Serialization.
To get you started...
public class O_struct implements Serializable { -
How to send byte array of image with 300dpi.
Hello fiends
i am making an application in which i have to send the byte array of an image with 300dpi.
so i am using image snapshot class for that and use that code.
var snapshot:ImageSnapshot = ImageSnapshot.captureImage(cnvParent,300);
var bdata:String = ImageSnapshot.encodeImageAsBase64(snapshot);
but when i send that bdata to php end using httpService.The size at other end of image increases surprisingly.i means it will increase its actual height and actual width.so is there any way to overcome this increase in size when i bitmapped image at 300 dpi?
if there any way then please tell me.waiting for your reply.
Thanks and Regards
Vineet OshoThanks david for such a quick reply.the link is really helpful.So we have to calculate the screendpi thruogh our code and then set the height and width of image.is there any simple way to sort out my problem.i just want to print my image at 300dpi but i am using image snapshot class so its taking the snap of my container(image) and save the image at 96 dpi which is dpi of my screen(monitor).so is there any way or any class in flex through which i got the image at its original dpi.i am not stick on 300 dpi but i m getting image from backend through xml at 300dpi.thats why i want the byte array i am sending should be at 300dpi.i am totally confused now.so please help me.
Thanks and regards
Vineet osho -
Send byte array argeument from pl/sql to java stored procedure?
I have a java method that accepts an argument of type byte[].
I want to define a call specification so that it can invoked from a sql statement.
The Java Developer's Guide show how to map SQL data types to java types and classes, but it is unclear if I can map a SQL data type to an array.
Does anyone know which SQL type to use to map to a byte array?
I'm using Oracle 10.2, thus jvm 1.4.2.As soon as I posted this question, I saw the RAW to byte[] mapping listed in the documentation. How did I overlook it? Anyway, that what I needed.
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How to create PNG file from byte array of RGB value?
Hi
Here is my problem.
I have drawn some sketchs (through code in runtime) on canvas. I have grabbed the RGB information for the drwan image and converted to byte array.
I have to pass this byte array to server and generate a png file and save.
Please help.{color:#ff0000}Cross posted{color}
http://forum.java.sun.com/thread.jspa?threadID=5218093
{color:#000080}Cross posting is rude.
db{color} -
How to read an inputStream in UTF-8 into a byte array.
Hi, Java version is 1.4.2. If inputStream.read() is used to read the bytes into a byte array, is it guarenteed that UTF-8 chars are correctly transferred into byte array? Or should we use InputStreamReader? An example would be a great help.
Thanks in advance.I would like to send a byte array read from InputStream to another app where they are converted to UTF-8. In brief
-Read input stream which comes in UTF-8 into a byte array
-Send byte array to another app which will convert it into UTF-8 characters -
How Convert a Byte array to a image format
Hi,
How to convert a Byte array to an image format....I shall be more clear what i want...See i recieve a Byte array fom server this Byte array before recieveing at my end it was converted from an image/text format into a Byte array and is sent from server and, I recieve this Byte array now I have to convert this Byte array into their respective image....please tell me how to convert a Byte array to a image ......... Kindly explain clearly as i am new to Java......
Thanking You.Note: This thread was originally posted in the [New To Java|http://forums.sun.com/forum.jspa?forumID=54] forum, but moved to this forum for closer topic alignment.
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Sending publickey through the network as a byte array.
I send client public key form server to client as a byte array through the network. I'm sruggling when I get that byte array from client side and again assign to the PublicKey variable. Anyone can give me any hints how can I extract the public key from the byte array.
Thank youIf your public key is from an X509 certificate, you can use the X509EncodedKeySpec class.
-
Trying to send multiple types in a byte array -- questions?
Hi,
I have a question which I would really appreciate any help on.
I am trying to send a byte array, that contains multiple types using a UDP app. and then receive it on the other end.
So far I have been able to do this using the following code. Please note that I create a new String, Float or Double object to be able to correctly send and receive. Here is the code:
//this is on the client side...
String mymessage ="Here is your stuff from your client" ;
int nbr = 22; Double nbr2 = new Double(1232.11223);
Float nbr3 = new Float(8098098.809808);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(mymessage);
oos.writeInt(nbr);
oos.writeObject(nbr2);
oos.writeObject(nbr3);
oos.close();
byte[] buffer = baos.toByteArray();
socket.send(packet);
//this is on the server side...
byte [] buffer = new byte [5000];
String mymessage = null; int nbr = 0; Double nbr2 = null;
Float nbr3 = null;
mymessage = (String)ois.readObject();
nbr = ois.readInt();
nbr2 = (Double) ois.readObject();
nbr3 = (Float) ois.readObject();
My main question here is that I have to create a new Float and Double object to be able to send and receive this byte array correctly. However, I would like to be able to have to only create 1object, stuff it with the String, int, Float and Double, send it and then correctly receive it on the other end.
So I tried creating another class, and then creating an obj of this class and stuffing it with the 4 types:
public class O_struct{
//the indiv. objects to be sent...
public String mymessage; public int nbr; public Double nbr2;
public Float nbr3;
//construct...
public O_struct(String mymessage_c, int nbr_c, double nbr2_c, float nbr3_c){
my_message = my_message_c;
nbr = nbr_c;
nbr2 = new Double(nbr2_c);
nbr3 = new Float(nbr3_c);
Then in main, using this new class:
in main():
O_struct some_obj_client = new O_struct("Here is your stuff from your client", 22, 1232.1234, 890980980.798);
oos.writeObject(some_obj_client);
oos.close();
send code....according to UDP
However on the receiving side, I am not sure how to be able to correctly retrieve the 4 types. Before I was explicitely creating those objects for sending, then I was casting them again on the receiving side to retrieve then and it does work.
But if I create a O_struct object and cast it as I did before with the indiv objects on the receiving end, I can't get the correct retrievals.
My code, on the server side:
O_struct some_obj_server = new O_struct(null, null, null. null);
some_obj_server = (O_struct)ois.readObject();
My main goal is to be able to send 4 types in a byte array, but the way I have written this code, I have to create a Float and Double obj to be able to send and receive correctly. I would rather not have to directly create these objects, but instead be able to stuff all 4 types into a byte array and then send it and correctly be able to retrieve all the info on the receiver's side.
I might be making this more complicated than needed, but this was the only way I could figure out how to do this and any help will be greatly appreciated.
If there an easier way to do I certainly will appreciate that advise as well.
Thanks.public class O_struct implements Serializable {
// writing
ObjectOutputStream oos = ...;
O_struct struct = ...;
oos.writeObject(struct);
// reading
ObjectInputStream ois = ...;
O_struct struct = (O_struct)ois.readObject();
I will be sending 1000s of these byte arrays, and I'm sure having to create a new Double or Float on both ends will hinder this.
I am worried that having to create new objs every time it is sending a byte array will affect my application.
That's the wrong way to approach this. You're talking about adding complexity to your code and fuglifying it because you think it might improve performance. But you don't know if it will, or by how much, or even if it needs to be improved.
Personally, I'd guess that the I/O will have a much bigger affect on performance than object creation (which, contrary to popular belief, is generally quite fast now: http://www-128.ibm.com/developerworks/java/library/j-jtp01274.html)
If you think object creation is going to be a problem, then before you go and cock up your real code to work around it, create some tests that measure how fast it is one way vs. the other. Then only use the cock-up if the normal, easier to write and maintain way is too slow AND the cock-up is significantly faster. -
Sending a Byte array through a socket
Can someone please tell me how i can send a Byte array from a client to a sever using sockets?
Thanks
MarkThis tutorial should do the trick:
http://java.sun.com/docs/books/tutorial/networking/sockets/index.html -
Need to send and receive larger byte array
I have a small WCF service, self hosted in a console app. On the same computer I have a client application. Both are running in the debugger in VS2008. The proxy code and the config file were generatred from the running service using svcutil.
In one of the service calls, the service reads a pdf file and sends the contents as a byte array. The client receives the byte array, saves it as a pdf file, and displays it.
Everything is fine for all other kinds of calls, and this one works fine also as long as the file is small (say 14K). But if the file is larger (say 84K), the client crashes (VHOST has stopped working).
Is there some kind of setting that will allow me to send and receive larger byte arrays (> 100 K)?
Thanks,
Jon Jacobs
In transmission, subatomic particles managed by professionals.
No innocent electrons were harmed.Hi Jon,
You'll want something like this to increase the message size quotas:
<bindings>
<basicHttpBinding>
<binding name="basicHttp" allowCookies="true"
maxReceivedMessageSize="20000000"
maxBufferSize="20000000"
maxBufferPoolSize="20000000">
<readerQuotas maxDepth="32"
maxArrayLength="200000000"
maxStringContentLength="200000000"/>
</binding>
</basicHttpBinding>
</bindings>
The justification for the values is simple, they are sufficiently large to accommodate most messages. You can tune that number to fit your needs. The low default value is basically there to prevent DOS type attacks. Making it 20000000 would allow for a distributed
DOS attack to be effective, the default size of 64k would require a very large number of clients to overpower most servers these days.
If you're still getting this error message while using the WCF Test Client, it's because the client has a separate MaxBufferSize setting.
To correct the issue:
Right-Click on the Config File node at the bottom of the tree
Select Edit with SvcConfigEditor
A list of editable settings will appear, including MaxBufferSize.
Note: Auto-generated proxy clients also set MaxBufferSize to 65536 by default.
Let me know if this helped.
Regards,
Raghu -
How to add byte[] array based Image to the SQL Server without using parameter
how to add byte[] array based Image to the SQL Server without using parameter.I have a column in table with the type image in sql and i want to add image array to the sql image column like below:
I want to add image (RESIM) to the procedur like shown above but sql accepts byte[] RESIMI like System.Drowing. I whant that sql accepts byte [] array like sql image type
not using cmd.ParametersAdd() method
here is Isle() method contentSQL Server binary constants use a hexadecimal format:
https://msdn.microsoft.com/en-us/library/ms179899.aspx
You'll have to build that string from a byte array yourself:
byte[] bytes = ...
StringBuilder builder = new StringBuilder("0x", 2 + bytes.Length * 2);
foreach (var b in bytes)
builder.Append(b.ToString("X2"));
string binhex = builder.ToString();
That said, what you're trying to do - not using parameters - is the wrong thing to do. Not only it is insecure due to the risk of SQL injection but in the case of binary data is also inefficient since these hex strings are larger than the original byte[]
data. -
I'm unable to send more than 4 MB byte array with JDeveloper 10g / OC4J. It seems to croak the OC4J. Is there a JVM setting or something else that I can increase that will fix this?
I'm unable to send more than 4 MB byte array with JDeveloper 10g / OC4J. It seems to croak the OC4J. Is there a JVM setting or something else that I can increase that will fix this?
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