i'v tested to send request like "123" using DataOutputStream
byte[] req = "123".getBytes()
dataOutputStream.writeInt(req.length);
dataOutputStream.write(req);
dataOutputStream.flush();
i tried to send this request 10 times, the server received data like this:
recevieLen=7 [ 0 0 0 3 49 50 51 ]
recevieLen=7 [ 0 0 0 3 49 50 51 ]
recevieLen=7 [ 0 0 0 3 49 50 51 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 3 ]
recevieLen=3 [ 49 50 51 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 3 ]
recevieLen=3 [ 49 50 51 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 3 ]
recevieLen=3 [ 49 50 51 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 0 ]
recevieLen=1 [ 3 ]
recevie=3 [ 49 50 51 ]
......
i'v looked into JDK source code about DataOutputStream:
public final void writeInt(int v) throws IOException {
out.write((v >>> 24) & 0xFF);
out.write((v >>> 16) & 0xFF);
out.write((v >>> 8) & 0xFF);
out.write((v >>> 0) & 0xFF);
incCount(4);
}
it will cal out.write() for every byte, so my server'll recevie length
value 4 times.
why the first 2 or 3 times request will be OK (the server can get the whole
7 bytes), who can gvie me some help to handle this problem, thanks a lot.
======== 2007-05-15 17:08:29： ========
Hi, All
i wanna to use MINA to improve my ApplicationServer, the old application's
socket part is developed using DataInputStream & DataOutputStream in both
server and client side. we wrote data package length at the begining for ervry
request and response data. the code looks like this
// for request
byte [] request = ...
int reqLen = request.length;
dataOutputStream.writeInt(reqLen);
dataOutputStream.write(request);
dataOutputStream.flush();
...
// for response
int resLen = dataInputStream.readInt();
byte[] response = new byte[resLen];
dataInputStream.read(response);
...
i'v tried to use MINA to handle the request sent by my old clients(the
clients have been deployed in many area and CodeChanging is forbidden), because
of the noblocking of NIO, when one client calls writeInt(), write(), flush()
methods orderly, my IoHandler would recevie data partly in many times. so in
IoHandler.messageRecevied(), it couldn't get the whole request data to do the
business logic.
who can give me some advice to handle tihs?
Best Regard!
LJ
2007-05-15
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