我正在尝试用Java编写服务器并使用iPhone应用程序(Objective C)与它进行通信。连接通过,我可以将数据写入服务器,但我无法从服务器读取数据。我收到一条通知,告知有数据需要读取,但它是空的。
Java代码主要来自an Oracle example。
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String inputLine;
out.println("Hello World");
while ((inputLine = in.readLine()) != null) {
System.out.println(inputLine);
System.out.flush();
out.println("test");
if (inputLine.equals("Bye")) {
break;
}
}
out.close();
in.close();
socket.close();
Objective C客户端:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
[[UIApplication sharedApplication] setKeepAliveTimeout:600 handler:^(void) {
NSLog(@"staying alive!");
[[DABMultitaskingController sharedInstance] startTask];
}];
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"10.0.1.189", 4444, &readStream, &writeStream);
NSInputStream *inputStream = (NSInputStream *)readStream;
NSOutputStream *outputStream = (NSOutputStream *)writeStream;
[inputStream setDelegate:self];
[outputStream setDelegate:self];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream open];
[outputStream open];
_dataToSend = [[NSData dataWithBytes:"This is a test" length:15] retain];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent
{
switch (streamEvent) {
case NSStreamEventHasBytesAvailable: {
NSLog(@"can read: %@", theStream);
uint8_t *buffer;
NSUInteger length;
[(NSInputStream *)theStream getBuffer:&buffer length:&length];
NSData *data = [NSData dataWithBytes:buffer length:length];
NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"bytes: %@", data);
NSLog(@"string: %@", string);
break;
}
case NSStreamEventHasSpaceAvailable: {
NSLog(@"can write: %@", theStream);
if (_dataToSend != nil) {
NSLog(@"write: %@", _dataToSend);
[(NSOutputStream *)theStream write:[_dataToSend bytes] maxLength:[_dataToSend length]];
[_dataToSend release];
_dataToSend = nil;
}
break;
}
case NSStreamEventOpenCompleted: {
NSLog(@"open complete: %@", theStream);
break;
}
case NSStreamEventErrorOccurred: {
NSLog(@"error occurred: %@", theStream);
break;
}
case NSStreamEventEndEncountered: {
NSLog(@"end encountered: %@", theStream);
break;
}
default:
break;
}
}
答案 0 :(得分:1)
你永远不会向java方面发送换行符\ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n>它们作为readLine();
_dataToSend = [[NSData dataWithBytes:"This is a test\n" length:16] retain];
答案 1 :(得分:0)
看起来我需要使用read:maxLength:
代替。现在工作正常。