Java和Objective C之间的套接字连接

我试图用Java编写一个服务器，并使用iPhone应用程序（Objective C）与之通信。连接通过后，我可以向服务器写入数据，但无法从服务器读回数据。我收到一个通知，有数据要读取，但它是空的

Java代码主要取自

目标客户：

- (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;
    }
}

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从未向java端BufferedReader发送换行符\n使用这些作为readLine（）的分隔符

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从未向java端BufferedReader发送换行符\n使用这些作为readLine（）的分隔符

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看起来我需要改为使用

read:maxLength:

。现在工作正常。

看起来我需要使用

读取：maxLength:

。现在工作正常。

没错，但这不是问题的根本原因。

BufferedReader

可以（完全）读取不以行分隔符结尾的数据流。这似乎与只制作自己的缓冲区并使用读取有关。我猜这并没有解决上述问题，但确实使通信更加可靠。这是真的，但不会是问题的根本原因。

BufferedReader

可以（完全）读取不以行分隔符结尾的数据流。似乎只需要制作自己的缓冲区并使用读取，我想这并不能解决上述问题，但它确实使沟通更加可靠。在何处添加此内容，因为它本应编辑您的问题和答案。在何处添加此内容，因为它本应编辑您的问题和答案。

- (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;
    }
}

_dataToSend = [[NSData dataWithBytes:"This is a test\n" length:16] retain];