尝试将 JSON 数据发送到服务器，但得到“意外的字符串结尾”

Posted 2023-03-16

【中文标题】尝试将 JSON 数据发送到服务器，但得到“意外的字符串结尾”

【英文标题】：Trying to send JSON data to a server, but getting an "unexpected end of string"

【发布时间】：2013-05-17 04:58:07

【问题描述】：

我正在尝试将数据发送到服务器，但在服务器连接成功时得到响应为空

显示以下错误：-

    "-JSONValue failed. Error trace is: (
         "Error Domain=org.brautaset.JSON.ErrorDomain Code=11 
          \"Unexpected end of string\" UserInfo=0x4b156c0 
          NSLocalizedDescription=Unexpected end of string"
    )"

我的代码是：--

NSString *post = [NSString stringWithFormat:@"
                   \"userDetails\":[
                                    \"username\":\"srj.s%2540xxxxxx.com\" ,
                                    \"password\":\"admin123\",
                                    \"apply_class_id\":\"\"],
                   \"wsfunction\":\"user_authentication\"@"];

//Encode the post string using NSASCIIStringEncoding and also the post string you need to send in NSData format.    
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

//send actual length of your data   
NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];

//Create URLRequest object and initialize it.   
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];


//Set the Url for which your going to send the data to that request.    
[request setURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://xxxxxxxx.xxxxxxxx.com:8080/xxxxxxxx.php"]]];

//set HTTP method (POST or GET).    
[request setHTTPMethod:@"POST"];

//Set HTTP header field with length of the post data.
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

//Also set the Encoded value for HTTP header Field.
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Current-Type"]; 

//Set the HTTPBody of the urlrequest with postData. 
[request setHTTPBody:postData];

//4. Now, create URLConnection object. Initialize it with the URLRequest.   
NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];

//check that whether you URL connection is done properly or not using just if/else statement as below       
 if(conn)
 
    NSLog(@"Connection Successful");
 
 else
 
    NSLog(@"Connection could not be made");
 


- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
    //While receiving the response data
    responseData = [responseData appendData:data];


- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error 
    //When failed just log
    //[delegate hideIndicator];
    NSLog(@"Connection failed!");
    NSLog(@"Error %@", error);


- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
    //When the response data is downloaded 
    // NSLog(@" Data obtained %@", responseData);
    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    // NSLog(@" Response String %@", responseString);
    //converted response json string to a simple NSdictionary
    
    NSMutableArray *results = [responseString JSONValue];
    NSLog(@"Response: %@", results);

【问题讨论】：

请发布您从服务器收到的回复。

NSString *post = [NSString stringWithFormat:@" -- 为什么？ 如果你只有一个常量字符串，为什么要stringWithFormat:？

【参考方案1】：

在你的 *post 变量中，

符号末尾有一个不必要的@符号，请尝试删除它并执行您的代码。

另外对于用户名你有 % 符号，希望不会搞砸...

NSString *post = [NSString stringWithFormat:@"\"userDetails\":[\"username\":\"srj.s%2540xxxxxx.com\" , \"password\":\"admin123\",\"apply_class_id\":\"\"],\"wsfunction\":\"user_authentication\""];