Question

当我想将json发布到Web服务器时，它会崩溃并显示：

Warning, status code of response was not 200, it was 400
2014-03-20 01:15:54.407 iBeacons[6669:60b] error parsing JSON response: Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x156b6440 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

2014-03-20 01：15：54.408 iBeacons [6669：60b] returnString：

400必需字符串参数'beaconsMapping'不存在必需字符串参数'beaconsMapping'不存在

    if ([NSJSONSerialization isValidJSONObject:sendData]) 
    {
    NSError *error;
    NSLog(@"1");
    NSData *jsonData=[NSJSONSerialization 
    dataWithJSONObject:sendData options:
    NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&error];
    NSLog(@"2");
    NSString *json=[[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
    NSLog(@"%@",json);
    NSString *reqData=[@"beaconsMapping=" stringByAppendingString:json];
    NSLog(@"%@",reqData);
    NSData *postDatas=[NSData dataWithBytes:[reqData UTF8String] length:[reqData length]];
    NSString *postLength=[NSString stringWithFormat:@"%d",[postDatas length]];
    NSMutableURLRequest *requestPost=[NSMutableURLRequest requestWithURL:dataUrl cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];
    NSLog(@"%@",dataUrl);
    [requestPost setHTTPMethod:@"POST"];
    [requestPost setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [requestPost setValue:@"application/json"forHTTPHeaderField:@"Accept"];
    [requestPost setValue:@"application/json"forHTTPHeaderField:@"Content-Type"];
    [requestPost setHTTPBody:postDatas];

    NSError *requestError=nil;
    NSURLResponse *response = nil;
    NSData *data=[NSURLConnection sendSynchronousRequest:requestPost returningResponse:&response error:&requestError];
    if (requestError == nil) {
        if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
            NSInteger statusCode = [(NSHTTPURLResponse *)response statusCode];
            if (statusCode != 200) {
                NSLog(@"Warning, status code of response was not 200, it was %d", statusCode);
            }
        }

        NSError *error;
        NSDictionary *returnDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
        if (returnDictionary) {
            NSLog(@"returnDictionary=%@", returnDictionary);
        } else {
            NSLog(@"error parsing JSON response: %@", error);

            NSString *returnString = [[NSString alloc] initWithBytes:[data bytes] length:[data length] encoding:NSUTF8StringEncoding];
            NSLog(@"returnString: %@", returnString);
        }
    } else {
        NSLog(@"NSURLConnection sendSynchronousRequest error: %@", requestError);
    }


}

//我的json输出：

beaconMapping=[
    {
        "floorplanId": "mcc",
        "id": "mcc.b",
        "beaconIds": [
            {
                "distance": "3.873",
                "beaconId": "identityId:Major: 44643, Minor: 29271 x:23.6 y:-21.3 z:-50.2"
            }
        ],
        "locationId": "b"
    }
]//thewebserverrequirestheformatlikethat
 [
    {
        "floorplanId": "mcc",
        "locationId": "c",
        "id": "mcc.c",
        "beaconIds": [

        ]
    },
    {
        "floorplanId": "mcc",
        "locationId": "b",
        "id": "mcc.b",
        "beaconIds": [
            {
                "beaconId": "identityId:Major: 44643, Minor: 29271 x:58.0 y:124.6 z:-360.3",
                "distance": "3.202"
            }
        ]
    },
    {
        "floorplanId": "mcc",
        "locationId": "a",
        "id": "mcc.a",
        "beaconIds": [

        ]
    }
]

//我的websever邮政编码：

    @RequestMapping(value = "/beacons/{floorplanId}", method = RequestMethod.POST)
public @ResponseBody
Set<BeaconsAtFloorplanLocation> setBeacons(
        @PathVariable("floorplanId") String floorplanId,
        @RequestParam("beaconsMapping") String beaconMappingJson)
        throws Exception {

    Set<BeaconsAtFloorplanLocation> beacons = (new MCCObjectMapper())
            .readValue(beaconMappingJson,
                    new TypeReference<Set<BeaconsAtFloorplanLocation>>() {
                    });

    beaconsLoader_.setBeaconMapping(floorplanId, beacons);

    return beacons;
}

Answer 1

尝试删除

Content-Length

Accept

和

Content-Type

来自您的代码。它可能会帮助你。我和json WCF有同样的问题，虽然我的json对象是有效的json。我从代码中删除了所有这3个并且它有效。服务器不接受这些。我不知道为什么..

干杯

Answer 2

在编码json时，你没有提供正确的格式数据。

您使用的是json序列化吗？

在执行此操作之前，尝试使用NSLog查看数据是否正确，创建NSError *错误并将其放入json编码中以检查在为Web服务器发布之前发生了什么。

Answer 3

我已经解决了这个问题，删除

[requestPost setValue:@"application/json"forHTTPHeaderField:@"Accept"];
[requestPost setValue:@"application/json"forHTTPHeaderField:@"Content-Type"];

它会起作用。

Answer 4

如果您已在设备上连接到VPN，则可能会遇到此问题。

解析JSON响应时出错Cocoa错误3840

4 个答案: