Ios 解析JSON响应时出错，错误3840

当我想将json发布到web服务器时，它将崩溃并显示：

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]返回字符串：

400所需字符串参数“beaconsMapping”不存在所需字符串参数“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": [

        ]
    }
]

//我的网页邮编：

    @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;
}

@RequestMapping（value=“/beacons/{floorplanId}”，method=RequestMethod.POST）
公共@ResponseBody
设置挫折(
@PathVariable（“floorplanId”）字符串floorplanId，
@RequestParam（“BeaconMapping”）字符串beaconMappingJson）
抛出异常{
设置信标=（新的McObjectMapper（））
.readValue（beaconMappingJson，
新类型引用（）{
});
信标加载器。设置信标映射（楼层平面ID，信标）；
返回信标；
}

在编码json时，您可能没有提供正确的格式数据

您正在使用json序列化吗

---

尝试使用NSLog查看数据是否正确，然后再创建一个NSError*错误，并将其放入json编码中，以检查发生了什么，然后再将其发布到Web服务器

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"];

它会起作用的

尝试删除

Content-Length

Accept

及

从你的代码。这可能对你有帮助。 虽然我的json对象是有效的json，但json WCF也有同样的问题。 我从代码中删除了所有这3个元素，它成功了。服务器没有接受这些。 我不知道为什么

---

干杯

如果您连接到设备上的VPN，您可能会遇到此问题

发布您的相关代码可能是json编码发现了问题。我添加了代码，请查看，thanksbeaconMapping=equal符号在json格式中无效，但我的http帖子需要一个名为beaconMapping的参数来接收发送的数据，我应该如何处理它。我已经在上面发送了java web服务器代码是的，当输出数据看起来正确时，我发布了我的代码和json格式，你能帮我再次检查一下吗？谢谢

Content-Type