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ios - json NSJSONSerialization 无法加载，因为数据是 html

转载 作者：行者123 更新时间：2023-11-29 01:28:45 27 4
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我得到以下 _downloadedData:

<!-- pageok -->
<!-- managed by puppet -->
<html>
<pre>pageok</pre>
</html>

使用下面列出的代码时:

- (void)downloadItems
{
    //Download the json file
    NSURL *jsonFileUrl = [NSURL URLWithString:@"http://www.scratchclass.com:80/videos/"];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:jsonFileUrl];
    [request setHTTPMethod:@"GET"];
    [request setValue:@"text/html" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"gzip" forHTTPHeaderField:@"Content-Encoding"];
    NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
    if(!connection){
        NSLog(@"Connection Failed");
    }

}


#pragma mark NSURLConnectionDataProtocol Methods

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"didReceiveResponse: %@",response);
    // Initialize the data object
    _downloadedData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    // Append the newly downloaded data
    [_downloadedData appendData:data];

    NSString* newStr = [[NSString alloc] initWithData:_downloadedData encoding:NSUTF8StringEncoding ];
    NSLog(@"didReceiveData: %@",newStr);
}


- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // Create an array to store the videos
    NSMutableArray *_videos = [[NSMutableArray alloc] init];

    // Parse the JSON that came in
    NSError *error;
    NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_downloadedData options:NSJSONReadingMutableContainers error:&error];
    NSLog(@"Connection failed! Error - %@ %@",
          [error localizedDescription],
          [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);

    // Loop through Json objects, create question objects and add them to our questions array
    for (int i = 0; i < jsonArray.count; i++)
    {
        NSDictionary *jsonElement = jsonArray[i];

        // Create a new video object and set its props to JsonElement properties
        GetVideos1 *testVideo = [[GetVideos1 alloc] init];
        testVideo.IDVideo = jsonElement[@"IDVideo"];
        testVideo.title = jsonElement[@"title"];

        // Add this question to the locations array
        [_videos addObject:testVideo];
    }

    // Ready to notify delegate that data is ready and pass back items
    if (self.delegate)
    {
        [self.delegate itemsDownloaded:_videos];
    }
}

json其实是:

[{"IDVideo":"6Joup252fR0","title":"Top 30 Baseball Plays"},{"IDVideo":"aAy3Sh_RXjc","title":"MLB top plays"},{"IDVideo":"bkiaAGOoLjc","title":"Top 50 most unforgettable ejections"}]

但我无法获取数据，因为它是#text 节点名称的一部分。如何获取数据？

这是使用的 php 代码:

<?php 
// Check connection 
if (mysqli_connect_errno()) { 
echo "Failed to connect to MySQL: " . mysqli_connect_error(); 
} 
// Constructor - open DB connection 
function __construct() { 
$this->db = new mysqli('idirectorySQL.db.9960960.hostedresource.com', 'idirectorySQL', 'iDirectory70!', 'idirectorySQL'); 
$this->db->autocommit(FALSE); 
} 
$con=mysqli_connect('idirectorySQL.db.9960960.hostedresource.com', 'idirectorySQL', 'iDirectory70!', 'idirectorySQL');
// This SQL statement selects ALL from the table 'videos' 
$sql = "SELECT IDVideo,title FROM videos"; 
// Check if there are results 
if ($result = mysqli_query($con, $sql)) { 
// If so, then create a results array and a temporary one 
// to hold the data 
$resultArray = array(); 
$tempArray = array(); 
// Loop through each row in the result set 
while($row = $result->fetch_object()) { 
// Add each row into our results array 
$tempArray = $row; 
array_push($resultArray, $tempArray); 
}
// Close connections 
mysqli_close($con); 
// Finally, encode the array to JSON and output the results 
header('Content-type: application/json'); 
//  echo json_encode($resultArray, JSON_PRETTY_PRINT); 
echo json_encode($resultArray); 
} 
?>

我用过

header('Content-type:application/x-www-form-urlencoded')

但是我还是收到了同样的信息。此外，这是从请求 header 中读取的内容:

Accept text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8

最佳答案

不要在 NSURLRequest 中设置任何自定义参数，GET 无论如何都是默认参数。

由于 NSURLConnection 已弃用，这是使用推荐的 NSURLSession API 的解决方案

NSURL *url = [NSURL URLWithString:@"http://www.scratchclass.com:80/videos/"];
NSURLRequest *request = [NSMutableURLRequest requestWithURL:url];           
[[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * data, NSURLResponse * response, NSError * error) {
    if (error) {
      NSLog(@"Connection failed! Error - %@ %@",
          [error localizedDescription],
          [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
    } else {
      NSError *jsonError;
      NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&jsonError];
      if (jsonError) {
        NSLog(@"NSJSONSerialization failed! Error - %@ %@",
              [jsonError localizedDescription],
              [[jsonError userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
      } else {
        NSMutableArray *videos = [[NSMutableArray alloc] init];
        for (NSDictionary *item in  jsonArray) {
          GetVideos1 *testVideo = [[GetVideos1 alloc] init];
          testVideo.IDVideo = item[@"IDVideo"];
          testVideo.title = item[@"title"];

          // Add this question to the locations array
          [videos addObject:item];
        }
        if (self.delegate) {
          [self.delegate itemsDownloaded:videos];
        }
      }
    }
}] resume];

关于ios - json NSJSONSerialization 无法加载，因为数据是 html，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33716776/

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