Question

使用jquery，我可以使用像这样的ajax将json对象从客户端发送到服务器：

var strJSON = '{"event":[{
    "dates":[
        "2009-10-14","2009-10-15"],
   "teams":[
        {"id":"0","country":"USA","state":"CA","name":"California Polytechnic State University","subteam":""},
        {"id":"1","country":"USA","state":"CA","name":"California State University, Bakersfield","subteam":""},
        {"id":"2","country":"USA","state":"CA","name":"California State University, Fresno","subteam":""},
        {"id":"3","country":"USA","state":"CA","name":"California State University, Fullerton","subteam":""}]
}]}';

$.ajax({
    url: '../ajax/save_event',
    type: 'POST',
    data: { data : strJSON },
    dataType: 'json',
    timeout: 8000,
    cache: false
});

效果很好。但是如果JSON字符串变得更大（不确定确切的大小，但大约大5倍），服务器收到的$ _POST数据为空。有谁知道为什么？

我正在使用Apache / PHP / jquery。它发生在IE和Firefox上。我需要调整配置设置吗？

以下是无法通过的字符串示例：

{"events":[{"dates":["2009-10-10","2009-10-11","2009-10-12"],"divisions":[{"level":"Collegiate","name":"Varsity","subdivision":"Division I","rounds":[],"teams":[{"id":"0","country":"USA","state":"CA","name":"California Polytechnic State University","subteam":""},{"id":"1","country":"USA","state":"CA","name":"California State University, Bakersfield","subteam":""},{"id":"2","country":"USA","state":"CA","name":"California State University, Fresno","subteam":""},{"id":"3","country":"USA","state":"CA","name":"California State University, Fullerton","subteam":""},{"id":"4","country":"USA","state":"CA","name":"Stanford University","subteam":""},{"id":"5","country":"USA","state":"CA","name":"University of California, Davis","subteam":""},{"id":"6","country":"USA","state":"CA","name":"San Francisco State University","subteam":""},{"id":"7","country":"USA","state":"CA","name":"Lassen Community College","subteam":""},{"id":"8","country":"USA","state":"CA","name":"Menlo College","subteam":""},{"id":"9","country":"USA","state":"CA","name":"Fresno Pacific University","subteam":""},{"id":"10","country":"USA","state":"CA","name":"Bakersfield","subteam":""},{"id":"11","country":"USA","state":"CA","name":"Buchanan","subteam":""},{"id":"12","country":"USA","state":"CA","name":"Campolindo-Moraga","subteam":""},{"id":"13","country":"USA","state":"CA","name":"Fremont-Sunnyvale","subteam":""},{"id":"14","country":"USA","state":"CA","name":"Ponderosa-Shingle Springs","subteam":""},{"id":"15","country":"USA","state":"CA","name":"West Covina","subteam":""},{"id":"16","country":"USA","state":"CA","name":"Gilroy","subteam":""},{"id":"17","country":"USA","state":"CA","name":"San José State University","subteam":""},{"id":"18","country":"USA","state":"CA","name":"University of California, Los Angeles","subteam":""},{"id":"19","country":"USA","state":"CA","name":"Sierra College","subteam":""},{"id":"20","country":"USA","state":"CA","name":"Selma","subteam":""},{"id":"21","country":"USA","state":"CA","name":"Liberty","subteam":""}],}]}]}

它是使用json.org的“stringify”创建的：

var strJSON = JSON.stringify(oEvent);

修改进一步调查，我将dataType更改为“text”并尝试发送一长串数字。它工作直到~3500个字符然后扼流圈（当我说“扼流圈”时，我的意思是请求到达服务器时带有$ _POST空。）

我的PHP post_max_size是64M，所以不是这样。有人建议使用Apache的“LimitRequestBody”，它不在httpd.conf中，所以我在其中添加了“LimitRequestBody 0”并重新启动了Apache。这也没有帮助。

还有其他建议???

Answer 1

这可能是由于您的服务器配置造成的。检查php.ini中的设置max_post_size并确保它足够大以发布您的数据。还要检查您的Web服务器设置--Apache有LimitRequestBody指令可能导致您的问题。最后，检查您的Web服务器和PHP错误日志，以查看大帖子是否触发任何错误。

Answer 2

只有几个指向找到此页面的其他人的指针 - 我遇到了类似的问题，JSON字符串无法使用jQuery.parseJSON()进行解析。

我很尴尬地说我的问题（可能与OP的问题无关）实际上是由一个流浪的单引号引起的。逃避它解决了这个问题。我原本认为它与字符串长度有关，因为它似乎只发生了一个长度为8,000字符的JSON字符串，但它是在错误的地方终止字符串的流浪引用。

蒂姆，我不知道你是否曾触及原始问题的底部，但是粘贴了你提供的字符串：

{"events":[{"dates":["2009-10-10","2009-10-11","2009-10-12"],"divisions":[{"level":"Collegiate","name":"Varsity","subdivision":"Division I","rounds":[],"teams":[{"id":"0","country":"USA","state":"CA","name":"California Polytechnic State University","subteam":""},{"id":"1","country":"USA","state":"CA","name":"California State University, Bakersfield","subteam":""},{"id":"2","country":"USA","state":"CA","name":"California State University, Fresno","subteam":""},{"id":"3","country":"USA","state":"CA","name":"California State University, Fullerton","subteam":""},{"id":"4","country":"USA","state":"CA","name":"Stanford University","subteam":""},{"id":"5","country":"USA","state":"CA","name":"University of California, Davis","subteam":""},{"id":"6","country":"USA","state":"CA","name":"San Francisco State University","subteam":""},{"id":"7","country":"USA","state":"CA","name":"Lassen Community College","subteam":""},{"id":"8","country":"USA","state":"CA","name":"Menlo College","subteam":""},{"id":"9","country":"USA","state":"CA","name":"Fresno Pacific University","subteam":""},{"id":"10","country":"USA","state":"CA","name":"Bakersfield","subteam":""},{"id":"11","country":"USA","state":"CA","name":"Buchanan","subteam":""},{"id":"12","country":"USA","state":"CA","name":"Campolindo-Moraga","subteam":""},{"id":"13","country":"USA","state":"CA","name":"Fremont-Sunnyvale","subteam":""},{"id":"14","country":"USA","state":"CA","name":"Ponderosa-Shingle Springs","subteam":""},{"id":"15","country":"USA","state":"CA","name":"West Covina","subteam":""},{"id":"16","country":"USA","state":"CA","name":"Gilroy","subteam":""},{"id":"17","country":"USA","state":"CA","name":"San José State University","subteam":""},{"id":"18","country":"USA","state":"CA","name":"University of California, Los Angeles","subteam":""},{"id":"19","country":"USA","state":"CA","name":"Sierra College","subteam":""},{"id":"20","country":"USA","state":"CA","name":"Selma","subteam":""},{"id":"21","country":"USA","state":"CA","name":"Liberty","subteam":""}],}]}]}

进入http://json.parser.online.fr/会出现以下错误，如果这对任何其他人有任何帮助：

<强> SyntaxError: JSON.parse: expected double-quoted property name

Answer 3

似乎存在一个大小问题，当测试我的Json字符串时，当字符串很小时一切正常，当我增加字符串（要编码的php数组）时，Json字符串的输出会被切断。

在失败的字符串上执行字符串长度时，我得到（7796）。所以我将ini文件中的max post选项更改为cli和apache为64M而不是8M，我仍然遇到同样的问题。我不认为这个问题仅限于apache LimitRequestBody，因为php在CLI上提供了相同的输出。

还有一件事，当对编码的json字符串执行var_dump时，我可以看到它被切断并且json标记没有被关闭，因此Json解码器返回null的原因。

例如

$strJson = file_get_contents('http://mydomain/page');
var_dump($strJson);

您将看到字符串被切断的位置，并且零连接到输出的末尾。

Answer 4

'jsonp'数据类型不能也不能使用POST方法。而是所有数据都在查询字符串中传递。因此，如果超出服务器的最大查询字符串长度，则不会传递数据。原因是jQuery将json数据作为节点加载到html文档中，这只能作为GET完成。如果您需要更多数据，则必须使用XML或其他。

JSON对象最大大小？

4 个答案: