Grails JSON最大长度 [英] Grails JSON max length

问题描述

我知道JSON字符串通常在PHP上的Apache中定义了一个最大长度，但是在Grails中使用TomCat定义的JSON字符串的最大长度是多少？

我发送的JSON字符串长度为13,636个字符，但我可以缩短很多（尽管我不想在测试时） - 也是，我们将来可能会通过JSON发送图片，这些图片需要base64编码，因此会产生相当大的开销。如果我们要做这样的事情，那么我担心如果这个限制造成了问题，那么我们现在应该克服这个问题。

如果没有限制，那么也许我做错了什么。我使用 domainInstance作为grails.converters.deep.JSON 编码为JSON的有限数量的域对象 - 这是使用完成的循环，每当JSON字符串附加到 StringBuilder

时，在视图中使用 render（stringBuilder.toString（））的StringBuilder，并且第一个JSON字符串很好，但是第二个JSON字符串被截断到接近尾声。如果我对此感到不解，我会说我已经获得了StringBuilder总长度的80％左右。

编辑/解决方案：道歉伙计&女孩，我注意到，当我在页面上查看源代码时，我得到完整的JSON字符串，但是当我查看页面时，它被截断。这是一个奇怪的错误，但我会接受为什么它被截断的答案。感谢。

解决方案 是Tomcat中POST请求的最大大小，您可能会担心以后如果你开始发送巨大的JSON / Base64映像请求（就像你提到的那样）。

在tomcat中的默认值是2,097,152字节（2 MB）;它可以通过在server.xml中设置< Connector> 的 maxPostSize 属性进行更改。

来自文档（对于Tomcat 7中的 maxPostSize ）：

lockquote

最大字节数POST将由
容器FORM URL参数解析处理。限制可以通过
禁用，将此属性设置为小于或等于0的值。如果未指定
，则此属性设置为2097152（2兆字节）。

如果您将Grails战争部署到独立的Tomcat实例，则配置非常简单。不过，如果您使用tomcat 插件。如果是我，我可能会使用war而不是grails run-app来运行大文件测试。

I am aware that JSON strings often have a max length defined in either Apache on PHP, however where is the max length for JSON strings defined in Grails using TomCat?

The JSON string I am sending is 13,636 characters in length, however I can shorten it a lot (although I don't want to while we're testing) - also, we may be sending images via JSON in the future which I've read requires base64 encoding and thus a considerable overhead. If we were to do such a thing then I am worried that if this limit is causing problems, it's something we should overcome now.

If there is no limit, then perhaps I am doing something wrong. I have a finite amount of domain objects that I am encoding as JSON using domainInstance as grails.converters.deep.JSON - this is done using a for loop and each time the JSON string is appended to a StringBuilder

I then render the StringBuilder in a view using render(stringBuilder.toString()) and the first JSON string is fine, however the second is truncated near to the end. If I were to guestimate I'd say I am getting around 80% of the total length of the StringBuilder.

EDIT/SOLUTION: Apologies guys & girls, I've noticed that when I view source on the page I get the complete JSON string, however when I just view the page it's truncated. It's an odd error, I'll accept answers on why it's truncated, though. Thanks.

解决方案

There is a maximum size in Tomcat for POST requests, which you may be concerned with later if you start sending huge JSON / Base64 image requests (like you mentioned).

The default value in tomcat is 2,097,152 bytes (2 MB); it can be changed by setting the maxPostSize attribute of the <Connector> in server.xml.

From the docs (for maxPostSize in Tomcat 7):

The maximum size in bytes of the POST which will be handled by the container FORM URL parameter parsing. The limit can be disabled by setting this attribute to a value less than or equal to 0. If not specified, this attribute is set to 2097152 (2 megabytes).

This is pretty straightforward to configure if you're deploying a Grails war to a standalone Tomcat instance. However, I can't find much about actually configuring server.xml if you're using the tomcat plugin. If it were me, I'd probably just run large-file tests using the war instead of with grails run-app.

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