使用 HTTP Get 发送数组 [英] Send an Array with an HTTP Get

问题描述

如何使用 HTTP Get 请求发送数组?

How can i send an Array with a HTTP Get request?

我正在使用 GWT 客户端发送请求.

I'm Using GWT client to send the request.

推荐答案

这取决于目标服务器接受什么.对此没有明确的标准.另见 a.o.维基百科:查询字符串:

That depends on what the target server accepts. There is no definitive standard for this. See also a.o. Wikipedia: Query string:

虽然没有明确的标准，但大多数 Web 框架允许将多个值与单个字段相关联(例如 field1=value1&field1=value2&field2=value3).^[4][5]

While there is no definitive standard, most web frameworks allow multiple values to be associated with a single field (e.g. field1=value1&field1=value2&field2=value3).^[4][5]

通常，当目标服务器使用强类型编程语言如 Java (Servlet)，然后您可以将它们作为具有相同名称的多个参数发送.API 通常会提供专门的方法来获取多个参数值作为数组.

Generally, when the target server uses a strong typed programming language like Java (Servlet), then you can just send them as multiple parameters with the same name. The API usually offers a dedicated method to obtain multiple parameter values as an array.

foo=value1&foo=value2&foo=value3

String[] foo = request.getParameterValues("foo"); // [value1, value2, value3]

request.getParameter("foo") 也可以处理它，但它只会返回第一个值.

The request.getParameter("foo") will also work on it, but it'll return only the first value.

String foo = request.getParameter("foo"); // value1

并且，当目标服务器使用弱类型语言如 PHP 或 RoR 时，您需要在参数名称后加上大括号 [] 以触发返回值数组而不是单个值的语言.

And, when the target server uses a weak typed language like PHP or RoR, then you need to suffix the parameter name with braces [] in order to trigger the language to return an array of values instead of a single value.

foo[]=value1&foo[]=value2&foo[]=value3

$foo = $_GET["foo"]; // [value1, value2, value3]
echo is_array($foo); // true

如果您仍然使用 foo=value1&foo=value2&foo=value3，那么它只会返回第一个值.

In case you still use foo=value1&foo=value2&foo=value3, then it'll return only the first value.

$foo = $_GET["foo"]; // value1
echo is_array($foo); // false

请注意，当您将 foo[]=value1&foo[]=value2&foo[]=value3 发送到 Java Servlet 时，您仍然可以获得它们，但是您需要使用包括大括号在内的确切参数名称.

Do note that when you send foo[]=value1&foo[]=value2&foo[]=value3 to a Java Servlet, then you can still obtain them, but you'd need to use the exact parameter name including the braces.

String[] foo = request.getParameterValues("foo[]"); // [value1, value2, value3]

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