将查询字符串中的2D数组传递给JSP [英] Pass 2D array in querystring to JSP

问题描述

我想在查询字符串中创建一个2D数组并将其传递给JSP.我可以追加字符串，但是找不到追加二维数组的语法.

I would like to create a 2D array in the query string and pass it to JSP. I could append strings, but I couldn't find the syntax to append two dimensional arrays.

示例:

http://localhost:8080/queryWithQueryString?twodArray [0] [0] = storeid& twodArray [0] [1] = 101

http://localhost:8080/queryWithQueryString?twodArray[0][0]=storeid&twodArray[0][1]=101

我该如何实现?

推荐答案

您可以按原样使用它.参数名称将以确切的格式到达字面上. JSP对此没有任何特殊处理(与PHP不同).因此，您需要解析您自己.

You can just use that as-is. The parameter name will arrive literally in exact that form. JSP doesn't have any special treatment for this (unlike for example PHP). So you'd need to parse it yourself.

String[][] twodArray = new String[1][];
twodArray[0] = new String[2];
twodArray[0][0] = request.getParameter("twodArray[0][0]");
twodArray[0][1] = request.getParameter("twodArray[0][1]");

对多个参数名称使用标准的HTTP约定可能会更容易.

It's probably easier to use standard HTTP conventions for multiple parameter names.

http://localhost:8080/queryWithQueryString?twodArray [0] = storeid& twodArray [0] = 101

http://localhost:8080/queryWithQueryString?twodArray[0]=storeid&twodArray[0]=101

使用

String[][] twodArray = new String[1][];
twodArray[0] = request.getParameterValues("twodArray[0]");

使用List<String[]>代替String[][]也可能更容易，因为List可以动态扩展.如果您事先不知道商品数量，这将很有帮助.

It's probably also easier to use a List<String[]> instead of String[][] as a List can be dynamically expanded. This is helpful if you don't know the amount of items beforehand.

List<String[]> twodArray = new ArrayList<String[]>();

for (int i = 0; i < Integer.MAX_VALUE; i++) {
    String[] values = request.getParameterValues("twodArray[" + i + "]");
    if (values == null) break;
    twodArray.add(values);
}

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