迭代jstl中的多项 [英] iterating of muliple items in jstl

问题描述

我有这个要求在jstl中同时迭代3个以上的列表.遍历我们使用的单个列表

I have this requirement to iterate over 3 lists at the same time in jstl. for iterating over a single list we use

<c:forEach var = "mfgn" items = "${requestScope.mfgNumber}" varStatus = "status">
    do something;   
</c:forEach>

我需要做类似

<c:forEach var = "mfgn" var = "issue" items = "${requestScope.mfgNumber}" items = "${requestScope.something" varStatus = "status">
     mfgNumber;     
</c:forEach>

这是可能的还是通过其他方式同时遍历多个列表.

is this possible or there an otherway to iterate over multiple lists at the same time.

推荐答案

如果它们的大小相同，则有两个选项，假设它们分别为List<Integer>和List<String>:

If they have the same size, then there are two options, assuming that it are List<Integer> and List<String>:

1. 将它们与实体合并到单个列表中，这些实体又将单个列表中的其他列表的项目重复出现，例如List<ManfacturerIssue>，其中ManfacturerIssue是一个Javabean类，其中包含Integer number和String issue特性.这样，您最终可以这样做:

1. Merge them in a single list with entities which in turn repesents the items of each other list in a single class like List<ManfacturerIssue> where the ManfacturerIssue is a javabean class which contains Integer number and String issue properties. This way you can end up doing:

<c:forEach items="${mfgIssues}" var="mfgIssue">
    ${mfgIssue.number}, ${mfgIssue.issue}
</c:forEach>

而是通过索引进行迭代，但这很难看，并且无法通过(填写)来维护:

Iterate by index instead, this is however ugly and unmaintainable as (fill in):

<c:forEach begin="0" end="${fn:length(mfgNumbers) - 1}" varStatus="loop">
    ${mfgNumbers[loop.index]}, ${issues[loop.index]}
</c:forEach>

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