java 是否可以在jstl中使用foreach同时迭代两个项目？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/4142631/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
is it possible to iterate two items simultaneously using foreach in jstl?
提问by randy
I have two items from my model and I want to iterate them at the same using jstl foreach. how can I achieve this using a correct syntax?
我的模型中有两个项目，我想使用 jstl foreach 同时迭代它们。如何使用正确的语法实现这一点？
回答by dogbane
You can call varStatus.indexto get the index of the current round of iteration, and then use it as a lookup for the second list.
可以调用varStatus.index获取本轮迭代的索引，然后作为第二个列表的查找。
For example, if you have two lists people.firstnamesand people.lastnamesyou can do:
例如，如果您有两个列表people.firstnames并且people.lastnames可以执行以下操作：
<c:forEach var="p" items="${people.firstnames}" varStatus="status">
<tr>
<td>${p}</td>
<td>${people.lastnames[status.index]}</td>
</tr>
</c:forEach>
回答by Boris Pavlovi?
I assume you have to collections that you want to iterate in one go. Add a getter which will merge these two collections and use it for the iteration. For example
我假设你必须要一次性迭代的集合。添加一个 getter，它将合并这两个集合并将其用于迭代。例如
private Collection<String> first;
private Collection<String> second;
public Collection<String> getBoth()
{
List<String> result = new ArrayList<String>();
result.addAll(first);
result.addAll(second);
return result;
}
Iteration in JSTL:
JSTL 中的迭代：
<c:forEach var="p" items="${people.both}">
<tr>
<td>${p}</td>
</tr>
</c:forEach>
