一、map
后台代码:
-
Map
<String,String> map2 = new HashMap();
-
map2.put("a","hello world");
-
map2.put("b","this is map");
-
request.setAttribute("map2",map2);
前台代码:
-
<c:forEach var="item" items="${map2}">
-
${item.key} > 或者 ${item['a']}
-
${item.value}
<br>
-
</c:forEach>
二、map(Object,map)
后台代码:
-
List
<String> list = new ArrayList
<String>();
-
list.add("first");
-
list.add("second");
-
List
<String> list2 = new ArrayList
<String>();
-
list2.add("aaaaaa");
-
list2.add("bbbbbb");
-
Map
<String,List<String>> map = new HashMap();//(List
<Map(k,v)>同理)
-
map.put("a",list);
-
map.put("b",list2);
-
request.setAttribute("map",map);
前台代码:
-
<c:forEach var="item" items="${map['a']}">
-
${item }
<br>
-
</c:forEach>
<br>
-
<c:forEach var="item" items="${map['b']}">
-
${item }
<br>
-
</c:forEach>
<br>
-
// map中值为列表,直接遍历列表中的每一项
<br>
-
<c:forEach var="item" items="${map}">
-
<c:forEach items="${item.value}" var="it">
-
${it }
<br>
-
</c:forEach>
-
</c:forEach>
三、list
后台代码:
List list=new ArrayList(); list.add(user1); list.add(user2); list.add(user3); request.setAttribute(“list”,list);
user是一个类,里面有set/get方法
前台代码:
-
<c:forEach var="user" items="${list}">
-
<c:out value="${user.username}" />
-
</c:forEach>
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