java以及jstl表达式中对HashMap的迭代

①java

entryset()返回此映射所包含的映射关系的set视图，即key-value的set集合，类型是set<map.entry<k,v>>

hashmap<string, object> map = new hashmap<string, object>();

map.put("001", "xy001");

map.put("002", "xy002");

set<map.entry<string, object>> entryset = map.entryset();

for (map.entry<string, object> entry : entryset)

{

system.out.println(entry.getkey() + "..." + entry.getvalue());

}

②jstl

<c:foreach items="${map}" var="entry">

 ${entry.key}:${entry.value}

</c:foreach>