MultiValueMap的用法（一个key对应多个value）

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要实现1个key对应多个value,可以用apach提供的MultiValueMap

import org.apache.commons.collections.map.MultiValueMap;import java.util.Collection;public class TestMain{    public static void main(String[] args) throws IOException    {                MultiValueMap mailMap = new MultiValueMap();                 mailMap.put("number", "1");                 mailMap.put("number", "30");                 mailMap.put("name", "wang");                 mailMap.put("card", "12344");                 mailMap.put("card", "65432");                Collection mapcoll = null;                mapcoll = mailMap.getCollection("card");                Iterator ii = mapcoll.iterator();                while(ii.hasNext()){                   String mailValue = (String) ii.next();                   System.out.println(mailValue);                }   }   }

输入结果：

1 1