Iterate over a List of Maps using s:iterator

前端未结

关注

 1  1871

北海茫月 2021-02-03 13:09

I\'m trying to iterate through a List of Maps using s:iterator. I can iterate through the List without problems, but I can not get it to iterate through the entries of the map.

1条回答

长发绾君心 (楼主)

2021-02-03 13:26

Here is a demo that loops through lists of map:

import com.opensymphony.xwork2.ActionSupport;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class mapTest extends ActionSupport {
  public List listmap;

  public String execute(){
    listmap = new ArrayList();
    Map map = new HashMap();
    map.put("a", "alpha");
    map.put("b", "bravo");
    map.put("c", "charlie");
    listmap.add(map);
    Map map2 = new HashMap();
    map2.put("d", "delta");
    map2.put("e", "echo");
    map2.put("f", "foxtrot");
    listmap.add(map2);
    return SUCCESS;
  }
}

Here is the JSP to render it:

<%@taglib prefix="s" uri="/struts-tags"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>


    
        Map Test
        
                    
                        
            
                
                    List #
                    key
                    value

Note the inner iterator is context sensitive it will use the last value pushed onto the stack. The status attribute gives us a IteratorStatus object each iteration which is useful if we want to know the current iteration.

0 讨论(0)