如何使用Struts2中的迭代器从linkedhashmap中检索值......？ [英] How to retrieve value from linkedhashmap using iterators in Struts2......?

问题描述

我有在Struts2中返回LinkedHashMap的函数，我刚才知道我们不能在struts2中使用for循环，而是我们必须使用Iterators，并且是struts的新手

I have function which return LinkedHashMap in Struts2 and i just came to know that we cannot use for loop in struts2 instead we have to use Iterators, and am new to struts

可以帮助我使用迭代器从linkedhashmap中检索值，下面是如何在hashmap中排列值：

can any on help me to retrieve value from linkedhashmap using iterators, below is how values are lined up in hashmap:

 LinkedHashMap<String, ArrayList<String>> topSuppliers = new LinkedHashMap<String, ArrayList<String>>();

    while(resultset.next()){

    ArrayList<String> innerList = new ArrayList<String>();

    String manufId = resultset.getString("manufacturer_id");
    String manufLogo = resultset.getString("SUPPLIER_LOGO_IMAGE");
    String manufName = resultset.getString("MANUFACTURER_NAME");
    String manufURL = resultset.getString("MANUFACTURER_URL");

     innerList.add(manufId);
     innerList.add(manufLogo);
     innerList.add(manufName);
     innerList.add(manufURL);

     topSuppliers.put(manufName,innerList);
    }
return topSuppliers;

我想在一组4家制造商中展示它们：

And i want to display them in a set of 4 manufacturers:

Set1:  1,2,3,4
Set2:  5,6,7,8
Set3:  9,10,11,12
etc......

谢谢....... 。

Thank you........

推荐答案

你应该迭代地图列表而不是列表地图

---

示例：

@Getter
private List<Map> listOfMap = Lists.newArrayList();

public String execute() {

    while (resultset.next()) {
        final Map<String, String> map = Maps.newHashMap();

        map.put("manufId", resultset.getString("manufacturer_id"));
        map.put("manufLogo", resultset.getString("SUPPLIER_LOGO_IMAGE"));
        map.put("manufName", resultset.getString("MANUFACTURER_NAME"));
        map.put("manufURL", resultset.getString("MANUFACTURER_URL"));

        listOfMap.add(map);
    }

    return SUCCESS;
}

<s:iterator value="listOfMap">
  ${manufId}
  ${manufLogo}
  ${manufName}
  ${manufURL}
</s:iterator>

listOfMap 也可以用作 dataSource rel =nofollow> Struts2 JasperReports插件 。

The listOfMap also can use as a dataSource for Struts2 JasperReports Plugin.

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