在 primefaces DataTable 中显示 Hashmap 键和值 [英] Displaying Hashmap keys and values in a primefaces DataTable

问题描述

我正在尝试在 DataTable 中显示 Hashmap，这就是我正在尝试做的事情:我将有一些产品的选择菜单，以及数量的输入文本，一个ajaxified"添加按钮添加产品及其数量到地图，以及一个提交按钮，该按钮显示一个包含数据表的摘要对话框，其中包含两列:产品名称和数量.我的哈希图是

I'm trying to display a Hashmap in a DataTable, here's what i'm trying to do : I'll have a select menu of some products, and an input text for quantity, an "ajaxified" add button that adds the product and its quantity to the map, and a submit button that displays a summary dialog containing a DataTable with two columns : Product Name and Quantitiy. my Hashmap is

Map<Product,Integer> myMap = new HashMap<Product,Integer>();

对于 ajaxified 按钮和所有这些第一步，它们正在为我工​​作，我已经设置好所有东西并且正确填充了地图，剩下的所有内容都在显示数据.

for the ajaxified button and all those first steps, they're working for me, i have everything set and the map filled correctly all what's left is showing the data.

提前致谢.

推荐答案

你这样创建类:

public class Product{
    private int id;
    private String productName;
    private int quantitiy;

    // add getters setters here
}

// add product id to map key
Map<Integer,Product> myMap = new HashMap<Integer,Product>();

public Map<Integer,Product> getProductMap() {
   return myMap;
}


public List<Product> getProducts() {
   return new ArrayList<Product>(myMap.values()_;
}

将数据表值添加到 getProducts() 列表

Add datatable value to getProducts() List

否则，产品作为映射键，

Otherwise, product as a map key then,

Map<Product,Integer> myMap = new HashMap<Product,Integer>();

public List<Map.Entry<Product, Integer>> getProducts() {
    Set<Map.Entry<Product, Integer>> productSet = 
                     myMap.entrySet();
    return new ArrayList<Map.Entry<Product, Integer>>(productSet);
}

这样写primeface页面，

write primeface page like this way,

<p:dataTable value="#{productBean.products}" var="productEntry">
   <p:column>
      <h:outputText value="#{productEntry.key.productName}" />
   </p:column>
   <p:column>
       <h:outputText value="#{productEntry.value}" />
   </p:column>
</p:dataTable>

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