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

问题描述

我试图在DataTable中显示一个Hashmap，下面是我想要做的事情：我将有一些产品的选择菜单，以及一个用于数量的输入文本，一个ajaxified添加按钮，它添加该产品及其数量，以及一个提交按钮，该按钮显示包含具有两列的DataTable的摘要对话框：Product Name和Quantitiy。
我的Hashmap是

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

为ajaxified按钮和所有这些第一步，他们为我工作，我有一切设置并且地图填写正确，所有剩下的就是显示数据。

预先致谢。

解决方案

  public class Product {
 private int id; 
私人字符串productName; 
 private int quantitiy; 
 
 //在此添加getters setters 
} 
 
 //将产品id添加到map key 
 Map&Integer，Product> myMap = new HashMap< Integer，Product>（）; 
 
 public Map< Integer，Product> getProductMap（）{
 return myMap; 
} 
 
 
公共清单<产品> getProducts（）{
 return new ArrayList< Product>（myMap.values（）_; 
} 
  

将数据表值添加到getProducts（）列表中

否则，产品作为映射键然后，

  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）; 
} 
  

像这样编写primeface页面，

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

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>();

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.

Thanks in advance.

解决方案

You create Class like this:

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()_;
}

Add datatable value to getProducts() List

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);
}

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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