JSF的viewAction傳遞PARAM連帶設置，但返回空

Question

JSF 2.2
Primefaces 4.0
JBoss的Wildfly

從網頁與客戶的名單，並希望爲每一位客戶，用戶可以一鍵添加項目。 當我點擊「新建項目」按鈕時，我被重定向到新的項目頁面。

在URL中的客戶ID

newItem.jsf;jsessionid=Xw7tdljr9f0atzyET2Fy6_WI?customerId=3 

我可以調試，在新項目的bean與值3稱爲組客戶ID的方法，好:)
但之後我調試在獲得客戶ID方法被稱爲..現在的客戶ID爲空:(

而且我做了一個syso：

18：10：25312 INFO [標準輸出（默認任務-9）設置搜索g客戶ID 3

因此，客戶ID是開始設置...但重置爲空以某種方式？

customers.xhtml

<ui:define name="content"> 
<f:metadata> 
    <f:viewParam name="customerId" value="#{customerController.customerEnt.id}" /> 
</f:metadata> 
<h:form id="customers" prependId="false" includeViewParams="true"> 
    <p:dataTable id="dataTable" var="customer" 
     value="#{customerController.customers}" rowKey="#{customer.id}" 
     styleClass="userDataTableStyle" paginator="true" rows="10" 
     selection="#{customerController.selectedCustomers}" 
     paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}" 
     lazy="true" rowsPerPageTemplate="10,15,50"> 
    ... 

     <p:column> 
      <p:commandButton ajax="false" value="New Item" action="#{customerController.newItem(customer)}"/> 
     </p:column> 

    </p:dataTable> 

</h:form> 

newItem.xhtml

<ui:define name="content"> 
<f:metadata> 
    <f:viewParam name="customerId" 
     value="#{newItemController.customerId}" /> 
    <f:viewAction action="#{newItemController.init()}"/> 
</f:metadata> 
<h:form id="item" includeViewParams="true"> 
... 

newItemController.java

@SuppressWarnings("serial") 
@ViewScoped 
@Named 
public class NewItemController implements Serializable { 

    private CustomerEnt customerEnt; 
    private String customerId; 

    @PostConstruct 
    public void init() { 
     itemEnt = new ItemEnt(); 

     if (customerId == null) { 
      String message = "Bad request. Please use a link from within the system."; 
      FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, message, null)); 
      return; 
     } 

     customerEnt = customerDas.find(Long.parseLong(customerId)); 

     if (customerEnt == null) { 
      String message = "Bad request. Unknown customer."; 
      FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, message, null)); 
     } 
    } 

    public String getCustomerId() { 
     return customerId; 
    } 

    public void setCustomerId(String customerId) { 
     this.customerId = customerId; 
     System.out.println("Setting customer id " + customerId); 
    } 
} 

CustomerController.java

@SuppressWarnings("serial") 
@SessionScoped 
@Named 
public class CustomerController implements Serializable { 

    private Long customerId; 

    public String newItem(CustomerEnt customerEnt) { 
     customerId = customerEnt.getId(); 
     return "newItem?faces-redirect=true&customerId=" + customerId; 
    } 

由於L-雷表示，在init叫了兩次，所以我做的NewItemController這種變化：

 public void init() { 
      System.out.println("In init"); 
     } 

     @PostConstruct 
     public void postConstruct() { 
      itemEnt = new ItemEnt(); 
      System.out.println("In postConstruct"); 

     } 

    public void loadData() { 
      if (customerId == null) { 
       String message = "Bad request. Please use a link from within the system."; 
       FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, message, null)); 
       return; 
      } 
     } 


public void save() throws Exception { 
     try { 
      serviceSLSB.save(Long.parseLong(customerId), itemEnt); 
      FacesMessage m = new FacesMessage(FacesMessage.SEVERITY_INFO, "Saved!", "Item saved successful"); 
      facesContext.addMessage(null, m); 
      postConstruct(); 
     } catch (ConstraintViolationException e) { 
      itemEnt.setBid(null); 
      String errorMessage = getRootErrorMessage(e); 
      FacesMessage m = new FacesMessage(FacesMessage.SEVERITY_ERROR, errorMessage, "Saving unsuccessful"); 
      facesContext.addMessage(null, m); 
     } catch (Exception e) { 
      String errorMessage = getRootErrorMessage(e); 
      FacesMessage m = new FacesMessage(FacesMessage.SEVERITY_ERROR, errorMessage, "Saving unsuccessful"); 
      facesContext.addMessage(null, m); 
     } 
    } 

，並在newItem.xhtml

<f:metadata> 
       <f:viewParam name="customerId" 
        value="#{newItemController.customerId}" /> 
       <f:viewAction action="#{newItemController.loadData()}"/> 
      </f:metadata> 

而現在它的工作原理...： ）但現在我有一個新的問題..我會爲此創建一個單獨的問題:) 感謝您的幫助

Answer 1

給定的來源看起來不錯 - 只有一件事情捕捉到我的眼睛：目前，您的NewItemController.init （）get兩次被調用

• 作爲@PostConstruct
• 到f：的viewAction

如果你無論如何調用該方法，你不需要註釋，是不是？

Answer 2

我永遠不會明白f:viewParam ...也許你錯過includeViewParams=true在CustomerController.newItem()？從未在表單上看到，也許是JSF 2。2

我這樣做是這樣的：

@ViewScoped 
@Named 
public class NewItemController implements Serializable 
{ 
    private CustomerEnt customerEnt; 

    @ManagedProperty("#{param.customerId}") 
    private String customerId; 

    @PostConstruct 
    public void init() 
    { 
     if(customerId == null) 
     { 
      String message = "Bad request. Please use a link from within the system."; 
      FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, message, null)); 
      return; 
     } 

     customerEnt = customerDas.find(Long.parseLong(customerId)); 

     if(customerEnt == null) 
     { 
      String message = "Bad request. Unknown customer."; 
      FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, message, null)); 
     } 
    } 

    public String getCustomerId() 
    { 
     return customerId; 
    } 

    public void setCustomerId(String customerId) 
    { 
     this.customerId = customerId; 
     System.out.println("Setting customer id " + customerId); 
    } 
} 

和newItem.xhtml

<ui:define name="content"> 
    <!-- 
    <f:metadata> 
     <f:viewParam name="customerId" 
      value="#{newItemController.customerId}" /> 
     <f:viewAction action="#{newItemController.init()}"/> 
    </f:metadata> 
    --> 

    <h:form id="item"> 
    ... 
</ui:define>