jsf搜索和结果页面

Question

我有两个页面 - 搜索和结果以及一个bean。如果我使用ViewScoped，我的结果不会显示。如果我使用RequestScoped，我的页面链接不起作用。我该如何解决它？如果我用Viewscoped将提交放入init，一切工作正常，但如果我这样做，我应该如何从窗体中获取变量？

我的豆：

@Named 
@ViewScoped 
public class Result implements Serializable { 

private static final long serialVersionUID = 1L; 
private DAOFactory javabase = DAOFactory.getInstance("javabase.jdbc"); 
private RecipeDAO recipeDAO = javabase.getRecipeDAO(); 
private ResourceBundle messages; 
@Inject 
LocaleBean locale; 
private List<Recipe> recipes; 
private List<Recipe> recipesView; 
private String language; 
private List<Page> pagesArray; 
private Integer currentPage; 

public void init() { 
    System.out.println("Language is: " + language); 
    String language1 = "en"; 
    recipes = new ArrayList<>(); 
    recipes = recipeDAO.searchRecipe(language1); 
    int showValue = 5; //split value 
    int pages = recipes.size()/showValue; //pages value 
    if (recipes.size() % showValue != 0) { 
     pages = pages + 1; 
    } 
    for (int i = 0; i < recipes.size(); i++) { 
     int a = i + 1; 
     //System.out.println("i is: " + i + " recipe number is: " + a); 
    } 
    //System.out.println("pages is: " + pages + " size is: " + recipes.size()); 
    pagesArray = new ArrayList<>(); 
    Page page; 
    for (int i = 0; i < recipes.size(); i = i + showValue) { 
     page = new Page(); 
     page.setPageDisabled(false); 
     page.setFirstItem(i); 
     page.setLastItem(i + showValue - 1); 
     pagesArray.add(page); 
    } 
    for (int i = 0; i < pagesArray.size(); i++) { 
     pagesArray.get(i).setPageNumber(i + 1); 
    } 
    pagesArray.get(pagesArray.size() - 1).setLastItem(recipes.size() - 1); 
    /* for (int i = 0; i < pagesArray.size(); i++) { 
    System.out.println(pagesArray.get(i).getPageNumber() + " " + pagesArray.get(i).getFirstItem() + " " + pagesArray.get(i).getLastItem() + " " + pagesArray.get(i).isPageDisabled()); 
    }*/ 
    recipesView = new ArrayList<>(); 
    Recipe recipe; 
    for (int i = pagesArray.get(0).getFirstItem(); i <= pagesArray.get(0).getLastItem(); i++) { 
     recipe = new Recipe(); 
     recipe.setAuthor(recipes.get(i).getAuthor()); 
     recipe.setId(recipes.get(i).getId()); 
     recipe.setCreateDate(recipes.get(i).getCreateDate()); 
     recipe.setTitle(recipes.get(i).getTitle()); 
     recipesView.add(recipe); 
    } 
    pagesArray.get(0).setPageDisabled(true); 
} 

public void doPages() { 
    FacesContext fc = FacesContext.getCurrentInstance(); 
    this.currentPage = Integer.parseInt(getCountryParam(fc)); 
    System.out.println(currentPage); 
    recipesView = new ArrayList<>(); 
    Recipe recipe; 
    for (int i = pagesArray.get(currentPage - 1).getFirstItem(); i <= pagesArray.get(currentPage - 1).getLastItem(); i++) { 
     System.out.println(i); 
     recipe = new Recipe(); 
     recipe.setAuthor(recipes.get(i).getAuthor()); 
     recipe.setId(recipes.get(i).getId()); 
     recipe.setCreateDate(recipes.get(i).getCreateDate()); 
     recipe.setTitle(recipes.get(i).getTitle()); 
     recipesView.add(recipe); 
    } 
    for (int i = 0; i < pagesArray.size(); i++) { 
     pagesArray.get(i).setPageDisabled(false); 
    } 
    pagesArray.get(currentPage - 1).setPageDisabled(true); 
} 

public String getCountryParam(FacesContext fc) { 
    Map<String, String> params = fc.getExternalContext().getRequestParameterMap(); 
    return params.get("currentPage"); 
} 


//setters&getters 

} 

我的搜索视图：

<h:form> 
     <h:selectOneMenu value="#{search.language}"> 
      <f:selectItem itemLabel="English" itemValue="en"/> 
      <f:selectItem itemLabel="Select" itemValue=""/> 
      <f:selectItem itemLabel="Bulgarian" itemValue="bg"/> 
     </h:selectOneMenu> 
     <h:commandButton value="Submit" type="submit" action="#{search.submit()}"> 
      <f:param name="lang" value ="#{search.language}"/> 
     </h:commandButton> 
</h:form> 

我的结果视图：

<f:metadata> 
     <f:viewParam name="lang" value="#{result.language}" /> 
     <f:viewAction action="#{result.init()}" /> 
    </f:metadata> 

<h:form> 
      <ui:repeat value="#{result.recipesView}" var="rec"> 
       <h:link value="#{rec.title}" outcome="recipeshow"> 
        <f:param name="id" value="#{rec.id}" /> 
       </h:link> 
       <br/> 
       <h:outputText value="#{rec.id}"/><br/> 
       <h:outputText value="#{rec.author}"/><br/> 
       <h:outputText value="#{rec.createDate}"/><br/> 
       <br/> 
      </ui:repeat> 
      <br/> 
      <ui:repeat value="#{result.pagesArray}" var="page"> 
       <h:commandLink value="#{page.pageNumber}" disabled="#{page.pageDisabled}"> 
        <f:ajax listener="#{result.doPages()}" render="@form"/> 
        <f:param name="currentPage" value="#{page.pageNumber}"/> 
       </h:commandLink>     &nbsp; 
      </ui:repeat> 
     </h:form> 

我page.java

public class Page { 

private int pageNumber; 
private boolean pageDisabled; 
private int firstItem; 
private int lastItem; 

public int getPageNumber() { 
    return pageNumber; 
} 

public void setPageNumber(int pageNumber) { 
    this.pageNumber = pageNumber; 
} 

public boolean isPageDisabled() { 
    return pageDisabled; 
} 

public void setPageDisabled(boolean pageDisabled) { 
    this.pageDisabled = pageDisabled; 
} 

public int getFirstItem() { 
    return firstItem; 
} 

public void setFirstItem(int firstItem) { 
    this.firstItem = firstItem; 
} 

public int getLastItem() { 
    return lastItem; 
} 

public void setLastItem(int lastItem) { 
    this.lastItem = lastItem; 
} 
} 

Answer 1

您从操作方法返回了导航案例结果，因此您的视图范围bean将被重新创建，这就是为什么您看不到结果。另一方面，由于您似乎正在根据视图范围内的信息进行分页，因此您的请求范围的bean不允许正确的分页。

至于解决方案，您应该从您的操作方法做回发，因此返回null或void，或者使用get参数将必要的信息传递给结果视图。

还值得注意的是，您在recipes = recipeDAO.searchRecipe(language);中预加载了太多信息：您应该加载的信息与您的视图中显示的信息相同，例如：recipes = recipeDAO.searchRecipe(language, min, max);。