読者です 読者をやめる 読者になる 読者になる

JavaEE 6 を Netbeans 使って、


前回までは IDE を使わずに JavaEE6 を触って見ましたが、普通はやっぱり IDE 使うわけで、

プロジェクトの作成

ファイル > 新規プロジェクト で Webアプリケーションを選択


プロジェクト名を適当に


コンテキストと依存性の注入を有効にして CDI を利用できるように


JSF 選択

で、プロジェクトができる。

CDI 利用のための beans.xml とかもできている


エンティテイの作成

作成したプロジェクト選択して、新規 > その他 でエンティテイ・クラス を選択


Book エンティティとする


データソースにデフォルトを選択


Bookクラスが出来るので、属性を追加して

    private String title;
    private String description;

getter/setter の追加


エンティテイから JSF 作成

作成したプロジェクト選択して、新規 > その他 でエンティテイからのJSFページ・クラス を選択


先ほど作成した Book エンティテイを追加


特に変更なし


終了すると、これらのファイルが作成される

JSF のコントローラやら、各種のページの xhtml などができている


実行

この時点で、「実行」できる


Book エンティティの CRUD 操作ができる





追加したコードはエンィティの属性だけで簡単


いちおう自動生成されたソースをつけとくと

自動生成された EJB

ステートレスセッションビーン として BookFacade が作られる

@Stateless
public class BookFacade extends AbstractFacade<Book> {

    @PersistenceContext(unitName = "SampleAppPU")
    private EntityManager em;

    @Override
    protected EntityManager getEntityManager() {
        return em;
    }

    public BookFacade() {
        super(Book.class);
    }
}


で、BookFacade の親の AbstractFacade で EntityManager 操作が実装されてる

public abstract class AbstractFacade<T> {
    private Class<T> entityClass;

    public AbstractFacade(Class<T> entityClass) {
        this.entityClass = entityClass;
    }

    protected abstract EntityManager getEntityManager();

    public void create(T entity) {
        getEntityManager().persist(entity);
    }

    public void edit(T entity) {
        getEntityManager().merge(entity);
    }

    public void remove(T entity) {
        getEntityManager().remove(getEntityManager().merge(entity));
    }

    public T find(Object id) {
        return getEntityManager().find(entityClass, id);
    }

    public List<T> findAll() {
        javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
        cq.select(cq.from(entityClass));
        return getEntityManager().createQuery(cq).getResultList();
    }

    public List<T> findRange(int[] range) {
        javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
        cq.select(cq.from(entityClass));
        javax.persistence.Query q = getEntityManager().createQuery(cq);
        q.setMaxResults(range[1] - range[0]);
        q.setFirstResult(range[0]);
        return q.getResultList();
    }

    public int count() {
        javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
        javax.persistence.criteria.Root<T> rt = cq.from(entityClass);
        cq.select(getEntityManager().getCriteriaBuilder().count(rt));
        javax.persistence.Query q = getEntityManager().createQuery(cq);
        return ((Long) q.getSingleResult()).intValue();
    }
}

EntityManager 経由で CRUD


自動生成された JSF

Model 部分

@Named("bookController")
@SessionScoped
public class BookController implements Serializable {

    private Book current;
    private DataModel items = null;
    @EJB
    private etc9.BookFacade ejbFacade;
    private PaginationHelper pagination;
    private int selectedItemIndex;

    public BookController() { }

    public Book getSelected() {
        if (current == null) {
            current = new Book();
            selectedItemIndex = -1;
        }
        return current;
    }

    private BookFacade getFacade() {
        return ejbFacade;
    }

    public PaginationHelper getPagination() {
        if (pagination == null) {
            pagination = new PaginationHelper(10) {
                @Override
                public int getItemsCount() {
                    return getFacade().count();
                }

                @Override
                public DataModel createPageDataModel() {
                    return new ListDataModel(getFacade().findRange(new int[]{getPageFirstItem(), getPageFirstItem() + getPageSize()}));
                }
            };
        }
        return pagination;
    }

    public String prepareList() {
        recreateModel();
        return "List";
    }

    public String prepareView() {
        current = (Book) getItems().getRowData();
        selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
        return "View";
    }

    public String prepareCreate() {
        current = new Book();
        selectedItemIndex = -1;
        return "Create";
    }

    public String create() {
        try {
            getFacade().create(current);
            JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("BookCreated"));
            return prepareCreate();
        } catch (Exception e) {
            JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
            return null;
        }
    }

    public String prepareEdit() {
        current = (Book) getItems().getRowData();
        selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
        return "Edit";
    }

    public String update() {
        try {
            getFacade().edit(current);
            JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("BookUpdated"));
            return "View";
        } catch (Exception e) {
            JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
            return null;
        }
    }

    public String destroy() {
        current = (Book) getItems().getRowData();
        selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
        performDestroy();
        recreatePagination();
        recreateModel();
        return "List";
    }

    public String destroyAndView() {
        performDestroy();
        recreateModel();
        updateCurrentItem();
        if (selectedItemIndex >= 0) {
            return "View";
        } else {
            // all items were removed - go back to list
            recreateModel();
            return "List";
        }
    }

    private void performDestroy() {
        try {
            getFacade().remove(current);
            JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("BookDeleted"));
        } catch (Exception e) {
            JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
        }
    }

    private void updateCurrentItem() {
        int count = getFacade().count();
        if (selectedItemIndex >= count) {
            // selected index cannot be bigger than number of items:
            selectedItemIndex = count - 1;
            // go to previous page if last page disappeared:
            if (pagination.getPageFirstItem() >= count) {
                pagination.previousPage();
            }
        }
        if (selectedItemIndex >= 0) {
            current = getFacade().findRange(new int[]{selectedItemIndex, selectedItemIndex + 1}).get(0);
        }
    }

    public DataModel getItems() {
        if (items == null) {
            items = getPagination().createPageDataModel();
        }
        return items;
    }

    private void recreateModel() {
        items = null;
    }

    private void recreatePagination() {
        pagination = null;
    }

    public String next() {
        getPagination().nextPage();
        recreateModel();
        return "List";
    }

    public String previous() {
        getPagination().previousPage();
        recreateModel();
        return "List";
    }

    public SelectItem[] getItemsAvailableSelectMany() {
        return JsfUtil.getSelectItems(ejbFacade.findAll(), false);
    }

    public SelectItem[] getItemsAvailableSelectOne() {
        return JsfUtil.getSelectItems(ejbFacade.findAll(), true);
    }

    @FacesConverter(forClass = Book.class)
    public static class BookControllerConverter implements Converter {

        public Object getAsObject(FacesContext facesContext, UIComponent component, String value) {
            if (value == null || value.length() == 0) {
                return null;
            }
            BookController controller = (BookController) facesContext.getApplication().getELResolver().
                    getValue(facesContext.getELContext(), null, "bookController");
            return controller.ejbFacade.find(getKey(value));
        }

        java.lang.Long getKey(String value) {
            java.lang.Long key;
            key = Long.valueOf(value);
            return key;
        }

        String getStringKey(java.lang.Long value) {
            StringBuffer sb = new StringBuffer();
            sb.append(value);
            return sb.toString();
        }

        public String getAsString(FacesContext facesContext, UIComponent component, Object object) {
            if (object == null) {
                return null;
            }
            if (object instanceof Book) {
                Book o = (Book) object;
                return getStringKey(o.getId());
            } else {
                throw new IllegalArgumentException("object " + object + " is of type " + object.getClass().getName() + "; expected type: " + Book.class.getName());
            }
        }
    }
}
  • ちょっと長い。ページからの各Actionが実装されてる
  • PaginationHelper とやらでページング
  • ResourceBundle で文言外出し
  • JsfUtil なるユーティリティでページ用の boilerplate を扱っている
  • FacesConverter にてリクエストのコンバータ処理が実装されている

PaginationHelper

package etc9.util;

import javax.faces.model.DataModel;

public abstract class PaginationHelper {

    private int pageSize;
    private int page;

    public PaginationHelper(int pageSize) {
        this.pageSize = pageSize;
    }

    public abstract int getItemsCount();

    public abstract DataModel createPageDataModel();

    public int getPageFirstItem() {
        return page * pageSize;
    }

    public int getPageLastItem() {
        int i = getPageFirstItem() + pageSize - 1;
        int count = getItemsCount() - 1;
        if (i > count) {
            i = count;
        }
        if (i < 0) {
            i = 0;
        }
        return i;
    }

    public boolean isHasNextPage() {
        return (page + 1) * pageSize + 1 <= getItemsCount();
    }

    public void nextPage() {
        if (isHasNextPage()) {
            page++;
        }
    }

    public boolean isHasPreviousPage() {
        return page > 0;
    }

    public void previousPage() {
        if (isHasPreviousPage()) {
            page--;
        }
    }

    public int getPageSize() {
        return pageSize;
    }
}

JsfUtil

public class JsfUtil {

    public static SelectItem[] getSelectItems(List<?> entities, boolean selectOne) {
        int size = selectOne ? entities.size() + 1 : entities.size();
        SelectItem[] items = new SelectItem[size];
        int i = 0;
        if (selectOne) {
            items[0] = new SelectItem("", "---");
            i++;
        }
        for (Object x : entities) {
            items[i++] = new SelectItem(x, x.toString());
        }
        return items;
    }

    public static void addErrorMessage(Exception ex, String defaultMsg) {
        String msg = ex.getLocalizedMessage();
        if (msg != null && msg.length() > 0) {
            addErrorMessage(msg);
        } else {
            addErrorMessage(defaultMsg);
        }
    }

    public static void addErrorMessages(List<String> messages) {
        for (String message : messages) {
            addErrorMessage(message);
        }
    }

    public static void addErrorMessage(String msg) {
        FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, msg);
        FacesContext.getCurrentInstance().addMessage(null, facesMsg);
    }

    public static void addSuccessMessage(String msg) {
        FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_INFO, msg, msg);
        FacesContext.getCurrentInstance().addMessage("successInfo", facesMsg);
    }

    public static String getRequestParameter(String key) {
        return FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get(key);
    }

    public static Object getObjectFromRequestParameter(String requestParameterName, Converter converter, UIComponent component) {
        String theId = JsfUtil.getRequestParameter(requestParameterName);
        return converter.getAsObject(FacesContext.getCurrentInstance(), component, theId);
    }
}

ページ

template.xhtml がページのテンプレ

<?xml version='1.0' encoding='UTF-8' ?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html">
    <h:head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <title><ui:insert name="title">Default Title</ui:insert></title>
<h:outputStylesheet name="css/jsfcrud.css"/>
    </h:head>

    <h:body>
        <h1>
            <ui:insert name="title">Default Title</ui:insert>
        </h1>
        <p>
            <ui:insert name="body">Default Body</ui:insert>
        </p>
    </h:body>

</html>
一覧ページ
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core">

    <ui:composition template="/template.xhtml">
        <ui:define name="title">
            <h:outputText value="#{bundle.ListBookTitle}"></h:outputText>
        </ui:define>
        <ui:define name="body">
            <h:form styleClass="jsfcrud_list_form">
                <h:panelGroup id="messagePanel" layout="block">
                    <h:messages errorStyle="color: red" infoStyle="color: green" layout="table"/>
                </h:panelGroup>
                <h:outputText escape="false" value="#{bundle.ListBookEmpty}" rendered="#{bookController.items.rowCount == 0}"/>
                <h:panelGroup rendered="#{bookController.items.rowCount > 0}">
                    <h:outputText value="#{bookController.pagination.pageFirstItem + 1}..#{bookController.pagination.pageLastItem + 1}/#{bookController.pagination.itemsCount}"/>&nbsp;
                    <h:commandLink action="#{bookController.previous}" value="#{bundle.Previous} #{bookController.pagination.pageSize}" rendered="#{bookController.pagination.hasPreviousPage}"/>&nbsp;
                    <h:commandLink action="#{bookController.next}" value="#{bundle.Next} #{bookController.pagination.pageSize}" rendered="#{bookController.pagination.hasNextPage}"/>&nbsp;
                    <h:dataTable value="#{bookController.items}" var="item" border="0" cellpadding="2" cellspacing="0" rowClasses="jsfcrud_odd_row,jsfcrud_even_row" rules="all" style="border:solid 1px">
                        <h:column>
                            <f:facet name="header">
                                <h:outputText value="#{bundle.ListBookTitle_title}"/>
                            </f:facet>
                            <h:outputText value="#{item.title}"/>
                        </h:column>
                        <h:column>
                            <f:facet name="header">
                                <h:outputText value="#{bundle.ListBookTitle_description}"/>
                            </f:facet>
                            <h:outputText value="#{item.description}"/>
                        </h:column>
                        <h:column>
                            <f:facet name="header">
                                <h:outputText value="#{bundle.ListBookTitle_id}"/>
                            </f:facet>
                            <h:outputText value="#{item.id}"/>
                        </h:column>
                        <h:column>
                            <f:facet name="header">
                                <h:outputText value="&nbsp;"/>
                            </f:facet>
                            <h:commandLink action="#{bookController.prepareView}" value="#{bundle.ListBookViewLink}"/>
                            <h:outputText value=" "/>
                            <h:commandLink action="#{bookController.prepareEdit}" value="#{bundle.ListBookEditLink}"/>
                            <h:outputText value=" "/>
                            <h:commandLink action="#{bookController.destroy}" value="#{bundle.ListBookDestroyLink}"/>
                        </h:column>
                    </h:dataTable>
                </h:panelGroup>
                <br />
                <h:commandLink action="#{bookController.prepareCreate}" value="#{bundle.ListBookCreateLink}"/>
                <br />
                <br />
                <h:link outcome="/index" value="#{bundle.ListBookIndexLink}"/>
            </h:form>
        </ui:define>
    </ui:composition>

</html>
編集ページ
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core">

    <ui:composition template="/template.xhtml">
        <ui:define name="title">
            <h:outputText value="#{bundle.EditBookTitle}"></h:outputText>
        </ui:define>
        <ui:define name="body">
            <h:panelGroup id="messagePanel" layout="block">
                <h:messages errorStyle="color: red" infoStyle="color: green" layout="table"/>
            </h:panelGroup>
            <h:form>
                <h:panelGrid columns="2">
                    <h:outputLabel value="#{bundle.EditBookLabel_title}" for="title" />
                    <h:inputText id="title" value="#{bookController.selected.title}" title="#{bundle.EditBookTitle_title}" />
                    <h:outputLabel value="#{bundle.EditBookLabel_description}" for="description" />
                    <h:inputText id="description" value="#{bookController.selected.description}" title="#{bundle.EditBookTitle_description}" />
                    <h:outputLabel value="#{bundle.EditBookLabel_id}" for="id" />
                    <h:inputText id="id" value="#{bookController.selected.id}" title="#{bundle.EditBookTitle_id}" />
                </h:panelGrid>
                <h:commandLink action="#{bookController.update}" value="#{bundle.EditBookSaveLink}"/>
                <br />
                <br />
                <h:link outcome="View" value="#{bundle.EditBookViewLink}"/>
                <br />
                <h:commandLink action="#{bookController.prepareList}" value="#{bundle.EditBookShowAllLink}" immediate="true"/>
                <br />
                <br />
                <h:link outcome="/index" value="#{bundle.EditBookIndexLink}" />
            </h:form>
        </ui:define>
    </ui:composition>

</html>
登録ページ
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core">

    <ui:composition template="/template.xhtml">
        <ui:define name="title">
            <h:outputText value="#{bundle.CreateBookTitle}"></h:outputText>
        </ui:define>
        <ui:define name="body">
            <h:panelGroup id="messagePanel" layout="block">
                <h:messages errorStyle="color: red" infoStyle="color: green" layout="table"/>
            </h:panelGroup>
            <h:form>
                <h:panelGrid columns="2">
                    <h:outputLabel value="#{bundle.CreateBookLabel_title}" for="title" />
                    <h:inputText id="title" value="#{bookController.selected.title}" title="#{bundle.CreateBookTitle_title}" />
                    <h:outputLabel value="#{bundle.CreateBookLabel_description}" for="description" />
                    <h:inputText id="description" value="#{bookController.selected.description}" title="#{bundle.CreateBookTitle_description}" />
                    <h:outputLabel value="#{bundle.CreateBookLabel_id}" for="id" />
                    <h:inputText id="id" value="#{bookController.selected.id}" title="#{bundle.CreateBookTitle_id}" />
                </h:panelGrid>
                <br />
                <h:commandLink action="#{bookController.create}" value="#{bundle.CreateBookSaveLink}" />
                <br />
                <br />
                <h:commandLink action="#{bookController.prepareList}" value="#{bundle.CreateBookShowAllLink}" immediate="true"/>
                <br />
                <br />
                <h:link outcome="/index" value="#{bundle.CreateBookIndexLink}"/>
            </h:form>
        </ui:define>
    </ui:composition>

</html>


といったところ