我正在使用netbeans开发jsf应用程序，到目前为止，我已经设计了一个输入表单post.xhtml并从数据库生成实体类以及从实体类生成jpa控制器。我现在如何调用jsf页面的方法来将数据保存到表中?
jsf页面仍然没有标签
<?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://xmlns.jcp.org/jsf/facelets"
xmlns:h="http://xmlns.jcp.org/jsf/html">
<body>
<ui:composition template="./WEB-INF/template/newTemplate.xhtml" >
<ui:define name="content">
<h:inputText value="#{newPostEntityJpaController.}"></h:inputText>
</ui:define>
</ui:composition>
</body>
</html>
entity class
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package Entities;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
/**
*
* @author Admin
*/
@Entity
public class NewPostEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
// fields
private Number budget;
private String details;
//
public void setDetails(String details) {
this.details = details;
}
public String getDetails() {
return details;
}
public void setBudget(Number budget) {
this.budget = budget;
}
public Number getBudget() {
return budget;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof NewPostEntity)) {
return false;
}
NewPostEntity other = (NewPostEntity) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "Entities.NewEntity[ id=" + id + " ]";
}
}
controller
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package Controllers;
import Controllers.exceptions.NonexistentEntityException;
import Controllers.exceptions.RollbackFailureException;
import Entities.NewPostEntity;
import java.io.Serializable;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Query;
import javax.persistence.EntityNotFoundException;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import javax.transaction.UserTransaction;
/**
*
* @author Admin
*/
public class NewPostEntityJpaController implements Serializable {
public NewPostEntityJpaController(UserTransaction utx, EntityManagerFactory emf) {
this.utx = utx;
this.emf = emf;
}
private UserTransaction utx = null;
private EntityManagerFactory emf = null;
public EntityManager getEntityManager() {
return emf.createEntityManager();
}
public void create(NewPostEntity newPostEntity) throws RollbackFailureException, Exception {
EntityManager em = null;
try {
utx.begin();
em = getEntityManager();
em.persist(newPostEntity);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void edit(NewPostEntity newPostEntity) throws NonexistentEntityException, RollbackFailureException, Exception {
EntityManager em = null;
try {
utx.begin();
em = getEntityManager();
newPostEntity = em.merge(newPostEntity);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
String msg = ex.getLocalizedMessage();
if (msg == null || msg.length() == 0) {
Long id = newPostEntity.getId();
if (findNewPostEntity(id) == null) {
throw new NonexistentEntityException("The newPostEntity with id " + id + " no longer exists.");
}
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void destroy(Long id) throws NonexistentEntityException, RollbackFailureException, Exception {
EntityManager em = null;
try {
utx.begin();
em = getEntityManager();
NewPostEntity newPostEntity;
try {
newPostEntity = em.getReference(NewPostEntity.class, id);
newPostEntity.getId();
} catch (EntityNotFoundException enfe) {
throw new NonexistentEntityException("The newPostEntity with id " + id + " no longer exists.", enfe);
}
em.remove(newPostEntity);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public List<NewPostEntity> findNewPostEntityEntities() {
return findNewPostEntityEntities(true, -1, -1);
}
public List<NewPostEntity> findNewPostEntityEntities(int maxResults, int firstResult) {
return findNewPostEntityEntities(false, maxResults, firstResult);
}
private List<NewPostEntity> findNewPostEntityEntities(boolean all, int maxResults, int firstResult) {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
cq.select(cq.from(NewPostEntity.class));
Query q = em.createQuery(cq);
if (!all) {
q.setMaxResults(maxResults);
q.setFirstResult(firstResult);
}
return q.getResultList();
} finally {
em.close();
}
}
public NewPostEntity findNewPostEntity(Long id) {
EntityManager em = getEntityManager();
try {
return em.find(NewPostEntity.class, id);
} finally {
em.close();
}
}
public int getNewPostEntityCount() {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
Root<NewPostEntity> rt = cq.from(NewPostEntity.class);
cq.select(em.getCriteriaBuilder().count(rt));
Query q = em.createQuery(cq);
return ((Long) q.getSingleResult()).intValue();
} finally {
em.close();
}
}
}
首先要确保关闭字段内标记。添加按钮的形式，将用于存储数据到数据库。你的控制器更像一个服务，而不是控制器，但要给它添加@Named和@ViewScoped注释。添加动作:
public void savePost(){
if (newPostEntity != null)
create(newPostEntity);
}
然后添加带有setter和getter的NewPostEntity字段。
<h:form>
<h:inputText value="#{newPostEntityJpaController.newPostEntity.details}"></h:inputText>
<h:commandButton action="#{newPostEntityJpaController.saveMessage}">
</h:form>
提示:在应用程序中为dao、服务和控制器创建不同的层。我的解决方案只是为了让你看看它是有效的，它不应该出现在最终产品中。