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有人可以帮我解决这个问题。我正在尝试在 JSF2.0 (xhtml page) 中创建一个用于显示、编辑和删除 UserGroup (MySQL DB 表) 中的数据的页面，该页面具有以下结构。我遇到的问题是数据实际上显示为 UserGroup 表的对象，而不是这些列中的可读值。我尝试了各种可用于 CRUD Web 应用程序的示例解决方案，但没有得到任何结果，我确定我缺少对显示和编辑行数据的整体理解。但是我的创建工作正常。我是否需要编写转换器来显示正确的值？

附加信息

  • Glassfish v3.1.2
  • JPA/Eclipselink v2.1
  • 数据库
  • JSF2.0
  • 日食朱诺 SR2

用户组表

  1. rowId（自动生成）
  2. groupId（组表中组 ID 的外键）
  3. 用户名（用户表中用户名的外键）

我现在得到的输出

Users's and their group.
Row Id    Group Id              Username 
9         model.Group@647d73bf  model.User@683a3423  
13        model.Group@2192bac5  model.User@2823ecbb

XHTML 代码

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!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:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:ui="http://java.sun.com/jsf/facelets">
<f:metadata>
    <f:viewParam name="userId" value="#{loginBean.username}"></f:viewParam>
</f:metadata>
<ui:composition>
    <h:head>
        <meta http-equiv="Content-Type"
            content="text/html; charset=ISO-8859-1" />
        <h1>Users's and their group.</h1>
        <title>Displaying Users and their Groups</title>
    </h:head>
    <h:body>
        <h:form id="form">
            <h:dataTable value="#{userGroupManagedBean.userGroup}" var="item">
                <h:column>
                    <f:facet name="header"> Row Id</f:facet> #{item.rowId}
</h:column>
                <h:column>
                    <f:facet name="header"> Group Id</f:facet> #{item.group}
</h:column>
                <h:column>
                    <f:facet name="header"> Username</f:facet> #{item.user}
</h:column>
            </h:dataTable>
        </h:form>
    </h:body>
</ui:composition>
</html>

*托管 Bean 类

package beans;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.ejb.EJB;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
//import javax.faces.model.DataModel;
//import javax.faces.model.ListDataModel;

import model.UserGroup;

import ejb.UserGroupDaoBean;

@ManagedBean(name = "userGroupManagedBean", eager = true)
@SessionScoped
public class UserGroupManageBean implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @EJB
    private UserGroupDaoBean uGDB;
    // private DataModel<UserGroup> userGroup;
    private List<UserGroup> userGroup;
    private UserGroup currentUserGroup;
    public String username;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public int getGroupId() {
        return groupId;
    }

    public void setGroupId(int groupId) {
        this.groupId = groupId;
    }

    public int groupId;

    // public void setUserGroup(DataModel<UserGroup> userGroup) {
    // this.userGroup = userGroup;
    // }

    public void setUserGroup(List<UserGroup> userGroup) {
        this.userGroup = userGroup;
    }

    public UserGroup getCurrentUserGroup() {
        return currentUserGroup;
    }

    @PostConstruct
    public void init() {

        getUserGroup();
    }

    public List<UserGroup> getUserGroup() {

        List<UserGroup> myAllUserGroups = new ArrayList<UserGroup>(
                uGDB.getAllUserGroups());

        return myAllUserGroups;
    }

    // public DataModel<UserGroup> getUserGroup() {
    // userGroup = new ListDataModel<UserGroup>(uGDB.getAllUserGroups());
    // System.out.println(userGroup);
    // return userGroup;
    // }

    // public String delete() {
    // UserGroup myUserGroup = userGroup.getRowData();
    // uGDB.deleteUserGroup(myUserGroup);
    // getUserGroup();
    // return
    // "displayUserGroup.jsf?faces-redirect=true&amp;includeViewParams=true";
    // }

    public String delete(UserGroup currentUserGroup) {
        userGroup.remove(currentUserGroup);
        getUserGroup();
        return "displayUserGroup.jsf?faces-redirect=true&amp;includeViewParams=true";
    }

    // public String edit(){
    // currentUserGroup = userGroup.getRowData();
    // System.out.println("And the current user group data is:" +
    // currentUserGroup);
    // getUserGroup();
    // return
    // "editUserGroup.jsf?faces-redirect=true&amp;includeViewParams=true";
    // }

    public String save() {

        uGDB.updateExistingUserGroup(currentUserGroup);

        getUserGroup();
        return "displayUserGroup.jsf?faces-redirect=true&amp;includeViewParams=true";
    }

    public String cancel() {
        // getUserGroup();
        return "displayUserGroup.jsf?faces-redirect=true&amp;includeViewParams=true";
    }

    public void setCurrentUserGroup(UserGroup currentUserGroup) {
        this.currentUserGroup = currentUserGroup;
    }
}

控制器类

package ejb;

import java.util.List;

import javax.ejb.LocalBean;
import javax.ejb.Stateful;

import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.Query;

import javax.persistence.PersistenceContext;

import model.Group;
import model.User;
import model.UserGroup;

@Stateful
@LocalBean
public class UserGroupDaoBean {
    @PersistenceContext(unitName = "myPU")
    private EntityManager entityManager;

    public UserGroupDaoBean() {

    }

    public UserGroup createNewUserGroup(int groupId, String username) {

        UserGroup newUserGrp = new UserGroup();

        User myUsr;
        myUsr = entityManager.find(User.class, username);
        newUserGrp.setUser(myUsr);

        Group myGrp;
        myGrp = entityManager.find(Group.class, groupId);
        newUserGrp.setGroup(myGrp);

        saveNewUsrGrp(newUserGrp);
        return newUserGrp;
    }

    private void saveNewUsrGrp(UserGroup usrGrp) {
        entityManager.persist(usrGrp);
        entityManager.flush();
    }

    public boolean checkUsertoGroup(String username, int groupId) {

        Group chkGrp;
        chkGrp = entityManager.find(Group.class, groupId);

        User chkUsr;
        chkUsr = entityManager.find(User.class, username);

        if (chkGrp != null) {

            if (chkUsr != null) {

                try {
                    entityManager.createNamedQuery("findGroupsbyUser")
                            .setParameter("username", chkUsr)
                            .setParameter("groupId", chkGrp).getSingleResult();
                    System.out.println("UserGroup already exists");
                    return false;
                } catch (NoResultException e) {
                    return true;
                }

            }
            System.out.println("User doesn't exist");
            return false;
        }
        System.out.println("Group doesn't exist");

        return false;

    }

    public void deleteUserGroup(UserGroup userGroup) {
        userGroup = entityManager.merge(userGroup);
        entityManager.remove(userGroup);
    }

    public UserGroup update(UserGroup userGroup) {

        UserGroup myUserGroup = entityManager.merge(userGroup);

        return entityManager.merge(myUserGroup);
    }

    public UserGroup updateExistingUserGroup(UserGroup userGroup){
        UserGroup myExistingUsrGrp = update(userGroup);
        return myExistingUsrGrp;
    }

    @SuppressWarnings("unchecked")
    public List<UserGroup> getAllUserGroups() {

        try {
            Query query = entityManager.createNamedQuery("findAllUserGroup");
            List<UserGroup> result = (List<UserGroup>) query.getResultList();

            return result;

        } catch (NoResultException e) {
            System.out.println("No Result found");
            return null;
        }
    }

    public boolean validateGroup(User username) {

        Group groupId = entityManager.find(Group.class, 1);

        try {
            UserGroup myGroupId = (UserGroup) entityManager
                    .createNamedQuery("findAdminGroupId")
                    .setParameter("username", username)
                    .setParameter("groupId", groupId).getSingleResult();

            if (myGroupId != null) {
                System.out.println("This user is admin!!!");
                return true;
            }

        } catch (NoResultException e) {
            return false;
        }

        System.out.println("This user is not admin");
        return false;
    }

用户组 POJO

package model;

import java.io.Serializable;
import javax.persistence.*;


/**
 * The persistent class for the UserGroup database table.
 * 
 */
@NamedQueries({

    @NamedQuery(name = "findGroupsbyUser", query = "Select ug.group from UserGroup ug where ug.user=:username AND ug.group=:groupId"),

    @NamedQuery(name = "findAllUserGroup", query="Select ug from UserGroup ug"),

    @NamedQuery(name = "findAdminGroupId", query = "Select ug from UserGroup ug where ug.user=:username AND ug.group=:groupId"),


})
@Entity
@Table(name="usergroup")
public class UserGroup implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="RowId" )
    private int rowId;

    //bi-directional many-to-one association to Group
    @ManyToOne
    @JoinColumn(name="groupId")
    private Group group;

    //bi-directional many-to-one association to User
    @ManyToOne
    @JoinColumn(name="username")
    private User user;

    public UserGroup() {
    }

    public int getRowId() {
        return this.rowId;
    }

    public void setRowId(int rowId) {
        this.rowId = rowId;
    }

    public Group getGroup() {
        return this.group;
    }

    public void setGroup(Group group) {
        this.group = group;
    }

    public User getUser() {
        return this.user;
    }

    public void setUser(User user) {
        this.user = user;
    }

}
4

1 回答 1

1

您将 userGroup 的组和用户对象传递给 JSF，而不是值。您可能想要传递 item.group.id 和 item.user.id 或它们的等价物。

于 2013-03-31T17:33:15.067 回答