Java 休眠选择字符串而不是对象

我对冬眠世界还不熟悉，我有一个自己无法解决的问题。请友善一点

我所拥有的：

public class Category  implements java.io.Serializable {


     private Integer id;
     private String name;
     private String description;

    public Category() {
    }

    public Category(String name, String description) {
        this.name = name;
        this.description = description;
    }
    public Category(String name, String description) {
       this.name = name;
       this.description = description;
    }

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

            public static List getAllCategories(){
               Session session = HibernateUtil.getSessionFactory().getCurrentSession();
               Transaction tx = session.beginTransaction();
               List results = session.createCriteria(Category.class, "category")
               .list();
               tx.commit();
               return results; 
            }

                    List categories = CategoriesManagement.getAllCategories();
                    map.addAttribute("categories", categories);

<c:forEach var="cat" items="${categories} ">
   ${cat.name}
</c:forEach>

• Netbeans IDE 8.0.2
• Mysql数据库（easyPHP）和一些表

我想要什么：

public class Category  implements java.io.Serializable {


     private Integer id;
     private String name;
     private String description;

    public Category() {
    }

    public Category(String name, String description) {
        this.name = name;
        this.description = description;
    }
    public Category(String name, String description) {
       this.name = name;
       this.description = description;
    }

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

            public static List getAllCategories(){
               Session session = HibernateUtil.getSessionFactory().getCurrentSession();
               Transaction tx = session.beginTransaction();
               List results = session.createCriteria(Category.class, "category")
               .list();
               tx.commit();
               return results; 
            }

                    List categories = CategoriesManagement.getAllCategories();
                    map.addAttribute("categories", categories);

<c:forEach var="cat" items="${categories} ">
   ${cat.name}
</c:forEach>

• 选择类别（表），其中有3条记录，分别为id、name和description，并使用EL在jsp中显示它们（name和description）

我的分类类别：

public class Category  implements java.io.Serializable {


     private Integer id;
     private String name;
     private String description;

    public Category() {
    }

    public Category(String name, String description) {
        this.name = name;
        this.description = description;
    }
    public Category(String name, String description) {
       this.name = name;
       this.description = description;
    }

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

            public static List getAllCategories(){
               Session session = HibernateUtil.getSessionFactory().getCurrentSession();
               Transaction tx = session.beginTransaction();
               List results = session.createCriteria(Category.class, "category")
               .list();
               tx.commit();
               return results; 
            }

                    List categories = CategoriesManagement.getAllCategories();
                    map.addAttribute("categories", categories);

<c:forEach var="cat" items="${categories} ">
   ${cat.name}
</c:forEach>

我的getCategories方法：

public class Category  implements java.io.Serializable {


     private Integer id;
     private String name;
     private String description;

    public Category() {
    }

    public Category(String name, String description) {
        this.name = name;
        this.description = description;
    }
    public Category(String name, String description) {
       this.name = name;
       this.description = description;
    }

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

            public static List getAllCategories(){
               Session session = HibernateUtil.getSessionFactory().getCurrentSession();
               Transaction tx = session.beginTransaction();
               List results = session.createCriteria(Category.class, "category")
               .list();
               tx.commit();
               return results; 
            }

                    List categories = CategoriesManagement.getAllCategories();
                    map.addAttribute("categories", categories);

<c:forEach var="cat" items="${categories} ">
   ${cat.name}
</c:forEach>

我的控制器：

public class Category  implements java.io.Serializable {


     private Integer id;
     private String name;
     private String description;

    public Category() {
    }

    public Category(String name, String description) {
        this.name = name;
        this.description = description;
    }
    public Category(String name, String description) {
       this.name = name;
       this.description = description;
    }

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

            public static List getAllCategories(){
               Session session = HibernateUtil.getSessionFactory().getCurrentSession();
               Transaction tx = session.beginTransaction();
               List results = session.createCriteria(Category.class, "category")
               .list();
               tx.commit();
               return results; 
            }

                    List categories = CategoriesManagement.getAllCategories();
                    map.addAttribute("categories", categories);

<c:forEach var="cat" items="${categories} ">
   ${cat.name}
</c:forEach>

我的视图（jsp）：

public class Category  implements java.io.Serializable {


     private Integer id;
     private String name;
     private String description;

    public Category() {
    }

    public Category(String name, String description) {
        this.name = name;
        this.description = description;
    }
    public Category(String name, String description) {
       this.name = name;
       this.description = description;
    }

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

            public static List getAllCategories(){
               Session session = HibernateUtil.getSessionFactory().getCurrentSession();
               Transaction tx = session.beginTransaction();
               List results = session.createCriteria(Category.class, "category")
               .list();
               tx.commit();
               return results; 
            }

                    List categories = CategoriesManagement.getAllCategories();
                    map.addAttribute("categories", categories);

<c:forEach var="cat" items="${categories} ">
   ${cat.name}
</c:forEach>

当我显示${cat}时，它会说：

java.lang.String
java.lang.String
java.lang.String

com.company.Category@7136faa
com.company.Category@25636faa
com.company.Category@83baeaa

更新：

public class Category  implements java.io.Serializable {


     private Integer id;
     private String name;
     private String description;

    public Category() {
    }

    public Category(String name, String description) {
        this.name = name;
        this.description = description;
    }
    public Category(String name, String description) {
       this.name = name;
       this.description = description;
    }

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

            public static List getAllCategories(){
               Session session = HibernateUtil.getSessionFactory().getCurrentSession();
               Transaction tx = session.beginTransaction();
               List results = session.createCriteria(Category.class, "category")
               .list();
               tx.commit();
               return results; 
            }

                    List categories = CategoriesManagement.getAllCategories();
                    map.addAttribute("categories", categories);

<c:forEach var="cat" items="${categories} ">
   ${cat.name}
</c:forEach>

当我在类别中重新定义toString（）方法时，如下所示：

public toString(){
   return "foo";
}

我得到：

[foo
foo
foo]

---

提前谢谢。

用这个：

我知道它很好，9个小时后我发现空间在

是错误， 我应该这样做：

---

谢谢@Reimeus，我用输出和我的Category类更新了帖子。您可以将值打印为，${cat.name}和${cat.description}。这就是你想要实现的吗？是的，Prerak，但我什么也得不到……我想说，在从控制器返回列表之前，先打印出列表的内容。当我更新我的答案时，hibernate使用toString方法并返回返回的值。现在我的列表中有三个“foo”字符串。它应该做的是选择类别类型的3个对象。