我想从下拉在一个jsp页“选择”“形式”的列表转换成在动作类的形式，其中“选择”的定义的变量取一选定值下拉列表本身是从列动态取回'命名‘与列表‘这是一些其他动作类中定义所属分类’类别”数据库表’。
取所选择的值之后（即类别的名称）我想获取主键的表“类别”的“CID”。 类别的栏目有：ID，名称
该类别的检索“CID”后，我想填补这一CID另一个表“问题”的列“CID”。
我使用的struts2和休眠。
我的专栏是“名”和表是“类别”我已经做了映射配置和bean类。
我的动作类的代码，其中生成列表：
public class FindCategory extends ActionSupport {
private List<Category> categoryList = new ArrayList<Category>();
@Override
public String execute() throws Exception {
Session session = null;
try {
session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
this.categoryList = (List<Category>) session.createQuery("from Category").list();
if (this.categoryList.isEmpty()) {
this.addActionError("Sorry.. No category Available. Try again Later.!");
return ERROR;
}
session.getTransaction().commit();
} catch (Exception e) {
this.addActionError("Oops. An Error Encountered...!");
return ERROR;
}
return SUCCESS;
}
public List<Category> getCategoryList() {
return categoryList;
}
public void setCategoryList(List<Category> categoryList) {
this.categoryList = categoryList;
}
}
代码在JSP页面中的“形式”：
<s:form action="okadddqs" method="post" cssClass="text">
<input type="hidden" name="email" value="goods.ramesh@gmail.com"/>
<s:select label="Select Category :" name="name" list="categoryList" listkey="name" listValue="name"/> //Here the list is generated
<s:textarea label="Your Question " cols="40" rows="5" name="body"/>
<s:textfield name="op1" label="Option 1 :"/>
<s:textfield name="op2" label="Option 2 :"/>
<s:textfield name="op3" label="Option 3 :"/>
<s:textfield name="op4" label="Option 4 :"/>
<s:textfield name="op5" label="Option 5 :"/>
<s:select label="Correct Option :"
name="opc"
list="#@java.util.LinkedHashMap@{'1':'One',
'2':'Two','3':'Three','4':'Four','5':'Five'}"/>
<s:submit value="Update Daily Question"/>
</s:form>
我的行动来提交新问题类：
package com.rambo.action;
import beans.Category;
import beans.Question;
import beans.Users;
import com.opensymphony.xwork2.ActionSupport;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import org.hibernate.Session;
/**
*
* @author ROMO
*/
@ManagedBean
@SessionScoped
public class NewQuestion extends ActionSupport {
private String cname;
private List<Category> cl = new ArrayList<Category>();
public List<Category> getCl() {
return cl;
}
public void setCl(List<Category> cl) {
this.cl = cl;
}
@Override
public String execute() throws Exception {
Session session = null;
int c;
//c store the cid of the selected Category name from drop down list.
try {
session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
cl = (List<Category>) session.createQuery("from Category c where c.name = '" + getName() + "'");
if (!cl.isEmpty()) {
c = cl.get(0).getCid();
} else {
this.addActionError("Oops. Sorry No Category Available.");
session.close();
return ERROR;
}
u = new Question();
u.setCid(c);
u.setCname(getName());
session.save(u);
session.getTransaction().commit();
} catch (Exception e) {
this.addActionError("Oops. An Error Encountered...! Email address already registered. Try with your new email address.");
session.close();
return ERROR;
}
return SUCCESS;
}
@Override
public void validate() {
if ("".equals(getEmail()) || getEmail() == null ) {
this.addActionError("All Fields are Compulsory to input..!");
} else if (getEmail().indexOf("@") < 0 || getEmail().indexOf(",") > 0 || getEmail().indexOf(".") < 0) {
this.addActionError("Please Input a valid email address.");
}
}
}
映射Category.hbm.xml：
<property name="name" type="string">
<column name="NAME" length="20" not-null="true" />
</property>
Getter和豆“Category.java”的制定者：
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
我的GlassFish服务器显示错误为：
org.apache.jasper.JasperException: tag 'select', field 'list', name 'cname': The requested list key 'categoryList' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]
root cause tag 'select', field 'list', name 'cname': The requested list key 'categoryList' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]
可有一个人请指出什么可以b是出错误..？ 提前致谢。
