topicinsertaction.java

J2EE电子商务系统开发从入门到精通---基于Struts和Hibernate技术实现

/*
 * TopicInsertAction.java
 *
 * Created on 2006年6月15日, 下午10:32
 */

package action.bbs;

import form.bbs.TopicForm;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import model.bbs.hibernate.*;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
/**
 *
 * @author Administrator
 * @version
 */

public class TopicInsertAction extends Action {
    
    /* forward name="success" path="" */
    private final static String SUCCESS = "success";
    
    /**
     * This is the action called from the Struts framework.
     * @param mapping The ActionMapping used to select this instance.
     * @param form The optional ActionForm bean for this request.
     * @param request The HTTP Request we are processing.
     * @param response The HTTP Response we are processing.
     * @throws java.lang.Exception
     * @return
     */
    public ActionForward execute(ActionMapping mapping, ActionForm  form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        // 获得页面表单中用户输入的信息
        TopicForm insertForm = (TopicForm)form;
        Topic topic = new Topic();
        topic.setName(insertForm.getName());
        topic.setRemarks(insertForm.getRemarks());
        
        // 根据用户的表单输入信息，向数据库中插入一条主题信息
        boolean isSuccess = TopicUtil.insert(topic);
        if (isSuccess == false) {
            return new ActionForward(mapping.getInput());
        }
        
        // 从数据库读取当前所有的主题空间信息
        List list = TopicUtil.findAll();
        if (list == null) {
            return new ActionForward(mapping.getInput());
        }

        // 获得HttpSession缓存
        HttpSession httpSession = request.getSession();
        // 将查询得到的所有主题空间信息存入缓存
        httpSession.setAttribute("topiclist", list);
        
        return mapping.findForward(SUCCESS);        
    }
}