Java编程

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Java

TopicAction.java：源码内容

							/*
/*主题
*/
package StudyBbs;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import javax.servlet.ServletContext;
import javax.sql.DataSource;
import java.sql.Connection;
import java.util.Vector;
public final class TopicAction extends Action{  
	public ActionForward execute(
		ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,  
		HttpServletResponse response) throws Exception {
			
   		SortForm sortform = (SortForm) form; 
   		        
		int sortid = sortform.getSortid();
		String sortname = sortform.getSortname();
		int pageid = sortform.getPageid();
		if (pageid<0){
			pageid = 0;	
		}
		
        HttpSession session = request.getSession(true);
		Vector topics = new Vector();
		Topic topic;
		
   		ServletContext context = servlet.getServletContext();
		DataSource dataSource = 
			(DataSource)context.getAttribute(Constants.DATASOURCE_KEY);
						
        DB db = new DB(dataSource);
        TopicDisp topicdisp = new TopicDisp();
        
		String PageForward;
		ActionMessages errors = new ActionMessages();
        if (topicdisp.GetTopicCount(db,sortid)==0){
			session.setAttribute(Constants.TOPIC_LIST_KEY,topics);
//			session.setAttribute(Constants.TALK_TYPE_KEY,"topic");
			session.setAttribute(Constants.CUR_SORTID_KEY,new Integer(sortid));
			session.setAttribute(Constants.CUR_SORTNAME_KEY,sortname);
			session.setAttribute(Constants.CUR_PAGEID_KEY,new Integer(pageid));
  			PageForward="toTopic";  
        }
        else if (topicdisp.GetTopicCount(db,sortid)<pageid * Constants.TOPIC_PAGE_SIZE + 1){
        	pageid--;
            errors.add(ActionMessages.GLOBAL_MESSAGE,
                           new ActionMessage("errors.pageEnd"));
			if (!errors.isEmpty()) {
				saveErrors(request, errors);
			} 
 			PageForward="toWrong";  
		}
		else{
        	topicdisp.setSortid(sortid);
			topics = topicdisp.search(db,pageid);
			session.setAttribute(Constants.TOPIC_LIST_KEY,topics);
//			session.setAttribute(Constants.TALK_TYPE_KEY,"topic");
			session.setAttribute(Constants.CUR_SORTID_KEY,new Integer(sortid));
			session.setAttribute(Constants.CUR_SORTNAME_KEY,sortname);
			session.setAttribute(Constants.CUR_PAGEID_KEY,new Integer(pageid));
  			PageForward="toTopic";  
       }
		
		db.close();
	   	return (mapping.findForward(PageForward));			
 	}	
}

						