guestaction.java

用ajax在ssh框架下发挥

package com.news.struts.action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;

import com.news.service.IguestBookService;
import com.news.struts.form.GuestForm;
import com.news.utils.Check;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class GuestAction extends DispatchAction {
	private IguestBookService userinfoServiceGuestBook;
	
	public ActionForward add(ActionMapping mapping,ActionForm form,
		HttpServletRequest request,HttpServletResponse response) throws IOException {
		
		GuestForm guestForm = (GuestForm) form;
		String rand = (String) request.getSession().getAttribute("rand");
		if(guestForm.getName()!=null&&!guestForm.getName().equals("")
			&&guestForm.getGuestcontent()!=null&&!guestForm.getGuestcontent().equals("")
			&&!guestForm.getNewid().equals("")&&guestForm.getNewid()!=null
			&&guestForm.getRand().equals(rand)&&guestForm.getRand()!=null
			&&!guestForm.getRand().equals("")){
				getUserinfoServiceGuestBook().add(guestForm);
				guestForm.setName(null);
				guestForm.setImage(null);
				guestForm.setGuestcontent(null);
				guestForm.setRand(null);
		}
		guestForm.setRand(null);
		request.getSession().removeAttribute("rand");
		//query(mapping, form,request,response);
		//check(mapping, form,request,response);
		return mapping.findForward("ok");
	}
	
	public ActionForward query(ActionMapping mapping,ActionForm form,
			HttpServletRequest request,HttpServletResponse response) {
			GuestForm guestForm = (GuestForm) form;
			String strHql = "from Guestbook where newid = ? order by date2 desc";
			String strHql2 = "select count(Guestbook.date2)";
			GuestHelp help = new GuestHelp();
			help.queryHelp(request,strHql,strHql2,userinfoServiceGuestBook,guestForm);
			guestForm.setNewid(guestForm.getNewid());
			return mapping.findForward("guest");
		}
	
	
	public ActionForward check(ActionMapping mapping,ActionForm form,
			HttpServletRequest request,HttpServletResponse response) throws IOException {
			GuestForm guestForm = (GuestForm) form;
			response.setHeader("Pragma","No-cache");
			response.setHeader("Cache-Control","no-cache");
			response.setDateHeader("Expires", 0);
			response.setContentType("image/jpeg");
			
			int width=60, height=20;
			BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

			Graphics g = image.getGraphics();

			Random random = new Random();
			
			Check check = new Check();
			
			g.setColor(check.getRandColor(200,250));
			g.fillRect(0, 0, width, height);

			g.setFont(new Font("Times New Roman",Font.PLAIN,18));

			g.setColor(check.getRandColor(160,200));
			for (int i=0;i<155;i++)
			{
			 int x = random.nextInt(width);
			 int y = random.nextInt(height);
			        int xl = random.nextInt(12);
			        int yl = random.nextInt(12);
			 g.drawLine(x,y,x+xl,y+yl);
			}
			String sRand="";
			for (int i=0;i<4;i++){
			    String rand=String.valueOf(random.nextInt(10));
			    sRand+=rand;
			    g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
			    g.drawString(rand,13*i+6,16);
			}
			request.getSession().setAttribute("rand",sRand);
			
			ServletOutputStream out = response.getOutputStream(); 
			JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); 
			encoder.encode(image);
			out.close();
			return null;
		}
	
	
	public IguestBookService getUserinfoServiceGuestBook() {
		return userinfoServiceGuestBook;
	}
	public void setUserinfoServiceGuestBook(
			IguestBookService userinfoServiceGuestBook) {
		this.userinfoServiceGuestBook = userinfoServiceGuestBook;
	}

}