validatorcodeaction.java

模仿当当网基于struts+hierbernate与mysql的商务网站。

package org.whatisjava.dang.action;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.OutputStream;
import java.util.Random;

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 com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;



public class ValidatorCodeAction extends Action {

	@Override
	public ActionForward execute( ActionMapping mapping,ActionForm form,HttpServletRequest req,
			HttpServletResponse res) throws Exception {
//		 设置session
		Random r = new Random();
		String code =String.valueOf(r.nextInt(999999));
		HttpSession session=req.getSession();
		session.setAttribute("numberCode",code);
		// 设置响应类型
		res.setContentType("image/jpeg");
		BufferedImage bimg = new BufferedImage(100, 30,
				BufferedImage.TYPE_INT_RGB);
		Graphics g = bimg.getGraphics();
		int x=r.nextInt(255),y=r.nextInt(255),z=r.nextInt(255);
		g.setColor(new Color(x,y,z));
		g.fillRect(0, 0, 100, 30);
		//随机画线条
		for (int i = 0; i <19; i++) {
			g
					.setColor(new Color(r.nextInt(255), r.nextInt(255), r
							.nextInt(255)));
			g.drawLine(r.nextInt(100),r.nextInt(30),r.nextInt(100),r.nextInt(30));
		}
		g.setColor(new Color((x+128)%256, (y+128)%256, (z+128)%256));
		g.setFont(new Font("Default", Font.BOLD,25));
		g.drawString(code,3,25);
		// 压缩成Jpeg格式
		OutputStream out = res.getOutputStream();
		JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
		encoder.encode(bimg);
		out.flush();
		out.close();
		return null;
	}

}