validateimageaction.java

一个汽车售后服务站的典型的进销管理系统,B/S模式的

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.xfaccp.struts.action.emp;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

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


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;



/** 
 * MyEclipse Struts
 * Creation date: 11-01-2007
 * 
 * XDoclet definition:
 * @struts.action validate="true"
 */
public class ValidateImageAction extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	
	 private Font mFont=new Font("Times New Roman", Font.PLAIN,18);//设置字体
	 private int width=60;
	 private int height=20;
	
	/*这是验证码的另一种方法，不知道怎么用
	 * 作者：周云*/
	 
	 
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		System.out.print("++++++++++++++++++++++");
		try{
	
			  ServletOutputStream out=response.getOutputStream();
			  BufferedImage bfImage=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
			  Graphics g=bfImage.getGraphics();
			  //画图片的背景
			  g.setColor(randColor(200,250));
			  g.fillRect(0,0,width,height);
			  //画图片的边框
			  g.setColor(new Color(0));
			  g.drawRect(0,0,width-1,height-1);
			  //画干扰线
			  
			  Random rand=new Random();
			  for(int i=0;i<155;i++)
			  {g.setColor(randColor(160,200));
			   int x=rand.nextInt(width);
			   int y=rand.nextInt(height);
			   int xend=rand.nextInt(12);
			   int yend=rand.nextInt(12);
			   g.drawLine(x,y,x+xend,y+yend);
			  }
			  //画验证码
			  g.setFont(mFont);
			  String num="";
			  for(int i=0;i<4;i++)
			  {
			   String n=String.valueOf(rand.nextInt(10));
			   g.setColor(new Color(rand.nextInt(255),rand.nextInt(255),rand.nextInt(255)));
			   g.drawString(n,13*i+6,16);
			   num+=n;
			  }
			 // HttpSession session=request.getSession();
			  //session.setAttribute("vaildataImage",num);
			  
			  JPEGImageEncoder jpegCoder=JPEGCodec.createJPEGEncoder(out);
			  jpegCoder.encode(bfImage);
			  out.close();
			  
			 /* 这个Session到底要传什么，才能在登录页面显示验证码？*/
			  //session.setAttribute("vaildate",bfImage);
               
			  return mapping.findForward("login");
		}catch(Exception e){
			e.printStackTrace();
			return mapping.findForward("error");
		}
	}
	
	 public Color randColor(int fc,int bc)
	 {
	  fc=fc>255?255:fc;
	  bc=bc>255?255:bc;
	  
	  Random rand=new Random();
	  int r=fc+rand.nextInt(bc-fc);
	  int g=fc+rand.nextInt(bc-fc);
	  int b=fc+rand.nextInt(bc-fc);
	  Color c=new Color(r,g,b);
	  return c;
	 }

}