imagecodeservlet.java

电信运营系统代码,功能齐全,结合struts1.2+hibernate+tiles框架进行开发.

/*
 * 类名：ImageServlet
 * 作用：完成附加码图象的输出。
 * 日期：
 * 作者：
 * */
package global;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;

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

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

public class ImageCodeServlet extends HttpServlet {
	private int width=57;//图像宽度
	private int height=21;//图像高度
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		//定义输出格式
		response.setContentType("image/jpeg");
		ServletOutputStream out=response.getOutputStream();
		//准备缓冲图像,不支持表单
		BufferedImage	bimg=new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
		Random r=new Random();
		//获取图形上下文环境
		Graphics gc=bimg.getGraphics();
		//设定背景色并进行填充
		gc.setColor(getRandColor(200, 250));
		gc.fillRect(0, 0, width, height);
		//设置图形上下文环境字体
		gc.setFont(new Font("Times New Roman",Font.PLAIN,18));
		//随机产生200条干扰线条，使图像中的认证码不易被其他分析程序探测到
		gc.setColor(getRandColor(160, 200));
		for(int i=0;i<200;i++){
			int x1=r.nextInt(width);
			int y1=r.nextInt(height);
			int x2=r.nextInt(15);
			int y2=r.nextInt(15);
			gc.drawLine(x1, y1, x1+x2, y1+y2);
		}
		//随机产生100个干扰点，使图像中的验证码不易被其他分析程序探测到
		gc.setColor(getRandColor(120, 240));
		for(int i=0;i<100;i++){
			int x=r.nextInt(width);
			int y=r.nextInt(height);
			gc.drawOval(x, y, 0, 0);
		}
		
		//随机产生4个数字的验证码
		String rs="";
		String rn="";
		for(int i=0;i<4;i++){
			rn=String.valueOf(r.nextInt(10));
			rs+=rn;
			gc.setColor(new Color(20+r.nextInt(110),20+r.nextInt(110),20+r.nextInt(110)));
			gc.drawString(rn, 13*i+1, 16);
		}
		//释放图形上下文环境
		gc.dispose();
		
//		if(request.getSession().getAttribute("hk_verify")!=null || request.getSession().getAttribute("hk_verify")!=""){
//			request.getSession().setAttribute("hk_verify", null);
//			request.getSession().removeAttribute("hk_verify");
//		}
		request.getSession().setAttribute("img", rs);
		JPEGImageEncoder codee=JPEGCodec.createJPEGEncoder(out);
		codee.encode(bimg);
		out.flush();
		out.close();
	}
	public Color getRandColor(int fc,int bc){
		Random r=new Random();
		if(fc>255) fc=255;
		if(bc>255) bc=255;
		int red=fc+r.nextInt(bc-fc);//红
		int green=fc+r.nextInt(bc-fc);//绿
		int blue=fc+r.nextInt(bc-fc);//蓝
		return new Color(red,green,blue);
	}
	public void init() throws ServletException {
		// Put your code here
	}

}