vimage.java

网上商城源码,功能包括商品管理,订单管理,用户管理等

package com.shop.common;

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

import javax.servlet.*;

import javax.servlet.http.*;

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

public class VImage extends HttpServlet {

	private Font mFont = new Font("Times New Roman", Font.PLAIN, 18); // 设置字体

	public VImage() {
		super();
	}

	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("image/jpeg");

		response.setContentType("image/gif");
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		HttpSession session=request.getSession();
		int width = 60, height = 20;

		ServletOutputStream out = response.getOutputStream();
		BufferedImage image = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB); // 设置图片大小的
		Graphics gra = image.getGraphics();
		Random random = new Random();

		gra.setColor(getRandColor(200, 250)); // 设置背景色
		gra.fillRect(0, 0, width, height);

		gra.setColor(Color.black); // 设置字体色
		gra.setFont(mFont);

		/*
		 * gra.setColor(new Color(0)); gra.drawRect(0,0,width-1,height-1);
		 */

		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
		gra.setColor(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);
			gra.drawLine(x, y, x + xl, y + yl);
		}

		// 取随机产生的认证码(4位数字)
		String sRand = "";
		for (int i = 0; i < 4; i++) {
			String rand = String.valueOf(random.nextInt(10));
			sRand += rand;
			// 将认证码显示到图象中
			gra.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110))); // 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
			gra.drawString(rand, 13 * i + 6, 16);
		}
		session.setAttribute("verify",sRand);
	
		// System.out.println("showimage="+sRand);
		// session.setAttribute("getImg", sRand);
		JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
		encoder.encode(image);
		out.close();

	}

	static Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

	/*
	 * Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色 Random random = new
	 * Random(); if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc *
	 * random.nextInt(bc - fc); int g = fc * random.nextInt(bc - fc); int b = fc *
	 * random.nextInt(bc - fc); return new Color(r, g, b); }
	 */

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();

		out.flush();
		out.close();
	}

	public void init(ServletConfig conf) throws ServletException {
		super.init(conf);
	}

}