JSP中彩色验证码 注册验证码 中文验证码 图片验证码的生成

JSP彩色验证码的实现 来源MSDN:ghost1392 import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class ImageServlet extends HttpServlet { // 验证码图片的宽度。 private int width=60; //验证码图片的高度。 private int height=20; protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, java.io.IOException { BufferedImage buffimg=new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB); Graphics2D g=buffimg.createGraphics(); //创建一个随机数生成器类。 Random random=new Random(); g.setColor(Color.white); g.fillRect(0,0,width,height); //创建字体，字体的大小应该根据图片的高度来定。 Font font=new Font("times new roman",Font.PLAIN,18); //设置字体。 g.setFont(font); //画边框。 g.setColor(Color.black); g.drawRect(0,0,width-1,height-1); //随机产生160条干扰线，使图象中的认证码不易被其它程序探测到。 g.setColor(Color.gray); for (int i=0;i<10;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); } //randomcode用于保存随机产生的验证码，以便用户登录后进行验证。 StringBuffer randomcode=new StringBuffer(); int red=0,green=0,blue=0; //随机产生4位数字的验证码。 for (int i=0;i<4;i++) { //得到随机产生的验证码数字。 String strrand=String.valueOf(random.nextInt(10)); //产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。 red=random.nextInt(200); green=random.nextInt(200); blue=random.nextInt(200); //产生随机高度 13至height之间 float imght = 0; while(imght<=12){ imght = Float.parseFloat(String.valueOf(random.nextInt(height))); } //用随机产生的颜色将验证码绘制到图像中。 g.setColor(new Color(red,green,blue)); g.drawString(strrand,13*i+6,imght); //将产生的四个随机数组合在一起。 randomcode.append(strrand); } //将四位数字的验证码保存到session中。 HttpSession session=req.getSession(); session.setAttribute("VerifyCode",randomcode.toString()); //禁止图像缓存。 resp.setHeader("pragma","no-cache"); resp.setHeader("cache-control","no-cache"); resp.setDateHeader("expires", 0); resp.setContentType("image/jpeg"); //将图像输出到servlet输出流中。 ServletOutputStream sos=resp.getOutputStream(); ImageIO.write(buffimg, "jpeg",sos); sos.close(); } } ------------------------------------------------------------------------------------- ==================================================================================================== jsp注册验证码的生成 image.jsp(用来生成验证码)，数字验证码 <%@ page contentType="image/jpeg" import="java.awt.*, java.awt.image.*,java.util.*,javax.imageio.*" pageEncoding="UTF-8"%> <%@ page import="java.io.OutputStream" %> <%! Color getRandColor(int fc,int bc){ 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); } %> <% try{ response.setHeader("Pragma","No-cache"); response.setHeader("Cache-Control","no-cache"); response.setDateHeader("Expires", 0); int width=60, height=20; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); OutputStream os=response.getOutputStream(); Graphics g = image.getGraphics(); Random random = new Random(); g.setColor(getRandColor(200,250)); g.fillRect(0, 0, width, height); g.setFont(new Font("Times New Roman",Font.PLAIN,18)); g.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); 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); } session.setAttribute("code",sRand); g.dispose(); ImageIO.write(image, "JPEG",os); os.flush(); os.close(); os=null; response.flushBuffer(); out.clear(); out = pageContext.pushBody(); } catch(IllegalStateException e) { System.out.println(e.getMessage()); e.printStackTrace(); }%> －－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－ image.jsp(生成中文验证码) <%@page contentType="image/jpeg" pageEncoding="UTF-8" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%> <%! //生成随机颜色 Color getRandColor(Random random, int fc, int bc) { 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); } %> <% //设置页面不缓存 response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); // 设置图片的长宽 int width = 176, height = 30; //设置备选汉字，剔除一些不雅的汉字 String base = "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