一:根据java本身提供的一种验证码的写法,这种呢只限于大家了解就可以了,因为java自带的模式编写的在实际开发中是没有意义的,所以只供学习一下就可以了,待会讲解的第二种呢就是我们需要掌握的一种模式了:
import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;/** * Servlet implementation class inde */@WebServlet("/inde")public class inde extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public inde() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } /**动态生成图片验证码 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub //创建图像 int width=100; int height=40; //图片的大小设置 BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); //创建画板 Graphics g=image.getGraphics(); setSquareBackGround(g,width,height,5); //确定画笔颜色 g.setColor(Color.black); //填充矩形 g.fillRect(0, 0, width, height); //在大矩形中放小矩形 g.setColor(Color.WHITE); g.fillRect(1, 1, width-2, height-2); //填充字符 String str = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM0123456789"; StringBuffer sb=new StringBuffer(); //画随机干扰框 setSquareBackGround(g,width,height,3); //画干扰点 CreateRandomPoint(width, height,100,g,100); //随机画几条线 CreateRandomLine(width, height,8,g,100); //随机获取4个字符 Random random=new Random(); for (int i = 0; i < 4; i++) { //62个填充字符里面随机的随机的收取字符 int index=random.nextInt(62); //截取一个字符 String st=str.substring(index, index+1); //把字符放到图片中去 g.setColor(Color.red); //设置字体 g.setFont(new Font("宋体",Font.BOLD,30)); g.drawString(st, 20*i, 30);//防止4个字符在一起 sb.append(st); } //把StringBuffer中的验证码放到session里面,目的是让Login调用 HttpSession se=request.getSession(); se.setAttribute("number", sb.toString()); //发送图片到浏览器 指定发送的图片 和格式 response.setContentType("image/jpeg"); //图片,图片的格式,输出的方式 ImageIO.write(image, "jpg", response.getOutputStream()); } Random rand = new Random(); private void CreateRandomPoint(int width,int height,int many,Graphics g,int alpha) { // 随机产生干扰点 for (int i=0;i<many;i++) { int x = rand.nextInt(width); int y = rand.nextInt(height); g.setColor(getColor(alpha)); g.drawOval(x,y,rand.nextInt(3),rand.nextInt(3)); } }/** * 随机产生干扰线条 * @param width * @param height * @param minMany 最少产生的数量 * @param g * @param alpha 透明度0~255 0表示全透 */ private void CreateRandomLine(int width,int height,int minMany,Graphics g,int alpha) { // 随机产生干扰线条 for (int i=0;i<getIntRandom(minMany, minMany+6);i++) { int x1 =getIntRandom(0,(int)(width*0.6)); int y1 =getIntRandom(0,(int)(height*0.6)); int x2 =getIntRandom((int)(width*0.4),width); int y2 =getIntRandom((int)(height*0.2),height); g.setColor(getColor(alpha)); g.drawLine(x1, y1, x2, y2); } } /** * 由随机产生的方块来作为干扰背景 */ private void setSquareBackGround(Graphics g,int width,int height,int count){ // 随机产生干扰线条 for (int i=0;i<getIntRandom(count, count+2);i++) { int x1 =getIntRandom(0,(int)(width*0.3)); int y1 =getIntRandom(0,(int)(height*0.3)); int x2 =getIntRandom((int)(width*0.5),width); int y2 =getIntRandom((int)(height*0.55),height); g.setColor(getColor(100)); int w=x2-x1; int h=y2-y1; if(w<0) w=-w; if(h<0) h=-h; g.drawRect(x1, y1, w, h); g.setColor(getColor(25)); g.fillRect(x1, y1, w, h); } } private int getIntRandom(double start,double end) { if(end<start) { double t=end; end=start; start=t; } double i=start+(int) (Math.random()*(end-start)); return (int)i; }
import java.io.IOException;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;/** * Servlet implementation class inde */@WebServlet("/inde")public class inde extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public inde() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } /**动态生成图片验证码 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub //创建图像 int width=100; int height=40; //图片的大小设置 BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); //创建画板 Graphics g=image.getGraphics(); setSquareBackGround(g,width,height,5); //确定画笔颜色 g.setColor(Color.black); //填充矩形 g.fillRect(0, 0, width, height); //在大矩形中放小矩形 g.setColor(Color.WHITE); g.fillRect(1, 1, width-2, height-2); //填充字符 String str = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM0123456789"; StringBuffer sb=new StringBuffer();//随机获取4个字符 Random random=new Random(); for (int i = 0; i < 4; i++) { //62个填充字符里面随机的随机的收取字符 int index=random.nextInt(62); //截取一个字符 String st=str.substring(index, index+1); //把字符放到图片中去 g.setColor(Color.red); //设置字体 g.setFont(new Font("宋体",Font.BOLD,30)); g.drawString(st, 20*i, 30);//防止4个字符在一起 sb.append(st); }//把StringBuffer中的验证码放到session里面,目的是让Login调用 HttpSession se=request.getSession(); se.setAttribute("number", sb.toString()); //发送图片到浏览器 指定发送的图片 和格式 response.setContentType("image/jpeg"); //图片,图片的格式,输出的方式 ImageIO.write(image, "jpg", response.getOutputStream()); }
以上所述是小编给大家介绍的Java动态验证码单线设计的两种方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对VeVb武林网网站的支持!