在javaweb项目中添加验证码并进行验证

生成图片的代码

package cn.itcast.uitil;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;
 
import javax.imageio.ImageIO;
/**
 * 验证码
 */
public class VerifyCodeUtils{
     
    public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
    private static Random random = new Random();
 
 
    public static String generateVerifyCode(int verifySize){
        return generateVerifyCode(verifySize, VERIFY_CODES);
    }
    
    public static String generateVerifyCode(int verifySize, String sources){
        if(sources == null || sources.length() == 0){
            sources = VERIFY_CODES;
        }
        int codesLen = sources.length();
        Random rand = new Random(System.currentTimeMillis());
        StringBuilder verifyCode = new StringBuilder(verifySize);
        for(int i = 0; i < verifySize; i++){
            verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));
        }
        return verifyCode.toString();
    }
     
    public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{
        String verifyCode = generateVerifyCode(verifySize);
        outputImage(w, h, outputFile, verifyCode);
        return verifyCode;
    }
     
    public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{
        String verifyCode = generateVerifyCode(verifySize);
        outputImage(w, h, os, verifyCode);
        return verifyCode;
    }
     
    public static void outputImage(int w, int h, File outputFile, String code) throws IOException{
        if(outputFile == null){
            return;
        }
        File dir = outputFile.getParentFile();
        if(!dir.exists()){
            dir.mkdirs();
        }
        try{
            outputFile.createNewFile();
            FileOutputStream fos = new FileOutputStream(outputFile);
            outputImage(w, h, fos, code);
            fos.close();
        } catch(IOException e){
            throw e;
        }
    }
     
    public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{
        int verifySize = code.length();
        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Random rand = new Random();
        Graphics2D g2 = image.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
        Color[] colors = new Color[5];
        Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,
                Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
                Color.PINK, Color.YELLOW };
        float[] fractions = new float[colors.length];
        for(int i = 0; i < colors.length; i++){
            colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
            fractions[i] = rand.nextFloat();
        }
        Arrays.sort(fractions);
         
        g2.setColor(Color.GRAY);
        g2.fillRect(0, 0, w, h);
         
        Color c = getRandColor(200, 250);
        g2.setColor(c);
        g2.fillRect(0, 2, w, h-4);
         
        
        Random random = new Random();
        g2.setColor(getRandColor(160, 200));
        for (int i = 0; i < 20; i++) {
            int x = random.nextInt(w - 1);
            int y = random.nextInt(h - 1);
            int xl = random.nextInt(6) + 1;
            int yl = random.nextInt(12) + 1;
            g2.drawLine(x, y, x + xl + 40, y + yl + 20);
        }
         
        
        float yawpRate = 0.05f;
        int area = (int) (yawpRate * w * h);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(w);
            int y = random.nextInt(h);
            int rgb = getRandomIntColor();
            image.setRGB(x, y, rgb);
        }
         
        shear(g2, w, h, c);
 
        g2.setColor(getRandColor(100, 160));
        int fontSize = h-4;
        Font font = new Font("Algerian", Font.ITALIC, fontSize);
        g2.setFont(font);
        char[] chars = code.toCharArray();
        for(int i = 0; i < verifySize; i++){
            AffineTransform affine = new AffineTransform();
            affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);
            g2.setTransform(affine);
            g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);
        }
         
        g2.dispose();
        ImageIO.write(image, "jpg", os);
    }
     
    private static Color getRandColor(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);
    }
     
    private static int getRandomIntColor() {
        int[] rgb = getRandomRgb();
        int color = 0;
        for (int c : rgb) {
            color = color << 8;
            color = color | c;
        }
        return color;
    }
     
    private static int[] getRandomRgb() {
        int[] rgb = new int[3];
        for (int i = 0; i < 3; i++) {
            rgb[i] = random.nextInt(255);
        }
        return rgb;
    }
 
    private static void shear(Graphics g, int w1, int h1, Color color) {
        shearX(g, w1, h1, color);
        shearY(g, w1, h1, color);
    }
     
    private static void shearX(Graphics g, int w1, int h1, Color color) {
 
        int period = random.nextInt(2);
 
        boolean borderGap = true;
        int frames = 1;
        int phase = random.nextInt(2);
 
        for (int i = 0; i < h1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                            + (6.2831853071795862D * (double) phase)
                            / (double) frames);
            g.copyArea(0, i, w1, 1, (int) d, 0);
            if (borderGap) {
                g.setColor(color);
                g.drawLine((int) d, i, 0, i);
                g.drawLine((int) d + w1, i, w1, i);
            }
        }
 
    }
 
    private static void shearY(Graphics g, int w1, int h1, Color color) {
 
        int period = random.nextInt(40) + 10; 
 
        boolean borderGap = true;
        int frames = 20;
        int phase = 7;
        for (int i = 0; i < w1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                            + (6.2831853071795862D * (double) phase)
                            / (double) frames);
            g.copyArea(i, 0, 1, h1, 0, (int) d);
            if (borderGap) {
                g.setColor(color);
                g.drawLine(i, (int) d, i, 0);
                g.drawLine(i, (int) d + h1, i, h1);
            }
 
        }
 
    }
    public static void main(String[] args) throws IOException{
    	// 定义图片目录
        File dir = new File("d:/verifies");
        // 定义图片大小
        int w = 200, h = 80;
        // 生成 50 个验证码图片
        for(int i = 0; i < 50; i++){
        	// 随机生成验证码
            String verifyCode = generateVerifyCode(4);
            // 生成图片文件
            File file = new File(dir, verifyCode + ".jpg");
            // 输出图片
            outputImage(w, h, file, verifyCode);
        }
        
       
    }
}

 

VerifyCodeUtils.java文件的代码中你只需要知道其图片或自动存放在d:/verifies目录下

在javaweb项目中添加验证码并进行验证_第1张图片

Servlet动态获取验证码代码

package cn.itcast.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.itcast.uitil.VerifyCodeUtils;

@WebServlet("/vcode.s")
public class VcodeSelvlet extends BasicServlet {

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		 /**
         * 页面中图片的设置
         * 
         * Servlet动态获取验证码
         */
        // 定义图片大小
		int w = 200, h = 80;
		// 随机生成验证码
		String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
		// 将验证码添加到会话中,注意:在会话中保存的验证码的名称 vscode
		request.getSession().setAttribute("vscode", verifyCode);
		// 图形写给浏览器  
		response.setContentType("image/jpeg");
		// 发头控制浏览器不要缓存  
		response.setDateHeader("expries", -1);
		response.setHeader("Cache-Control", "no-cache");
		response.setHeader("Pragma", "no-cache");
		// 输出图片
		VerifyCodeUtils.outputImage(w, h, response.getOutputStream(),
				verifyCode);
        
	}
}

VcodeSelvlet.java文件中你只需要知道  VcodeSelvlet的映射地址为vcode.s,在会话中保存的验证码的名称 vscode。

在jsp中操作验证码的部分代码


                

      src="vcode.s";是指其图片的路径从VcodeSelvlet中获取

     οnclick='src="vcode.s?"+new Date()' ;是指根据点击事件根据时间的不同从而动态获取不同的图片。从而起到每点击一次获取不同的验证码效果

在Servlet中比较jsp界面上验证码是否输入正确

String vcode = request.getParameter("vcode");//获取输入框中的值
String cscode = (String) request.getSession().getAttribute("vscode");//获取图片上验证码的值
//不区分大小写
if(vcode.equalsIgnoreCase(cscode)){
    System.out.println("您的值与验证码的值一致");
}else{
    System.out.println("您的值与验证码的值不一致");
}

 String cscode = (String) request.getSession().getAttribute("vscode");//获取图片上验证码的值。

  在前面说过在会话中保存的验证码的名称 vscode。所以可以通过 (String) request.getSession().getAttribute("vscode");来获取验证码的值。

 

你可能感兴趣的:(javaweb)