java 工具类 验证码

java 工具类验证码

阅读原文时间：2023年07月09日阅读：2

第一步：引入工具类

工具类一：

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.Random;

import javax.imageio.ImageIO;

public class ImageCodeUtil {

public enum SecurityCodeLevel {  
    Simple, Medium, Hard  
};

public static String getSecurityCode() {  
    return getSecurityCode(4, SecurityCodeLevel.Medium, false);  
}

public static String getSecurityCode(int length, SecurityCodeLevel level, boolean isCanRepeat) {

    int len = length;

    char\[\] codes = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',  
            'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D',  
            'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y',  
            'Z' };

    if (level == SecurityCodeLevel.Simple) {  
        codes = Arrays.copyOfRange(codes, 0, 10);  
    } else if (level == SecurityCodeLevel.Medium) {  
        codes = Arrays.copyOfRange(codes, 0, 36);  
    }

    int n = codes.length;

    if (len > n && isCanRepeat == false) {  
        throw new RuntimeException(String.format(  
                "调用SecurityCode.getSecurityCode(%1$s,%2$s,%3$s)出现异常�?" + "当isCanRepeat�?%3$s时，传入参数%1$s不能大于%4$s",  
                len, level, isCanRepeat, n));  
    }

    char\[\] result = new char\[len\];

    if (isCanRepeat) {  
        for (int i = 0; i < result.length; i++) {

            int r = (int) (Math.random() \* n);

            result\[i\] = codes\[r\];  
        }  
    } else {  
        for (int i = 0; i < result.length; i++) {

            int r = (int) (Math.random() \* n);

            result\[i\] = codes\[r\];

            codes\[r\] = codes\[n - 1\];  
            n--;  
        }  
    }  
    return String.valueOf(result);  
}

public static BufferedImage createImage(String securityCode) {

    int codeLength = securityCode.length();

    int fontSize = 18;

    int fontWidth = fontSize + 1;

    int width = codeLength \* fontWidth + 6;  
    int height = fontSize \* 2 + 1;

    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE\_INT\_RGB);

    Graphics2D g = image.createGraphics();

    g.setColor(Color.WHITE);

    g.fillRect(0, 0, width, height);

    g.setColor(Color.LIGHT\_GRAY);

    g.setFont(new Font("Arial", Font.BOLD, height - 2));

    g.drawRect(0, 0, width - 1, height - 1);

    Random rand = new Random();

    g.setColor(Color.LIGHT\_GRAY);

    for (int i = 0; i < codeLength \* 6; i++) {

        int x = rand.nextInt(width);

        int y = rand.nextInt(height);

        g.drawRect(x, y, 1, 1);

    }

    int codeY = height - 10;

    g.setColor(new Color(19, 148, 246));

    g.setFont(new Font("宋体", Font.BOLD, fontSize));  
    for (int i = 0; i < codeLength; i++) {  
        double deg = new Random().nextDouble() \* 20;  
        g.rotate(Math.toRadians(deg), i \* 16 + 13, codeY - 7.5);  
        g.drawString(String.valueOf(securityCode.charAt(i)), i \* 16 + 5, codeY);  
        g.rotate(Math.toRadians(-deg), i \* 16 + 13, codeY - 7.5);  
    }

    g.dispose();

    return image;

}

public static void main(String\[\] args) throws IOException {

    String securityCode = getSecurityCode();

    System.out.println("====" + securityCode);

    BufferedImage image = createImage(securityCode);

    ImageIO.write(image, "png", new FileOutputStream(new File("D:\\\\4.png")));  
}

}

ImageCodeUtil

工具类二：

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;

public class VerifyCodeUtil {
public static final String VERIFY_CODES = "23456789ABCDEFGHJKMNPQRSTUVWXYZabcdefghjkmnpqrstuvwxyz";
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 BufferedImage getImage(int w, int h, String code) {  
    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();  
    return image;  
}

public static void outputImage(int w, int h, OutputStream os, String code) throws IOException {  
    BufferedImage image = getImage(w, h, code);  
    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; // 50;

    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 {

    String generateVerifyCode = generateVerifyCode(4);

    System.out.println(generateVerifyCode);

    BufferedImage image = getImage(255, 80, generateVerifyCode);

    ImageIO.write(image, "png", new FileOutputStream(new File("D:\\\\1.png")));  
}

}

VerifyCodeUtil

第二步：前台页面和 js 代码

换张图

                                            <span  
                                            id="spn\_vcode\_ok" class="icon\_yes pin\_i"  
                                            style="display: none;"></span> <span id="J\_tipVcode"  
                                            class="cue warn"></span>  
                                </div>

代码

js 代码

//验证码  
$("#vcodeImgBtn").click(function() {  
    $("#imgVcode").attr("src","/DangDang\_zln/code/captcher?a="+new Date().getTime());  
  });

 $("#vcodeImgWrap").click(function() {  
     $("#imgVcode").attr("src","/DangDang\_zln/code/captcher?a="+new Date().getTime());

第三步：验证码action 类页面访问的地址就是这个类

public String Captcher() {

    String code = VerifyCodeUtil.generateVerifyCode(4);  
    HttpSession session = ServletActionContext.getRequest().getSession();  
    System.out.println(code);  
    session.setAttribute("mycode", code);

    BufferedImage image = VerifyCodeUtil.getImage(255, 80, code);

    ServletActionContext.getRequest().getSession().setAttribute("code", code);

    HttpServletResponse response = ServletActionContext.getResponse();

    response.setContentType("image/png");  
    try {  
        ImageIO.write(image, "png", response.getOutputStream());  
    } catch (IOException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
    }  
    return Action.NONE;

}

验证码

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