Java实现图片验证码源码

  /*

    * To change this template, choose Tools | Templates * and open the template in the editor.

    */

    package com.wind.util;

    import java.awt.BasicStroke;

    import java.awt.Color; import java.awt.Font;

    import java.awt.Graphics; import java.awt.Graphics2D;

    import java.awt.geom.AffineTransform;

    import java.awt.geom.Line2D;

    import java.awt.image.BufferedImage;

    import java.io.ByteArrayInputStream;

    import java.io.ByteArrayOutputStream;

    import java.io.IOException;

    import java.util.Random;

    import javax.imageio.ImageIO;

    import javax.imageio.stream.ImageOutputStream;

    /**

    *

    * @author zyong

    *验证码

    */

    public class CheckCode {

    /**

    *创建一个随机数对象

    */

    Random random = new Random();

    /**

    *生成的字符集

    */

    private final String character = "0ABC1DEF2GHI3JKL4MNO5PQR6ST7UV8WX9YZ";

    /**

    *返回生成后的图片字符

    */

    private String checkCode;

    /**

    * 设置生成图片的宽度,默认为65

    */

    private int width = 65;

    /**

    * 设置生成图片的高度,默认为25

    */

    private int height = 25;

    /**

    * 设置图片的类型,默认为BufferedImage.TYPE_INT_RGB

    */

    private int imageType = BufferedImage.TYPE_INT_RGB;

    /**

    *

    * @return生成图片后的字符

    */

    public String getCheckCode() {

    return checkCode;

    }

    /**

    *

    * @return图片的高度

    */

    public int getHeight() {

    return height;

    }

    /**

    *

    * @param height图片的高度

    */

    public void setHeight(int height) {

    this.height = height;

    }

    /**

    *

   * @return图片的宽度

    */

    public int getWidth() {

    return width;

    }

    /**

    *

    * @param width图片的宽度

    */

    public void setWidth(int width) {

    this.width = width;

    }

    /**

    *

    * @return图片类型

    */

    public int getImageType() {

    return imageType;

    }

    /**

    *

    * @param imageType图片类型

    */

    public void setImageType(int imageType) {

    this.imageType = imageType;

    }

    /**

    *

    * @return生成一张图片

    */

    public ByteArrayInputStream buildImage() {

    BufferedImage image = new BufferedImage(this.width, this.height, this.imageType);

    Graphics g = image.getGraphics();

    Graphics2D g2d = (Graphics2D) g;

    g.setColor(this.getColor(200, 250));

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

    g.setFont(new Font("Times New Roman", Font.BOLD, 17));

    g.setColor(this.getColor(180, 200));

    /*

    *绘制100条干扰线

    */

    for (int i = 0; i < 100; i++) {

    int x1 = random.nextInt(this.width);

    int y1 = random.nextInt(this.height);

    int x2 = random.nextInt(this.width - 3);

    int y2 = random.nextInt(this.height - 3);

    BasicStroke bs = new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL);

    Line2D line = new Line2D.Double(x1, y1, x2, y2);

    g2d.setStroke(bs);

    g2d.draw(line);

    g.setColor(getColor(180, 222));

    }

    StringBuffer codeStr = new StringBuffer();

    for (int i = 0; i < 4; i++) {

    char c = character.charAt(random.nextInt(36));

    codeStr.append(c);

    Color color = new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110));

    g.setColor(color); /*随机文字,旋转文字到指定角度*/

   AffineTransform trans = new AffineTransform();

    trans.rotate(random.nextInt(10) * i + 3, 5);

    float scaleSize = random.nextFloat() + 0.5f;

    if (scaleSize < 0.8 || scaleSize > 1.1f) {

    scaleSize = 1f;

    }

    trans.scale(scaleSize, scaleSize); g2d.setTransform(trans);

    g.drawString(String.valueOf(c), 15 * i + 6, 9);

    }

    this.checkCode = codeStr.toString(); g.dispose();

    ByteArrayInputStream inputStream = null;

    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

    try {

    ImageOutputStream imgOutput = ImageIO.createImageOutputStream(outputStream);

    ImageIO.write(image, "JPEG", imgOutput);

    imgOutput.close();

    inputStream = new ByteArrayInputStream(outputStream.toByteArray());

    outputStream.close();

    } catch (IOException e) {

    e.printStackTrace();

    }

    return inputStream;

    }

    /**

    * 利用随机数，随机生成一个Color颜色的对象

    * @param fc

    * @param bc

    * @return颜色对象

    */

    private Color getColor(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);

    }

    }

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