java编写简单漂亮的验证码

来源：互联网发布：墨尔本海鲜市场知乎编辑：程序博客网时间：2024/04/28 09:30
代码如下
package com.bdqn.common;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.HashSet;import java.util.Random;import java.util.Set;import javax.imageio.ImageIO;import org.apache.struts2.ServletActionContext;/** * 生成验证码 * <p>Title:RandomCodeGenerator<p> * <p>Description: </p> * <p>Company: </p> * @author 123456 * <p>yangyang</p> */public class RandomCodeGenerator {    private static final char[] CHARS = "abcdefghijkmnpqrstovwxyz0123456789".toCharArray();    private int length;    private int fontSize = 14;    private String randomCode = null;    public RandomCodeGenerator(int length) {        this.length = length;    }    public RandomCodeGenerator() {        this(4);    }    public String getRandomCode() {        if (randomCode == null) {            // 生成验证码            this.randomCode = initRandomCode();        }        return randomCode;    }    // 初始化验证码    private String initRandomCode() {        Set<Character> chars = new HashSet<>();        Random r = new Random();        while(chars.size() != length) {            chars.add(CHARS[r.nextInt(CHARS.length)]);        }        char[] cs = new char[chars.size()];        int index = 0;        for (char c : chars) {            cs[index++] = c;        }        return new String(cs).toUpperCase();    }    public BufferedImage generator(OutputStream output) throws IOException {        int width = length * (fontSize + 2) + 10;        int height = fontSize + 10;        //创建一个缓存图片对象        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);        //得到画笔对象        Graphics2D g = (Graphics2D)image.getGraphics();        //设置前景色        g.setColor(Color.PINK);        //使用前景色填充距形        g.fillRect(0, 0, width, height);        Random r = new Random();        //绘制干扰线        for(int i = 0; i < 3; i++){            //生成随机颜色            Color c = new Color(r.nextInt(256), r.nextInt(256), r.nextInt(256));            g.setColor(c);            //画线            g.drawLine(r.nextInt(width / 2), r.nextInt(height), r.nextInt(width / 2) + width / 2, r.nextInt(height));        }        g.setColor(Color.WHITE);        Font font = new Font("Cooper Std", Font.PLAIN, fontSize);        //设置字体        g.setFont(font);        if(randomCode == null)            this.randomCode = getRandomCode();        for(int i = 0; i < randomCode.length(); i++){            //画字符            g.drawString(randomCode.substring(i, i+1), 8 + fontSize * i, height / 2 + fontSize / 2);        }        //完成，并将验证码放入session中        //此处是将验证码存入session中进行验证码验证              //ServletActionContext.getRequest().getSession().setAttribute("checkCode", randomCode);        image.flush();        //输出        ImageIO.write(image, "PNG", output);        return image;    }    public int getFontSize() {        return fontSize;    }    public void setFontSize(int fontSize) {        this.fontSize = fontSize;    }    public static void main(String[] args) {        RandomCodeGenerator rcg = new RandomCodeGenerator(6);        System.out.println(rcg.getRandomCode());        try {            rcg.generator(new FileOutputStream("F:/a.png"));        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}
效果图如下：
这里写图片描述
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