JAVA生成图片验证码API

来源：互联网发布：照片换服装软件编辑：程序博客网时间：2024/05/30 05:10

效果图:

/** * 生成JPG格式的图片验证验证码,存入图片缓冲区BufferedImage * * @author YangBin */import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.FileOutputStream;import java.io.IOException;import java.util.Random;class CodeImage {      private int height = 35;    private int width = 70;    private int num = 4;    private int fontSize = 15;    private StringBuilder sb = new StringBuilder();    private String[] fontName = {"宋体","华文楷体","黑体","微软雅黑"};    Random rd = new Random();        /**      * @return 获取当前二维码图片的长度     */    public int getWidth() {        return width;    }    /**     * @param 设置二维码图片的长度     */    public void setWidth(int width) {        this.width = width;    }    /**      * @return 获取当前二维码图片的高度     */    public int getHeight() {        return height;    }    /**     * @param heigh 设置二维码图片的高度     */    public void setHeight(int height) {        this.height = height;    }    /**     * @return 返回二维码字符个数     */    public int getNum() {        return num;    }    /**     * @param num 设置二维码的字符个数.     */    public void setNum(int num) {        this.num = num;    }    /**     * @return 当前二维码字体的大小     */    public int getFontSize() {        return fontSize;    }    /**     * @param 获取二维码字体大小     */    public void setFontSize(int fontSize) {        this.fontSize = fontSize;    }    /**     * @return 返回当前生成的二维码的内容     */    public String getText(){        return sb.toString();    }        /**       * @return 返回一个图片缓冲区对象 BufferedImage 包含了绘制完成的图片.     */    public BufferedImage getBufferedImage () {        BufferedImage bi = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);        Graphics2D g = (Graphics2D)bi.getGraphics();        g.setColor(Color.WHITE);        g.fillRect(0, 0, width, height);        sb.delete(0, num);        for(int i=0;i<num;i++ ){            g.setColor(getColor());            g.setFont(getFont());            randomLine(g);            String s = getStr();            sb.append(s);            g.drawString(s, i*(width/num), height/2+rd.nextInt(height/2));        }        return bi;    }        /**     * @return 一个随机颜色的Color     */    public Color getColor() {               return new Color(rd.nextInt(255),rd.nextInt(255),rd.nextInt(255));    }        /**     * @return 一个随记的数字或者字母     */    public String getStr() {        String s = "23456789abcdefghigkmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";        String ch = String.valueOf(s.charAt(rd.nextInt(s.length())));        return ch;    }        /**     * 绘制一条任意的线     * @param 画笔对象     */    public void randomLine(Graphics2D g) {        int ax = rd.nextInt(width), ay = rd.nextInt(height);        int bx = rd.nextInt(width), by = rd.nextInt(height);        g.drawLine(ax, ay, bx, by);    }        /**     * @return 返回一个字体大小和字体随记.     */    public Font getFont() {         return new Font(fontName[rd.nextInt(fontName.length)],rd.nextInt(4),rd.nextInt(10)+fontSize);    }}

测试:将生成的图片写入的本地磁盘

public class CreatImage {/* * 创建图片; */public static void main(String[] args) {/* *  Image / ImageIo / BufferedImage / Icon / ImageIcon */CodeImage c = new CodeImage();BufferedImage bi = c.getBufferedImage();System.out.println(c.getText());try {ImageIO.write(bi, "JPG", new FileOutputStream("E:/abc.jpg"));} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} }}

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