java生成四位数字验证码_简单的随机生成4个数字验证码的实现

VerifyCode类：生成四个随机验证码packagecn.itcast.image;importjava.awt.BasicStroke;importjava.awt.Color;importjava.awt.Font;importjava.awt.Graphics2D;importjava.awt.image.BufferedImage;importjava.io.IOException;importjava.io.OutputStream;importjava.util.Random;importjavax.imageio.ImageIO;public classVerifyCode {private int w = 70;private int h = 35;private Random r = newRandom();//{"宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312"}

private String[] fontNames = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"};//可选字符

private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";//背景色

private Color bgColor = new Color(255, 255, 255);//验证码上的文本

privateString text ;//生成随机的颜色

privateColor randomColor () {int red = r.nextInt(150);int green = r.nextInt(150);int blue = r.nextInt(150);return newColor(red, green, blue);

}//生成随机的字体

privateFont randomFont () {int index =r.nextInt(fontNames.length);

String fontName= fontNames[index];//生成随机的字体名称

int style = r.nextInt(4);//生成随机的样式, 0(无样式), 1(粗体), 2(斜体), 3(粗体+斜体)

int size = r.nextInt(5) + 24; //生成随机字号, 24 ~ 28

return newFont(fontName, style, size);

}//画干扰线

private voiddrawLine (BufferedImage image) {int num = 3;//一共画3条

Graphics2D g2 =(Graphics2D)image.getGraphics();for(int i = 0; i < num; i++) {//生成两个点的坐标，即4个值

int x1 =r.nextInt(w);int y1 =r.nextInt(h);int x2 =r.nextInt(w);int y2 =r.nextInt(h);

g2.setStroke(new BasicStroke(1.5F));

g2.setColor(Color.BLUE);//干扰线是蓝色

g2.drawLine(x1, y1, x2, y2);//画线

}

}//随机生成一个字符

private charrandomChar () {int index =r.nextInt(codes.length());returncodes.charAt(index);

}//创建BufferedImage

privateBufferedImage createImage () {

BufferedImage image= newBufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

Graphics2D g2=(Graphics2D)image.getGraphics();

g2.setColor(this.bgColor);

g2.fillRect(0, 0, w, h);returnimage;

}//调用这个方法得到验证码

publicBufferedImage getImage () {

BufferedImage image= createImage();//创建图片缓冲区

Graphics2D g2 = (Graphics2D)image.getGraphics();//得到绘制环境

StringBuilder sb = new StringBuilder();//用来装载生成的验证码文本//向图片中画4个字符

for(int i = 0; i < 4; i++) {//循环四次，每次生成一个字符

String s = randomChar() + "";//随机生成一个字母

sb.append(s); //把字母添加到sb中

float x = i * 1.0F * w / 4; //设置当前字符的x轴坐标

g2.setFont(randomFont()); //设置随机字体

g2.setColor(randomColor()); //设置随机颜色

g2.drawString(s, x, h-5); //画图

}this.text = sb.toString(); //把生成的字符串赋给了this.text

drawLine(image); //添加干扰线

returnimage;

}//返回验证码图片上的文本

publicString getText () {returntext;

}//保存图片到指定的输出流

public static voidoutput (BufferedImage image, OutputStream out)throwsIOException {

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

}

}

调用方法

@Testpublic void demo() throwsFileNotFoundException, IOException{

VerifyCode vc= newVerifyCode();

BufferedImage bi=vc.getImage();

VerifyCode.output(bi,new FileOutputStream("F:xxx.jpg"));

System.out.println(vc.getText());

}

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