VerifyCode類：生成四個隨機驗證碼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();//{"宋體", "華文楷體", "黑體", "華文新魏", "華文隸書", "微軟雅黑", "楷體_GB2312"}

private String[] fontNames = {"宋體", "華文楷體", "黑體", "微軟雅黑", "楷體_GB2312"};//可選字符

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

private Color bgColor = new Color(255, 255, 255);//驗證碼上的文本

privateString text ;//生成隨機的顏色

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

}//生成隨機的字體

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

String fontName= fontNames[index];//生成隨機的字體名稱

int style = r.nextInt(4);//生成隨機的樣式, 0(無樣式), 1(粗體), 2(斜體), 3(粗體+斜體)

int size = r.nextInt(5) + 24; //生成隨機字號, 24 ~ 28

return newFont(fontName, style, size);

}//畫干擾線

private voiddrawLine (BufferedImage image) {int num = 3;//一共畫3條

Graphics2D g2 =(Graphics2D)image.getGraphics();for(int i = 0; i < num; i++) {//生成兩個點的坐標，即4個值

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);//干擾線是藍色

g2.drawLine(x1, y1, x2, y2);//畫線

}

}//隨機生成一個字符

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

}//創(chuàng)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;

}//調用這個方法得到驗證碼

publicBufferedImage getImage () {

BufferedImage image= createImage();//創(chuàng)建圖片緩沖區(qū)

Graphics2D g2 = (Graphics2D)image.getGraphics();//得到繪制環(huán)境

StringBuilder sb = new StringBuilder();//用來裝載生成的驗證碼文本//向圖片中畫4個字符

for(int i = 0; i < 4; i++) {//循環(huán)四次，每次生成一個字符

String s = randomChar() + "";//隨機生成一個字母

sb.append(s); //把字母添加到sb中

float x = i * 1.0F * w / 4; //設置當前字符的x軸坐標

g2.setFont(randomFont()); //設置隨機字體

g2.setColor(randomColor()); //設置隨機顏色

g2.drawString(s, x, h-5); //畫圖

}this.text = sb.toString(); //把生成的字符串賦給了this.text

drawLine(image); //添加干擾線

returnimage;

}//返回驗證碼圖片上的文本

publicString getText () {returntext;

}//保存圖片到指定的輸出流

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

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

}

}

調用方法

@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());

}

總結

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