常用類(lèi)

public class VerifyCode {
private int      w         = 70;
private int      h         = 35;
private Random   r         = new Random();
// {"宋體", "華文楷體", "黑體", "華文新魏", "華文隸書(shū)", "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(yàn)證碼上的文本
private String   text ;

// 生成隨機(jī)的顏色
private Color randomColor () {
    int red = r.nextInt(150);
    int green = r.nextInt(150);
    int blue = r.nextInt(150);
    return new Color(red, green, blue);
}

// 生成隨機(jī)的字體
private Font randomFont () {
    int index = r.nextInt(fontNames.length);
    String fontName = fontNames[index];//生成隨機(jī)的字體名稱(chēng)
    int style = r.nextInt(4);//生成隨機(jī)的樣式, 0(無(wú)樣式), 1(粗體), 2(斜體), 3(粗體+斜體)
    int size = r.nextInt(5) + 24; //生成隨機(jī)字號(hào), 24 ~ 28
    return new Font(fontName, style, size);
}

// 畫(huà)干擾線(xiàn)
private void drawLine (BufferedImage image) {
    int num  = 4;//一共畫(huà)3條
    Graphics2D g2 = (Graphics2D)image.getGraphics();
    for(int i = 0; i < num; i++) {//生成兩個(gè)點(diǎn)的坐標(biāo)竹捉，即4個(gè)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(xiàn)是藍(lán)色
        g2.drawLine(x1, y1, x2, y2);//畫(huà)線(xiàn)
    }
}

// 隨機(jī)生成一個(gè)字符
private char randomChar () {
    int index = r.nextInt(codes.length());
    return codes.charAt(index);
}

// 創(chuàng)建BufferedImage
private BufferedImage createImage () {
    BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
    Graphics2D g2 = (Graphics2D)image.getGraphics();
    g2.setColor(this.bgColor);
    g2.fillRect(0, 0, w, h);
    return image;
}

// 調(diào)用這個(gè)方法得到驗(yàn)證碼
public BufferedImage 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(lái)裝載生成的驗(yàn)證碼文本
    // 向圖片中畫(huà)4個(gè)字符
    for(int i = 0; i < 4; i++)  {//循環(huán)四次句柠，每次生成一個(gè)字符
        String s = randomChar() + "";//隨機(jī)生成一個(gè)字母
        sb.append(s); //把字母添加到sb中
        float x = i * 1.0F * w / 4; //設(shè)置當(dāng)前字符的x軸坐標(biāo)
        g2.setFont(randomFont()); //設(shè)置隨機(jī)字體
        g2.setColor(randomColor()); //設(shè)置隨機(jī)顏色
        g2.drawString(s, x, h-5); //畫(huà)圖
    }
    this.text = sb.toString(); //把生成的字符串賦給了this.text
    drawLine(image); //添加干擾線(xiàn)
    return image;
}

// 返回驗(yàn)證碼圖片上的文本
public String getText () {
    return text;
}

// 保存圖片到指定的輸出流
public static void output (BufferedImage image, OutputStream out)
        throws IOException {
    ImageIO.write(image, "JPEG", out);
}

測(cè)試

@Test
public void fun2() throws FileNotFoundException, IOException {
    VerifyCode vc = new VerifyCode();
    BufferedImage bi = vc.getImage();
    VerifyCode.output(bi, new FileOutputStream("F:/xxx.jpg"));
    
    System.out.println(vc.getText());
}