spring mvc的服务器端图形验证码

Spring mvc 的服务器端图形验证码～～

如下代码是我将图形验证码的代码用spring mvc写了一下

非常不错的基础图形验证码～

－－－－－－－－－－－－－－－－－－－－－－－

@RestController

@RequestMapping("")

public class ImgCodeController {

@Autowired

RedisTemplate<String,String> cache;

private int width = 90;//定义图片的width

private int height = 30;//定义图片的height

private int codeCount = 4;//定义图片上显示验证码的个数

private int xx = 15;

private int fontHeight = 18;

private int codeY = 16;

char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',

'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',

'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

@RequestMapping("/checkCode")

protected void doGetCode(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws IOException {

//设置页面不缓存

httpServletResponse.setHeader("Pragma", "No-cache");

httpServletResponse.setHeader("Cache-Control", "no-cache");

httpServletResponse.setDateHeader("Expires", 0);

httpServletResponse.setContentType("image/jpeg");

// 在内存中创建图象

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

// 获取图形上下文

Graphics g = image.getGraphics();

// 创建一个随机数生成器类

Random random = new Random();

// 将图像填充为白色

g.setColor(getRandColor(200, 250));

g.fillRect(0, 0, width, height);

//设定字体

g.setFont(new Font("Times New Roman", Font.PLAIN, fontHeight));

//画边框

g.setColor(new Color(20,20,20));

g.drawRect(0, 0, width - 1, height - 1);

// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到

g.setColor(getRandColor(160, 200));

for (int i = 0; i < 155; i++) {

int x = random.nextInt(width);

int y = random.nextInt(height);

int xl = random.nextInt(12);

int yl = random.nextInt(12);

g.drawLine(x,y,x+xl,y+yl);

}

// randomCode用于保存随机产生的验证码，以便用户登录后进行验证。

StringBuffer randomCode = new StringBuffer();

int red = 0, green = 0, blue = 0;

// 随机产生codeCount数字的验证码。

for (int i = 0; i < codeCount; i++) {

// 得到随机产生的验证码数字。

String code = String.valueOf(codeSequence[random.nextInt(36)]);

// 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。

red = 20 + random.nextInt(110);

green = 20 + random.nextInt(110);

blue = 20 + random.nextInt(110);

// 用随机产生的颜色将验证码绘制到图像中。

g.setColor(new Color(red, green, blue));

g.drawString(code, (i + 1) * xx, codeY);

// 将产生的四个随机数组合在一起。

randomCode.append(code);

}

// 将四位数字的验证码保存到Session中。

HttpSession session = httpServletRequest.getSession();

// 图象生效

g.dispose();

session.setAttribute("code", randomCode.toString());

// 将图像输出到Servlet输出流中。

ServletOutputStream sos = httpServletResponse.getOutputStream();

ImageIO.write(image, "jpeg", sos);

sos.close();

}

/**

* 获取随机颜色

* @param fc

* @param bc

* @return

*/

private Color getRandColor(int fc,int bc) {

Random random = new Random();

if(fc > 255) {

fc = 255;

}

if(bc > 255) {

bc = 255;

}

int r = fc + random.nextInt(bc - fc);

int g = fc + random.nextInt(bc - fc);

int b = fc + random.nextInt(bc - fc);

return new Color(r, g, b);

}

public int getWidth() {

return width;

}

public void setWidth(int width) {

this.width = width;

}

public int getHeight() {

return height;

}

public void setHeight(int height) {

this.height = height;

}

public int getCodeCount() {

return codeCount;

}

public void setCodeCount(int codeCount) {

this.codeCount = codeCount;

}

public int getXx() {

return xx;

}

public void setXx(int xx) {

this.xx = xx;

}

public int getFontHeight() {

return fontHeight;

}

public void setFontHeight(int fontHeight) {

this.fontHeight = fontHeight;

}

public int getCodeY() {

return codeY;

}

public void setCodeY(int codeY) {

this.codeY = codeY;

}

}