1.生成验证码的工具类
public class ValidateCodeUtil{
/**放到session中的key*/
public static final String RANDOMCODEKEY= "RANDOMVALIDATECODEKEY";
/**随机产生只有数字的字符串 private String*/
//private String randString = "0123456789";
/**随机产生只有字母的字符串*/
//private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
/**随机产生数字与字母组合的字符串*/
private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
/** 图片宽*/
private int width = 115;
/** 图片高*/
private int height = 35;
/**干扰线数量*/
private int lineSize = 40;
/**随机产生字符数量*/
private int stringNum = 4;
private static final Logger logger = LoggerFactory.getLogger(
ValidateCodeUtil.class);
private Random random = new Random();
/**
* 获得字体
*/
private Font getFont() {
return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
}
/**
* 获得颜色
*/
private Color getRandColor(int fc, int bc) {
if (fc > 255)
{fc = 255;}
if (bc > 255)
{ bc = 255;}
int r = fc + random.nextInt(bc - fc - 16);
int g = fc + random.nextInt(bc - fc - 14);
int b = fc + random.nextInt(bc - fc - 18);
return new Color(r, g, b);
}
/**
* 生成随机图片
*/
public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
HttpSession session = request.getSession();
// BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
Graphics g = image.getGraphics();
//图片大小
g.fillRect(0, 0, width, height);
//字体大小
g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
//字体颜色
g.setColor(getRandColor(110, 133));
// 绘制干扰线
for (int i = 0; i <= lineSize; i++) {
drowLine(g);
}
// 绘制随机字符
String randomString = "";
for (int i = 1; i <= stringNum; i++) {
randomString = drowString(g, randomString, i);
}
//将生成的随机字符串保存到session中
session.removeAttribute(RANDOMCODEKEY);
session.setAttribute(RANDOMCODEKEY, randomString);
g.dispose();
try {
// 将内存中的图片通过流动形式输出到客户端
ImageIO.write(image, "JPEG", response.getOutputStream());
} catch (Exception e) {
logger.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e);
}
}
/**
* 绘制字符串
*/
private String drowString(Graphics g, String randomString, int i) {
g.setFont(getFont());
g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
.nextInt(121)));
String rand = String.valueOf(getImgCode(random.nextInt(randString
.length())));
randomString += rand;
g.translate(random.nextInt(3), random.nextInt(3));
g.drawString(rand, 13 * i, 16);
return randomString;
}
/**
* 绘制干扰线
*/
private void drowLine(Graphics g) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(13);
int yl = random.nextInt(15);
g.drawLine(x, y, x + xl, y + yl);
}
/**
* 获取随机的字符
*/
public String getImgCode(int num) {
return String.valueOf(randString.charAt(num));
}
}
2.Controller层调用
@org.springframework.stereotype.Controller
@RequestMapping("/code")
public class Controller{
//org.slf4j.LoggerFactory
private Logger log = LoggerFactory.getLogger(this.getClass());
// 获取验证码
@RequestMapping("/getVerify")
public void getVerify(HttpServletRequest request, HttpServletResponse response) {
try {
//设置相应类型,告诉浏览器输出的内容为图片
response.setContentType("image/jpeg");
//设置响应头信息，告诉浏览器不要缓存此内容
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expire", 0);
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
ValidateCodeUtil randomValidateCode = new ValidateCodeUtil();
//输出验证码图片方法
randomValidateCode.getRandcode(request, response);
} catch (Exception e) {
log.error("获取验证码失败>>>> ", e);
}
}
}
3.调用
html:
<a href="javascript:void(0);" title="点击更换验证码">
<img src="/code/getVerify" width="95%" class="imgcode"/>
</a>
js:
$('.imgcode').click(function() {
var url = "/code/getVerify?"+ Math.random();
$(".imgcode").attr("src", url);
});
效果如图： http://localhost:8080/code/getVerify?0.3116131160655884
