话不多说先上代码
public class VerCodeServlet extends HttpServlet {
private static final long serialVersionUID = 5126616339795936447L;
private ConfigurableCaptchaService configurableCaptchaService = null;
private RandomFontFactory fontFactory = null;
private RandomWordFactory wordFactory = null;
private TextRenderer textRenderer = null;
public VerCodeServlet() {
super();
}
/**
* doGet
*/
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* doPost 输出图片流
*/
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Dto inDto =Dtos.newInDto(request); //WebCxt.getParamAsDto(request);
doConfig(inDto); // 需要动态配置的参数
response.setContentType("image/png");
response.setHeader("Cache-Control", "private, no-store, no-cache, must-revalidate"); // HTTP
response.setHeader("Pragma", "no-cache"); // HTTP 1.0
OutputStream outputStream = response.getOutputStream();
// 得到验证码对象,有验证码图片和验证码字符串
Captcha captcha = configurableCaptchaService.getCaptcha();
// 取得验证码字符串放入Session
String verificationCode = captcha.getChallenge();
request.getSession().setAttribute(Constant.VERCODE, verificationCode);
//JedisUtil.setString(inDto.getString("uuid"), verificationCode, 5 * 60);
// 取得验证码图片并输出
BufferedImage bufferedImage = captcha.getImage();
ImageIO.write(bufferedImage, "png", outputStream);
outputStream.flush();
outputStream.close();
}
/**
* 需要动态配置的参数
*/
private void doConfig(Dto inDto) {
// 随机字体生成器
fontFactory = new RandomFontFactory();
int fontSize = 25;
if (AOSUtils.isNotEmpty(inDto.getString("fontSize"))) {
fontSize = new Integer(inDto.getString("fontSize")).intValue();
}
fontFactory.setMaxSize(fontSize);
fontFactory.setMinSize(fontSize);
configurableCaptchaService.setFontFactory(fontFactory);
// 随机字符生成器,去除掉容易混淆的字母和数字,如o和0等
wordFactory = new RandomWordFactory();
String characters = "abcdefhkty2345678";
if (AOSUtils.isNotEmpty(inDto.getString("characters"))) {
characters = inDto.getString("characters");
}
wordFactory.setCharacters(characters);
Integer length = Integer.valueOf(4);
if (AOSUtils.isNotEmpty(inDto.getString("length"))) {
length = Integer.valueOf((inDto.getString("length")));
}
wordFactory.setMaxLength(length);
wordFactory.setMinLength(length);
configurableCaptchaService.setWordFactory(wordFactory);
// 验证码图片的大小
Integer width = Integer.valueOf(100);
if (AOSUtils.isNotEmpty(inDto.getString("width"))) {
width = Integer.valueOf((inDto.getString("width")));
}
Integer height = Integer.valueOf(40);
if (AOSUtils.isNotEmpty(inDto.getString("height"))) {
height = Integer.valueOf((inDto.getString("height")));
}
configurableCaptchaService.setWidth(width);
configurableCaptchaService.setHeight(height);
}
/**
* Servlet初始化方法：只会初始化一次。如果要做相关动态处理，请将代码移到doPost。
*/
public void init() throws ServletException {
configurableCaptchaService = new ConfigurableCaptchaService();
// 颜色创建工厂
// 单色的
// configurableCaptchaService.setColorFactory(new
// SingleColorFactory(newColor(25, 60, 170)));
// 彩色的
configurableCaptchaService.setColorFactory(new ColorFactory() {
private Random random = new Random();
@Override
public Color getColor(int x) {
int[] c = new int[3];
int i = random.nextInt(c.length);
for (int fi = 0; fi < c.length; fi++) {
if (fi == i) {
c[fi] = random.nextInt(71);
} else {
c[fi] = random.nextInt(256);
}
}
return new Color(c[0], c[1], c[2]);
}
});
// 自定义验证码图片背景
MyCustomBackgroundFactory backgroundFactory = new MyCustomBackgroundFactory();
configurableCaptchaService.setBackgroundFactory(backgroundFactory);
// 图片滤镜设置
ConfigurableFilterFactory filterFactory = new ConfigurableFilterFactory();
List<BufferedImageOp> filters = new ArrayList<BufferedImageOp>();
WobbleImageOp wobbleImageOp = new WobbleImageOp();
wobbleImageOp.setEdgeMode(AbstractImageOp.EDGE_CLAMP);
wobbleImageOp.setxAmplitude(1.0);
wobbleImageOp.setyAmplitude(2.0);
filters.add(wobbleImageOp);
filterFactory.setFilters(filters);
configurableCaptchaService.setFilterFactory(filterFactory);
// 文字渲染器设置
textRenderer = new BestFitTextRenderer();
textRenderer.setBottomMargin(1);
textRenderer.setTopMargin(1);
configurableCaptchaService.setTextRenderer(textRenderer);
}
/**
* Servlet销毁方法,负责销毁所使用资源.
*/
public void destroy() {
wordFactory = null;
fontFactory = null;
textRenderer = null;
configurableCaptchaService = null;
super.destroy();
}
/**
* 内部类 自定义验证码图片背景,主要画一些噪点和干扰线
*/
private class MyCustomBackgroundFactory implements BackgroundFactory {
private Random random = new Random();
public void fillBackground(BufferedImage image) {
Graphics graphics = image.getGraphics();
// 验证码图片的宽高
int imgWidth = image.getWidth();
int imgHeight = image.getHeight();
// 填充为白色背景
graphics.setColor(Color.white);
graphics.fillRect(0, 0, imgWidth, imgHeight);
// 画100个噪点(颜色及位置随机)
for (int i = 0; i < 25; i++) {
// 随机颜色
int rInt = random.nextInt(255);
int gInt = random.nextInt(255);
int bInt = random.nextInt(255);
graphics.setColor(new Color(rInt, gInt, bInt));
// 随机位置
int xInt = random.nextInt(imgWidth - 3);
int yInt = random.nextInt(imgHeight - 2);
// 随机旋转角度
int sAngleInt = random.nextInt(360);
int eAngleInt = random.nextInt(360);
// 随机大小
int wInt = random.nextInt(6);
int hInt = random.nextInt(6);
graphics.fillArc(xInt, yInt, wInt, hInt, sAngleInt, eAngleInt);
// 画干扰线
if (i % 5 == 0) {
int xInt2 = random.nextInt(imgWidth);
int yInt2 = random.nextInt(imgHeight);
graphics.drawLine(xInt, yInt, xInt2, yInt2);
}
}
}
}
}
生成验证码图片，并保存验证码在session中等待校验（以上代码会依赖AOS框架中的类需引入）.
下面是servlet配置
<!-- 验证码Servlet -->
<servlet>
<servlet-name>verCodeServlet</servlet-name>
<servlet-class>com.******.common.VerCodeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>verCodeServlet</servlet-name>
<url-pattern>/verCodeServlet.png</url-pattern>
</servlet-mapping>
下面是JSP代码
<img id="verCode" src="${pageContext.request.contextPath}/verCodeServlet.png"> <a id="kanbuq" href="javascript:void(0);" onclick="changeVer()">看不清，换一张</a> </div>
function changeVer(){
$("#verCode").attr(‘src‘,‘${pageContext.request.contextPath}/verCodeServlet.png‘);
}
验证代码就不上了。
时间： 2024-08-06 21:09:17