以下是一个简单的Servet和JSP结合使用来生成验证码的例子:
```java

// 验证码Servet类
public class CaptchaServet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 设置响应内容类型为图片类型
response.setContentType("







