servlet应用

编写一个servlet，当用户访问你的servlet的时候，就返回一个验证码。
jsp代码
<%@ page language=“java” contentType=“text/html; charset=UTF-8”
pageEncoding=“UTF-8”%>

验证码：${ran}

JavaWeb代码
@WebServlet("/yanzheng")
public class YanZheng extends HttpServlet{
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType(“text/html;charset=utf-8”);
Random random = new Random();
int ran = 100000+random.nextInt(899999);
req.setAttribute(“ran”, ran);
PrintWriter out = resp.getWriter();
out.print(“ran”);
req.getRequestDispatcher(“index.jsp”).forward(req, resp);
System.out.println(ran);
}
}