10、使用第三方验证码小框架

 

package com.ivan.web;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.dsna.util.images.ValidateCode;


/**
 * 验证码Servlet
 * @author gyf
 *
 */
@WebServlet("/VerificationCode2")
public class VerificationCode2 extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //使用工具开生成验证码,一个jar包ValidateCode.jar
        /**
         * 掌握：java web中，要导入第三个包，跟以前有点不一样
         * 导包都 是放在WEB-INF/lib
         * 
         * 网络上有很多验证码小框架
         */
        
        //1.创建验证码对象
        ValidateCode vc = new ValidateCode(100, 30, 4, 6);
        System.out.println("vc->"+vc);
        
        //2.把验证码返回给客户端
        vc.write(response.getOutputStream());
        
    }

}

 

===========>效果：