hutool工具之验证码登录

package com.baizhi.action;

import java.io.ByteArrayInputStream;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import cn.hutool.captcha.CaptchaUtil;
import cn.hutool.captcha.LineCaptcha;

public class CodeAction {
    private ByteArrayInputStream imageStream;
    //画验证码,并通过流返回到调用位置,将验证码对象放入session中
    public String code() {
        LineCaptcha captcha = CaptchaUtil.createLineCaptcha(150, 50, 4, 6);
        imageStream = new ByteArrayInputStream(captcha.getImageBytes());
        HttpSession session = ServletActionContext.getRequest().getSession();
        session.setAttribute("cap", captcha);
//将验证码写进浏览器
　　　　Response response = ServletActionContext.getResponse();
　　　　ServletOutputStream outputStream = response.getOutputStream();
　　　　captcha.write(outputStream);
　　　 //return "ok";
　　　　return null;
    }
    public ByteArrayInputStream getImageStream() {
        return imageStream;
    }
    public void setImageStream(ByteArrayInputStream imageStream) {
        this.imageStream = imageStream;
    }
    
}

package com.baizhi.action;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import cn.hutool.captcha.LineCaptcha;

public class UserAction {
    private String code;
    public String login() {
        
        //判断账号和密码
        
        //从session中获取验证码对象
        HttpSession session = ServletActionContext.getRequest().getSession();
        LineCaptcha captcha = (LineCaptcha)session.getAttribute("cap");
        //判断验证码是否输入正确
        boolean verify = captcha.verify(code);
        System.out.println("用户输入的验证码为:"+verify);
        
        return "loginOk";
        
    }
    
    
    public String getCode() {
        return code;
    }
    public void setCode(String code) {
        this.code = code;
    }    
    
}

package com.baizhi.test;

import java.util.Scanner;

import cn.hutool.captcha.CaptchaUtil;
import cn.hutool.captcha.CircleCaptcha;
import cn.hutool.captcha.LineCaptcha;
import cn.hutool.captcha.ShearCaptcha;

public class CodeTest {
    public static void main(String[] args) {
        //使用糊涂工具包画验证码
        //CircleCaptcha captcha = CaptchaUtil.createCircleCaptcha(200, 80, 4, 100);
        LineCaptcha captcha = CaptchaUtil.createLineCaptcha(200, 80, 6, 6);
        //ShearCaptcha captcha = CaptchaUtil.createShearCaptcha(200, 80, 4, 1);
        //将验证码保存到d://a.jpg
        captcha.write("D://a.jpg");
        
        Scanner sc = new Scanner(System.in);
        String next = sc.next();
        //判断用户输入是否正确
        boolean verify = captcha.verify(next);
        System.out.println(verify);
    }
}

jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form action="${pageContext.request.contextPath }/user/login">
        账户:<input type="text"   /><br/>
        密码:<input type="text"   /><br/>
         <img src='${pageContext.request.contextPath}/vericode/Code_showCode' alt="" id="sr" onclick='chance()' height='50px' >
        <input  type="submit" />
    </form>
    
</body>
</html>

mapper.xml

<package name="code" extends="struts-default">
        <action name="code" class="com.baizhi.action.CodeAction" method="code">
           <!-- <result name="ok" type="stream">
                <param name="contentType">image/jpeg</param>
                <param name="inputName">imageStream</param>
                <param name="bufferSize">2048</param>
            </result> -->
        </action>
    </package>

其实利用的是src可以的路径可以请求action

利用jQuery绑定点击事件可以实现点击更换验证码

<script type="text/javascript">
        function chance() {
            var img=document.getElementById("sr");
            img.src="${pageContext.request.contextPath }/validateCode?a="+ Math.random();
        }
</script>

以粮为纲全面发展