springboot+vue实现验证码功能

package com.example.demo.Util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
//import java.util.logging.Logger;


public class CodeUtil {

public static final String RANDOMCODEKEY= "RANDOMVALIDATECODEKEY";//放到session中的key
    private String randString = "0123456789";//随机产生只有数字的字符串 private String
    //private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生只有字母的字符串
    //private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串
    private int width = 95;// 图片宽
    private int height = 25;// 图片高
    private int lineSize = 40;// 干扰线数量
    private int stringNum = 4;// 随机产生字符数量

    private static final Logger logger =  LoggerFactory.getLogger(CodeUtil.class);

    private Random random = new Random();

    /**
     * 获得字体
     */
    private Font getFont() {
        return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
    }

    /**
     * 获得颜色
     */
    private Color getRandColor(int fc, int bc) {
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc - 16);
        int g = fc + random.nextInt(bc - fc - 14);
        int b = fc + random.nextInt(bc - fc - 18);
        return new Color(r, g, b);
    }

    /**
     * 生成随机图片
     */
    public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
        HttpSession session = request.getSession();
        // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
        Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
        g.fillRect(0, 0, width, height);//图片大小
        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//字体大小
        g.setColor(getRandColor(110, 133));//字体颜色
        // 绘制干扰线
        for (int i = 0; i <= lineSize; i++) {
            drowLine(g);
        }
        // 绘制随机字符
        String randomString = "";
        for (int i = 1; i <= stringNum; i++) {
            randomString = drowString(g, randomString, i);
        }
        logger.info(randomString);
        //将生成的随机字符串保存到session中
        session.removeAttribute(RANDOMCODEKEY);
        session.setAttribute(RANDOMCODEKEY, randomString);
        g.dispose();
        try {
            // 将内存中的图片通过流动形式输出到客户端
            ImageIO.write(image, "JPEG", response.getOutputStream());
        } catch (Exception e) {
            e.printStackTrace();

//            logger.error("将内存中的图片通过流动形式输出到客户端失败>>>>   ", e);
        }

    }

    /**
     * 绘制字符串
     */
    private String drowString(Graphics g, String randomString, int i) {
        g.setFont(getFont());
        g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
                .nextInt(121)));
        String rand = String.valueOf(getRandomString(random.nextInt(randString
                .length())));
        randomString += rand;
        g.translate(random.nextInt(3), random.nextInt(3));
        g.drawString(rand, 13 * i, 16);
        return randomString;
    }

    /**
     * 绘制干扰线
     */
    private void drowLine(Graphics g) {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(13);
        int yl = random.nextInt(15);
        g.drawLine(x, y, x + xl, y + yl);
    }

    /**
     * 获取随机的字符
     */
    public String getRandomString(int num) {
        return String.valueOf(randString.charAt(num));
    }
}

@RestController
@RequestMapping("/Code")
public class CodeController {

    private final static Logger logger =  LoggerFactory.getLogger(CodeController.class);

    /**
     * 生成验证码
     */
    @GetMapping("getVerify")
    @CrossOrigin(origins = "*")
//    @RequestMapping(value = "/getVerify")
    public void getVerify(HttpServletRequest request, HttpServletResponse response) {
        try {
            response.setContentType("image/jpeg");//设置相应类型,告诉浏览器输出的内容为图片
            response.setHeader("Pragma", "No-cache");//设置响应头信息，告诉浏览器不要缓存此内容
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Expire", 0);
            CodeUtil randomValidateCode = new CodeUtil();
            randomValidateCode.getRandcode(request, response);//输出验证码图片方法
        } catch (Exception e) {
            e.printStackTrace();
//            logger.error("获取验证码失败>>>>   ", e);
        }
    }

    /**
     * 校验验证码
     */
    @RequestMapping(value = "/checkVerify",headers = "Accept=application/json")
    @CrossOrigin(origins = "*",allowCredentials="true")
    public boolean checkVerify(@RequestParam String verifyInput, HttpSession session) {
        try{
            //从session中获取随机数
            String inputStr = verifyInput;
            String random = (String) session.getAttribute("RANDOMVALIDATECODEKEY");
            if (random == null) {
                return false;
            }
            if (random.equals(inputStr)) {
                return true;
            } else {
                return false;
            }
        }catch (Exception e){
            e.printStackTrace();
//            logger.error("验证码校验失败", e);
            return false;
        }
    }
}

<template>
  <div>
    <el-row :gutter="0">
      <el-form
        ref="elForm"
        :model="formData"
        :rules="rules"
        size="medium"
        label-width="83px"
        label-position="left"
      >
        <img :src="imgUrl" alt="更换验证码" @click="getVerify(this)" />
        <el-col :span="6">
          <el-form-item label="验证码" prop="code">
            <el-input
              v-model="formData.code"
              placeholder="请输入验证码"
              clearable
              :style="{ width: '100%' }"
            >
            </el-input>
          </el-form-item>
        </el-col>
        <el-col :span="24">
          <el-form-item size="large">
            <el-button type="primary" @click="aVerify()">提交</el-button>
            <el-button @click="resetForm">重置</el-button>
          </el-form-item>
        </el-col>
      </el-form>
    </el-row>
  </div>
</template>

data() {
    return {
      imgUrl: "/api/Code/getVerify",
     
      formData: {
        code: undefined,
      },
      rules: {
        code: [
          {
            required: true,
            message: "请输入验证码",
            trigger: "blur",
          },
        ],
      },
    };
  },

methods: {
    aVerify() {
      var that = this;
      var data = Qs.stringify({
        verifyInput: this.formData.code,
      });
      that
        .axios({
          method: "post",
          url: "/api/Code/checkVerify",
          data: data,
        })
        .then((response) => {
          console.log(response);
        
            if ( response.data) {
             alert("success!");
           } else {
             alert("failed!");
           }
            getVerify();
        });
    },
    getVerify(obj) {
      console.log(obj);
      // obj.src = "/api/Code/getVerify?" + Math.random();
      this.imgUrl = "/api/Code/getVerify?" + Math.random();
    },
    resetForm() {
      this.$refs["elForm"].resetFields();
    },
},

function getVerify(obj) {
  // obj.src =  "/api/Code/getVerify"
  obj.src = "/api/Code/getVerify?" + Math.random(); //原生js方式
  console.log(obj.src);
  //  this.imgCode= "/api/Code/getVerify?"+Math.random();
}
//   function getVerify() {
//     // $("#imgCode").on("click", function() {
//     $("#imgVerify").attr("src", 'Code/getVerify?' + Math.random());//jquery方式
//     // });
// }
function aVerify() {
  var value = $("#verify_input").val();
  // alert(value);
  $.ajax({
    async: false,
    type: "post",
    url: "/api/Code/checkVerify",
    dataType: "json",
    data: {
      verifyInput: value,
    },

    success: function (result) {
      if (result) {
        alert("success!");
      } else {
        alert("failed!");
      }
      // window.location.reload();
      getVerify();
    },
  });
}

imgUrl:  "/api/Code/getVerify?" + Math.random(), 

aVerify() {
      var that = this;
      var data = Qs.stringify({
        verifyInput: this.formData.code,
      });
      that
        .axios({
          method: "post",
          url: "/api/Code/checkVerify",
          data: data,
        })
        .then((response) => {
          console.log(response);
        this.result=response.data;
        console.log(this.result);
            if ( response.data) {
              
              this.submitForm();
            //  alert("success!");
           } else {
             this.$message({
          type: "warning",
          message: "验证码错误",
        }); 
        this.getVerify();
           }
          
        //  this.reload();
        });  
    },
    getVerify() {
      console.log("hhhhh");
       // var timestmp = (new Date()).valueOf();
      // obj.src = "/api/Code/getVerify?" + Math.random();
      this.imgUrl = "/api/Code/getVerify?" + Math.random();
      //  this.imgUrl = "/api/Code/getVerify?" + "&t=" +timestmp;
    },