vue+element实现登录界面（图片验证码、记住密码）

用户名+密码+验证码登录
验证码：前端绑定后端生成得验证码图片，前端提交表单信息到后端进行验证，后端验证码存入session
记住我：将用户名密码存入cookies

1、login.vue代码

2、验证码生成工具

package com.javaclimb.music.utils;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;


public class VerificationCode {
    private int width = 100;// 生成验证码图片的宽度
    private int height = 30;// 生成验证码图片的高度
    private String[] fontNames = { "宋体", "楷体", "隶书", "微软雅黑" };
    private Color bgColor = new Color(255, 255, 255);// 定义验证码图片的背景颜色为白色
    private Random random = new Random();
    private String codes = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    private String text;// 记录随机字符串

    /**
     * 获取一个随意颜色
     *
     * @return
     */
    private Color randomColor() {
        int red = random.nextInt(150);
        int green = random.nextInt(150);
        int blue = random.nextInt(150);
        return new Color(red, green, blue);
    }

    /**
     * 获取一个随机字体
     *
     * @return
     */
    private Font randomFont() {
        String name = fontNames[random.nextInt(fontNames.length)];
        int style = random.nextInt(4);
        int size = random.nextInt(5) + 24;
        return new Font(name, style, size);
    }

    /**
     * 获取一个随机字符
     *
     * @return
     */
    private char randomChar() {
        return codes.charAt(random.nextInt(codes.length()));
    }

    /**
     * 创建一个空白的BufferedImage对象
     *
     * @return
     */
    private BufferedImage createImage() {
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        g2.setColor(bgColor);// 设置验证码图片的背景颜色
        g2.fillRect(0, 0, width, height);
        return image;
    }

    public BufferedImage getImage() {
        BufferedImage image = createImage();
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < 4; i++) {
            String s = randomChar() + "";
            sb.append(s);
            g2.setColor(randomColor());
            g2.setFont(randomFont());
            float x = i * width * 1.0f / 4;
            g2.drawString(s, x, height - 8);
        }
        this.text = sb.toString();
        drawLine(image);
        return image;
    }

    /**
     * 绘制干扰线
     *
     * @param image
     */
    private void drawLine(BufferedImage image) {
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        int num = 5;
        for (int i = 0; i < num; i++) {
            int x1 = random.nextInt(width);
            int y1 = random.nextInt(height);
            int x2 = random.nextInt(width);
            int y2 = random.nextInt(height);
            g2.setColor(randomColor());
            g2.setStroke(new BasicStroke(1.5f));
            g2.drawLine(x1, y1, x2, y2);
        }
    }

    public String getText() {
        return text;
    }

    public static void output(BufferedImage image, OutputStream out) throws IOException {
        ImageIO.write(image, "JPEG", out);
    }

}

3、后端 controller层

package com.javaclimb.music.controller;

import com.alibaba.fastjson.JSONObject;
import com.javaclimb.music.service.AdminService;
import com.javaclimb.music.utils.Consts;
import com.javaclimb.music.utils.VerificationCode;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;

@RestController
public class AdminController {

    @Autowired
    private AdminService adminService;


    //    判断是否登录成功
    @RequestMapping(value = "/admin/login/status", method = RequestMethod.POST)
    public Object loginStatus(HttpServletRequest request, HttpSession session) {
        Object verifyCode = request.getSession().getAttribute("verify_code");//获取session里的验证码
        JSONObject jsonObject = new JSONObject();
        String name = request.getParameter("name");
        String password = request.getParameter("password");
        String code = request.getParameter("code");
        //判断结果
        if (verifyCode.toString().equals(code)) {
            boolean flag = adminService.verifyPassword(name, password);
            if (flag) {
                jsonObject.put(Consts.CODE, 1);
                jsonObject.put(Consts.MSG, "登录成功");
                session.setAttribute(Consts.NAME, name);
                return jsonObject;
            } else {
                jsonObject.put(Consts.CODE, 2);
                jsonObject.put(Consts.MSG, "用户名或密码错误");
                return jsonObject;

            }
        } else {
            jsonObject.put(Consts.CODE, 0);
            jsonObject.put(Consts.MSG, "验证码错误");
            return jsonObject;
        }
    }

    //生成验证码图片返回给前端图片地址
    @GetMapping("/verifyCode")
    public void verifyCode(HttpServletRequest request, HttpServletResponse resp) throws IOException {
        VerificationCode code = new VerificationCode();
        BufferedImage image = code.getImage();
        String text = code.getText();
        HttpSession session = request.getSession(true);
        session.setAttribute("verify_code", text);
        VerificationCode.output(image,resp.getOutputStream());
    }

}