Springboot实现验证码登录

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;

/**
 * @author zct
 * @date 2018年2月6日
 * @param
 * @desc 图形验证码生成
 *
 */
public class VerifyUtil {
 // 验证码字符集
 private static final char[] chars = {
  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
  'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
  'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
  'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
 // 字符数量
 private static final int SIZE = 4;
 // 干扰线数量
 private static final int LINES = 5;
 // 宽度
 private static final int WIDTH = 80;
 // 高度
 private static final int HEIGHT = 40;
 // 字体大小
 private static final int FONT_SIZE = 30;

 /**
 * 生成随机验证码及图片
 * Object[0]：验证码字符串；
 * Object[1]：验证码图片。
 */
 public static Object[] createImage() {
 StringBuffer sb = new StringBuffer();
 // 1.创建空白图片
 BufferedImage image = new BufferedImage(
  WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
 // 2.获取图片画笔
 Graphics graphic = image.getGraphics();
 // 3.设置画笔颜色
 graphic.setColor(Color.LIGHT_GRAY);
 // 4.绘制矩形背景
 graphic.fillRect(0, 0, WIDTH, HEIGHT);
 // 5.画随机字符
 Random ran = new Random();
 for (int i = 0; i <SIZE; i++) {
  // 取随机字符索引
  int n = ran.nextInt(chars.length);
  // 设置随机颜色
  graphic.setColor(getRandomColor());
  // 设置字体大小
  graphic.setFont(new Font(
   null, Font.BOLD + Font.ITALIC, FONT_SIZE));
  // 画字符
  graphic.drawString(
   chars[n] + "", i * WIDTH / SIZE, HEIGHT*2/3);
  // 记录字符
  sb.append(chars[n]);
 }
 // 6.画干扰线
 for (int i = 0; i < LINES; i++) {
  // 设置随机颜色
  graphic.setColor(getRandomColor());
  // 随机画线
  graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT),
   ran.nextInt(WIDTH), ran.nextInt(HEIGHT));
 }
 // 7.返回验证码和图片
 return new Object[]{sb.toString(), image};
 }

 /**
 * 随机取色
 */
 public static Color getRandomColor() {
 Random ran = new Random();
 Color color = new Color(ran.nextInt(256),
  ran.nextInt(256), ran.nextInt(256));
 return color;
 }
}

 /**
 * 登录入口
 *
 * @param username 用户名
 * @param password 密码
 * @param code 验证码
 * @param response 回调json数据 成功返回200，失败返回500
 */
 @ApiOperation("登录")
 @PostMapping("/login")
 public void adminLoginByPasswword(@ApiParam("用户名") @RequestParam String username, @ApiParam("密码") @RequestParam String password, @ApiParam("验证码") @RequestParam String code, HttpServletResponse response,HttpServletRequest request) {
 HttpSession session=request.getSession();
 if(session.getAttribute("imageCode")==null){
  renderFail(response, "重新获取验证码");
 }else {
  if(session.getAttribute("imageCode").toString().equalsIgnoreCase(code)){
  Map<String, Object> user = adminService.checkAdminLogin(username, password);
  if (user == null) {
   renderFail(response, "登录失败");
  } else {
   renderSuccess(response, "登录成功");
  }
  }else {
  renderFail(response, "验证码错误");
  }
 }


 }

@ApiOperation("生成验证码")
 @GetMapping("/getcode")
 public void getCode(HttpServletResponse response, HttpServletRequest request) throws Exception{
 HttpSession session=request.getSession();
 //利用图片工具生成图片
 //第一个参数是生成的验证码，第二个参数是生成的图片
 Object[] objs = VerifyUtil.createImage();
 //将验证码存入Session
 session.setAttribute("imageCode",objs[0]);

 //将图片输出给浏览器
 BufferedImage image = (BufferedImage) objs[1];
 response.setContentType("image/png");
 OutputStream os = response.getOutputStream();
 ImageIO.write(image, "png", os);
 }