生成base64图片流验证码，并存入redis进行登录认证

1.controller中认证写法

2.工具类写法
/**

ValidateCodeGen
功能:图片验证码工具类
*/
@Component
public class ValidateCodeGen {

private String randString = “23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghjkmnpqrstuvwxyz”;//随机产生数字与字母组合的字符串
private int width = 100;// 图片宽
private int height = 45;// 图片高
private int lineSize = 30;// 干扰线数量
private int stringNum = 4;// 随机产生字符数量

private Random random = new Random();

@Autowired
private RedisDriver redis;

/*
- 获得字体
  */
  private Font getFont() {
  return new Font(“Fixedsys”, Font.CENTER_BASELINE, 35);
  }
/*
- 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
- @return
  */
  public String getRandcode(String str) {
  // 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);
  g.setFont(new Font(“Times New Roman”, Font.ROMAN_BASELINE, 18));
  g.setColor(getRandColor(110, 133));
  // 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);
  }
  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();
  }
  return randomString;
}

//public String getRandcode() {
public Map<String,String> getRandcode(HttpServletRequest request,HttpServletResponse response) {
//String VALIDATE_CODE_KEY = String.valueOf(IdWorker.getInstance().nextId());//生成验证码的key
HashMap<String,String> map = new HashMap<String,String>();
long startime = System.currentTimeMillis();
byte[] bf = null;
ByteArrayOutputStream out = null;
String uuid = UUID.randomUUID().toString();
//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);
g.setFont(new Font(“Times New Roman”, Font.ROMAN_BASELINE, 18));
g.setColor(getRandColor(110, 133));
// 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);
}
//将验证码对应的key放入session并设置过期时间为3分钟
//SecurityUtils.getSubject().getSession().setAttribute(uuid,randomString);
//SecurityUtils.getSubject().getSession().setTimeout(3 * 60 * 1000);
redis.setStringEx(uuid, 180, randomString);
g.dispose();
```
 try {
     // 将内存中的图片通过流动形式输出到客户端
     out = new ByteArrayOutputStream();
     ImageIO.write(image, "JPEG", out);
     bf = out.toByteArray();
 } catch (Exception e) {
     e.printStackTrace();
 }finally {
     if(out != null){
         try {
             out.close();
         } catch (IOException e) {
         }
     }
 }
 long end = System.currentTimeMillis();
 System.err.println((end - startime)/1000);
 map.put("validateCodeKey", uuid);
 map.put("validateCodeBase64", Base64Utils.encodeToString(bf));
 //return Base64Utils.encodeToString(bf);
 return map;
```
}
/*
- 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, 18 * i – 3, 32);
  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));
  }
public boolean check(String uuid, String code) {
String oldCode = redis.getString(uuid);//(String)SecurityUtils.getSubject().getSession().getAttribute(uuid);//获取Redis中的验证码
//不管校验成功失败，都清空验证码值
redis.delKey(uuid);
//validateCodeKey失效或者跟输入的不匹配，返回提示信息
if(null == oldCode || StringUtils.isEmpty(oldCode) || !code.equalsIgnoreCase(oldCode)){
return false;
}
```
 return true;
```
}

}

3.使用img标签和生成的base64流访问

4.Java后台服务自测：启用服务，调用生成验证码接口，然后网页页面输入data:image/gif;base64,（此处填图片转成base64编码后的编码）网页中直接打开即可

本文地址：https://blog.csdn.net/qq_34279303/article/details/114271768

生成base64图片流验证码，并存入redis进行登录认证

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