标签:ica int 完成 user oca setimage 图形 col nfa
一、生成图片验证码的步骤public class ImageCode {
private BufferedImage image;//展示的图片
private String code;//生成的随机数,Session
private LocalDateTime expireTime;//过期时间
public BufferedImage getImage() {
return image;
}
public void setImage(BufferedImage image) {
this.image = image;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public LocalDateTime getExpireTime() {
return expireTime;
}
public void setExpireTime(LocalDateTime expireTime) {
this.expireTime = expireTime;
}
//是否过期
public boolean isExpried() {
return LocalDateTime.now().isAfter(expireTime);
}
public ImageCode(BufferedImage image, String code, LocalDateTime expireTime) {
this.image = image;
this.code = code;
this.expireTime = expireTime;
}
//多少秒过期(60秒)
public ImageCode(BufferedImage image, String code, int expireIn) {
this.image = image;
this.code = code;
this.expireTime = LocalDateTime.now().plusSeconds(expireIn);
}
}
@RestController
public class ValidateCodeController {
private static final String SESSION_KEY = "SESSION_KEY_IMAGE_CODE";
//操作Session的类
private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();
@GetMapping("/code/image")
public void createCode(HttpServletRequest request,HttpServletResponse response) throws IOException {
//1.根据随机数生成数字
ImageCode imageCode = createImageCode(request);
//2.将随机数存到Session中
//把请求传递进ServletWebRequest,
sessionStrategy.setAttribute(new ServletWebRequest(request), SESSION_KEY, imageCode);
//3.将生成的图片写到接口的响应中
ImageIO.write(imageCode.getImage(), "JPEG", response.getOutputStream());
}
//生成图片
private ImageCode createImageCode(HttpServletRequest request) {
int width = 67;
int height = 23;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics graphics = image.getGraphics();
Random random = new Random();
graphics.setColor(getRandColor(200,250));
graphics.fillRect(0, 0, width, height);
graphics.setFont(new Font("Times New Roman", Font.ITALIC, 20));
graphics.setColor(getRandColor(160,200));
for(int i=0;i<155;i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
graphics.drawLine(x, y, x+xl, y+yl);
}
String sRand = "";
for (int i = 0; i < 4; i++) {
String rand = String.valueOf(random.nextInt(10));
sRand +=rand;
graphics.setColor(new Color(20, random.nextInt(110), 20+random.nextInt(110),20+random.nextInt(110)));
graphics.drawString(rand, 13*i+6, 16);
}
graphics.dispose();
return new ImageCode(image, sRand, 60);
}
//随机生成背景条纹
private Color getRandColor(int fc, int bc) {
Random random = new Random();
if (fc>255) {
fc = 255;
}
if (bc>255) {
bc = 255;
}
int r = fc + random.nextInt(bc-fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
}
前台登录页面增加图形验证码样式
其次,再安全配置类;增加/code/image请求的
.antMatchers("/code/image").permitAll()
二、运行项目
在点击登录按钮之前,需要处理校验码校验的逻辑这一步骤,这个步骤放在UsernamePasswordAuthenticationFilter之前,所以说,在安全配置类里面需求写一个自定义的Filter并且加在Username xx之前
最后启动项目,访问:http://localhost:8080/sign.html
在不输入验证码的时候,点击登录可以看到它把异常栈里面的所有错误信息都打印出来了
这个并不是我们想要的,这个时候需要修改一下失败处理器AuthenticationFailureHandler
把返回所有堆栈信息的方法,改成只返回错误信息。
还有一个问题,就是验证码错误的时候过滤器没有做拦截,而是继续往下走了,这个时候需要更改Filter的方法
启动项目,访问:http://localhost:8080/sign.html
再不输入验证码的时候,点击登录
可以直接看到错误信息
同理,之后继续填写正确的验证码,则可以得到对应的用户信息
输入错误,则有对应错误的消息提示,这个时候 验证码的功能才算是完成了。
标签:ica int 完成 user oca setimage 图形 col nfa
原文地址:http://blog.51cto.com/mazongfei/2339927