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 = 110;// 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 RedisUtil redis;//RedisUtil项目中封装的获取redis的工具类，自己根据实际情况引用
//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
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 Map<String,String> getRandcode(HttpServletRequest request,HttpServletResponse response) {
HashMap<String,String> map = new HashMap<String,String>();
long startime = System.currentTimeMillis();
byte[] bf = null;
ByteArrayOutputStream out = null;
String uuid = UUID.randomUUID().toString();
// 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redis并设置过期时间为3分钟
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 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));
}
//校验
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
