XX需求分析系统每日进度（一）
添加验证码的更新和验证功能
思路：后台随机生成四位数字或字母组合的字符串，并保存在Session域中，为保证安全以图片的形式返回给前台，通过比对前台传递的验证码内容和Session域是否一致进行校验
- 主要代码如下
- 生成验证码工具类
public class RandomValidateCodeUtil {
public static final String RANDOMCODEKEY= "RANDOMVALIDATECODEKEY";//放到session中的key
// private String randString = "0123456789";//随机产生只有数字的字符串 private String
//private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生只有字母的字符串
private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串
private int width = 95;// 图片宽
private int height = 25;// 图片高
private int lineSize = 40;// 干扰线数量
private int stringNum = 4;// 随机产生字符数量
private static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class);
private Random random = new Random();
/**
* 获得字体
*/
private Font getFont() {
return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
}
/**
* 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 void getRandcode(HttpServletRequest request, HttpServletResponse response) {
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);//图片大小
g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//字体大小
g.setColor(getRandColor(110, 133));//字体颜色
// 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);
}
logger.info(randomString);
//将生成的随机字符串保存到session中
session.removeAttribute(RANDOMCODEKEY);
session.setAttribute(RANDOMCODEKEY, randomString);
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) {
logger.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e);
}
}
/**
* 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, 13 * i, 16);
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));
}
}
- 后台返回验证码给前台
/**
* 生成验证码
*/
@RequestMapping(value = "/getVerify")
public void getVerify(HttpServletRequest request, HttpServletResponse response) {
try {
response.setContentType("image/jpeg");//设置相应类型,告诉浏览器输出的内容为图片
response.setHeader("Pragma", "No-cache");//设置响应头信息，告诉浏览器不要缓存此内容
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expire", 0);
RandomValidateCodeUtil randomValidateCode = new RandomValidateCodeUtil();
randomValidateCode.getRandcode(request, response);//输出验证码图片方法
} catch (Exception e) {
e.printStackTrace();
}
}
- 后台校验验证码
/**
* 校验验证码
*/
@RequestMapping("/checkVerify")
@ResponseBody
public boolean checkVerify(@RequestBody Map<String, Object> requestMap, HttpServletRequest request) {
try{
HttpSession session = request.getSession();
//从session中获取随机数
System.out.println("requestMap = " + requestMap.toString());
String inputStr = requestMap.get("inputStr").toString();
System.out.println(inputStr);
String random = (String) session.getAttribute("RANDOMVALIDATECODEKEY");
if (random == null) {
return false;
}
if (random.equals(inputStr)) {
return true;
} else {
return false;
}
}catch (Exception e){
e.printStackTrace();
return false;
}
}
明天任务：学习树形结构，并尝试将学科分类替换为树形结构
