1. Verification code generation class:
import java.util.Random;
import java.awt.image.BufferedImage;
import java.awt.Graphics;
import java.awt.Font;
import java.awt.Color;
/** * Captcha generator class, can generate numbers, uppercase, lowercase letters and a mixture of captcha types. Supports the number of user-defined verification code characters. Support custom captcha image size; You can customize special characters to be excluded. * Support custom number of interference lines; Supports custom verification code colors */
public class ValidateCode {
/** * The verification code type is 0 to 9 */
public static final int TYPE_NUM_ONLY = 0;
/** * The verification code type is a combination of uppercase and lowercase letters */
public static final int TYPE_LETTER_ONLY = 1;
/** * The verification code type is a combination of digits, uppercase letters, and lowercase letters */
public static final int TYPE_ALL_MIXED = 2;
/** * The verification code type is a combination of digits and uppercase letters */
public static final int TYPE_NUM_UPPER = 3;
/** * The verification code type is a mixture of digits and lowercase letters */
public static final int TYPE_NUM_LOWER = 4;
/** * The verification code type is uppercase */
public static final int TYPE_UPPER_ONLY = 5;
/** * The verification code type is only lowercase */
public static final int TYPE_LOWER_ONLY = 6;
private ValidateCode() {}/** * Generates the verification code string ** @paramType * Verification code type, see static attribute * of this class @paramLength * Indicates the length of the verification code. The value is an integer greater than 0 * @paramExChars * Specifies the special characters to be excluded. This parameter is valid only for the alphanumerical and numeric verification codes @returnVerification code The character string is */
public static String generateTextCode(int type, int length, String exChars) {
if (length <= 0)
return "";
StringBuffer code = new StringBuffer();
int i = 0;
Random r = new Random();
switch (type) {
/ / only Numbers
case TYPE_NUM_ONLY:
while (i < length) {
int t = r.nextInt(10);
if (exChars == null || exChars.indexOf(t + "") < 0) {// Exclude special characterscode.append(t); i++; }}break;
// Only letters (uppercase, lowercase)
case TYPE_LETTER_ONLY:
while (i < length) {
int t = r.nextInt(123);
if ((t >= 97 || (t >= 65 && t <= 90)) && (exChars == null || exChars.indexOf((char) t) < 0)) {
code.append((char) t); i++; }}break;
// A combination of digits, uppercase letters, and lowercase letters
case TYPE_ALL_MIXED:
while (i < length) {
int t = r.nextInt(123);
if ((t >= 97 || (t >= 65 && t <= 90) || (t >= 48 && t <= 57))
&& (exChars == null || exChars.indexOf((char) t) < 0)) {
code.append((char) t); i++; }}break;
// Mix numbers and uppercase letters
case TYPE_NUM_UPPER:
while (i < length) {
int t = r.nextInt(91);
if ((t >= 65 || (t >= 48 && t <= 57)) && (exChars == null || exChars.indexOf((char) t) < 0)) {
code.append((char) t); i++; }}break;
// A combination of digits and lowercase letters
case TYPE_NUM_LOWER:
while (i < length) {
int t = r.nextInt(123);
if ((t >= 97 || (t >= 48 && t <= 57)) && (exChars == null || exChars.indexOf((char) t) < 0)) {
code.append((char) t); i++; }}break;
// Uppercase only
case TYPE_UPPER_ONLY:
while (i < length) {
int t = r.nextInt(91);
if ((t >= 65) && (exChars == null || exChars.indexOf((char) t) < 0)) {
code.append((char) t); i++; }}break;
// Only lowercase letters
case TYPE_LOWER_ONLY:
while (i < length) {
int t = r.nextInt(123);
if ((t >= 97) && (exChars == null || exChars.indexOf((char) t) < 0)) {
code.append((char) t); i++; }}break;
}
return code.toString();
}
/** * A captcha is generated ** @paramTextCode * Text verification code * @paramWidth * Image width * @paramHeight * Image height * @paramInterLine * The number of interfering lines in a picture * @paramRandomLocation * Whether the height of each character is random * @paramBackColor * Image color, if null, random color * @paramForeColor * Specifies the font color. If the value is null, the random color * is used @paramLineColor * interference lineColor, if null, random color * @returnImage cache object */
public static BufferedImage generateImageCode(String textCode, int width, int height, int interLine,
boolean randomLocation, Color backColor, Color foreColor, Color lineColor) {
BufferedImage bim = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = bim.getGraphics();
// Draw the background image
g.setColor(backColor == null ? getRandomColor() : backColor);
g.fillRect(0.0, width, height);
// Draw interference lines
Random r = new Random();
if (interLine > 0) {
int x = 0, y = 0, x1 = width, y1 = 0;
for (int i = 0; i < interLine; i++) {
g.setColor(lineColor == null? getRandomColor() : lineColor); y = r.nextInt(height); y1 = r.nextInt(height); g.drawLine(x, y, x1, y1); }}// Write the captcha
// g.setColor(getRandomColor());
// g.setColor(isSimpleColor? Color.BLACK:Color.WHITE);
// The font size is 80% of the height of the image
int fsize = (int) (height * 0.8);
int fx = height - fsize;
int fy = fsize;
g.setFont(new Font("Default", Font.PLAIN, fsize));
// Write the captcha character
for (int i = 0; i < textCode.length(); i++) {
fy = randomLocation ? (int) ((Math.random() * 0.3 + 0.6) * height) : fy;// Whether each character height is random
g.setColor(foreColor == null ? getRandomColor() : foreColor);
g.drawString(textCode.charAt(i) + "", fx, fy);
fx += fsize * 0.9;
}
g.dispose();
return bim;
}
/** * Generate image captcha ** @paramType * Verification code type, see static attribute * of this class @paramLength * Indicates the length of the verification code. The value is an integer greater than 0 * @paramExChars * Special characters to be excluded * @paramWidth * Image width * @paramHeight * Image height * @paramInterLine * The number of interfering lines in a picture * @paramRandomLocation * Whether the height of each character is random * @paramBackColor * Image color, if null, random color * @paramForeColor * Specifies the font color. If the value is null, the random color * is used @paramLineColor * interference lineColor, if null, random color * @returnImage cache object */
public static BufferedImage generateImageCode(int type, int length, String exChars, int width, int height,
int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor) {
String textCode = generateTextCode(type, length, exChars);
BufferedImage bim = generateImageCode(textCode, width, height, interLine, randomLocation, backColor, foreColor,
lineColor);
return bim;
}
/** * produces a random color ** @return* /
private static Color getRandomColor() {
Random r = new Random();
Color c = new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255));
returnc; }}Copy the code2, the Controller
/** * Generates a verification code * @param request
* @param response
* @throws IOException
* @ValidateCodeGenerateTextCode (Verification code character type, verification code length, special characters to be excluded) * @ValidateCodeGenerateImageCode (text verification code, image width, image height, number of interference lines, random character height, image color, font color, interference line color) */
@RequestMapping(value = "validateCode")
public void validateCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
response.setHeader("Cache-Control"."no-cache");
String verifyCode = ValidateCode.generateTextCode(ValidateCode.TYPE_NUM_LOWER, 4.null);
request.getSession().setAttribute("validateCode", verifyCode);
response.setContentType("image/jpeg");
BufferedImage bim = ValidateCode.generateImageCode(verifyCode, 90.30.5.true, Color.WHITE, Color.BLUE, null);
ImageIO.write(bim, "JPEG", response.getOutputStream());
}
/** * Login request * @param* /
@RequestMapping(value = "login", method = RequestMethod.POST, produces = "text/html; charset=utf-8")
public String login(HttpServletRequest request, HttpServletResponse response, UserEntity user) {
// Verify the verification code first
Session session = SecurityUtils.getSubject().getSession();
String code = (String) session.getAttribute("validateCode");
String submitCode = WebUtils.getCleanParam(request, "validateCode");
if(StringUtils.isEmpty(submitCode) || ! StringUtils.equals(code,submitCode.toLowerCase())) { request.setAttribute("LOGIN_ERROR_CODE", LoginConstant.LOGIN_ERROR_CODE_100000);
request.setAttribute("LOGIN_ERROR_MESSAGE", LoginConstant.LOGIN_ERROR_MESSAGE_VALIDATECODE);
return "login";
}
// Want to get the securityutils.getSubject () object.. The access address must be within Shiro's blocking address. No and then a null pointer is reported
Subject sub = SecurityUtils.getSubject();
// The username and password entered by the user are stored in the UsernamePasswordToken object.. And then compared by Shiro's internal certification,
// The authentication executor is sent to doGetAuthenticationInfo in ShiroDbRealm
If the preceding authentication succeeds, the system moves forward. If the authentication fails, an exception is thrown
UsernamePasswordToken token = new UsernamePasswordToken(user.getAccountName(), user.getPassWord());
try {
sub.login(token);
} catch (LockedAccountException lae) {
token.clear();
request.setAttribute("LOGIN_ERROR_CODE", LoginConstant.LOGIN_ERROR_CODE_100002);
request.setAttribute("LOGIN_ERROR_MESSAGE", LoginConstant.LOGIN_ERROR_MESSAGE_SYSTEMERROR);
return "login";
} catch (ExcessiveAttemptsException e) {
token.clear();
request.setAttribute("LOGIN_ERROR_CODE", LoginConstant.LOGIN_ERROR_CODE_100003);
request.setAttribute("LOGIN_ERROR_MESSAGE"."Account number:" + user.getUserName() + LoginConstant.LOGIN_ERROR_MESSAGE_MAXERROR);
return "login";
} catch (AuthenticationException e) {
token.clear();
request.setAttribute("LOGIN_ERROR_CODE", LoginConstant.LOGIN_ERROR_CODE_100001);
request.setAttribute("LOGIN_ERROR_MESSAGE", LoginConstant.LOGIN_ERROR_MESSAGE_USERERROR);
return "login";
}
return "redirect:/index.shtml";
}Copy the codeNote: Some parameters in the login method are defined:
public interface LoginConstant
{
String LOGIN_ERROR_CODE_100000 = "100000";
String LOGIN_ERROR_MESSAGE_VALIDATECODE = "Verification code input error, please re-enter!";
String LOGIN_ERROR_CODE_100001 = "100001";
String LOGIN_ERROR_MESSAGE_USERERROR = "Wrong account or password, please re-enter!";
String LOGIN_ERROR_CODE_100002 = "100002";
String LOGIN_ERROR_MESSAGE_SYSTEMERROR = "User has been locked and cannot log in, please contact the administrator!";
String LOGIN_ERROR_CODE_100003 = "100003";
String LOGIN_ERROR_MESSAGE_MAXERROR = "Too many login failures, locked for 10 minutes!";
String LOGIN_ERROR_CODE_100004 = "100004";
String LOGIN_ERROR_MESSAGE_FORCELOGOUT = "You have been forcibly logged out by your administrator. Please log in again.";
}Copy the code3, login JSP (important code) path information:
The < %String path = request.getContextPath();
String basePath = request.getScheme()+": / /"+request.getServerName()+":"+request.getServerPort()+path; % >Copy the codeJs: Used to replace the verification code image
<script>
function reloadValidateCode(a){
$("#validateCodeImg").attr("src"."<%=basePath%>/validateCode.shtml? data=" + new Date() + Math.floor(Math.random()*24));
}
</script>Copy the codeTags in the login form:
<img id="validateCodeImg" src="<%=basePath%>/validateCode.shtml" /> <a href="#" onclick="javascript:reloadValidateCode();">Can't see?</a>Copy the code4. Shiro anonymous access configuration (no captcha image generation without this configuration)
<! -- Custom filterChainDefinitionMap -->
<bean id="chainDefinitionSectionMetaSource" class="com.collection.shiro.ChainDefinitionSectionMetaSource">
<property name="filterChainDefinitions">
<value>// add this line</value>
</property>
</bean>Copy the codeEffect:
