java實現圖片隨機驗證碼
阿新 • • 發佈：2019-01-10
轉自：https://blog.csdn.net/zhulin40/article/details/51899487
<div class="form-group col-lg-6"> <label for="id" class="col-sm-4 control-label"> 驗證碼: </label> <div class="col-sm-8"> <input type="text" id="code" name="code" class="form-control" style="width:250px;"/> <img id="imgObj" alt="驗證碼" src="/article/validateCode" onclick="changeImg()"/> <a href="#" onclick="changeImg()">換一張</a> </div> </div> <script type="text/javascript"> // 重新整理圖片 function changeImg() { var imgSrc = $("#imgObj"); var src = imgSrc.attr("src"); imgSrc.attr("src", changeUrl(src)); } //為了使每次生成圖片不一致，即不讓瀏覽器讀快取，所以需要加上時間戳 function changeUrl(url) { var timestamp = (new Date()).valueOf(); var index = url.indexOf("?",url); if (index > 0) { url = url.substring(0, url.indexOf(url, "?")); } if ((url.indexOf("&") >= 0)) { url = url + "×tamp=" + timestamp; } else { url = url + "?timestamp=" + timestamp; } return url; } </script>
package cc.zenking.cloud.zksc.sso.util; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Date; import java.util.Random; /** * 驗證碼生成器 * * @author */ public class VerificationCodeImgUtil { // 圖片的寬度。 private int width = 160; // 圖片的高度。 private int height = 40; // 驗證碼字元個數 private int codeCount = 5; // 驗證碼干擾線數 private int lineCount = 150; // 驗證碼 private String code = null; // 驗證碼圖片Buffer private BufferedImage buffImg = null; // 驗證碼範圍,去掉0(數字)和O(拼音)容易混淆的(小寫的1和L也可以去掉,大寫不用了) private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; /** * 預設建構函式,設定預設引數 */ public VerificationCodeImgUtil() { this.createCode(); } /** * @param width * 圖片寬 * @param height * 圖片高 */ public VerificationCodeImgUtil(int width, int height) { this.width = width; this.height = height; this.createCode(); } /** * @param width * 圖片寬 * @param height * 圖片高 * @param codeCount * 字元個數 * @param lineCount * 干擾線條數 */ public VerificationCodeImgUtil(int width, int height, int codeCount, int lineCount) { this.width = width; this.height = height; this.codeCount = codeCount; this.lineCount = lineCount; this.createCode(); } public void createCode() { int x = 0, fontHeight = 0, codeY = 0; int red = 0, green = 0, blue = 0; x = width / (codeCount + 2);// 每個字元的寬度(左右各空出一個字元) fontHeight = height - 2;// 字型的高度 codeY = height - 4; // 影象buffer buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = buffImg.createGraphics(); // 生成隨機數 Random random = new Random(); // 將影象填充為白色 g.setColor(Color.WHITE); g.fillRect(0, 0, width, height); // 建立字型,可以修改為其它的 Font font = new Font("Fixedsys", Font.PLAIN, fontHeight); // Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight); g.setFont(font); for (int i = 0; i < lineCount; i++) { // 設定隨機開始和結束座標 int xs = random.nextInt(width);// x座標開始 int ys = random.nextInt(height);// y座標開始 int xe = xs + random.nextInt(width / 8);// x座標結束 int ye = ys + random.nextInt(height / 8);// y座標結束 // 產生隨機的顏色值，讓輸出的每個干擾線的顏色值都將不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); g.setColor(new Color(red, green, blue)); g.drawLine(xs, ys, xe, ye); } // randomCode記錄隨機產生的驗證碼 StringBuffer randomCode = new StringBuffer(); // 隨機產生codeCount個字元的驗證碼。 for (int i = 0; i < codeCount; i++) { String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]); // 產生隨機的顏色值，讓輸出的每個字元的顏色值都將不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); g.setColor(new Color(red, green, blue)); g.drawString(strRand, (i + 1) * x, codeY); // 將產生的四個隨機數組合在一起。 randomCode.append(strRand); } // 將四位數字的驗證碼儲存到Session中。 code = randomCode.toString(); } public void write(String path) throws IOException { OutputStream sos = new FileOutputStream(path); this.write(sos); } public void write(OutputStream sos) throws IOException { ImageIO.write(buffImg, "png", sos); sos.close(); } public BufferedImage getBuffImg() { return buffImg; } public String getCode() { return code; } /** * 測試函式,預設生成到d盤 * * @param args */ public static void main(String[] args) { VerificationCodeImgUtil vCode = new VerificationCodeImgUtil(160, 40, 5, 150); try { String path = "D:/" + new Date().getTime() + ".png"; System.out.println(vCode.getCode() + " >" + path); vCode.write(path); } catch (IOException e) { e.printStackTrace(); } } }
/** * @Title: validateCode * @Description: (響應驗證碼頁面 ) * @param @param request * @param @param response * @param @return * @param @throws Exception 設定檔案 * @return String 返回型別 * @throws */ @RequestMapping(value="/validateCode") public String validateCode(HttpServletRequest request,HttpServletResponse response) throws Exception{ // 設定響應的型別格式為圖片格式 response.setContentType("image/jpeg"); //禁止影象快取。 response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); HttpSession session = request.getSession(); VerificationCodeImgUtil vCode = new VerificationCodeImgUtil(120,40,5,100); session.setAttribute("code", vCode.getCode()); vCode.write(response.getOutputStream()); return null; }
/**
* 登入
*
* @return
*/
@RequestMapping(value = "/login")
public ResponseEntity<Object> login(HttpServletRequest request,LoginRequest loginRequest) {
String code = request.getParameter("code");
HttpSession session = request.getSession();
String sessionCode = (String) session.getAttribute("code");
if (!StringUtils.equalsIgnoreCase(code, sessionCode)) { //忽略驗證碼大小寫
// throw new RuntimeException("驗證碼對應不上code=" + code + " sessionCode=" + sessionCode);
return JsonResponse.fail(ErrorCode.ERROR_CODE_1017);
}
int n = userService.Login(loginRequest);
if (n > 0) {
return JsonResponse.success(n);
}
return JsonResponse.fail(ErrorCode.ERROR_CODE_1012);
}