圖檔驗證碼的方法

1.生成驗證碼的工具類

1. package com.quanran.common.util;

2. import java.awt.BasicStroke;

3. import java.awt.Color;

4. import java.awt.Font;

5. import java.awt.Graphics2D;

6. import java.awt.image.BufferedImage;

7. import java.util.Random;

9. public class VerifyCodeUtils {

11. private int w = 70;

13. private int h = 35;

15. private String[] fontNames = { "宋體", "華文楷體", "黑體", "微軟雅黑", "楷體_GB2312" };

17. private String codes = "23456789abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";

19. private String text;

21. private Random r = new Random();

23. private Color randomColor() {

24. int red = r.nextInt(150);

25. int green = r.nextInt(150);

26. int blue = r.nextInt(150);

27. return new Color(red, green, blue);

28. }

30. private Font randomFont() {

31. int index = r.nextInt(fontNames.length);

32. String fontName = fontNames[index];

33. int style = r.nextInt(4);

34. int size = r.nextInt(5) + 24;

35. return new Font(fontName, style, size);

36. }

38. private void drawLine(BufferedImage image) {

39. // 幹擾線的個數

40. int num = 3;

41. Graphics2D g2 = (Graphics2D) image.getGraphics();

42. for (int i = 0; i < num; i++) {

43. // (x1,y1)為幹擾線的起始點

44. int x1 = r.nextInt(w);

45. int y1 = r.nextInt(h);

46. // (x2,y2)為幹擾線的結束點

47. int x2 = r.nextInt(w);

48. int y2 = r.nextInt(h);

49. // 設定幹擾線的寬度

50. g2.setStroke(new BasicStroke(1.5F));

51. // 幹擾線的顔色

52. g2.setColor(Color.blue);

53. // 将目前這條幹擾線畫出來

54. g2.drawLine(x1, y1, x2, y2);

55. }

56. }

58. private char randomChar() {

59. int index = r.nextInt(codes.length());

60. return codes.charAt(index);

61. }

63. public BufferedImage createImage() {

64. // BufferedImage的構造(寬度，高度和圖檔類型)

65. BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

66. Graphics2D g2 = (Graphics2D) image.getGraphics();

67. // 下面兩行代碼是為了解決圖檔背景色為黑色的問題，我設定成了白色

68. g2.setColor(Color.white);

69. g2.fillRect(0, 0, w, h);

70. // 可變字元串存儲圖檔裡的文本

71. StringBuilder sb = new StringBuilder();

72. // 向圖中畫四個字元

73. for (int i = 0; i < 4; i++) {

74. String s = randomChar() + "";

75. sb.append(s);

76. float x = i * 1.0F * w / 4;

77. g2.setFont(randomFont());

78. g2.setColor(randomColor());

79. g2.drawString(s, x, h - 5);

80. }

81. this.text = sb.toString();

82. drawLine(image);

83. // 傳回圖檔

84. return image;

85. }

87. public String getText() {

88. return text;

89. }

90. }

2.調用工具類

1. package com.quanran.invite.controller;

2. import io.swagger.annotations.Api;

3. import io.swagger.annotations.ApiImplicitParam;

4. import io.swagger.annotations.ApiImplicitParams;

5. import io.swagger.annotations.ApiOperation;

6. import io.swagger.annotations.ApiParam;

7. import java.awt.image.BufferedImage;

8. import java.io.OutputStream;

9. import javax.imageio.ImageIO;

10. import javax.servlet.http.HttpServletRequest;

11. import javax.servlet.http.HttpServletResponse;

12. import org.springframework.web.bind.annotation.GetMapping;

13. import org.springframework.web.bind.annotation.RequestMapping;

14. import org.springframework.web.bind.annotation.RequestParam;

15. import org.springframework.web.bind.annotation.RestController;

16. import com.quanran.visitor.common.util.VerifyCodeUtils;

18. @Api(value="invite系統裡的邀請碼重新發送接口", description="invite系統裡的邀請碼重新發送接口")

19. @RestController

20. @RequestMapping("/invitationCode")

21. public class InvitationCodeController {

22. @ApiOperation("短信重發的驗證碼接口")

23. @GetMapping("getVerifyCode")

24. @ApiImplicitParams({

25. @ApiImplicitParam(name = "verifyCodeKey", value = "驗證碼的key", required = true, paramType = "query")

26. })

27. public void getVerifyCode(HttpServletRequest request, HttpServletResponse response,

28. @ApiParam(value="驗證碼的key", required = true) @RequestParam String verifyCodeKey) {

29. // 生成驗證碼的圖檔

30. VerifyCodeUtils code = new VerifyCodeUtils();

31. BufferedImage image = code.createImage();

32. // 設定響應頭通知浏覽器以圖檔的形式打開

33. response.setContentType("image/jpeg");

34. // 設定響應頭控制浏覽器不要緩存

35. response.setHeader("Pragma","no-cache");

36. response.setHeader("Cache-Control","no-cache");

37. response.setIntHeader("Expires",-1);

38. // 将圖檔變成流寫給浏覽器

39. OutputStream os=response.getOutputStream();

40. ImageIO.write(image, "jpg", os);

41. // 清空關閉流

42. os.flush();

43. os.close();

44. os=null;

45. response.flushBuffer();

46. }

47. }

備注：verifyCodeKey參數是前台傳過來的時間戳，開發中，我們會将此時間戳當做key，生成的驗證碼内容當做value，存到redis中