Struts2下验证码的实现

Struts2下验证码的实现/blog/1300116struts2；struts2验证码；java验证码；jsp验证码项目中要用到验证码功能，所以实现后在此记录下来实现代码，以备日后用。

首先是actionUserLoginVerificationCodeActionImpl.javaJava代码1.package action.impl;2.3.import java.io.ByteArrayInputStream;4.import java.io.IOException;5.6.import javax.servlet.http.HttpSession;7.8.import system.SysAction;9.import tool.ImageCode;10.import tool.RandomCodeImage;11.12.public class UserLoginVerificationCodeActionImpl extends SysAction implements13. UserLoginVerificationCodeAction {14.15. private String code;16.17. private ByteArrayInputStream inputStream;18.19. private static final long serialVersionUID = 123456756789765L;20.21. /**22. * @return the code23. */24. public String getCode() {25. return code;26. }28. /**29. * @return the inputStream30. */31. public ByteArrayInputStream getInputStream() {32. return inputStream;33. }34.35. /**36. * @param code37. * the code to set38. */39. public void setCode(String code) {40. this.code = code;41. }42.43. /**44. * @param inputStream45. * the inputStream to set46. */47. public void setInputStream(ByteArrayInputStream inputStream) {48. this.inputStream = inputStream;49. }50.51. /**52. * 生成驗證碼53. */54. public String verificationCode() {55. try {56. ImageCode imageCode = RandomCodeImage.getImage();57. HttpSession session = request.getSession();58. session.setAttribute("userLoginCode",imageCode.getKey());59. inputStream = imageCode.getValue();60. return SUCCESS;61. } catch (IOException e) {62. e.printStackTrace();63. return ERROR;64. }65. }67.}工具类ImageCode.java，主要是实现了接口，用于记录验证码和生成的验证码的字节输入流。

Java代码1.package tool;2.3.import java.io.ByteArrayInputStream;4.import java.util.Map.Entry;5.6.public class ImageCode implements Entry<String, ByteArrayInputStream> {7.private String key;8.private ByteArrayInputStream value;9.10. public ImageCode(String key, ByteArrayInputStream byteArrayInputStream) {11. this.key = key;12. this.value = byteArrayInputStream;13. }14.15. public String getKey() {16. // TODO Auto-generated method stub17. return key;18. }19.20. public ByteArrayInputStream getValue() {21. // TODO Auto-generated method stub22. return value;23. }24.25. public ByteArrayInputStream setValue(ByteArrayInputStream value) {26. this.value = value;27. return value;28. }29.30.}工具类RandomCodeImage.java，主要是生成验证码和验证码输入流。

Java代码1.package tool;2.3.import java.awt.Color;4.import java.awt.Font;5.import java.awt.Graphics;6.import java.awt.image.BufferedImage;7.import java.io.ByteArrayInputStream;8.import java.io.ByteArrayOutputStream;9.import java.io.IOException;10.import java.util.Random;11.12.import javax.imageio.ImageIO;13.import javax.imageio.stream.ImageOutputStream;14.15.public class RandomCodeImage {16.17. public static ImageCode getImage() throws IOException {18.19. Random random = new Random();20.21. int width = 60, height = 20;22.23. BufferedImage image = new BufferedImage(width, height,24. BufferedImage.TYPE_INT_RGB);25.26. // 取得Graphics对象，用来绘制图片27. Graphics g = image.getGraphics();28. // 绘制图片背景和文字,释放Graphics对象所占用的资源。

29. g.setColor(Color.WHITE);30. // 设置内容生成的位置31. g.fillRect(0, 0, width, height);32. // 设置内容的字体和大小33. g.setFont(new Font("Times New Roman", Font.PLAIN, 14));34.35. // 设置内容的颜色：主要为生成图片背景的线条36. g.setColor(Color.WHITE);37.38. // // 图片背景上随机生成155条线条，避免通过图片识别破解验证码39. // for (int i = 0; i < 155; i++) {40. // int x = random.nextInt(width);41. // int y = random.nextInt(height);42. // int xl = random.nextInt(12);43. // int yl = random.nextInt(12);44. // g.drawLine(x, y, x + xl, y + yl);45. // }46.47. // 生成四位的随机数,生成一个数，写一个48. // String[] s = { "A", "B", "C", "D","E", "F", "G", "H", "I", "J", "K",49. // "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W",50. // "X", "Y", "Z" };51. String[] s = { "1", "2", "3", "4", "5","6", "7", "8", "9", "0" };52. String content = "";53. for (int i = 0; i < 4; i++) {54. String rand = "";55. if (random.nextBoolean()) {56. rand = String.valueOf(random.nextInt(10));57. } else {58. int index = random.nextInt(10);59. rand = s[index];60. }61. content += rand;62. g.setColor(Color.RED);63. g.drawString(rand, 13 * i + 6, 16);64. }65.66. // 释放此图形的上下文以及它使用的所有系统资源，类似于关闭流67. g.dispose();68.69. ByteArrayOutputStream output = new ByteArrayOutputStream();70. ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);71.72. ImageIO.write(image, "JPEG", imageOut);73.74. imageOut.close();75. return new ImageCode(content, new ByteArrayInputStream(76. output.toByteArray()));77. }78.79. private static Color getRandColor(int fc, int bc){80. Random random = new Random();81. if (fc > 255)82. fc = 255;83. if (bc > 255)84. bc = 255;85. int r = fc + random.nextInt(bc - fc);86. int g = fc + random.nextInt(bc - fc);87. int b = fc + random.nextInt(bc - fc);88. return new Color(r, g, b);89. }90.91.}这个就是action的配置文件了，供前台页面进行访问。