Java工具类-验证码工具
1.工具类，生成随机验证码字符串
import java.util.Arrays; /** * 工具类，生成随机验证码字符串 * * @version 1.0 * @author * */ public class SecurityCode { /** * 验证码难度级别，Simple只包含数字，Medium包含数字和小写英文，Hard包含数字和大小写英文 */ public enum SecurityCodeLevel { Simple, Medium, Hard }; /** * 产生默认验证码，4位中等难度 * * @return String 验证码 */ public static String getSecurityCode() { return getSecurityCode(4, SecurityCodeLevel.Medium, false); } /** * 产生长度和难度任意的验证码 * * @param length * 长度 * @param level * 难度级别 * @param isCanRepeat * 是否能够出现重复的字符，如果为true，则可能出现 5578这样包含两个5,如果为false，则不可能出现这种情况 * @return String 验证码 */ public static String getSecurityCode(int length, SecurityCodeLevel level, boolean isCanRepeat) { // 随机抽取len个字符 int len = length; // 字符集合(除去易混淆的数字0、数字1、字母l、字母o、字母O) char[] codes = { '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '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' }; // 根据不同的难度截取字符数组 if (level == SecurityCodeLevel.Simple) { codes = Arrays.copyOfRange(codes, 0, 9); } else if (level == SecurityCodeLevel.Medium) { codes = Arrays.copyOfRange(codes, 0, 33); } // 字符集合长度 int n = codes.length; // 抛出运行时异常 if (len > n && isCanRepeat == false) { throw new RuntimeException(String.format( "调用SecurityCode.getSecurityCode(%1$s,%2$s,%3$s)出现异常，" + "当isCanRepeat为%3$s时，传入参数%1$s不能大于%4$s", len, level, isCanRepeat, n)); } // 存放抽取出来的字符 char[] result = new char[len]; // 判断能否出现重复的字符 if (isCanRepeat) { for (int i = 0; i < result.length; i++) { // 索引 0 and n-1 int r = (int) (Math.random() * n); // 将result中的第i个元素设置为codes[r]存放的数值 result[i] = codes[r]; } } else { for (int i = 0; i < result.length; i++) { // 索引 0 and n-1 int r = (int) (Math.random() * n); // 将result中的第i个元素设置为codes[r]存放的数值 result[i] = codes[r]; // 必须确保不会再次抽取到那个字符，因为所有抽取的字符必须不相同。 // 因此，这里用数组中的最后一个字符改写codes[r]，并将n减1 codes[r] = codes[n - 1]; n--; } } return String.valueOf(result); } public static void main(String[] args) { SecurityCode code = new SecurityCode(); System.out.println(getSecurityCode(6,SecurityCodeLevel.Hard,false)); } }
2.
package code; import com.opensymphony.xwork2.ActionSupport; import java.io.ByteArrayInputStream; import java.util.Map; import org.apache.struts2.interceptor.SessionAware; /** * 提供图片验证码 * @version 1.0 2012/08/22 * @author dongliyang */ @SuppressWarnings("serial") public class SecurityCodeImageAction extends ActionSupport implements SessionAware{ //Struts2中Map类型的session private Map<String, Object> session; //图片流 private ByteArrayInputStream imageStream; public ByteArrayInputStream getImageStream() { return imageStream; } public void setImageStream(ByteArrayInputStream imageStream) { this.imageStream = imageStream; } public String execute() throws Exception { //如果开启Hard模式，可以不区分大小写 // String securityCode = SecurityCode.getSecurityCode(4,SecurityCodeLevel.Hard, false).toLowerCase(); //获取默认难度和长度的验证码 String securityCode = SecurityCode.getSecurityCode(); imageStream = SecurityImage.getImageAsInputStream(securityCode); //放入session中 session.put("SESSION_SECURITY_CODE", securityCode); return SUCCESS; } public void setSession(Map<String, Object> session) { this.session = session; } }
3.
package code; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.util.Random; import com.sun.image.codec.jpeg.ImageFormatException; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; /** * 工具类，生成验证码图片 * @version 1.0 2012/08/21 * @author dongliyang * */ public class SecurityImage { /** * 生成验证码图片 * @param securityCode 验证码字符 * @return BufferedImage 图片 */ public static BufferedImage createImage(String securityCode){ //验证码长度 int codeLength=securityCode.length(); //字体大小 int fSize = 15; int fWidth = fSize + 1; //图片宽度 int width = codeLength * fWidth + 6 ; //图片高度 int height = fSize * 2 + 1; //图片 BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g=image.createGraphics(); //设置背景色 g.setColor(Color.WHITE); //填充背景 g.fillRect(0, 0, width, height); //设置边框颜色 g.setColor(Color.LIGHT_GRAY); //边框字体样式 g.setFont(new Font("Arial", Font.BOLD, height - 2)); //绘制边框 g.drawRect(0, 0, width - 1, height -1); //绘制噪点 Random rand = new Random(); //设置噪点颜色 g.setColor(Color.LIGHT_GRAY); for(int i = 0;i < codeLength * 6;i++){ int x = rand.nextInt(width); int y = rand.nextInt(height); //绘制1*1大小的矩形 g.drawRect(x, y, 1, 1); } //绘制验证码 int codeY = height - 10; //设置字体颜色和样式 g.setColor(new Color(19,148,246)); g.setFont(new Font("Georgia", Font.BOLD, fSize)); for(int i = 0; i < codeLength;i++){ g.drawString(String.valueOf(securityCode.charAt(i)), i * 16 + 5, codeY); } //关闭资源 g.dispose(); return image; } /** * 返回验证码图片的流格式 * @param securityCode 验证码 * @return ByteArrayInputStream 图片流 */ public static ByteArrayInputStream getImageAsInputStream(String securityCode){ BufferedImage image = createImage(securityCode); return convertImageToStream(image); } /** * 将BufferedImage转换成ByteArrayInputStream * @param image 图片 * @return ByteArrayInputStream 流 */ private static ByteArrayInputStream convertImageToStream(BufferedImage image){ ByteArrayInputStream inputStream = null; ByteArrayOutputStream bos = new ByteArrayOutputStream(); JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(bos); try { jpeg.encode(image); byte[] bts = bos.toByteArray(); inputStream = new ByteArrayInputStream(bts); } catch (ImageFormatException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return inputStream; } }
4.
package code; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class CodeAction extends ActionSupport{ HttpServletRequest request = ServletActionContext.getRequest(); HttpSession session=request.getSession(); HttpServletResponse response = ServletActionContext.getResponse(); public String execute(){ try { response.setContentType("text/html;charset=utf-8"); request.setCharacterEncoding("utf-8"); String validateC = (String) request.getSession().getAttribute("SESSION_SECURITY_CODE"); System.out.println("validateC"+validateC); String veryCode = request.getParameter("code"); System.out.println("c"+veryCode); PrintWriter out; out = response.getWriter(); if(veryCode==null||"".equals(veryCode)){ //response.sendRedirect(refer); out.print("验证码不能为空"); System.out.println("验证码不能为空"); } else{ if(validateC.equals(veryCode)){ out.print("验证码正确"); //request.getRequestDispatcher("ServletTo").forward(request, response); System.out.println("验证码正确"); }else{ out.print("验证码错误"); System.out.println("验证码错误"); } } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } }
