struts2的配置 和代码
1.生成图片流
类名：VerifyCodeUtils
1 /** 2 * 生成图片流 3 * @author Administrator 4 * 5 */ 6 import java.awt.Color; 7 import java.awt.Font; 8 import java.awt.Graphics; 9 import java.awt.Graphics2D; 10 import java.awt.RenderingHints; 11 import java.awt.geom.AffineTransform; 12 import java.awt.image.BufferedImage; 13 import java.io.File; 14 import java.io.FileOutputStream; 15 import java.io.IOException; 16 import java.io.OutputStream; 17 import java.util.Arrays; 18 import java.util.Random; 19 20 import javax.imageio.ImageIO; 21 22 public class VerifyCodeUtils{ 23 24 //使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符 25 public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; 26 private static Random random = new Random(); 27 28 29 /** 30 * 使用系统默认字符源生成验证码 31 * @param verifySize 验证码长度 32 * @return 33 */ 34 public static String generateVerifyCode(int verifySize){ 35 return generateVerifyCode(verifySize, VERIFY_CODES); 36 } 37 /** 38 * 使用指定源生成验证码 39 * @param verifySize 验证码长度 40 * @param sources 验证码字符源 41 * @return 42 */ 43 public static String generateVerifyCode(int verifySize, String sources){ 44 if(sources == null || sources.length() == 0){ 45 sources = VERIFY_CODES; 46 } 47 int codesLen = sources.length(); 48 Random rand = new Random(System.currentTimeMillis()); 49 StringBuilder verifyCode = new StringBuilder(verifySize); 50 for(int i = 0; i < verifySize; i++){ 51 verifyCode.append(sources.charAt(rand.nextInt(codesLen-1))); 52 } 53 return verifyCode.toString(); 54 } 55 56 /** 57 * 生成随机验证码文件,并返回验证码值 58 * @param w 59 * @param h 60 * @param outputFile 61 * @param verifySize 62 * @return 63 * @throws IOException 64 */ 65 public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{ 66 String verifyCode = generateVerifyCode(verifySize); 67 outputImage(w, h, outputFile, verifyCode); 68 return verifyCode; 69 } 70 71 /** 72 * 输出随机验证码图片流,并返回验证码值 73 * @param w 74 * @param h 75 * @param os 76 * @param verifySize 77 * @return 78 * @throws IOException 79 */ 80 public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{ 81 String verifyCode = generateVerifyCode(verifySize); 82 outputImage(w, h, os, verifyCode); 83 return verifyCode; 84 } 85 86 /** 87 * 生成指定验证码图像文件 88 * @param w 89 * @param h 90 * @param outputFile 91 * @param code 92 * @throws IOException 93 */ 94 public static void outputImage(int w, int h, File outputFile, String code) throws IOException{ 95 if(outputFile == null){ 96 return; 97 } 98 File dir = outputFile.getParentFile(); 99 if(!dir.exists()){100 dir.mkdirs();101 }102 try{103 outputFile.createNewFile();104 FileOutputStream fos = new FileOutputStream(outputFile);105 outputImage(w, h, fos, code);106 fos.close();107 } catch(IOException e){108 throw e;109 }110 }111 112 /**113 * 输出指定验证码图片流114 * @param w115 * @param h116 * @param os117 * @param code118 * @throws IOException119 */120 public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{121 int verifySize = code.length();122 BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);123 Random rand = new Random();124 Graphics2D g2 = image.createGraphics();125 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);126 Color[] colors = new Color[5];127 Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,128 Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,129 Color.PINK, Color.YELLOW };130 float[] fractions = new float[colors.length];131 for(int i = 0; i < colors.length; i++){132 colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];133 fractions[i] = rand.nextFloat();134 }135 Arrays.sort(fractions);136 137 g2.setColor(Color.GRAY);// 设置边框色138 g2.fillRect(0, 0, w, h);139 140 Color c = getRandColor(200, 250);141 g2.setColor(c);// 设置背景色142 g2.fillRect(0, 2, w, h-4);143 144 //绘制干扰线145 Random random = new Random();146 g2.setColor(getRandColor(160, 200));// 设置线条的颜色147 for (int i = 0; i < 20; i++) {148 int x = random.nextInt(w - 1);149 int y = random.nextInt(h - 1);150 int xl = random.nextInt(6) + 1;151 int yl = random.nextInt(12) + 1;152 g2.drawLine(x, y, x + xl + 40, y + yl + 20);153 }154 155 // 添加噪点156 float yawpRate = 0.05f;// 噪声率157 int area = (int) (yawpRate * w * h);158 for (int i = 0; i < area; i++) {159 int x = random.nextInt(w);160 int y = random.nextInt(h);161 int rgb = getRandomIntColor();162 image.setRGB(x, y, rgb);163 }164 165 shear(g2, w, h, c);// 使图片扭曲166 167 g2.setColor(getRandColor(100, 160));168 int fontSize = h-4;169 Font font = new Font("Algerian", Font.ITALIC, fontSize);170 g2.setFont(font);171 char[] chars = code.toCharArray();172 for(int i = 0; i < verifySize; i++){173 AffineTransform affine = new AffineTransform();174 affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);175 g2.setTransform(affine);176 g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);177 }178 179 g2.dispose();180 ImageIO.write(image, "jpg", os);181 }182 183 private static Color getRandColor(int fc, int bc) {184 if (fc > 255)185 fc = 255;186 if (bc > 255)187 bc = 255;188 int r = fc + random.nextInt(bc - fc);189 int g = fc + random.nextInt(bc - fc);190 int b = fc + random.nextInt(bc - fc);191 return new Color(r, g, b);192 }193 194 private static int getRandomIntColor() {195 int[] rgb = getRandomRgb();196 int color = 0;197 for (int c : rgb) {198 color = color << 8;199 color = color | c;200 }201 return color;202 }203 204 private static int[] getRandomRgb() {205 int[] rgb = new int[3];206 for (int i = 0; i < 3; i++) {207 rgb[i] = random.nextInt(255);208 }209 return rgb;210 }211 212 private static void shear(Graphics g, int w1, int h1, Color color) {213 shearX(g, w1, h1, color);214 shearY(g, w1, h1, color);215 }216 217 private static void shearX(Graphics g, int w1, int h1, Color color) {218 219 int period = random.nextInt(2);220 221 boolean borderGap = true;222 int frames = 1;223 int phase = random.nextInt(2);224 225 for (int i = 0; i < h1; i++) {226 double d = (double) (period >> 1)227 * Math.sin((double) i / (double) period228 + (6.2831853071795862D * (double) phase)229 / (double) frames);230 g.copyArea(0, i, w1, 1, (int) d, 0);231 if (borderGap) {232 g.setColor(color);233 g.drawLine((int) d, i, 0, i);234 g.drawLine((int) d + w1, i, w1, i);235 }236 }237 238 }239 240 private static void shearY(Graphics g, int w1, int h1, Color color) {241 242 int period = random.nextInt(40) + 10; // 50;243 244 boolean borderGap = true;245 int frames = 20;246 int phase = 7;247 for (int i = 0; i < w1; i++) {248 double d = (double) (period >> 1)249 * Math.sin((double) i / (double) period250 + (6.2831853071795862D * (double) phase)251 / (double) frames);252 g.copyArea(i, 0, 1, h1, 0, (int) d);253 if (borderGap) {254 g.setColor(color);255 g.drawLine(i, (int) d, i, 0);256 g.drawLine(i, (int) d + h1, i, h1);257 }258 259 }260 261 }262 public static void main(String[] args) throws IOException{263 File dir = new File("F:/verifies");264 int w = 200, h = 80;265 266 String verifyCode = generateVerifyCode(4);267 File file = new File(dir, verifyCode + ".jpg");268 outputImage(w, h, file, verifyCode);269 }270 } 2.图片生成的类：
类名:CommonAction
1 package cn.xxx.common.test; 2 3 import java.io.IOException; 4 5 import javax.servlet.http.HttpSession; 6 7 import org.springframework.context.annotation.Scope; 8 import org.springframework.stereotype.Component; 9 10 import cn.sxt.common.action.BaseAction;11 @Component("commonAction")12 @Scope("prototype")13 public class CommonAction{14 /**15 * 生成随机图片 验证码16 * @return17 * @throws IOException18 */ //randImg方法 （JSP页面 a标签的src访问此方法）19 public String randImg() throws IOException{20 response.setHeader("Pragma", "No-cache");21 response.setHeader("Cache-Control", "no-cache");22 response.setDateHeader("Expires", 0);23 response.setContentType("image/jpeg");24 25 //生成随机字串26 String verifyCode = VerifyCodeUtils.generateVerifyCode(4);27 //存入会话session28 HttpSession session = request.getSession(true);29 session.setAttribute("rand", verifyCode.toLowerCase());30 //生成图片31 int w = 200, h = 80;32 VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode);33 return null;34 }35 } 3:JSP页面展示页
Login.jsp
1 2 3 //这里是对应生成图片的action45
4。struts2的配置
12 4/common/{1}.jsp 3
注意：
/common/{1}.jsp 是把图片输出到的Jsp页面。 需要创建一个空的JSP页面（直接创建jsp页面即可。名字一定要正确）