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　　验证码：2　　3　　                          //这里是对应生成图片的action4　　　　5　　

4。struts2的配置

1 　　
     
      2             
      
       /common/{1}.jsp
      3         
     4     

 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）