- 創建工具類：生成一個可成一張圖片的工具類:代碼如下(附錄)可以直使用
- 創建另一個工具類：隨機生成數字字母的組合：
- 代碼如下：
package com.bjsxt.lc.util;
import java.util.Random;
public class RandomString
{
public static String randomCode(int size)
{
//用來存儲驗證碼
StringBuffer code = new StringBuffer();
String sourceStr = "123456789abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ";
Random random = new Random();
for(int i=0; i<size; i++)
{
code.append(sourceStr.charAt(random.nextInt(30))+"");
}
return code.toString();
}
//測試方法
public static void main(String[] args)
{
for(int i=0; i<40; i++)
{
String code = randomCode(4);
System.out.println(code);
}
}
}
3 創建action其中調用兩個工具類
outputImage(int w, int h, OutputStream os, String code)方法，- 參數說明：
- w：img的寬
- H：img的高
- os：img的輸出流
- os:片上的驗證碼
- 創建一個action(struts2框架)
- 將os輸出流直接堆到response.getOutputStream()上，輸出到網頁，這時應當將返回值置爲空，
- 參數說明：
代碼
package com.bjsxt.lc.action;
import java.io.IOException;
import org.apache.catalina.deploy.ContextResource;
import org.apache.struts2.ServletActionContext;
import com.bjsxt.lc.action.BasicAction;
import com.bjsxt.lc.util.RandomString;
import com.bjsxt.lc.util.VerifyCodeUtils;
/**
* 一些公共的Action
* @author Administrator
*
*/
public class CommonAction extends BasicAction
{
/**
*
*/
private static final long serialVersionUID = 1L;
/***
* 生成驗證驗
* @return
*/
public String veritfCode()
{
// logger.info("--veritfCode--");
String code = RandomString.randomCode(4);
request.getSession().setAttribute("code", code);
try
{
VerifyCodeUtils.outputImage(120,80,response.getOutputStream(),code);
} catch (Exception e)
{
logger.info("-------------------------");
e.printStackTrace();
}
return null;
}
}
<div class="form-group">
<label for="email" class="col-sm-2 control-label">驗證碼</label>
<div class="col-sm-8">
<div class="input-group">
<span class="input-group-addon"> <a href="#" tabindex="-1"
οnclick="return refreshCode('imgCode');">
<img id="imgCode" src="${pageContext.request.contextPath}/common_veritfCode.htm" οnclick="" title="點擊刷新驗證碼" width="75" height="20" />
</a>
</span> <input type="text" id="code" name="code" class="form-control"
placeholder="驗證碼">
</div>
</div>
</div>function refreshCode(imgCode)
{
var dom = $("#"+imgCode);
dom.attr("src","/auth_mana1/common_veritfCode.htm?new="+new Date());
return false;
}附錄：生成隨機驗證圖片的代碼(從網上copy的)
package com.bjsxt.lc.util; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.LinearGradientPaint; import java.awt.Paint; import java.awt.RenderingHints; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Arrays; import java.util.Random; import javax.imageio.ImageIO; public class VerifyCodeUtils { // 使用到Algerian字體，系統裏沒有的話需要安裝字體，字體只顯示大寫，去掉了1,0,i,o幾個容易混淆的字符 public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; private static Random random = new Random(); /** * 使用系統默認字符源生成驗證碼 * * @param verifySize * 驗證碼長度 * @return */ public static String generateVerifyCode(int verifySize) { return generateVerifyCode(verifySize, VERIFY_CODES); } /** * 使用指定源生成驗證碼 * * @param verifySize * 驗證碼長度 * @param sources * 驗證碼字符源 * @return */ public static String generateVerifyCode(int verifySize, String sources) { if (sources == null || sources.length() == 0) { sources = VERIFY_CODES; } int codesLen = sources.length(); Random rand = new Random(System.currentTimeMillis()); StringBuilder verifyCode = new StringBuilder(verifySize); for (int i = 0; i < verifySize; i++) { verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1))); } return verifyCode.toString(); } /** * 生成隨機驗證碼文件,並返回驗證碼值 * * @param w * @param h * @param outputFile * @param verifySize * @return * @throws IOException */ public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException { String verifyCode = generateVerifyCode(verifySize); outputImage(w, h, outputFile, verifyCode); return verifyCode; } /** * 輸出隨機驗證碼圖片流,並返回驗證碼值 * * @param w * @param h * @param os * @param verifySize * @return * @throws IOException */ public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException { String verifyCode = generateVerifyCode(verifySize); outputImage(w, h, os, verifyCode); return verifyCode; } /** * 生成指定驗證碼圖像文件 * * @param w * @param h * @param outputFile * @param code * @throws IOException */ public static void outputImage(int w, int h, File outputFile, String code) throws IOException { if (outputFile == null) { return; } File dir = outputFile.getParentFile(); if (!dir.exists()) { dir.mkdirs(); } try { outputFile.createNewFile(); FileOutputStream fos = new FileOutputStream(outputFile); outputImage(w, h, fos, code); fos.close(); } catch (IOException e) { throw e; } } /** * 輸出指定驗證碼圖片流 * * @param w * @param h * @param os * @param code * @throws IOException */ public static void outputImage(int w, int h, OutputStream os, String code) throws IOException { int verifySize = code.length(); BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Random rand = new Random(); Graphics2D g2 = image.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); Color[] colors = new Color[5]; Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK, Color.YELLOW }; float[] fractions = new float[colors.length]; for (int i = 0; i < colors.length; i++) { colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)]; fractions[i] = rand.nextFloat(); } Arrays.sort(fractions); g2.setColor(Color.GRAY);// 設置邊框色 g2.fillRect(0, 0, w, h); Color c = getRandColor(200, 250); g2.setColor(c);// 設置背景色 g2.fillRect(0, 2, w, h - 4); // 繪製干擾線 Random random = new Random(); g2.setColor(getRandColor(160, 200));// 設置線條的顏色 for (int i = 0; i < 20; i++) { int x = random.nextInt(w - 1); int y = random.nextInt(h - 1); int xl = random.nextInt(6) + 1; int yl = random.nextInt(12) + 1; g2.drawLine(x, y, x + xl + 40, y + yl + 20); } // 添加噪點 float yawpRate = 0.05f;// 噪聲率 int area = (int) (yawpRate * w * h); for (int i = 0; i < area; i++) { int x = random.nextInt(w); int y = random.nextInt(h); int rgb = getRandomIntColor(); image.setRGB(x, y, rgb); } shear(g2, w, h, c);// 使圖片扭曲 g2.setColor(getRandColor(100, 160)); int fontSize = h - 4; Font font = new Font("Algerian", Font.ITALIC, fontSize); g2.setFont(font); char[] chars = code.toCharArray(); for (int i = 0; i < verifySize; i++) { AffineTransform affine = new AffineTransform(); affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize / 2, h / 2); g2.setTransform(affine); g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10); } g2.dispose(); ImageIO.write(image, "jpg", os); } private static Color getRandColor(int fc, int bc) { if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc + random.nextInt(bc - fc); int g = fc + random.nextInt(bc - fc); int b = fc + random.nextInt(bc - fc); return new Color(r, g, b); } private static int getRandomIntColor() { int[] rgb = getRandomRgb(); int color = 0; for (int c : rgb) { color = color << 8; color = color | c; } return color; } private static int[] getRandomRgb() { int[] rgb = new int[3]; for (int i = 0; i < 3; i++) { rgb[i] = random.nextInt(255); } return rgb; } private static void shear(Graphics g, int w1, int h1, Color color) { shearX(g, w1, h1, color); shearY(g, w1, h1, color); } private static void shearX(Graphics g, int w1, int h1, Color color) { int period = random.nextInt(2); boolean borderGap = true; int frames = 1; int phase = random.nextInt(2); for (int i = 0; i < h1; i++) { double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames); g.copyArea(0, i, w1, 1, (int) d, 0); if (borderGap) { g.setColor(color); g.drawLine((int) d, i, 0, i); g.drawLine((int) d + w1, i, w1, i); } } } private static void shearY(Graphics g, int w1, int h1, Color color) { int period = random.nextInt(40) + 10; // 50; boolean borderGap = true; int frames = 20; int phase = 7; for (int i = 0; i < w1; i++) { double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames); g.copyArea(i, 0, 1, h1, 0, (int) d); if (borderGap) { g.setColor(color); g.drawLine(i, (int) d, i, 0); g.drawLine(i, (int) d + h1, i, h1); } } } public static void main(String[] args) throws IOException { File dir = new File("F:/verifies"); int w = 200, h = 80; for (int i = 0; i < 2; i++) { String verifyCode = generateVerifyCode(4); File file = new File(dir, verifyCode + ".jpg"); outputImage(w, h, file, verifyCode); } } }