java的圖片驗證碼

時間 2019-11-20

標籤 java 圖片驗證碼欄目 Java 简体版

原文原文鏈接

1.驗證碼生成工具類java

  1 package cn.bd.jboa.util;
  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.util.Random;
 10 import javax.imageio.ImageIO;
 11 import javax.imageio.stream.ImageOutputStream;
 12 
 13 public class RandomNumUtil {
 14     private ByteArrayInputStream image;// 圖像
 15     private String str;// 驗證碼
 16 
 17     private RandomNumUtil() {
 18         init();// 初始化屬性
 19     }
 20 
 21     /*
 22      * 取得RandomNumUtil實例
 23      */
 24     public static RandomNumUtil Instance() {
 25         return new RandomNumUtil();
 26     }
 27 
 28     /*
 29      * 取得驗證碼圖片
 30      */
 31     public ByteArrayInputStream getImage() {
 32         return this.image;
 33     }
 34 
 35     /*
 36      * 取得圖片的驗證碼
 37      */
 38     public String getString() {
 39         return this.str;
 40     }
 41 
 42     private void init() {
 43         // 在內存中建立圖象
 44         int width = 85, height = 20;
 45         BufferedImage image = new BufferedImage(width, height,
 46                 BufferedImage.TYPE_INT_RGB);
 47         // 獲取圖形上下文
 48         Graphics g = image.getGraphics();
 49         // 生成隨機類
 50         Random random = new Random();
 51         // 設定背景色
 52         g.setColor(getRandColor(200, 250));
 53         g.fillRect(0, 0, width, height);
 54         // 設定字體
 55         g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
 56         // 隨機產生155條幹擾線，使圖象中的認證碼不易被其它程序探測到
 57         g.setColor(getRandColor(160, 200));
 58         for (int i = 0; i < 155; i++) {
 59             int x = random.nextInt(width);
 60             int y = random.nextInt(height);
 61             int xl = random.nextInt(12);
 62             int yl = random.nextInt(12);
 63             g.drawLine(x, y, x + xl, y + yl);
 64         }
 65         // 取隨機產生的認證碼(6位數字)
 66         String sRand = "";
 67         for (int i = 0; i < 6; i++) {
 68             String rand = String.valueOf(random.nextInt(10));
 69             sRand += rand;
 70             // 將認證碼顯示到圖象中
 71             g.setColor(new Color(20 + random.nextInt(110), 20 + random
 72                     .nextInt(110), 20 + random.nextInt(110)));
 73             // 調用函數出來的顏色相同，多是由於種子太接近，因此只能直接生成
 74             g.drawString(rand, 13 * i + 6, 16);
 75         }
 76         // 賦值驗證碼
 77         this.str = sRand;
 78 
 79         // 圖象生效
 80         g.dispose();
 81         ByteArrayInputStream input = null;
 82         ByteArrayOutputStream output = new ByteArrayOutputStream();
 83         try {
 84             ImageOutputStream imageOut = ImageIO
 85                     .createImageOutputStream(output);
 86             ImageIO.write(image, "JPEG", imageOut);
 87             imageOut.close();
 88             input = new ByteArrayInputStream(output.toByteArray());
 89         } catch (Exception e) {
 90             System.out.println("驗證碼圖片產生出現錯誤：" + e.toString());
 91         }
 92 
 93         this.image = input;/* 賦值圖像 */
 94     }
 95 
 96     /*
 97      * 給定範圍得到隨機顏色
 98      */
 99     private Color getRandColor(int fc, int bc) {
100         Random random = new Random();
101         if (fc > 255)
102             fc = 255;
103         if (bc > 255)
104             bc = 255;
105         int r = fc + random.nextInt(bc - fc);
106         int g = fc + random.nextInt(bc - fc);
107         int b = fc + random.nextInt(bc - fc);
108         return new Color(r, g, b);
109     }
110 }

2.actionjson

 1 package cn.bd.jboa.action;
 2 
 3 import java.io.ByteArrayInputStream;
 4 import cn.bd.jboa.util.RandomNumUtil;
 5 import com.opensymphony.xwork2.ActionContext;
 6 import com.opensymphony.xwork2.ActionSupport;
 7 
 8 /**
 9  * 驗證碼
10  * @author TaoXianXue
11  *
12  */
13 public class RandomAction extends ActionSupport {
14 
15     private static final long serialVersionUID = 1L;
16     private ByteArrayInputStream inputStream;
17 
18     // 生成驗證碼方法
19     public String execute() throws Exception {
20         RandomNumUtil rdnu = RandomNumUtil.Instance();
21         this.setInputStream(rdnu.getImage());/// 取得帶有隨機字符串的圖片
22         ActionContext.getContext().getSession().put("random", rdnu.getString());//把驗證碼放入HttpSession中
23         return "random";
24     }
25 
26     public void setInputStream(ByteArrayInputStream inputStream) {
27         this.inputStream = inputStream;
28     }
29 
30     public ByteArrayInputStream getInputStream() {
31         return inputStream;
32     }
33 }

3.struts.xmldom

 1     <!-- 驗證碼操做Action配置 -->
 2     <package name="random" extends="json-default">
 3         <!-- Random驗證碼 -->
 4         <action name="random" class="randomAction">
 5             <result type="stream" name="random">
 6                 <param name="contentType">image/jpeg</param>
 7                 <param name="inputName">inputStream</param>
 8             </result>
 9         </action>
10     </package>