验证码VerifyCode

 1 package com.xjs.image;  2  3 import java.awt.BasicStroke;  4 import java.awt.Color;  5 import java.awt.Font;  6 import java.awt.Graphics2D;  7 import java.awt.image.BufferedImage;  8 import java.io.IOException;  9 import java.io.OutputStream;  10 import java.util.Random;  11  12 import javax.imageio.ImageIO;  13  14 public class VerifyCode {  15 private int w = 70;  16 private int h = 35;  17 private Random r = new Random();  18 // {"宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312"}  19 private String[] fontNames = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"};  20 // 可选字符  21 private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";  22 // 背景色  23 private Color bgColor = new Color(255, 255, 255);  24 // 验证码上的文本  25 private String text ;  26  27 // 生成随机的颜色  28 private Color randomColor () {  29 int red = r.nextInt(150);  30 int green = r.nextInt(150);  31 int blue = r.nextInt(150);  32 return new Color(red, green, blue);  33  }  34  35 // 生成随机的字体  36 private Font randomFont () {  37 int index = r.nextInt(fontNames.length);  38 String fontName = fontNames[index];//生成随机的字体名称  39 int style = r.nextInt(4);//生成随机的样式, 0(无样式), 1(粗体), 2(斜体), 3(粗体+斜体)  40 int size = r.nextInt(5) + 24; //生成随机字号, 24 ~ 28  41 return new Font(fontName, style, size);  42  }  43  44 // 画干扰线  45 private void drawLine (BufferedImage image) {  46 int num = 3;//一共画3条  47 Graphics2D g2 = (Graphics2D)image.getGraphics();  48 for(int i = 0; i < num; i++) {//生成两个点的坐标，即4个值  49 int x1 = r.nextInt(w);  50 int y1 = r.nextInt(h);  51 int x2 = r.nextInt(w);  52 int y2 = r.nextInt(h);  53 g2.setStroke(new BasicStroke(1.5F));  54 g2.setColor(Color.BLUE); //干扰线是蓝色  55 g2.drawLine(x1, y1, x2, y2);//画线  56  }  57  }  58  59 // 随机生成一个字符  60 private char randomChar () {  61 int index = r.nextInt(codes.length());  62 return codes.charAt(index);  63  }  64  65 // 创建BufferedImage  66 private BufferedImage createImage () {  67 BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);  68 Graphics2D g2 = (Graphics2D)image.getGraphics();  69 g2.setColor(this.bgColor);  70 g2.fillRect(0, 0, w, h);  71 return image;  72  }  73  74 // 调用这个方法得到验证码  75 public BufferedImage getImage () {  76 BufferedImage image = createImage();//创建图片缓冲区   77 Graphics2D g2 = (Graphics2D)image.getGraphics();//得到绘制环境  78 StringBuilder sb = new StringBuilder();//用来装载生成的验证码文本  79 // 向图片中画4个字符  80 for(int i = 0; i < 4; i++) {//循环四次，每次生成一个字符  81 String s = randomChar() + "";//随机生成一个字母   82 sb.append(s); //把字母添加到sb中  83 float x = i * 1.0F * w / 4; //设置当前字符的x轴坐标  84 g2.setFont(randomFont()); //设置随机字体  85 g2.setColor(randomColor()); //设置随机颜色  86 g2.drawString(s, x, h-5); //画图  87  }  88 this.text = sb.toString(); //把生成的字符串赋给了this.text  89 drawLine(image); //添加干扰线  90 return image;  91  }  92  93 // 返回验证码图片上的文本  94 public String getText () {  95 return text;  96  }  97  98 // 保存图片到指定的输出流  99 public static void output (BufferedImage image, OutputStream out) 100  throws IOException { 101 ImageIO.write(image, "JPEG", out); 102  } 103 }

 1 import java.awt.image.BufferedImage;  2 import java.io.FileNotFoundException;  3 import java.io.FileOutputStream;  4 import java.io.IOException;  5  6 import org.junit.Test;  7  8 public class Demo {  9  @Test 10 public void fun1() throws FileNotFoundException, IOException{ 11 VerifyCode vc=new VerifyCode(); 12 BufferedImage bi=vc.getImage();//得到验证码图片，是一个BufferedImage类型的 13 VerifyCode.output(bi, new FileOutputStream("F://VerifyCode.jpg")); 14 15 System.out.println(vc.getText()); 16  } 17 }