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代码如下： import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.OutputStream;import java.util.Random;import javax.imageio.ImageIO;public class VerifyCode { private int w = 70; private int h = 35; private Random r = new Random(); // {'宋体', '华文楷体', '黑体', '华文新魏', '华文隶书', '微软雅黑', '楷体_GB2312'} private String[] fontNames = {'宋体', '华文楷体', '黑体', '微软雅黑', '楷体_GB2312'}; // 可选字符 private String codes = '23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ'; // 背景色 private Color bgColor = new Color(255, 255, 255); // 验证码上的文本 private String text ; // 生成随机的颜色 private Color randomColor () { int red = r.nextInt(150); int green = r.nextInt(150); int blue = r.nextInt(150); return new Color(red, green, blue); } // 生成随机的字体 private Font randomFont () { int index = r.nextInt(fontNames.length); String fontName = fontNames[index];//生成随机的字体名称 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) int size = r.nextInt(5) + 24; //生成随机字号, 24 ~ 28 return new Font(fontName, style, size); } // 画干扰线 private void drawLine (BufferedImage image) { int num = 3;//一共画3条 Graphics2D g2 = (Graphics2D)image.getGraphics(); for(int i = 0; i < num; i++) {//生成两个点的坐标，即4个值 int x1 = r.nextInt(w); int y1 = r.nextInt(h); int x2 = r.nextInt(w); int y2 = r.nextInt(h); g2.setStroke(new BasicStroke(1.5F)); g2.setColor(Color.BLUE); //干扰线是蓝色 g2.drawLine(x1, y1, x2, y2);//画线 } } // 随机生成一个字符 private char randomChar () { int index = r.nextInt(codes.length()); return codes.charAt(index); } // 创建BufferedImage private BufferedImage createImage () { BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = (Graphics2D)image.getGraphics(); g2.setColor(this.bgColor); g2.fillRect(0, 0, w, h); return image; } // 调用这个方法得到验证码 public BufferedImage getImage () { BufferedImage image = createImage();//创建图片缓冲区 Graphics2D g2 = (Graphics2D)image.getGraphics();//得到绘制环境 StringBuilder sb = new StringBuilder();//用来装载生成的验证码文本 // 向图片中画4个字符 for(int i = 0; i < 4; i++) {//循环四次，每次生成一个字符 String s = randomChar() + '';//随机生成一个字母 sb.append(s); //把字母添加到sb中 float x = i * 1.0F * w / 4; //设置当前字符的x轴坐标 g2.setFont(randomFont()); //设置随机字体 g2.setColor(randomColor()); //设置随机颜色 g2.drawString(s, x, h-5); //画图 } this.text = sb.toString(); //把生成的字符串赋给了this.text drawLine(image); //添加干扰线 return image; } // 返回验证码图片上的文本 public String getText () { return text; } // 保存图片到指定的输出流 public static void output (BufferedImage image, OutputStream out) throws IOException { ImageIO.write(image, 'JPEG', out); }}
使用如下： package cn.itcast.image;import java.awt.Color;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import javax.imageio.ImageIO;import org.junit.Test;/** * 动态生成图片 * @author cxf * */public class Demo { @Test public void fun1() throws FileNotFoundException, IOException { /* * 1. 创建图片缓冲区 * 2. 设置其宽高 * 3. 得到这个图片的绘制环境（得到画笔） * 4. 保存起来 */ BufferedImage bi = new BufferedImage(70, 35, BufferedImage.TYPE_INT_RGB); Graphics2D g = (Graphics2D)bi.getGraphics();//得到绘制环境 g.setColor(Color.WHITE);//把环境设置为白色 g.fillRect(0, 0, 70, 35);//填充矩形！填充矩形，从0,0点开始，宽70，高35，即整个图片，即为图片设置背景色 g.setColor(Color.RED);//把环境设置为红色 g.drawString('Hello', 2, 35-2);//向图片上写入字符串，其中2,2表示x,y轴的坐标 ImageIO.write(bi, 'JPEG', new FileOutputStream('F:/xxx.jpg')); } @Test public void fun2() throws FileNotFoundException, IOException { VerifyCode vc = new VerifyCode(); BufferedImage bi = vc.getImage(); VerifyCode.output(bi, new FileOutputStream('F:/xxx.jpg')); System.out.println(vc.getText()); }}
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