java验证码图片生成

来源：互联网发布：淘宝如何图片搜索编辑：程序博客网时间：2024/06/05 07:04
代码：
import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.util.Random;import javax.imageio.ImageIO;import javax.imageio.stream.ImageOutputStream;import cn.ruis.rscms.action.base.BaseAction;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class RandomPictureAction extends BaseAction { private static final long serialVersionUID = -6950908478971552308L;        private ByteArrayInputStream inputStream;        public String execute() throws Exception {          // 在内存中创建图象          int width = 65, height = 20;            BufferedImage image = new BufferedImage(width, height,                  BufferedImage.TYPE_INT_RGB);            // 获取图形上下文          Graphics g = image.getGraphics();            // 生成随机类          Random random = new Random();            // 设定背景色          g.setColor(getRandColor(200, 250));          g.fillRect(0, 0, width, height);            // 设定字体          g.setFont(new Font("Times New Roman", Font.PLAIN, 18));            // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到          g.setColor(getRandColor(160, 200));          for (int i = 0; i < 155; i++) {              int x = random.nextInt(width);              int y = random.nextInt(height);              int xl = random.nextInt(12);              int yl = random.nextInt(12);              g.drawLine(x, y, x + xl, y + yl);          }            // 取随机产生的认证码(6位数字)          String sRand = "";          for (int i = 0; i < 4; i++) {              String rand = String.valueOf(random.nextInt(10));              sRand += rand;              // 将认证码显示到图象中              g.setColor(new Color(20 + random.nextInt(110), 20 + random                      .nextInt(110), 20 + random.nextInt(110)));              // 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成              g.drawString(rand, 13 * i + 6, 16);          }            // 将认证码存入SESSION          session.put("rand", sRand);          System.out.println("=========>"+session.get("rand"));          // 图象生效          g.dispose();          ByteArrayOutputStream output = new ByteArrayOutputStream();          ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);          ImageIO.write(image, "JPEG", imageOut);          imageOut.close();          ByteArrayInputStream input = new ByteArrayInputStream(output                  .toByteArray());          this.setInputStream(input);                  return SUCCESS;      }        /*      * 给定范围获得随机颜色      */      private Color getRandColor(int fc, int bc) {          Random random = new Random();          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);      }        public void setInputStream(ByteArrayInputStream inputStream) {          this.inputStream = inputStream;      }        public ByteArrayInputStream getInputStream() {          return inputStream;      }  }
0 0