随机数图片验证码

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util

package util ;    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;  public class RandomNumUtil {      private ByteArrayInputStream image;//图像      private String str;//验证码        private RandomNumUtil(){          init();//初始化属性      }      /*    * 取得RandomNumUtil实例    */      public static RandomNumUtil Instance(){      return new RandomNumUtil();      }      /*    * 取得验证码图片    */      public ByteArrayInputStream getImage(){      return this.image;      }      /*    * 取得图片的验证码    */      public String getString(){      return this.str;      }          private void init() {      // 在内存中创建图象      int width=85, 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);      }     //赋值验证码     this.str=sRand;          //图象生效      g.dispose();      ByteArrayInputStream input=null;      ByteArrayOutputStream output = new ByteArrayOutputStream();      try{      ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);      ImageIO.write(image, "JPEG", imageOut);      imageOut.close();      input = new ByteArrayInputStream(output.toByteArray());      }catch(Exception e){      System.out.println("验证码图片产生出现错误："+e.toString());      }          this.image=input;/* 赋值图像 */      }      /*    * 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);      }     }

action

package action;import java.io.ByteArrayInputStream;import com.opensymphony.xwork2.ActionContext;import util.RandomNumUtil;public class RandomAction {private ByteArrayInputStream inputStream;//生成验证码方法public String execute()throws Exception{RandomNumUtil r = RandomNumUtil.Instance();this.setInputStream(r.getImage());ActionContext.getContext().getSession().put("random", r.getString());return "success";}public ByteArrayInputStream getInputStream() {return inputStream;}public void setInputStream(ByteArrayInputStream inputStream) {this.inputStream = inputStream;}}

struts2

<action name="random" class="action.RandomAction"><result type="stream"><param name="contentType">image/jpeg</param><param name="inputName">inputStream</param></result></action>

jsp

<input type="text" name="random" size="6" /><img src="random.action" title="点击图片刷新验证码" onclick="changeValidateCode(this)"/>

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