Struts2中实现随机验证码

时间：2024-11-11 23:37:14

一.创建RandomNum类

  1: import java.awt.Color;



  2: import java.awt.Font;



  3: import java.awt.Graphics;



  4: import java.awt.image.BufferedImage;



  5: import java.io.ByteArrayInputStream;



  6: import java.io.ByteArrayOutputStream;



  7: import java.io.IOException;



  8: import java.util.Random;



  9: import javax.imageio.ImageIO;



 10: import javax.imageio.stream.ImageOutputStream;



 11:



 12: public class RandomNumUtil {



 13:  private ByteArrayInputStream image; //字节流输出图像



 14:  private String str; //随机数组成的字符串



 15:



 16:  public void setImage(ByteArrayInputStream image) {



 17:   this.image = image;



 18:  }



 19:



 20:  public void setStr(String str) {



 21:   this.str = str;



 22:  }



 23:



 24:  private RandomNumUtil(){



 25:   init();//初始化属性



 26:  }



 27:  /*



 28:   * 取得RandomNumUtil实例



 29:   */



 30:  public static RandomNumUtil Instance() {



 31:   return new RandomNumUtil();



 32:  }



 33:  /*



 34:   * 取得验证码图片



 35:   */



 36:  public ByteArrayInputStream getImage() {



 37:   return image;



 38:  }



 39:  /*



 40:   * 取得图片的验证码



 41:   */



 42:  public String getStr() {



 43:   return str;



 44:  }



 45:  /*



 46:   * init()方法，为字节流赋值



 47:   */



 48:  private void init(){



 49:   //在内存中创建图像



 50:   int width=85,height=20;



 51:   BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);



 52:   //获取图形上下文



 53:   Graphics g=image.getGraphics();



 54:   //生成随机类



 55:   Random random=new Random();



 56:   //设定背景色



 57:   g.setColor(getRandColor(200,250));



 58:   g.fillRect(0, 0, width, height);



 59:   //设定字体



 60:   g.setFont(new Font("Times New Roman",Font.PLAIN,18));



 61:   //随机产生155条干扰线，使图像中的认证码不易被其它程序探测到



 62:   g.setColor(getRandColor(160, 200));



 63:   for (int i = 0; i < 155; i++) {



 64:    int x=random.nextInt(width);



 65:    int y=random.nextInt(height);



 66:    int x1=random.nextInt(12);



 67:    int y1=random.nextInt(12);



 68:    g.drawLine(x, y, x+x1, y+y1);



 69:   }



 70:   //取随机产生的认证码（6位数）



 71:   String sRand="";



 72:   for (int i = 0; i < 6; i++) {



 73:    String rand=String.valueOf(random.nextInt(10));



 74:    sRand+=rand;



 75:    //将认证码显示到图像中



 76:    g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));



 77:    //



 78:    g.drawString(rand, 13*i+6, 16);



 79:   }



 80:    //赋值验证码



 81:    this.str=sRand;



 82:    //图像生效



 83:    g.dispose();



 84:    ByteArrayInputStream input=null;



 85:    ByteArrayOutputStream output=new ByteArrayOutputStream();



 86:    try {



 87:     ImageOutputStream imageOut=ImageIO.createImageOutputStream(output);



 88:     ImageIO.write(image, "JPEG", imageOut);



 89:     imageOut.close();



 90:     input=new ByteArrayInputStream(output.toByteArray());



 91:    } catch (IOException e) {



 92:     System.out.println("验证码图片产生出现错误："+e.toString());



 93:     e.printStackTrace();



 94:    }



 95:    this.image=input;



 96:  }



 97:



 98:  /*



 99:   * 给定范围获得随机颜色



100:   */



101:  private Color getRandColor(int fc,int bc) {



102:   Random random = new Random();



103:   if(fc>255){



104:    fc=255;



105:   }



106:   if(bc>255){



107:    bc=255;



108:   }



109:   int r=fc+random.nextInt(bc-fc);



110:   int g=fc+random.nextInt(bc-fc);



111:   int b=fc+random.nextInt(bc-fc);



112:   return new Color(r, g, b);



113:  }



114: }


二.创建RandomAction
获取图像流，并放到sessio中
  1: package com.action;



  2:



  3: import java.io.ByteArrayInputStream;



  4:



  5: import com.opensymphony.xwork2.ActionContext;



  6: import com.opensymphony.xwork2.ActionSupport;



  7: import com.util.RandomNumUtil;



  8:



  9: public class RandomAction extends ActionSupport{



 10:  private ByteArrayInputStream inputStream;



 11:



 12:  public ByteArrayInputStream getInputStream() {



 13:   return inputStream;



 14:  }



 15:



 16:  public void setInputStream(ByteArrayInputStream inputStream) {



 17:   this.inputStream = inputStream;



 18:  }



 19:



 20:  public String execute() throws Exception{



 21:



 22:   RandomNumUtil rand=RandomNumUtil.Instance();



 23:   this.setInputStream(rand.getImage());



 24:   ActionContext.getContext().getSession().put("random", rand.getStr());// 取得随机字符串放入HttpSession



 25:



 26:   return "success";



 27:  }



 28: }



 29: 


三.配置Struts.xml
  1: <package name="random" extends="struts-default">


  2: 		<!-- Random验证码 -->


  3: 		<action name="rand" class="com.action.RandomAction">


  4: 			<result type="stream"> <!-- 以流类型返回结果 -->


  5: 				<param name="contentType">image/jpeg</param>


  6: 				<param name="inputName">inputStream</param>


  7: 			</result>


  8: 		</action>


  9: 	</package>


四.在登录页面添加
  1: <s:textfield label="验证码"  name="rand" size="6" />



  2:       <image src="rand.action"



  3:         onclick="changeValidateCode(this)" title="点击图片刷新验证码" />




五.在loginAction中添加验证码验证


  1: String random = (String) ActionContext.getContext().getSession().get("random");



  2:   if (random.equals(rand)) {



  3:



  4:   } else {



  5:



  6:   }


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