web实现图形验证码功能

jopen 7年前

这里直接上工程文件源码:

web实现图形验证码功能

ValidateImage.java:

package jpeg;    import java.awt.Color;  import java.awt.Font;  import java.awt.Graphics;  import java.awt.image.BufferedImage;  import java.io.IOException;  import java.io.OutputStream;  import java.util.Random;    import javax.servlet.ServletException;  import javax.servlet.http.HttpServlet;  import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;    import com.sun.image.codec.jpeg.JPEGCodec;  import com.sun.image.codec.jpeg.JPEGEncodeParam;  import com.sun.image.codec.jpeg.JPEGImageEncoder;    public class ValidateImage extends HttpServlet {      protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{       response.setContentType("image/jpeg");       createImage(response.getOutputStream());       response.setHeader("Pragma","No-cache");       response.setHeader("Cache-Control","no-cache");       response.setDateHeader("Expires", 0);   }      private void createImage(OutputStream out)throws IOException {    int width=60, height=20;    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);    Graphics g = image.getGraphics();    Random random = new Random();    g.setColor(getRandColor(200,250));    g.fillRect(0, 0, width, height);    g.setFont(new Font("Times New Roman",1,15));    //g.setColor(new Color());    //g.drawRect(0,0,width-1,height-1);    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);    }    //String rand = request.getParameter("rand");    //rand = rand.substring(0,rand.indexOf("."));    String sRand="";    for (int i=0;i<4;i++){        String rand=String.valueOf(random.nextInt(10));        sRand+=rand;        g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));        g.drawString(rand,13*i+6,16);    }                //session.setAttribute("rand",sRand);    g.dispose();    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);    JPEGEncodeParam param  = encoder.getDefaultJPEGEncodeParam(image);    param.setQuality(1.0f, false);    encoder.setJPEGEncodeParam(param);    try{     encoder.encode(image);    }catch (IOException ioe){     ioe.printStackTrace();    }   }      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);          }      }


TestImage.jsp:

  <body>      <img src="validate"> <br>    </body>

web.xml:

<?xml version="1.0" encoding="UTF-8"?>  <web-app version="2.5"    xmlns="http://java.sun.com/xml/ns/javaee"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">    <servlet>      <description>This is the description of my J2EE component</description>      <display-name>This is the display name of my J2EE component</display-name>      <servlet-name>ValidateImage</servlet-name>      <servlet-class>jpeg.ValidateImage</servlet-class>    </servlet>      <servlet-mapping>      <servlet-name>ValidateImage</servlet-name>      <url-pattern>/validate</url-pattern>    </servlet-mapping>    <welcome-file-list>      <welcome-file>index.jsp</welcome-file>    </welcome-file-list>  </web-app>


 

地址栏:http://localhost:8080/JPEG/jsp/TestImage.jsp 结果:

web实现图形验证码功能

 来自:http://blog.csdn.net/itzyjr/article/details/8451994