java生成验证码并可刷新

2022-10-21 20:05:30

手心创建一个简单的页面来显示所创建的验证码

<body>

  		<form action="loginName.mvc" method="post">

	  		用户名:<input type="text" name="name" id="name"/><br/>

	  		密码:<input type="password" name="password"  id="password"/><br/>

	  		验证码1：<a href="javascript:changePicture1();" title='看不清楚，换个图片'><img id="checkcode1"  src=""><a href="javascript:changePicture1();" class="login-text03" title='看不清楚，换个图片'>看不清楚,换个图片</a><br/>

	  		验证码2：<a href="javascript:changePicture2();" title='看不清楚，换个图片'><img id="checkcode2"  src=""><a href="javascript:changePicture2();" class="login-text03" title='看不清楚，换个图片'>看不清楚,换个图片</a><br/>

	  		验证码3：<a href="javascript:changePicture3();" title='看不清楚，换个图片'><img id="checkcode3"  src=""><a href="javascript:changePicture3();" class="login-text03" title='看不清楚，换个图片'>看不清楚,换个图片</a>

	  		<span id="spantext"></span><br/>

	  		<!--  <input type="button" value="登录" onclick="loginPerson()"/>-->

	  		<input type="submit" value="登录"/>

  		</form>

  </body>

  <script language="javascript">

  	window.onload=function(){

  		changePicture1();

  		changePicture2();

  		changePicture3();

  	};

  	function changePicture1(){

  		$("#checkcode1").attr("src","servlet/CheckCode?code="+Math.random());

  	}

  	function changePicture2(){

  		/* var arry=["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q",

  		         "R","S","T","U","V","W","X","Y","Z","0","1","2","3","4","5","6","7","8","9"];

  		var len=arry.length;

  		var code="";

  		for(i=0;i<=4;i++){

  			var index=Math.floor(Math.random()*len);

  			code+=arry[index];

  		} */

  		//alert(code);

  		$("#checkcode2").attr("src","servlet/ImageServlet?code="+Math.random());

  	}

  	function changePicture3(){

  		$("#checkcode3").attr("src","servlet/graphicsImage?code="+Math.random());

  	}

  	function loginPerson(){

  		var name=document.getElementById("name").value;

  		var password=document.getElementById("password").value;

  		if(name==""||password==""){

  		    alert("账户名或密码不能为空");

  			$("#spantext").html("账户名或密码不能为空");

  		}else{

  			$.ajax({

  				type : "post",

  				url : "./loginName.mvc?name="+name+"&password="+password,

  				success : function(data){

  					alert(data);

  					var obj=eval("("+data+")");

  					var message=obj.code;

  					//var name=obj.name;

  					//var password=obj.password;

  					alert(message);

  					//alert(name);

  					//alert(password);

  				},

  				error : function(data){

  					$("#spantext").html("网络错误");

  				}

  			});

  		}

  	}

  </script>

　　在这里写有三个生成验证码的类，其实他们的本质是一样的，都是类似的

创建的第一个验证码

package com.chinasoft.ssm.servlet;

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.io.PrintWriter;

import java.util.Random;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class CheckCode extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        doPost(request,response);

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

            response.setContentType("image/jpeg");

            // 图片的内存映像

            BufferedImage image = new BufferedImage(60, 20,BufferedImage.TYPE_INT_BGR);

            // 获取画笔对象

            Graphics g = image.getGraphics();

            //随机变换图片的颜色

            Random r = new Random();

            g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));

            //开始绘制图片

            g.fillRect(0, 0, 60, 20);

            //将画笔颜色清零

            g.setColor(new Color(0,0,0));

            Font font = new Font("Verdana", Font.ITALIC|Font.BOLD, 16);

            g.setFont(font);

            String number = String.valueOf(r.nextInt(99999));

            HttpSession session = request.getSession();

            session.setAttribute("number", number);

            g.drawString(number, 5, 15);

            g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));

            //压缩jpeg格式转换为输出流的形式

            OutputStream os = response.getOutputStream();

           //把输出流对象中的图像信息编码

            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);

            //向创建对象时指定的输出流输出

            encoder.encode(image);

            os.flush();

            os.close();

    }

    /**

     * Initialization of the servlet. <br>

     *

     * @throws ServletException if an error occurs

     */

    public void init() throws ServletException {

        // Put your code here

    }

}

package com.chinasoft.ssm.servlet;

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.imageio.ImageIO;

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.JPEGImageEncoder;

public class ImageServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        doPost(request,response);

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        String ch1= (String) request.getParameter("code");

        System.out.println(ch1);

         response.setContentType("image/jpeg");

        // 图片的内存映像

        BufferedImage bi=new BufferedImage(68, 22,BufferedImage.TYPE_INT_RGB);

        //获得画笔对象

        Graphics g=bi.getGraphics();

        //图片的颜色选择

        Color c=new Color(200,150,255);

        g.setColor(c);

        //开始绘制图片

        g.fillRect(0, 0, 68, 22);

        char[] ch="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();

        Random r=new Random();

        int len=ch.length;

        int index;

        StringBuffer sb=new StringBuffer();

        for(int i=0;i<4;i++)

        {

            //获取一个随机数

            index=r.nextInt(len);

            //给字体设置颜色

            Font font = new Font("Verdana", Font.ITALIC|Font.BOLD, 16);

            g.setFont(font);

            g.setColor(new Color(r.nextInt(88),r.nextInt(188),r.nextInt(255)));

            //将所有选择的字体绘画出来

            g.drawString(ch[index]+"",(i*15)+3, 18);

            //将随机生成的验证码添加到可变字符sb中去

            sb.append(ch[index]);

        }

        //将生成的验证码对象保存到piccode对应的value中去

        //request.getSession().setAttribute("piccode", sb.toString());

        //使用给定的支持格式将图像BufferedImage的bi对象写入到响应输出流当中

        //ImageIO.write(bi, "JPG", response.getOutputStream());

        OutputStream os = response.getOutputStream();

        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);

        //向创建对象时指定的输出流输出

        encoder.encode(bi);

        os.flush();

        os.close();

    }

}

创建的第二个验证码

package com.chinasoft.ssm.servlet;

import java.awt.AlphaComposite;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class graphicsImage extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        doPost(request,response);

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        char[] strs = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();

        BufferedImage bi = new BufferedImage(150,40,BufferedImage.TYPE_INT_RGB);

        Graphics2D g = (Graphics2D)bi.getGraphics();

        Random num=new Random();

        Color color ;

        int len = strs.length;

        g.setColor(Color.WHITE);

        g.fillRect(0,0,150,40);

        // 随机画干扰的蛋蛋

        for(int i=0;i<15;i++){

            color =new  Color(150,100, 250);

            g.setColor(color);

            // 画蛋蛋，有蛋的生活才精彩

            g.drawOval(num.nextInt(150), num.nextInt(40), 5+num.nextInt(10), 5+num.nextInt(10));

            color = null;

        }

        Font font = new Font("Verdana", Font.ITALIC|Font.BOLD, 28);

        g.setFont(font);

        /* 画字符串 */

        for(int i=0;i<6;i++)

        {

            int index=num.nextInt(len);

            // 指定透明度

            AlphaComposite ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.7f);

            g.setComposite(ac3);

            // 对每个字符都用随机颜色

            color = new Color(20 + num.nextInt(110), 20 + num.nextInt(110), 20 + num.nextInt(110));

            g.setColor(color);

            g.drawString(strs[index]+"",(i*15)+40, 40-4);

            color = null;

            ac3 = null;

        }

        ImageIO.write(bi, "png", response.getOutputStream());

    }

    public void init() throws ServletException {

        // Put your code here

    }

}

创建的第三个验证码

码农公寓

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