java实现自定义数字验证码以及使用方法
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CodeServlet.java自定义画出验证码
package com.lxs.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;
public class CodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String codes="abcdefghijklmnopqrstuvwxyzABCDEFJHIJKLMNOPQRSTUVWXYZ0123456789";
BufferedImage img=new BufferedImage(80,30,BufferedImage.TYPE_3BYTE_BGR);
Graphics g=img.getGraphics();
//填充图片
g.setColor(new Color(255,255,255));
g.fillRect(0, 0, 80, 30);
//画入五个随机数
Random rm=new Random();
StringBuffer sb=new StringBuffer();
for(int i=0;i<5;i++){
int index=rm.nextInt(codes.length());
char code=codes.charAt(index);
g.setColor(new Color(rm.nextInt(256),rm.nextInt(256),rm.nextInt(256)));
g.setFont(new Font("宋体", Font.BOLD, 25));
g.drawString(code+"", 2+15*i, 22);
sb.append(code);
}
//画干扰线
for(int i=0;i<10;i++){
g.setColor(new Color(rm.nextInt(256),rm.nextInt(256),rm.nextInt(256)));
g.drawLine(rm.nextInt(100), rm.nextInt(50), rm.nextInt(100), rm.nextInt(50));
}
//将验证码图片回写给浏览器
response.setContentType("image/jpeg;charset=utf-8");
OutputStream out=response.getOutputStream();
ImageIO.write(img, "jpeg", out);
//将随机字符串保存在session中
request.getSession().setAttribute("code", sb.toString());
}
}
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;
public class CodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String codes="abcdefghijklmnopqrstuvwxyzABCDEFJHIJKLMNOPQRSTUVWXYZ0123456789";
BufferedImage img=new BufferedImage(80,30,BufferedImage.TYPE_3BYTE_BGR);
Graphics g=img.getGraphics();
//填充图片
g.setColor(new Color(255,255,255));
g.fillRect(0, 0, 80, 30);
//画入五个随机数
Random rm=new Random();
StringBuffer sb=new StringBuffer();
for(int i=0;i<5;i++){
int index=rm.nextInt(codes.length());
char code=codes.charAt(index);
g.setColor(new Color(rm.nextInt(256),rm.nextInt(256),rm.nextInt(256)));
g.setFont(new Font("宋体", Font.BOLD, 25));
g.drawString(code+"", 2+15*i, 22);
sb.append(code);
}
//画干扰线
for(int i=0;i<10;i++){
g.setColor(new Color(rm.nextInt(256),rm.nextInt(256),rm.nextInt(256)));
g.drawLine(rm.nextInt(100), rm.nextInt(50), rm.nextInt(100), rm.nextInt(50));
}
//将验证码图片回写给浏览器
response.setContentType("image/jpeg;charset=utf-8");
OutputStream out=response.getOutputStream();
ImageIO.write(img, "jpeg", out);
//将随机字符串保存在session中
request.getSession().setAttribute("code", sb.toString());
}
}
前台:image.jsp使用验证码
<%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" pageEncoding="utf-8"%>
<%!
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);
}
%>
<%
out.clear(); /*这句针对resin服务器,如果是tomacat可以不要这句*/
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
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",Font.PLAIN,18));
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 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);
}
// 将认证码存入SESSION
session.setAttribute("sRand",sRand);
g.dispose();
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
<%!
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);
}
%>
<%
out.clear(); /*这句针对resin服务器,如果是tomacat可以不要这句*/
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
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",Font.PLAIN,18));
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 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);
}
// 将认证码存入SESSION
session.setAttribute("sRand",sRand);
g.dispose();
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
使用方法的总结:
第一种:image.jsp
<script type="text/javascript">
function loadImage(){
document.getElementById("randImage").src = "${pageContext.request.contextPath}/image.jsp?"+Math.random(); //Math.random()方法非常重要,它使每次的请求都不同以便重新发送。如果每次的请求都一样,那么不会重新生成页面
}
</script>
<img onClick="javascript:loadImage();" title="换一张试试" id="randImage"
src="${pageContext.request.contextPath}/image.jsp" border="1" >
第二种:servlet方式
<servlet-name>CodeServlet</servlet-name>
<servlet-class>com.yinhe.web.servlet.CodeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CodeServlet</servlet-name>
<url-pattern>/checkCode</url-pattern>
</servlet-mapping>
<img src="checkCode" alt="" id="codeImg"
style="width: 80px; height: 30px; border: 1px solid black;" />
<a href="javascript:;" onclick="document.getElementById('codeImg').src = 'checkCode?'+(new Date()).getTime()">换一张</a>
<span id="codemsg" style="color: red; font-size: 20px;"></span>
<script type="text/javascript">
function loadImage(){
document.getElementById("randImage").src = "${pageContext.request.contextPath}/image.jsp?"+Math.random(); //Math.random()方法非常重要,它使每次的请求都不同以便重新发送。如果每次的请求都一样,那么不会重新生成页面
}
</script>
<img onClick="javascript:loadImage();" title="换一张试试" id="randImage"
src="${pageContext.request.contextPath}/image.jsp" border="1" >
第二种:servlet方式
<servlet-name>CodeServlet</servlet-name>
<servlet-class>com.yinhe.web.servlet.CodeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CodeServlet</servlet-name>
<url-pattern>/checkCode</url-pattern>
</servlet-mapping>
<img src="checkCode" alt="" id="codeImg"
style="width: 80px; height: 30px; border: 1px solid black;" />
<a href="javascript:;" onclick="document.getElementById('codeImg').src = 'checkCode?'+(new Date()).getTime()">换一张</a>
<span id="codemsg" style="color: red; font-size: 20px;"></span>
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