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004——struts生成图片验证码

2016-07-13 19:21 495 查看

login.jsp

<span style="font-size:18px;"><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<script type="text/javascript">
function reloadImage() {
document.getElementById('btn').disabled = true;
document.getElementById('identify').src = 'validatecode.do?ts=' + new Date().getTime();
}
</script>
</head>

<body>
<div align="center">
<table>
<tr>
<td>
<form method="post" action="LoginServlet">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" name="username"></td>
</tr>
<tr>
<td>密　码：</td>
<td><input type="password" name="password"></td>
</tr>
<tr>
<td><img src="validatecode.do" id="identify" onload="btn.disabled=false;"/></td>
<td><input type="text" name="identifyCode"><input type="button" value="换张图片" id="btn" onclick="reloadImage()"></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="登录"></td>
</tr>
</table>
</form>
</td>
</tr>
</table>
</div>
</body>
</html> </span>Action

<span style="font-size:18px;">package com.java.struts.action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.commons.lang.RandomStringUtils;

public class ValidatecodeAction extends Action {

/**
* Method execute
*
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
try {
// 定义图片的宽和长
int width = 60;
int height = 20;
// 取得一个4位随机字母数字字符串
String s = RandomStringUtils.random(4, true, true);

// 保存入session,用于与用户的输入进行比较.
// 注意比较完之后清除session.
HttpSession session = request.getSession(true);
session.setAttribute("validateCode", s);

//向客户端响应一个图片文件
response.setContentType("images/jpeg");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);

ServletOutputStream out = response.getOutputStream();
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
// 设定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);

// 设定字体--类型，颜色，大小
Font mFont = new Font("Times New Roman", Font.PLAIN, 20);// 设置字体
g.setFont(mFont);

// 画边框
//g.setColor(Color.BLACK);
//g.drawRect(0, 0, width - 1, height - 1);

// 随机产生干扰线，使图象中的认证码不易被其它程序探测到
g.setColor(getRandColor(160, 200));
// 生成随机类
Random random = new Random();
for (int i = 0; i < 155; i++) {
int x2 = random.nextInt(width);
int y2 = random.nextInt(height);
int x3 = random.nextInt(12);
int y3 = random.nextInt(12);
g.drawLine(x2, y2, x2 + x3, y2 + y3);
}
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)));
g.drawString(rand, 13 * i + 6, 16);
}
// 将生成的认证码放入session中，已变action中做验证
session.setAttribute("rand", sRand);

// 图象生效
g.dispose();
// 输出图象到页面
ImageIO.write((BufferedImage) image, "JPEG", out);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

private Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色
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);
}
}
</span>

struts-config.xml

<span style="font-size:18px;"><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>
<form-beans />
<global-exceptions />
<global-forwards />
<action-mappings>
<action path="/validatecode"
type="com.java.struts.action.ValidatecodeAction">
</action>
</action-mappings>
<message-resources parameter="ApplicationResources" />
</struts-config></span>

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标签： struts 图片验证码

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