struts2 验证码的生成

最新推荐文章于 2021-03-13 20:21:44 发布

原创最新推荐文章于 2021-03-13 20:21:44 发布 · 2.1k 阅读

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#struts #string #random #html #encoding #input

本文介绍了一个基于Struts2框架的简单用户登录示例，包括验证码生成与验证过程。涉及web.xml、struts.xml配置及Java代码实现。

随着struts2框架的日益成熟，struts2的使用群体日益庞大，struts2以其使用方便，容易上手而得到广大软件开发人员的推崇。最为一个struts2的初学者，我把自己做的一个简单的例子的经过和代码写出来。我的例子就是一个简单的用户登陆，同时还包含了验证码的生成。我的环境是jdk1.5+tomcat 5.5

1.首先是我是用到的jar包：

2.下面是我的代码实现：

（1） web.xml文件的代码：

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>Struts2Test</display-name> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> </web-app>

（2）index.html的代码：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <META HTTP-EQUIV="Refresh" CONTENT="0;URL=Start.action"> </head> <body> <h3>One moment please.</h3> </body> </html>

（3） struts.xml的源代码：

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="default" namespace="/" extends="struts-default"> <action name="Start"> <result>/pages/Login.jsp</result> </action> <action name="Login" class="co.nttdatatj.liusk.LoginAction"> <result name="SUCCESS">/pages/Display.jsp</result> </action> <action name="generateValidateCode" class="co.nttdatatj.liusk.ValidateCodeAction"> <result type="stream"> <param name="contentType">image/jpeg</param> <param name="inputName">inputStream</param> </result> </action> </package> </struts>

（4）Login.jsp的源代码：

<%@ page language="java" contentType="text/html; charset=windows-31j" pageEncoding="windows-31j"%> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=windows-31j"> <title>Insert title here</title> <mce:script type="text/javascript"></mce:script> </head> <body> <s:form action="Login" method="post"> <table> <tr> <td><s:textfield name="userName" label="用户名："></s:textfield></td> </tr> <tr> <td><s:password name="password" label="密码："></s:password></td> </tr> <tr> <td>验证码：<input name="validateCode"><img onclick="reloadValidate(this);" src="generateValidateCode.action?<%= Math.random() %>>"></td> </tr> <s:submit name="submit"/> </table> </s:form> </body> </html>

（5）Display.jsp的代码：

（6）LoginAction.java的源代码：

import org.apache.struts2.ServletActionContext; /** * @author liusk * */ public class LoginAction { private String userName; private String password; private String message; /** * @return message */ public String getMessage() { return message; } /** * @param message 設定する message */ public void setMessage(String message) { this.message = message; } /** * @return password */ public String getPassword() { return password; } /** * @return userName */ public String getUserName() { return userName; } /** * @param password 設定する password */ public void setPassword(String password) { this.password = password; } /** * @param userName 設定する userName */ public void setUserName(String userName) { this.userName = userName; } public String execute() { /*if ("liusk".equals(this.getUserName())) { message = "Login success!"; } else { message = "Invalid userName!"; } */ String inputValidateCode = ServletActionContext.getRequest().getParameter("validateCode"); String serverValidateCode = ServletActionContext.getRequest().getSession().getAttribute("ValidateCode").toString(); if (!serverValidateCode.equals(inputValidateCode)) { message = "Validate Code error!"; } return "SUCCESS"; } }

（7）验证码生成ValidateCodeAction.java的代码：

import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.util.Random; import javax.imageio.ImageIO; import org.apache.struts2.ServletActionContext; /** * @author liusk * */ public class ValidateCodeAction { private ByteArrayInputStream inputStream; /** * @return inputStream */ public ByteArrayInputStream getInputStream() { return inputStream; } /** * @param inputStream 設定する inputStream */ public void setInputStream(ByteArrayInputStream inputStream) { this.inputStream = inputStream; } public String execute() { try { this.setInputStream(generateImage()); } catch (IOException e) { e.printStackTrace(); } return "success"; } private ByteArrayInputStream generateImage() throws IOException{ BufferedImage image = new BufferedImage(100,20,BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); g.setColor(Color.WHITE); g.fillRect(0, 0, 100, 20); drawbg(g); drawValidateCode(g); ByteArrayInputStream input = null; ByteArrayOutputStream bos = new ByteArrayOutputStream(); ImageIO.write(image,"JPEG",bos); byte [] buf = bos.toByteArray(); input = new ByteArrayInputStream(buf); return input; } /** * backGround Draw */ private void drawbg(Graphics g) { Random rand = new Random(); int randx; int randy; for (int i = 0; i < rand.nextInt(100) + 500; i++) { g.setColor(new Color(rand.nextInt(255), rand.nextInt(255), rand .nextInt(255))); randx = rand.nextInt(100); randy = rand.nextInt(20); g.drawLine(randx, randy, randx, randy); } } /** * code draw */ private void drawValidateCode(Graphics g) { String code = generateCode(); Random rand = new Random(); int x = 0; Font font = new Font("Times New Roman", Font.PLAIN, 18); g.setFont(font); for (int i = 0; i < code.length(); i++) { int y = 20 - rand.nextInt(4); g.setColor(new Color(rand.nextInt(150), rand.nextInt(150), rand .nextInt(150))); g.drawString(code.substring(i, i + 1), x, y); x += 20; } } /** * code generate */ private String generateCode() { Random rand = new Random(); StringBuffer sbr = new StringBuffer( "ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789"); int codeLen = 5; StringBuffer codeSbr = new StringBuffer(); for (int i = 0; i < codeLen; i++) { int select = rand.nextInt(sbr.length()); codeSbr.append(sbr.charAt(select)); sbr.deleteCharAt(select); } ServletActionContext.getRequest().getSession().setAttribute("ValidateCode",codeSbr.toString()); return codeSbr.toString(); } }

通过以上的步骤和代码一个简单的struts2登陆的小测试程序就完成了。