Struts2实现生成动态验证码并验证实例代码

时间:2021-05-20

一、基本流程:

产生一个验证码页面(很小)→嵌入到表单中→点击可以刷新页面→表单提交时验证。

二、方法:

1、定义TestAction,实现画图方法

package com.zhuguang.action; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.util.Map; import javax.servlet.http.HttpServletResponse; import org.apache.struts2.interceptor.ServletResponseAware; import org.apache.struts2.interceptor.SessionAware; import com.opensymphony.xwork2.ActionSupport; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class TestAction extends ActionSupport implements SessionAware,ServletResponseAware { private Map<String, Object> session; private HttpServletResponse response; private static final long serialVersionUID = 1L; private String chknumber; @Override public String execute() throws Exception { response.setHeader("Cache-Control", "no-cache"); int width=50; //图片宽度 int height=20; //图片高度 BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics graphics=image.createGraphics(); graphics.setColor(this.getColor()); //背景颜色 graphics.fillRect(0, 0, width, height); graphics.setFont(new Font("Arial",Font.BOLD,18)); graphics.setColor(this.getColor()); //字的颜色 String number=String.valueOf(System.currentTimeMillis()%9000+1000); //生成四位随机数 session.put("randomCode", number); //写入session中 graphics.drawString(number, (int)(width*0.1), (int)(height*0.8)); graphics.dispose(); JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(response.getOutputStream()); encoder.encode(image); response.getOutputStream().flush(); //刷新到页面生成图片 response.getOutputStream().close(); //关闭writer return null; } private Color getColor(){ int red=(int)(Math.random()*1000%256); int green=(int)(Math.random()*1000%256); int blue=(int)(Math.random()*1000%256); return new Color(red,green,blue); } public String getChknumber() { return chknumber; } public void setChknumber(String chknumber) { this.chknumber = chknumber; } @Override public void setSession(Map<String, Object> session) { // TODO Auto-generated method stub this.session = session; } @Override public void setServletResponse(HttpServletResponse response) { // TODO Auto-generated method stub this.response = response; } }

注意用到session和response

2、在struts.xml文件中注册:

<action name="randomCode" class="com.zhuguang.action.TestAction"> </action>

其中不返回任何信息,这样就不会跳转页面

3、jsp页面编写

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@taglib uri="/struts-tags" prefix="s" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://.zhuguang.action.TestAction" method="testLogin"><result name="success">success.jsp</result><result name="error">error.jsp</result></action>

以上所述是小编给大家介绍的Struts2实现生成动态验证码并验证实例代码,希望对大家有所帮助!

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