Struts2实现生成动态验证码并验证实例代码

朱雀 2021-11-09 03:46 294阅读 0赞

这篇文章主要介绍了Struts2实现生成动态验证码并验证实例代码的相关资料,非常不错具有参考借鉴价值,需要的朋友可以参考下

###### 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：

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://www.w3.org/TR/html4/loose.dtd"> 
    <html> 
    <head> 
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
    <script type="text/javascript">  </script> 
    <title>测试页面</title> 
    </head> 
    <body> 
    <form action="testLogin" method="post"> 
    Username<input type="text" name="name"><br> 
    Password<input type="text" name="password"><br> 
    验证码：<input type="text" name="chknumber" id="chknumber" maxlength="4" class="chknumber_input"> 
    <img title="看不清楚请点击这里" width="50" height="20" src="<%=basePath%>randomCode.action" id="safecode" onclick="reloadcode(this,'<%=basePath%>')" /><br> 
    <input type="submit" value="Loginin"> 
    </form> 
    </body> 
    </html>

4、验证

（1）在Action中添加一个验证方法

public String testLogin() 
    {  
    	if(session.get("randomCode").equals(chknumber)) {  
    		return SUCCESS; 
    	} 
    	else{  
    		return ERROR; 
    	} 
    }

（２）在struts.xml中进行注册

<action name="testLogin" class="com.zhuguang.action.TestAction" method="testLogin">
    <result name="success">success.jsp</result>
    <result name="error">error.jsp</result>
    </action>

转载请标明出处：[Struts2实现生成动态验证码并验证实例代码\_java\_脚本之家][Struts2_java]

[Struts2_java]: https://www.jb51.net/article/85711.htm