Struts2完成生成靜態驗證碼並驗證明例代碼。本站提示廣大學習愛好者：（Struts2完成生成靜態驗證碼並驗證明例代碼）文章只能為提供參考，不一定能成為您想要的結果。以下是Struts2完成生成靜態驗證碼並驗證明例代碼正文
1、根本流程：
發生一個驗證碼頁面（很小）→嵌入到表單中→點擊可以刷新頁面→表單提交時驗證。
2、辦法：
1、界說TestAction，完成繪圖辦法
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; //圖片寬度
int height=20; //圖片高度
BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics graphics=image.createGraphics();
graphics.setColor(this.getColor()); //配景色彩
graphics.fillRect(0, 0, width, height);
graphics.setFont(new Font("Arial",Font.BOLD,18));
graphics.setColor(this.getColor()); //字的色彩
String number=String.valueOf(System.currentTimeMillis()%9000+1000); //生成四位隨機數
session.put("randomCode", number); //寫入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(); //刷新到頁面熟成圖片
response.getOutputStream().close(); //封閉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;
}
}
留意用到session和response
2、在struts.xml文件中注冊：
<action name="randomCode" class="com.zhuguang.action.TestAction"> </action>
個中不前往任何信息，如許就不會跳轉頁面
3、jsp頁面編寫
<%@ 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">
<!--
function reloadcode(obj,base){
var rand=new Date().getTime(); //這裡用以後時光作為參數加到url中，是為了使URL產生變更，如許驗證碼才會靜態加載，
//只是一個攪擾感化，無確切意義，但卻又異常奇妙，呵呵
obj.src=base+"randomCode.action?abc="+rand; //其實辦事器端是沒有abc的字段的。
}
//-->
</script>
<title>測試頁面</title>
</head>
<body>
<form action="testLogin" method="post">
Username<input type="text" name="name"><br>
Password<input type="text" name="password"><br>
驗證碼：<input type="text" name="chknumber" id="chknumber" maxlength="4" class="chknumber_input">
<img title="看不清晰請點擊這裡" width="50" height="20" src="<%=basePath%>randomCode.action" id="safecode" onclick="reloadcode(this,'<%=basePath%>')" /><br>
<input type="submit" value="Loginin">
</form>
</body>
</html>
4、驗證
（1）在Action中添加一個驗證辦法
public String testLogin()
{
if(session.get("randomCode").equals(chknumber))
{
return SUCCESS;
}
else
{
return ERROR;
}
}
（２）在struts.xml中停止注冊
<action name="testLogin" class="com.zhuguang.action.TestAction" method="testLogin"> <result name="success">success.jsp</result> <result name="error">error.jsp</result> </action>
以上所述是小編給年夜家引見的Struts2完成生成靜態驗證碼並驗證明例代碼，願望對年夜家有所贊助！
