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()); //背景顏色 
graphics.fillRect(0, 0, width, height); 
graphics.setFont(new Font("Arial",Font.BOLD,18)); 
graphics.setColor(this.getColor()); //字的顏色 
String number=String.valueOf(System.currentTimeMillis()%9000+1000); //生成四位隨機數(shù) 
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(); //刷新到頁面生成圖片 
response.getOutputStream().close(); //關(guān)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; 
} 
}

注意用到session和response

2、在struts.xml文件中注冊：

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

其中不返回任何信息，這樣就不會跳轉(zhuǎn)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(); //這里用當(dāng)前時間作為參數(shù)加到url中，是為了使URL發(fā)生變化，這樣驗證碼才會動態(tài)加載， 
//只是一個干擾作用，無確實意義，但卻又非常巧妙，呵呵 
obj.src=base+"randomCode.action?abc="+rand; //其實服務(wù)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="看不清楚請點擊這里" width="50" height="20" src="<%=basePath%>randomCode.action" id="safecode" onclick="reloadcode(this,'<%=basePath%>')" /><br> 
<input type="submit" value="Loginin"> 
</form> 
</body> 
</html>

4、驗證

（1）在Action中添加一個驗證方法

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

（２）在struts.xml中進行注冊

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

以上所述是小編給大家介紹的Struts2實現(xiàn)生成動態(tài)驗證碼并驗證實例代碼，希望對大家有所幫助！

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