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struts2生成随机验证码图片

2014-11-20 22:19 337 查看

package com.xiaoluo.action;

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.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class CreateImageAction extends ActionSupport
{
private ByteArrayInputStream inputStream;

private static int WIDTH = 60;

private static int HEIGHT = 20;

public ByteArrayInputStream getInputStream()
{
return inputStream;
}

public void setInputStream(ByteArrayInputStream inputStream)
{
this.inputStream = inputStream;
}

private static String createRandom()
{
String str = "0123456789qwertyuiopasdfghjklzxcvbnm";

char[] rands = new char[4];

Random random = new Random();

for (int i = 0; i < 4; i++)
{
rands[i] = str.charAt(random.nextInt(36));
}

return new String(rands);
}

private void drawBackground(Graphics g)
{
// 画背景
g.setColor(new Color(0xDCDCDC));

g.fillRect(0, 0, WIDTH, HEIGHT);

// 随机产生 120 个干扰点

for (int i = 0; i < 120; i++)
{
int x = (int) (Math.random() * WIDTH);

int y = (int) (Math.random() * HEIGHT);

int red = (int) (Math.random() * 255);

int green = (int) (Math.random() * 255);

int blue = (int) (Math.random() * 255);

g.setColor(new Color(red, green, blue));

g.drawOval(x, y, 1, 0);
}
}

private void drawRands(Graphics g, String rands)
{
g.setColor(Color.BLACK);

g.setFont(new Font(null, Font.ITALIC | Font.BOLD, 18));

// 在不同的高度上输出验证码的每个字符

g.drawString("" + rands.charAt(0), 1, 17);

g.drawString("" + rands.charAt(1), 16, 15);

g.drawString("" + rands.charAt(2), 31, 18);

g.drawString("" + rands.charAt(3), 46, 16);

System.out.println(rands);

}

@Override
public String execute() throws Exception
{
HttpServletResponse response = ServletActionContext.getResponse();

// 设置浏览器不要缓存此图片
response.setHeader("Pragma", "no-cache");

response.setHeader("Cache-Control", "no-cache");

response.setDateHeader("Expires", 0);

String rands = createRandom();

BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
BufferedImage.TYPE_INT_RGB);

Graphics g = image.getGraphics();

// 产生图像
drawBackground(g);

drawRands(g, rands);

// 结束图像 的绘制 过程， 完成图像
g.dispose();

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

ImageIO.write(image, "jpeg", outputStream);

ByteArrayInputStream input = new ByteArrayInputStream(outputStream
.toByteArray());

this.setInputStream(input);

HttpSession session = ServletActionContext.getRequest().getSession();

session.setAttribute("checkCode", rands);

input.close();

outputStream.close();

return SUCCESS;
}
}

package com.xiaoluo.action;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginValidateAction extends ActionSupport
{
private String checkCode;

public String getCheckCode()
{
return checkCode;
}

public void setCheckCode(String checkCode)
{
this.checkCode = checkCode;
}

@Override
public String execute() throws Exception
{
return SUCCESS;
}

@Override
public void validate()
{
HttpSession session = ServletActionContext.getRequest().getSession();

String checkCode2 = (String)session.getAttribute("checkCode");

if(!checkCode.equals(checkCode2))
{
this.addActionError("输入的验证码不正确，请重新输入！");
}
}
}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'login.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>

<h3><font color="blue">带有验证码的登陆界面</font></h3>

<s:form action="loginValidateAction.action" theme="simple">

用户名:<s:textfield name="username"></s:textfield><br>
密码    :<s:password name="password"></s:password><br>
验证码:<s:textfield name="checkCode"></s:textfield>
　　　　　
　　　　　<!--若要点击图片刷新，重新得到一个验证码，要在后面加上个随机数，这样保证每次提交过去的都是不一样的path，防止因为缓存而使图片不刷新-->
<img src="createImageAction.action" onclick="this.src='createImageAction.action?'+ Math.random()" title="点击图片刷新验证码"/><br>
<s:actionerror cssStyle="color:red"/>

<s:submit value="提交"></s:submit>

</s:form>

</body>
</html>

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