标签：pass mat success exe ati isp img array comm
之前想做一个随机验证码的功能，自己也搜索了一下别人写的代码，然后自己重新用struts2实现了一下，现在将我自己实现代码贴出来！大家有什么意见都可以指出来！
首先是生成随机验证码图片的action：
CreateImageAction:
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;
}
}
以上是生成随机验证码图片的action，将生成的随机数放到session里，然后页面提交到验证随机数的action:
LoginValidateAction:
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！");
}
}
}
下面是struts.xml配置部分代码:
<action name="createImageAction" class="com.xiaoluo.action.CreateImageAction">
<result name="success" type="stream">
<param name="contentType">image/jpeg</param>
<param name="inputName">inputStream</param>
</result>
</action>
<action name="loginValidateAction" class="com.xiaoluo.action.LoginValidateAction">
<result name="success">/success.jsp</result>
<result name="input">/login.jsp</result>
</action>
最后就是jsp部分的代码:
login.jsp:
<%@ 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>
标签：pass mat success exe ati isp img array comm
原文地址：http://www.cnblogs.com/Coolkaka/p/5987312.html
