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！

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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:

　　　　　　
                
                    image/jpeg
                    inputStream
                
　　　　　　  
            
            
                /success.jsp
                /login.jsp
            

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+"/";
%>


  
    
    
    
    
    
    
        
    
    
    
    
  
  
  

    
带有验证码的登陆界面
    
    
    
        用户名:

        密码    :

        验证码:
　　　　　
　　　　　
        

        
        
        
    
    

  

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