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由于项目中用到了验证码，在网上找了一些示例，应用到了自己的项目中，还是只讲验证码忽略业务代码。

1， 在struts2-Spring-Ibatis框架中使用验证码

-页面部分

• struts配置文件部分

   
       
            
     image/jpeg        
     inputStream    
    
   

-Action部分

private ByteArrayInputStream inputStream;public String createImage() throws IOException{    HttpServletResponse response = this.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);       BufferedImage image = CreateImageUtil.drawImage();       ByteArrayOutputStream outputStream = new ByteArrayOutputStream();       ImageIO.write(image, "jpeg", outputStream);       ByteArrayInputStream input = new ByteArrayInputStream(outputStream               .toByteArray());       this.setInputStream(input);       input.close();       //强制刷新         outputStream.flush();         outputStream.close();    return SUCCESS;}

• 工具类

import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.util.Random;import org.apache.struts2.ServletActionContext;public class CreateImageUtil {
       private static int WIDTH = 90;    private static int HEIGHT = 28;    private static String createRandom(){        String str = "0123456789zxcvbnmasdfghjklqwertyuiop";        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 static 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 static 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);    }    public static BufferedImage drawImage(){        String rands = createRandom();        //将验证码放入Session        ServletActionContext.getRequest().getSession().setAttribute("checkCode", rands);           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();        return image;    }}

• 效果
  

2， 在spring mvc-Mybatis框架中使用验证码

• 页面部分

：

• Controller部分

@RequestMapping("createImage")public void createImage(HttpServletRequest request,         HttpServletResponse response,HttpSession session) throws IOException{       // 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);       BufferedImage image = CreateImageUtil.drawImage(session);       ImageIO.write(image, "jpeg",  response.getOutputStream());       response.getOutputStream().flush();}

• 工具类部分与上一个类似

import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.util.Random;import javax.servlet.http.HttpSession;public class CreateImageUtil {
       private static int WIDTH = 90;    private static int HEIGHT = 28;    private static String createRandom(){        String str = "0123456789asdfghjklzxcvbnmpoiuytrewq";        char[] rands = new char[5];        Random random = new Random();        for (int i = 0; i < 5; i++)        {            rands[i] = str.charAt(random.nextInt(36));        }        return new String(rands);    }    private static 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 static 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);        g.drawString("" + rands.charAt(4), 56, 20);        System.out.println(rands);    }    public static BufferedImage drawImage(HttpSession session){        String rands = createRandom();        //将验证码放入Session        session.setAttribute("authcode", rands);           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();        return image;    }}

• 效果
  

注：部分代码来自网络，另外这两种方式都是在项目中应用过的。不足之处请大家多多指教。