Struts2 图片验证码

来源：互联网发布：深圳软件开发公司编辑：程序博客网时间：2024/05/08 15:58

1、生成图片的类

package com.shenzhan.pro.util;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import java.io.*;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;

public class CreateValidateAction extends ActionSupport{
    private ByteArrayInputStream inputStream;
    public String execute() throws Exception{
//       在内存中创建图象
        int width=85, height=25;
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//       获取图形上下文
        Graphics g = image.getGraphics();
//      生成随机类
        Random random = new Random();
//       设定背景色
        g.setColor(getRandColor(200,250));
        g.fillRect(0, 0, width, height);
//      设定字体
        g.setFont(new Font("Times New Roman",Font.PLAIN,18));
//       随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
        g.setColor(getRandColor(160,200));
        for (int i=0;i<155;i++)
        {
         int x = random.nextInt(width);
         int y = random.nextInt(height);
                int xl = random.nextInt(12);
                int yl = random.nextInt(12);
         g.drawLine(x,y,x+xl,y+yl);
        }
//       取随机产生的认证码(6位数字)
        String sRand="";


        StringBuffer buffer = new StringBuffer("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
      StringBuffer sb = new StringBuffer();
      Random r = new Random();
      int range = buffer.length();
      for (int i = 0; i < 6; i ++)
      {
     char ranchar=buffer.charAt(r.nextInt(range));
          sb.append(ranchar);
       // 将认证码显示到图象中
             g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
//       调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
             g.drawString(String.valueOf(ranchar),13*i+6,16);
      }
      sRand=sb.toString();
//       将认证码存入SESSION
        ActionContext.getContext().getSession().put("Validatecode",sRand);
//       图象生效
        g.dispose();
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
        ImageIO.write(image, "JPEG", imageOut);
        imageOut.close();
        ByteArrayInputStream input = new ByteArrayInputStream(output.toByteArray());
        this.setInputStream(input);
        UploadFile.sayhello("图片己执行!随机码是 "+sRand, 3);
        return SUCCESS;
    }
    /*
     * 给定范围获得随机颜色
     */
    private Color getRandColor(int fc,int bc){
        Random random = new Random();
        if(fc>255) fc=255;
        if(bc>255) bc=255;
        int r=fc+random.nextInt(bc-fc);
        int g=fc+random.nextInt(bc-fc);
        int b=fc+random.nextInt(bc-fc);
        return new Color(r,g,b);
   }
    public void setInputStream(ByteArrayInputStream inputStream) {
        this.inputStream = inputStream;
    }
    public ByteArrayInputStream getInputStream() {
        return inputStream;
    }
}

2、struts.xml

<action name="createValidateAction" class="com.shenzhan.pro.util.CreateValidateAction">
            <result type="stream">
                <param name="contentType">image/jpeg</param>
                <param name="inputName">inputStream</param>
            </result>
        </action>

3、页面上的使用

J<HEAD>

<BODY>