java生成验证码

ps:话不多少、上图，点击图片可以切换验证码

 

1、生成验证码类

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;

public class ValidateCode {
	 // 图片的宽度。  
    private int width = 160;  
    // 图片的高度。  
    private int height = 40;  
    // 验证码字符个数  
    private int codeCount = 5;  
    // 验证码干扰线数  
    private int lineCount = 150;  
    // 验证码  
    private String code = null;  
    // 验证码图片Buffer  
    private BufferedImage buffImg = null;  

    // 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了)  
    private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',  
            'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',  
            'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'};  

    /** 
     * 默认构造函数,设置默认参数 
     */  
    public ValidateCode() {  
        this.createCode();  
    }  

    /** 
     * @param width  图片宽 
     * @param height 图片高 
     */  
    public ValidateCode(int width, int height) {  
        this.width = width;  
        this.height = height;  
        this.createCode();  
    }  

    /** 
     * @param width     图片宽 
     * @param height    图片高 
     * @param codeCount 字符个数 
     * @param lineCount 干扰线条数 
     */  
    public ValidateCode(int width, int height, int codeCount, int lineCount) {  
        this.width = width;  
        this.height = height;  
        this.codeCount = codeCount;  
        this.lineCount = lineCount;  
        this.createCode();  
    }  

    public void createCode() {  
        int x = 0, fontHeight = 0, codeY = 0;  
        int red = 0, green = 0, blue = 0;  

        x = width / (codeCount + 2);//每个字符的宽度(左右各空出一个字符)  
        fontHeight = height - 2;//字体的高度  
        codeY = height - 4;  

        // 图像buffer  
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
        Graphics2D g = buffImg.createGraphics();  
        // 生成随机数  
        Random random = new Random();  
        // 将图像填充为白色  
        g.setColor(Color.WHITE);  
        g.fillRect(0, 0, width, height);  
        // 创建字体,可以修改为其它的  
        Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);  
//        Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight);  
        g.setFont(font);  

        for (int i = 0; i < lineCount; i++) {  
            // 设置随机开始和结束坐标  
            int xs = random.nextInt(width);//x坐标开始  
            int ys = random.nextInt(height);//y坐标开始  
            int xe = xs + random.nextInt(width / 8);//x坐标结束  
            int ye = ys + random.nextInt(height / 8);//y坐标结束  

            // 产生随机的颜色值，让输出的每个干扰线的颜色值都将不同。  
            red = random.nextInt(255);  
            green = random.nextInt(255);  
            blue = random.nextInt(255);  
            g.setColor(new Color(red, green, blue));  
            g.drawLine(xs, ys, xe, ye);  
        }  

        // randomCode记录随机产生的验证码  
        StringBuffer randomCode = new StringBuffer();  
        // 随机产生codeCount个字符的验证码。  
        for (int i = 0; i < codeCount; i++) {  
            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);  
            // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。  
            red = random.nextInt(255);  
            green = random.nextInt(255);  
            blue = random.nextInt(255);  
            g.setColor(new Color(red, green, blue));  
            g.drawString(strRand, (i + 1) * x, codeY);  
            // 将产生的四个随机数组合在一起。  
            randomCode.append(strRand);  
        }  
        // 将四位数字的验证码保存到Session中。  
        code = randomCode.toString();  
    }  

    public void write(String path) throws IOException {  
        OutputStream sos = new FileOutputStream(path);  
        this.write(sos);  
    }  

    public void write(OutputStream sos) throws IOException {  
        ImageIO.write(buffImg, "png", sos);  
        sos.close();  
    }  

    public BufferedImage getBuffImg() {  
        return buffImg;  
    }  

    public String getCode() {  
        return code;  
    }  

    /** 
     * 测试函数,默认生成到d盘 
     * @param args 
     */  
    public static void main(String[] args) {  
        ValidateCode vCode = new ValidateCode(160,40,5,150);  
        try {  
            String path="D:/"+new Date().getTime()+".png";  
            System.out.println(vCode.getCode()+" >"+path);  
            vCode.write(path);  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
}

 

2、验证码控制器---管理生成的验证码

public class RandomAction extends BaseAction{

	private static final long serialVersionUID = 1L;
	     private ByteArrayInputStream inputStream;
	
	     // 生成验证码方法
	    public String execute() throws Exception {
	    	ValidateCode vCode  = new ValidateCode();
	    	getSession().setAttribute("code", vCode.getCode());//把验证码放入HttpSession中
	        vCode.write(getResponse().getOutputStream());// 取得带有随机字符串的图片
	         return "random";
	     }
	
	    public void setInputStream(ByteArrayInputStream inputStream) {
	        this.inputStream = inputStream;
	     }
	 
	     public ByteArrayInputStream getInputStream() {
         return inputStream;
	     }
	
}

3、struts.xml配置验证码控制器

  <!-- Random验证码 -->
        <action name="random" class="com.art.plat.web.action.RandomAction">
            <result type="stream" name="random">
                 <param name="contentType">image/jpeg</param>
                 <param name="inputName">inputStream</param>
             </result>
         </action>

 index.jsp页面

<div class="frm_control_group">
<label>验证码</label>
<div class="frm_control" >
     <input type="text" id="radomCode" name="radomCode" class="random"  style="width: 
              150px;"  maxlength="5">
<img id="randomImg"onclick="document.getElementById('randomImg').src='/admin/random.action? 
    time='+Math.random();" title="点击图片刷新验证码" src="/admin/random.action" 
                            class="code_img"/>
  <p class="frm_false" id="random_tip" style="display:none;">
   <i class="fa fa-exclamation-triangle" aria-hidden="true"></i><span></span>
  </p>
</div>
 </div>