我們訪問電商網站，登入賬號時。都需要驗證碼的輸入。那麼在java中，我們是如何實現驗證碼的呢？這裡，我用servelet做個demo。

程式碼清單：

package com.test;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import
 
 javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import
 
 javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class ValidateCodeServle
 */
@WebServlet("/ValidateCodeServle")
public class ValidateCodeServle extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public
 
 ValidateCodeServle() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doPost(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 響應頭資訊
        response.setHeader("Pragma", "No-Cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expries", 0);

        // 隨機數生成類
        Random random = new Random();

        // 定義驗證碼的位數
        int size = 5;

        // 定義變數儲存生成的驗證碼
        String vCode = "";
        char c;
        // 產生驗證碼
        for (int i = 0; i < size; i++) {
            // 產生一個26以內的隨機整數
            int number = random.nextInt(26);
            // 如果生成的是偶數，則隨機生成一個數字
            if (number % 2 == 0) {
                c = (char) ('0' + (char) ((int) (Math.random() * 10)));
                // 如果生成的是奇數，則隨機生成一個字母
            } else {
                c = (char) ((char) ((int) (Math.random() * 26)) + 'A');
            }
            vCode = vCode + c;
        }

        // 儲存生成的5位驗證碼
        request.getSession().setAttribute("vCode", vCode);

        // 驗證碼圖片的生成
        // 定義圖片的寬度和高度
        int width = (int) Math.ceil(size * 20);
        int height = 30;
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        // 獲取圖片的上下文
        Graphics gr = image.getGraphics();
        // 設定圖片背景顏色
        gr.setColor(Color.WHITE);
        gr.fillRect(0, 0, width, height);
        // 設定圖片邊框
        gr.setColor(Color.GRAY);
        gr.drawRect(0, 0, width - 1, height - 1);
        // 畫十條幹擾線
        for (int i = 0; i < 5; i++) {
            int x1 = random.nextInt(width);
            int y1 = random.nextInt(height);
            int x2 = random.nextInt(width);
            int y2 = random.nextInt(height);
            gr.setColor(randomColor());
            gr.drawLine(x1, y1, x2, y2);
        }
        // 設定字型，畫驗證碼
        gr.setColor(randomColor());
        gr.setFont(randomFont());
        gr.drawString(vCode, 10, 22);
        // 影象生效
        gr.dispose();
        // 輸出到頁面
        ImageIO.write(image, "JPEG", response.getOutputStream());

    }

    // 生成隨機的顏色
    private Color randomColor() {
        int red = r.nextInt(150);
        int green = r.nextInt(150);
        int blue = r.nextInt(150);
        return new Color(red, green, blue);
    }

    private String[] fontNames = { "宋體", "華文楷體", "黑體", "微軟雅黑", "楷體_GB2312" };
    private Random r = new Random();

    // 生成隨機的字型
    private Font randomFont() {
        int index = r.nextInt(fontNames.length);
        String fontName = fontNames[index];// 生成隨機的字型名稱
        int style = r.nextInt(4);
        int size = r.nextInt(3) + 24; // 生成隨機字號, 24 ~ 28
        return new Font(fontName, style, size);
    }


}

測試：