java web中圖片驗證碼功效的簡略完成辦法

java web中圖片驗證碼功效的簡略完成辦法。本站提示廣大學習愛好者：（java web中圖片驗證碼功效的簡略完成辦法）文章只能為提供參考，不一定能成為您想要的結果。以下是java web中圖片驗證碼功效的簡略完成辦法正文

用戶在注冊網站信息的時刻根本上都要數據驗證碼驗證。那末圖片驗證碼功效該若何完成呢？

年夜概步調是：

1.在內存中創立緩存圖片

2.設置配景色

3.畫邊框

4.寫字母

5.繪制攪擾信息

6.圖片輸入

空話不多說，直接上代碼

package com.lsgjzhuwei.servlet.response;

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;

/**
 * Servlet implementation class VerificationCode
 */
@WebServlet(asyncSupported = true, urlPatterns = { "/VerificationCode" })
public class VerificationCode extends HttpServlet {
	private static final long serialVersionUID = 1L;
    
  /**
   * @see HttpServlet#HttpServlet()
   */
  public VerificationCode() {
    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
		
		int width = 120;
		int height = 30;
		
		//創立一張內存中的緩存圖片
		BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		
		///配景色
		//經由過程graphics繪制圖象
		Graphics graphics = bufferedImage.getGraphics();
		//設置色彩
		graphics.setColor(Color.yellow);
		//填充
		graphics.fillRect(0, 0, width, height);
		
		///畫邊框
		graphics.setColor(Color.blue);
		graphics.drawRect(0, 0, width-1, height-1);
		
		//寫字母
		String content = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcedfghijklmnopqrstuvwxyz1234567890";
		Random random = new Random();
		//設置字體色彩
		graphics.setColor(Color.red);
		//設置字體及年夜小
		graphics.setFont(new Font("宋體", Font.BOLD, 20));
		int x=20;
		int y=20;
		for(int i = 0; i < 4; i++)
		{
			int index = random.nextInt(content.length());
			char letter = content.charAt(index);
			graphics.drawString(letter+" ", x, y);
			x = x+20;
		}
		
		//繪制攪擾線
		int x1;
		int x2;
		int y1;
		int y2;
		graphics.setColor(Color.LIGHT_GRAY);
		for(int i = 0;i <50;i++)
		{
			x1=random.nextInt(width);
			x2=random.nextInt(width);
			y1=random.nextInt(height);
			y2=random.nextInt(height);
			graphics.drawLine(x1, y1, x2, y2);
		}
		
		//將圖片輸入到閱讀器
		//將內存的圖片經由過程閱讀器輸入流輸入成jpg圖片
		ImageIO.write(bufferedImage, "jpg", response.getOutputStream());
		
		
	}

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

}

以上這篇java web中圖片驗證碼功效的簡略完成辦法就是小編分享給年夜家的全體內容了，願望能給年夜家一個參考，也願望年夜家多多支撐。