java web中图片验证码功能实现
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用户在注册网站信息的时候基本上都要数据验证码验证。那么图片验证码功能该如何实现呢?
大概步骤是:
1.在内存中创建缓存图片
2.设置背景色
3.画边框
4.写字母
5.绘制干扰信息
6.图片输出
废话不多说,直接上代码
- 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;
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-
-
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- @WebServlet(asyncSupported = true, urlPatterns = { "/VerificationCode" })
- public class VerificationCode extends HttpServlet {
- private static final long serialVersionUID = 1L;
-
-
-
-
- public VerificationCode() {
- super();
-
- }
-
-
-
-
- protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-
-
- int width = 120;
- int height = 30;
-
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- BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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-
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- Graphics graphics = bufferedImage.getGraphics();
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- graphics.setColor(Color.yellow);
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- graphics.fillRect(0, 0, width, height);
-
-
- graphics.setColor(Color.blue);
- graphics.drawRect(0, 0, width-1, height-1);
-
-
- String content = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcedfghijklmnopqrstuvwxyz1234567890";
- Random random = new Random();
-
- graphics.setColor(Color.red);
-
- graphics.setFont(new Font("宋体", 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;
- }
-
-
- 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);
- }
-
-
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- ImageIO.write(bufferedImage, "jpg", response.getOutputStream());
-
-
- }
-
-
-
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- protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-
- }
-
- }
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