java编写简单漂亮的验证码

た入场券 2022-06-09 01:15 204阅读 0赞

代码如下

package com.bdqn.common;
 
 import java.awt.Color;
 import java.awt.Font;
 import java.awt.Graphics2D;
 import java.awt.image.BufferedImage;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.HashSet;
 import java.util.Random;
 import java.util.Set;
 
 import javax.imageio.ImageIO;
 
 import org.apache.struts2.ServletActionContext;
 
 /** * 生成验证码 * Title:RandomCodeGenerator * Description: * Company: * @author 123456 * yangyang */
 
 public class RandomCodeGenerator { 
 private static final char[] CHARS = "abcdefghijkmnpqrstovwxyz0123456789".toCharArray();
 private int length;
 private int fontSize = 14;
 private String randomCode = null;
 
 public RandomCodeGenerator(int length) {
 this.length = length;
 }
 
 public RandomCodeGenerator() {
 this(4);
 }
 
 public String getRandomCode() {
 if (randomCode == null) {
 // 生成验证码
 this.randomCode = initRandomCode();
 }
 return randomCode;
 }
 
 // 初始化验证码
 private String initRandomCode() {
 Set<Character> chars = new HashSet<>();
 Random r = new Random();
 while(chars.size() != length) {
 chars.add(CHARS[r.nextInt(CHARS.length)]);
 }
 
 char[] cs = new char[chars.size()];
 int index = 0;
 for (char c : chars) {
 cs[index++] = c;
 }
 return new String(cs).toUpperCase();
 }
 
 public BufferedImage generator(OutputStream output) throws IOException {
 int width = length * (fontSize + 2) + 10;
 int height = fontSize + 10;
 //创建一个缓存图片对象
 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
 //得到画笔对象
 Graphics2D g = (Graphics2D)image.getGraphics();
 //设置前景色
 g.setColor(Color.PINK);
 //使用前景色填充距形
 g.fillRect(0, 0, width, height);
 Random r = new Random();
 //绘制干扰线
 for(int i = 0; i < 3; i++){
 //生成随机颜色
 Color c = new Color(r.nextInt(256), r.nextInt(256), r.nextInt(256));
 g.setColor(c);
 //画线
 g.drawLine(r.nextInt(width / 2), r.nextInt(height), r.nextInt(width / 2) + width / 2, r.nextInt(height));
 }
 
 g.setColor(Color.WHITE);
 Font font = new Font("Cooper Std", Font.PLAIN, fontSize);
 //设置字体
 g.setFont(font);
 if(randomCode == null)
 this.randomCode = getRandomCode();
 for(int i = 0; i < randomCode.length(); i++){
 //画字符
 g.drawString(randomCode.substring(i, i+1), 8 + fontSize * i, height / 2 + fontSize / 2);
 }
 //完成，并将验证码放入session中
 //此处是将验证码存入session中进行验证码验证 //ServletActionContext.getRequest().getSession().setAttribute("checkCode", randomCode);
 image.flush();
 //输出
 ImageIO.write(image, "PNG", output);
 return image;
 
 }
 
 public int getFontSize() {
 return fontSize;
 }
 
 public void setFontSize(int fontSize) {
 this.fontSize = fontSize;
 }
 
 
 public static void main(String[] args) {
 RandomCodeGenerator rcg = new RandomCodeGenerator(6);
 System.out.println(rcg.getRandomCode());
 try {
 rcg.generator(new FileOutputStream("F:/a.png"));
 } catch (FileNotFoundException e) {
 e.printStackTrace();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }

效果图如下：  
![这里写图片描述][SouthEast]

[SouthEast]: /images/20220609/d12f2699e7ed40cca5329c69fffbb36d.png