99 lines
2.7 KiB
Java
99 lines
2.7 KiB
Java
package com.wf.captcha;
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import java.awt.AlphaComposite;
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics2D;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.io.OutputStream;
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import javax.imageio.ImageIO;
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/**
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* <p>png格式验证码</p>
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*
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* @author: wuhongjun
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* @version:1.0
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*/
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public class SpecCaptcha extends Captcha
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{
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public SpecCaptcha()
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{
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}
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public SpecCaptcha(int width, int height)
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{
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this.width = width;
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this.height = height;
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}
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public SpecCaptcha(int width, int height, int len){
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this(width,height);
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this.len = len;
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}
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public SpecCaptcha(int width, int height, int len, Font font){
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this(width,height,len);
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this.font = font;
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}
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/**
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* 生成验证码
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* @throws java.io.IOException IO异常
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*/
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@Override
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public void out(OutputStream out){
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graphicsImage(alphas(), out);
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}
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/**
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* 画随机码图
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* @param strs 文本
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* @param out 输出流
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*/
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private boolean graphicsImage(char[] strs, OutputStream out){
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boolean ok = false;
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try
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{
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BufferedImage bi = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
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Graphics2D g = (Graphics2D)bi.getGraphics();
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AlphaComposite ac3;
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Color color ;
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int len = strs.length;
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g.setColor(Color.WHITE);
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g.fillRect(0,0,width,height);
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// 随机画干扰的蛋蛋
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for(int i=0;i<15;i++){
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color = color(150, 250);
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g.setColor(color);
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g.drawOval(num(width), num(height), 5+num(10), 5+num(10));// 画蛋蛋，有蛋的生活才精彩
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color = null;
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}
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g.setFont(font);
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int h = height - ((height - font.getSize()) >>1),
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w = width/len,
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size = w-font.getSize()+1;
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/* 画字符串 */
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for(int i=0;i<len;i++)
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{
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ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.7f);// 指定透明度
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g.setComposite(ac3);
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color = new Color(20 + num(110), 20 + num(110), 20 + num(110));// 对每个字符都用随机颜色
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g.setColor(color);
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g.drawString(strs[i]+"",(width-(len-i)*w)+size, h-4);
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color = null;
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ac3 = null;
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}
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ImageIO.write(bi, "png", out);
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out.flush();
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ok = true;
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}catch (IOException e){
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ok = false;
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}finally
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{
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try {
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out.close();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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return ok;
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}
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} |