CodeUtil.java
/*
* Copyright 2018-2030 the original author or authors.
*
* Licensed under the company, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.company.com/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.sandy.ecp.framework.util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
/**
* validate code
* @author Sandy
* @since 1.0.0 15th 12 2016
*/
public class CodeUtil {
private int width=85;//image width
private int height = 30;//image height
private int codeCount = 5;// 验证码字符个数
private int lineCount = 150;// 验证码干扰线数
private String code ;// validation code
private BufferedImage buffImg; // validation image code
private static final char[] codeSequence = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
'x', 'y', 'z', '0','1', '2', '3', '4', '5', '6', '7', '8', '9' };
private static final char[] number_code_Sequence = {'0' ,'1', '2', '3', '4', '5', '6', '7', '8', '9' };
public CodeUtil() { super(); }
/**
* @param image width
* @param image height
*/
public CodeUtil(int width,int height) {
this.width=width;
this.height=height;
this.createCodeAndImage();
}
/**
* image Font Byte
*
* @author Sandy
* @since 1.0.0 01th 12 2016
*/
class ImgFontByte {
public Font getFont(int fontHeight) {
try {
Font baseFont = Font.createFont(Font.TRUETYPE_FONT, new ByteArrayInputStream(hex2byte(getFontByteStr())));
return baseFont.deriveFont(Font.PLAIN, fontHeight);
} catch (Exception e) {
return new Font("Arial", Font.PLAIN, fontHeight);
}
}
private byte[] hex2byte(String str) {
if (str == null) {
return null;
}
str = str.trim();
int len = str.length();
if (len == 0 || len % 2 == 1) {
return null;
}
byte[] b = new byte[len / 2];
try {
for (int i = 0; i < str.length(); i += 2) {
b[i / 2] = (byte) Integer.decode("0x" + str.substring(i, i + 2)).intValue();
}
return b;
} catch (Exception e) {
return null;
}
}
private String getFontByteStr() {
return null;
}
}
/**
* @param width 图片宽
* @param height 图片高
* @param codeCount 字符个数
* @param lineCount 干扰线条数
*/
public CodeUtil(int width,int height,int codeCount,int lineCount) {
this.width=width;
this.height=height;
this.codeCount=codeCount;
this.lineCount=lineCount;
this.createCodeAndImage();
}
public static String createNumberCode(int codeCount){
// 生成随机数
Random random = new Random();
// randomCode记录随机产生的验证码
StringBuilder randomCode = new StringBuilder();
// 随机产生codeCount个字符的验证码。
for (int i = 0; i < codeCount; i++) {
// 将产生的四个随机数组合在一起。
randomCode.append(String.valueOf(number_code_Sequence[random.nextInt(number_code_Sequence.length)]));
}
return randomCode.toString();
}
public String createCode(int codeCount){
Random random = new Random();// 生成随机数
// randomCode记录随机产生的验证码
StringBuilder randomCode = new StringBuilder();
// 随机产生codeCount个字符的验证码。
for (int i = 0; i < codeCount; i++) {
// 将产生的四个随机数组合在一起。
randomCode.append(String.valueOf(codeSequence[random.nextInt(codeSequence.length)]));
}
code=randomCode.toString();
return code;
}
public void createCodeAndImage() {
int x = 0,fontHeight=0,y=0;
int red = 0, green = 0, blue = 0;
x = width / (codeCount + 2);//每个字符的宽度
fontHeight = height - 2;//字体的高度
y = height - 4;// 图像buffer
buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
Graphics2D g = buffImg.createGraphics();
Random random = new Random();// 生成随机数
// 将图像填充为白色
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
ImgFontByte imgFont=new ImgFontByte(); // 创建字体
Font font =imgFont.getFont(fontHeight);
g.setFont(font);
for (int i = 0; i < lineCount; i++) {
int xs = random.nextInt(width);
int ys = random.nextInt(height);
int xe = xs+random.nextInt(width/8);
int ye = ys+random.nextInt(height/8);
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
g.setColor(new Color(red, green, blue));
g.drawLine(xs, ys, xe, ye);
}
// randomCode记录随机产生的验证码
StringBuffer randomCode = new StringBuffer();
// 随机产生codeCount个字符的验证码。
for (int i = 0; i < codeCount; i++) {
String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
red = random.nextInt(155);
green = random.nextInt(155);
blue = random.nextInt(155);
g.setColor(new Color(red, green, blue));
g.drawString(strRand, 0 < i ? (1 + i ) * x : 5, y);
// 将产生的四个随机数组合在一起。
randomCode.append(strRand);
}
// 将四位数字的验证码保存到Session中。
code=randomCode.toString();
}
public static String generateCode(int length) {
Random r = new Random(System.nanoTime());
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
int d =r.nextInt(codeSequence.length);
sb.append(codeSequence[d]);
}
return sb.toString();
}
public void write(String path) throws IOException {
OutputStream sos = new FileOutputStream(path);
this.write(sos);
}
public void write(OutputStream sos) throws IOException {
ImageIO.write(buffImg, "png", sos);
sos.close();
}
public BufferedImage getBuffImg() {
return buffImg;
}
public String getCode() {
return code;
}
}