JavaWeb开发常用工具类
图片验证码
package cn.liuweiwei.utils;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
/**
* 动态生成图片
*/
public class VerificationCode {
// {"宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312"}
private static String[] fontNames = { "宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312" };
// 可选字符
//"23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";
private static String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";
// 背景色
private Color bgColor = new Color(255, 255, 255);
// 基数(一个文字所占的空间大小)
private int base = 30;
// 图像宽度
private int width = base * 4;
// 图像高度
private int height = base;
// 文字个数
private int len = 4;
// 设置字体大小
private int fontSize = 22;
// 验证码上的文本
private String text;
//图片的缓冲流
private BufferedImage img = null;
//画笔
private Graphics2D g2 = null;
/**
* 生成验证码图片
* @param outputStream 传入一个输出流，就是将该图片输出到哪里
*/
public void drawImage(OutputStream outputStream) {
// 1.创建图片缓冲区对象, 并设置宽高和图像类型
img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 2.得到绘制环境
g2 = (Graphics2D) img.getGraphics();
// 3.开始画图
// 设置背景色
g2.setColor(bgColor);
//设置画笔的开始位置，0,0代表左上角
g2.fillRect(0, 0, width, height);
StringBuffer sb = new StringBuffer();// 用来装载验证码上的文本
for (int i = 0; i < len; i++) {
// 设置画笔颜色 -- 随机
// g2.setColor(new Color(255, 0, 0));
g2.setColor(new Color(getRandom(0, 150), getRandom(0, 150),getRandom(0, 150)));
// 设置字体
g2.setFont(new Font(fontNames[getRandom(0, fontNames.length)], Font.BOLD, fontSize));
// 旋转文字(-45~+45)
int theta = getRandom(-45, 45);
g2.rotate(theta * Math.PI / 180, 7 + i * base, height - 8);
// 写字
String code = codes.charAt(getRandom(0, codes.length())) + "";
g2.drawString(code, 7 + i * base, height - 8);
sb.append(code);
g2.rotate(-theta * Math.PI / 180, 7 + i * base, height - 8);
}
this.text = sb.toString();
// 画干扰线
for (int i = 0; i < len + 2; i++) {
// 设置画笔颜色 -- 随机
// g2.setColor(new Color(255, 0, 0));
g2.setColor(new Color(getRandom(0, 150), getRandom(0, 150),
getRandom(0, 150)));
g2.drawLine(getRandom(0, 120), getRandom(0, 30), getRandom(0, 120),
getRandom(0, 30));
}
//绘制边框
g2.setColor(Color.GRAY);
//0,0是坐标值，左上角是0,0坐标，宽高都-1为了比矩形小一点，看着好看一些
g2.drawRect(0, 0, width-1, height-1);
// 4.保存图片到指定的输出流
try {
ImageIO.write(this.img, "JPEG", outputStream);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}finally{
// 5.释放资源
g2.dispose();
}
}
/**
* 获取验证码字符串
* @return
*/
public String getCode() {
return this.text;
}
/*
* 生成随机数的方法
*/
private static int getRandom(int start, int end) {
Random random = new Random();
return random.nextInt(end - start) + start;
}
//测试
public static void main(String[] args) throws Exception {
VerificationCode code = new VerificationCode();
code.drawImage(new FileOutputStream("f:/vc.jpg"));
System.out.println("执行成功~!");
System.out.println(code.getCode());
}
}
QQ邮箱验证码工具类
// package cn.liuweiwei.util;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message.RecipientType;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class MailUtils {
// 发送方邮箱地址
private static String senderEmailAddress = "vivi.love.java@qq.com";
// 发送邮件的标题
private static String senderEmailHeader = "验证码";
// 开启服务的授权码
private static String authecticationPassword = "保密";
/**
* 设置邮件的标题、默认为验证码
*
* @param header
*/
public static void setEmailHeader(String header) {
senderEmailHeader = header;
}
/**
* 发送邮件的方法
*
* @param receiverEmailAdderss 接收方的邮箱地址
* @param emailMessage 要发送的邮件信息
* @throws Exception
*/
public static void sendMail(String receiverEmailAdderss, Object emailMessage) throws Exception {
Properties properties = new Properties();
properties.setProperty("mail.transport.protocol", "SMTP");
properties.setProperty("mail.host", "smtp.qq.com");
properties.setProperty("mail.smtp.auth", "true");
Authenticator authenticator = new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(senderEmailAddress, authecticationPassword);
}
};
Session session = Session.getInstance(properties, authenticator);
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(senderEmailAddress));
message.setRecipient(RecipientType.TO, new InternetAddress(receiverEmailAdderss));
message.setSubject(senderEmailHeader);
message.setContent(emailMessage, "text/html;charset=utf-8");
Transport.send(message);
}
// 测试
public static void main(String[] args) throws Exception {
sendMail("233@qq.com", "澳门赌场上线啦！！！");
}
}
生成少量个数字符串的工具类
ps可以配合邮箱验证码使用
// package cn.liuweiwei.util;
import java.util.Random;
public class RandomCharsUtils {
private static char[] chars = null;
private static Random random = new Random();
private RandomCharsUtils() {
}
static {
initChars();
}
private static void initChars() {
chars = "abcdefghijklmnopqrstuvwxyz0123456789".toCharArray();
}
public static String RandomChars(int number) {
String result = "";
for (int i = 0; i < number; i++) {
result += chars[RandomIndex()];
}
return result;
}
private static int RandomIndex() {
return random.nextInt(chars.length);
}
}
发送邮箱验证码时需要开通qq邮箱相关的服务、自行百度解决