几个好玩的工具类

图片排序

public class FileRenameUtil {
    public static void rename(String path){
        File file = new File(path);
        File[] files = file.listFiles();
        int i = 0;
        for (File file1 : files) {
            if (!file1.isDirectory()){
                file1.renameTo(new File(path + i + ".jpg"));
                i++;
            }
        }
        System.out.println("执行完成");
    }
    public static void main(String[] args) {
        String path = "D:/1/";
        rename(path);
    }
}

发邮件

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

/**
 * 发邮件工具类
 */
public final class MailUtils {
    private static final String USER = "****"; // 发件人称号，同邮箱地址
    private static final String PASSWORD = "****"; // 如果是qq邮箱可以使户端授权码，或者登录密码

    /**
     *
     * @param to 收件人邮箱
     * @param text 邮件正文
     * @param title 标题
     */
    /* 发送验证信息的邮件 */
    public static boolean sendMail(String to, String text, String title){
        try {
            final Properties props = new Properties();
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.host", "smtp.qq.com");

            // 发件人的账号
            props.put("mail.user", USER);
            //发件人的密码
            props.put("mail.password", PASSWORD);

            // 构建授权信息，用于进行SMTP进行身份验证
            Authenticator authenticator = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    // 用户名、密码
                    String userName = props.getProperty("mail.user");
                    String password = props.getProperty("mail.password");
                    return new PasswordAuthentication(userName, password);
                }
            };
            // 使用环境属性和授权信息，创建邮件会话
            Session mailSession = Session.getInstance(props, authenticator);
            // 创建邮件消息
            MimeMessage message = new MimeMessage(mailSession);
            // 设置发件人
            String username = props.getProperty("mail.user");
            InternetAddress form = new InternetAddress(username);
            message.setFrom(form);

            // 设置收件人
            InternetAddress toAddress = new InternetAddress(to);
            message.setRecipient(Message.RecipientType.TO, toAddress);

            // 设置邮件标题
            message.setSubject(title);

            // 设置邮件的内容体
            message.setContent(text, "text/html;charset=UTF-8");
            // 发送邮件
            Transport.send(message);
            return true;
        }catch (Exception e){
            e.printStackTrace();
        }
        return false;
    }

    public static void main(String[] args) throws Exception {
        for (int i = 0; i < 30; i++) {
            MailUtils.sendMail("***","哥们挺会玩啊","亮爷");
            System.out.println("发送成功");
        }
    }
}

循环发送QQ消息

import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.event.KeyEvent;
public class Test {
    public static void main(String[] args)throws AWTException {
        Clipboard clip = Toolkit.getDefaultToolkit().getSystemClipboard();
        Transferable tText = null;
        Toolkit tolkit = Toolkit.getDefaultToolkit();
        Robot robot = new Robot();
        robot.delay(10000);
        for (int i = 0; i < 10; i++) {
            String str = "/tp";
            tText = new StringSelection("爱你每一天"+str);
            clip.setContents(tText, null);
            robot.keyPress( KeyEvent.VK_CONTROL);
            robot.keyPress(KeyEvent.VK_V);
            robot.keyRelease(KeyEvent.VK_CONTROL);
            robot.delay(1000);
            robot.keyPress( KeyEvent.VK_ENTER);
        }
    }
}