BlogJava-J2EE-UP-随笔分类-Java

Map排序

Jarry — Tue, 02 Aug 2011 02:09:00 GMT

主要是通过TreeMap来排序。

import java.util.Iterator;
import java.util.Set;
import java.util.TreeMap;

public class MapTest
{
    public static void main(String args[])
    {
        TreeMap<Integer, String> maps = new TreeMap<Integer, String>();
        maps.put(2, "Test2");
        maps.put(1, "Test1");
        maps.put(4, "Test4");
        maps.put(3, "Test3");

        Set set = maps.keySet();
        Iterator iter = set.iterator();

        while (iter.hasNext())
        {
            Object key = iter.next();
            System.out.println(key + " " + maps.get(key));
        }
    }
}

Jarry 2011-08-02 10:09 发表评论

字符的截取

Jarry — Mon, 18 Jul 2011 03:29:00 GMT

public static void main(String[] args)
    {
        String str = "我ABC们";
        char[] ch = new char[4];
        str.getChars(1, 5, ch, 0);

        System.out.println(String.valueOf(ch));

    }

Jarry 2011-07-18 11:29 发表评论

简单的线程控制

Jarry — Tue, 19 Apr 2011 03:13:00 GMT

DataThread.java控制其他线程是否运行：

public class DataThread extends Thread
{
    public void run()
    {
        SendThread send = null;
        Thread SendThread = new Thread(send);
        while (true)
        {
            try
            {
                if ("0158".equals(WmsFormatter.toParamTime(new Date()).substring(0, 4)))
                {
                    if (SendThread.isAlive())
                    {
                        send.close();
                    }
                }

                if (!hostSendThread.isAlive())
                    {
                        send = new SendThread();
                        SendThread = new Thread(send);
                        SendThread.start();
                    }
                Thread.sleep(50000);
            }catch (Exception e)
            {
             try {
                    e.printStackTrace();
                        continue;
                   } catch (Exception e1) {
                         continue;
                   }
            }
        }
    }

    public static void main(String[] args)
    {
        new DataThread().start();
    }

SendThread.java

public class SendThread implements Runnable
{
    private boolean flag = true;

    public void close()
    {
        flag = false;
    }

    public void run()
    {
        while (flag == true)
        {

        }
    }
}

Jarry 2011-04-19 11:13 发表评论

一些数据操作

Jarry — Tue, 19 Apr 2011 03:04:00 GMT

摘要: /** *//** * 字符型后面加空格 * * @param str ... 阅读全文

Jarry 2011-04-19 11:04 发表评论

FTP上传、下载、删除

Jarry — Tue, 19 Apr 2011 02:48:00 GMT

摘要: 可以实现FTP的链接，获取文件列表，上传文件，下载文件，删除文件，新建文件夹。 FtpServer.java 内存如下： import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.Inpu... 阅读全文

Jarry 2011-04-19 10:48 发表评论

SMTP邮件发送

Jarry — Tue, 19 Apr 2011 02:42:00 GMT

SMTP邮件发送，需要一个SMTP邮件服务器。

1.验证发件人的授权
新建java类，MyAuthenticator.java 内容如下：

import javax.mail.PasswordAuthentication;

class MyAuthenticator extends javax.mail.Authenticator
{
    private String strUser;

    private String strPwd;

    public MyAuthenticator(String user, String password)
    {
        this.strUser = user;
        this.strPwd = password;
    }

    protected PasswordAuthentication getPasswordAuthentication()
    {
        return new PasswordAuthentication(strUser, strPwd);
    }
}

2.SMTP邮件发送
新建java类，SendEmail.java 内存如下：

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class SendEmail
{
    private static String host     = ""; // SMTP服务器地址

    private static String password = ""; // 密码

    private static String from     = ""; // 发件人

    private static String to       = "";  // 收件人

    private static String cc       = “”;  // 抄送人（中间使用;隔开）

    public static void send(String subject, String content, String filename)
    {
        Properties props = System.getProperties();

        props.put("mail.smtp.host", host);//指定SMTP服务器
        props.put("mail.transpost.protocol", "smtp");
        props.put("mail.smtp.port", "25");
        props.put("mail.smtp.auth", "true");//指定是否需要SMTP验证

        //需要SSL安全验证
        props.setProperty("mail.smtp.starttls.enable", "true");

//        props.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
//        props.setProperty("mail.smtp.socketFactory.fallback", "false");
//        props.setProperty("mail.smtp.socketFactory.port", "25");
        try
        {
            MyAuthenticator myauth = new MyAuthenticator(from, password);
            Session mailSession = Session.getDefaultInstance(props, myauth);
            mailSession.setDebug(true);//是否在控制台显示debug信息

            Message message = new MimeMessage(mailSession);
            message.setFrom(new InternetAddress(from));//发件人
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));//收件人
            // 是否有抄送人
            if (!StringUtil.isBlank(cc))
            {
                String[] bccs = cc.split(";");
                InternetAddress bcc = null;
                InternetAddress[] bccAddrs = new InternetAddress[bccs.length];
                for (int i = 0; i < bccs.length; i++)
                {
                    if (!"".equals(bccs[i].trim()))
                    {
                        bcc = new InternetAddress(bccs[i].trim());
                        bccAddrs[i] = bcc;
                    }
                }
                message.setRecipients(Message.RecipientType.CC, bccAddrs);
            }
            message.setSubject(subject);//邮件主题
            // 有附件
            if (!StringUtil.isBlank(filename))
            {
                Multipart mp = new MimeMultipart();
                BodyPart bp = new MimeBodyPart();

                bp.setContent(content, "text/html;charset=utf-8");//邮件正文
                mp.addBodyPart(bp);

                File file = new File(filename);
                if (file.exists())
                {
                    BodyPart mdp = new MimeBodyPart();
                    FileDataSource fileds = new FileDataSource(file);
                    mdp.setDataHandler(new DataHandler(fileds));
                    mdp.setFileName(fileds.getName());
                    mp.addBodyPart(mdp);
                }
                message.setContent(mp);
            }
            // 无附件
            else
            {
                message.setContent(content, "text/html;charset=utf-8");//邮件正文
            }
            message.saveChanges();

            Transport.send(message);

        }
        catch (Exception e)
        {
            return;
        }
    }

    public static void main(String[] args)
    {
        SendEmail.send("测试邮件", "邮件发送测试！",  "本地附件地址");
    }

Jarry 2011-04-19 10:42 发表评论

Java抽取Word，PDF格式文件

Jarry — Thu, 14 Feb 2008 06:08:00 GMT

摘要: 1. 用jacob 其实jacob是一个bridage，连接java和com或者win32函数的一个中间件，jacob并不能直接抽取word,excel等文件，需要自己写dll哦，不过已经有为你写好的了，就是jacob的作者一并提供了。 jacob jar与dll文件下载： http://danadler.com/jacob/ 下载了jacob并放到指定的路径之后(dll放到... 阅读全文

Jarry 2008-02-14 14:08 发表评论