java入门教程：网络通信例子(一)
java网络通信例基础入门教程一
?
文件ExtendString.java
?
package chapter09.sample9_1;public class ExtendString { public ExtendString() { } /** 去掉字符串两端的空白字符,并将字符串转化为中国的标准字符gb2312的字符串. */ public String CS(String str) { //去掉字符串2端的空白字符 try { if (str == null) return ""; str = str.trim(); if (str == null) return ""; str = new String(str.getBytes("8859_1"), "GBK"); } catch (Exception e) { System.out.println(e); } return str; }}?
文件MailSender.java
?
package chapter09.sample9_1;import java.io.*;import java.util.*;import java.io.File; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.Date; import java.util.Properties; import javax.activation.DataHandler; import javax.activation.DataSource; import javax.activation.FileDataSource; import javax.mail.Authenticator; import javax.mail.BodyPart; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Multipart; import javax.mail.PasswordAuthentication; import javax.mail.SendFailedException; 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; import org.htmlparser.Node; import org.htmlparser.Parser; import org.htmlparser.tags.ImageTag; import org.htmlparser.util.ParserException; public class MailSender {private String username = null; //邮件发送帐号用户名 private String userpasswd = null; //邮件发送帐号用户口令 protected BodyPart messageBodyPart = null; protected Multipart multipart = new MimeMultipart("related"); protected MimeMessage mailMessage = null; protected Session mailSession = null; protected Properties mailProperties = System.getProperties(); protected InternetAddress mailFromAddress = null; protected InternetAddress mailToAddress = null; protected Authenticator authenticator = null; protected String mailSubject = ""; protected Date mailSendDate = null; /** * 构造函数 * @param smtpHost * @param username * @param password */ protected MailSender(String smtpHost, String username, String password) { this.username = username; this.userpasswd = password; mailProperties.put("mail.smtp.host", smtpHost); mailProperties.put("mail.smtp.auth", "true"); //设置smtp认证，很关键的一句 mailSession = Session.getDefaultInstance(mailProperties); mailMessage = new MimeMessage(mailSession); messageBodyPart = new MimeBodyPart(); } /** * 构造一个纯文本邮件发送实例 * @param smtpHost * @param username * @param password * @return */ public static MailSender getTextMailSender(String smtpHost, String username, String password) { return new MailSender(smtpHost,username,password) { public void setMailContent(String mailContent) throws MessagingException { messageBodyPart.setText(mailContent); multipart.addBodyPart(messageBodyPart); } }; } /** * 构造一个超文本邮件发送实例 * @param smtpHost * @param username * @param password * @return */ public static MailSender getHtmlMailSender(String smtpHost, String username, String password) { return new MailSender(smtpHost,username,password) { private ArrayList arrayList1 = new ArrayList(); private ArrayList arrayList2 = new ArrayList(); public void setMailContent(String mailContent) throws MessagingException { String htmlContent = getContent("<img src=", mailContent); messageBodyPart.setContent(htmlContent, "text/html;charset=GB2312"); multipart.addBodyPart(messageBodyPart); //调用处理html文件中的图片方法 processHtmlImage(mailContent); } //处理html页面上的图片方法如下： private void processHtmlImage(String mailContent) throws MessagingException { for (int i = 0; i < arrayList1.size(); i++) { messageBodyPart = new MimeBodyPart(); DataSource source = new FileDataSource((String) arrayList1.get(i)); messageBodyPart.setDataHandler(new DataHandler(source)); String contentId = "<" + (String) arrayList2.get(i) + ">"; messageBodyPart.setHeader("Content-ID", contentId); messageBodyPart.setFileName((String) arrayList1.get(i)); multipart.addBodyPart(messageBodyPart); } } //处理要发送的html文件，主要是针对html文件中的图片 private String getContent(String searchString, String mailContent) { try { Parser parser = Parser.createParser(new String(mailContent.getBytes(), ISO8859_1)); Node[] images = parser.extractAllNodesThatAre(ImageTag.class); for(int i=0;i<images.length;i++) { ImageTag imgTag = (ImageTag) images[i]; if(!imgTag.getImageURL().toLowerCase().startsWith("http://")) arrayList1.add(imgTag.getImageURL()); } } catch (UnsupportedEncodingException e1) { } catch (ParserException e) {} String afterReplaceStr = mailContent; //在html文件中用"cid:"+Content-ID来替换原来的图片链接 for (int m = 0; m < arrayList1.size(); m++) { arrayList2.add(createRandomStr()); String addString = "cid:" + (String) arrayList2.get(m); afterReplaceStr = mailContent.replaceAll( (String) arrayList1.get(m), addString); } return afterReplaceStr; } //产生一个随机字符串，为了给图片设定Content-ID值 private String createRandomStr() { char[] randomChar = new char[8]; for (int i = 0; i < 8; i++) { randomChar[i] = (char) (Math.random() * 26 + 'a'); } String replaceStr = new String(randomChar); return replaceStr; } private final static String ISO8859_1 = "8859_1"; }; } /** * 用于实现邮件发送用户验证 * @see javax.mail.Authenticator#getPasswordAuthentication */ protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username, userpasswd); } /** * 设置邮件标题 * @param mailSubject * @throws MessagingException */ public void setSubject(String mailSubject) throws MessagingException { this.mailSubject = mailSubject; mailMessage.setSubject(mailSubject); } /** * 所有子类都需要实现的抽象方法，为了支持不同的邮件类型 * @param mailContent * @throws MessagingException */ protected void setMailContent(String mailContent) throws MessagingException {} /** * 设置邮件发送日期 * @param sendDate * @throws MessagingException */ public void setSendDate(Date sendDate) throws MessagingException { this.mailSendDate = sendDate; mailMessage.setSentDate(sendDate); } /** * 设置邮件发送附件 * @param attachmentName * @throws MessagingException */ public void setAttachments(String attachmentName) throws MessagingException { messageBodyPart = new MimeBodyPart(); DataSource source = new FileDataSource(attachmentName); messageBodyPart.setDataHandler(new DataHandler(source)); int index = attachmentName.lastIndexOf(File.separator); String attachmentRealName = attachmentName.substring(index + 1); messageBodyPart.setFileName(attachmentRealName); multipart.addBodyPart(messageBodyPart); } /** * 设置发件人地址 * @param mailFrom * @throws MessagingException */ public void setMailFrom(String mailFrom) throws MessagingException { mailFromAddress = new InternetAddress(mailFrom); mailMessage.setFrom(mailFromAddress); } /** * 设置收件人地址，收件人类型为to,cc,bcc(大小写不限) * @param mailTo 邮件接收者地址 * @param mailType 值为to,cc,bcc * @author Liudong */ public void setMailTo(String[] mailTo, String mailType) throws Exception { for (int i = 0; i < mailTo.length; i++) { mailToAddress = new InternetAddress(mailTo[i]); if (mailType.equalsIgnoreCase("to")) { mailMessage.addRecipient(Message.RecipientType.TO,mailToAddress); } else if (mailType.equalsIgnoreCase("cc")) { mailMessage.addRecipient(Message.RecipientType.CC,mailToAddress); } else if (mailType.equalsIgnoreCase("bcc")) { mailMessage.addRecipient(Message.RecipientType.BCC,mailToAddress); } else { throw new Exception("Unknown mailType: " + mailType + "!"); } } } /** * 开始发送邮件 * @throws MessagingException * @throws SendFailedException */ public void sendMail() throws MessagingException, SendFailedException { if (mailToAddress == null) throw new MessagingException("请你必须你填写收件人地址！"); mailMessage.setContent(multipart); Transport.send(mailMessage); } /** * 邮件发送测试 * @param args */ public static void main(String args[]) { String mailHost = "smtp.gmail.com"; //发送邮件服务器地址 String mailUser = "hujie1982"; //发送邮件服务器的用户帐号 String mailPassword = "123456"; //发送邮件服务器的用户密码 String[] toAddress = {"pp1982@gmail.com"}; //使用超文本格式发送邮件 MailSender sendmail = MailSender.getHtmlMailSender(mailHost, mailUser,mailPassword); //使用纯文本格式发送邮件 //MailSender sendmail = MailSender.getTextMailSender(mailHost, mailUser,mailPassword); try { sendmail.setSubject("要发送的标题？"); sendmail.setSendDate(new Date()); String content = "hello world"; //请注意如果是本地图片比如使用斜杠作为目录分隔符,如下所示,不支持中文？？？！！！ // content+="<img src="C:/Documents and Settings/Administrator/My Documents/My Pictures/aaa.jpg"/>"; //sendmail.setMailContent(content); // //sendmail.setAttachments("E:\\ConList.exe");//文章附件 sendmail.setMailFrom("hujie1982@gmail.com");//显示谁发送的 sendmail.setMailTo(toAddress, "to");//cc抄送，bcc 暗送 //sendmail.setMailTo(toAddress, "cc");//设置抄送给... //开始发送邮件 System.out.println("正在发送邮件，请稍候......."); sendmail.sendMail(); System.out.println("恭喜你，邮件已经成功发送!"); } catch (Exception ex) { ex.printStackTrace(); } } }?
文件Sample9_1.java
?
package chapter09.sample9_1;import java.io.*;import java.net.*;public class Sample9_1 {public static void main(String[] args){try{//创建URL对象URL url=new URL("http://www.sina.com");//打开指向资源的输入流InputStream in=url.openStream();//将输入流由字节流转换为字符流InputStreamReader isr=new InputStreamReader(in);//将输入流封装为缓冲输入处理流BufferedReader br=new BufferedReader(isr);//创建输出流，并指定目标文件BufferedWriter bw=new BufferedWriter(new FileWriter("c:/URL.html"));//对输出流进一步进行封装PrintWriter pw=new PrintWriter(bw);//声明临时字符串引用String temps=null;//从输入流中获取资源并测试是否读取完毕while((temps=br.readLine())!=null){//将获取的数据写如目标文件pw.println(temps);}//打印提示信息System.out.println("恭喜您，资源已经获取完毕，并将其写入了URL.html文件中！！！");//关闭输入流与输出流pw.close();br.close();}catch(Exception e){e.printStackTrace();}}}