java入门教程：网络通信例子(一)

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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();}}}

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