📄 loginservlet.java

📁 Java实例入门
💻 JAVA
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package mailservlets;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;import javax.mail.*;import javax.mail.internet.*;/** * Title:        收发邮件 * Description:  这是一个使用Servlet开发的收发邮件应用程序 * Copyright:    Copyright (c) 2001 * Company: * @author * @version 1.0 */public class LoginServlet extends HttpServlet {  private static final String CONTENT_TYPE = "text/html; charset=gb2312";  private static final String POP3_HOSTNAME="pop3host";  private static final String SMTP_HOSTNAME="smtphost";  private static final String USERNAME="username";  private static final String PASSWORD="password";  /**Initialize global variables*/  public void init() throws ServletException {  }  /**Process the HTTP Get request*/  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    response.setContentType(CONTENT_TYPE);    PrintWriter out = response.getWriter();    out.println("<html>");    out.println("<head><title>邮箱登录</title>");    out.println("<META>");    out.println("<STYLE media=screen type=text/css></STYLE>");    out.println("<LINK href=\"/MailWebApp/css.css\" rel=stylesheet type=text/css></head>");    out.println("<body>");    out.println("<P ALIGN=\"CENTER\"><B><FONT SIZE=\"5\" FACE=\"Arial, Helvetica\">邮箱登录</FONT></B></P>");    out.println("<FORM ACTION=\"/MailWebApp/loginservlet\" METHOD=\"POST\" ENCTYPE=\"application/x-www-form-urlencoded\">");    out.println("<TABLE BORDER=\"0\" WIDTH=\"100%\">");    out.println("<TR>");    out.println("<TD class=tab03 WIDTH=\"40%\"><P ALIGN=\"RIGHT\"><FONT FACE=\"Arial, Helvetica\">SMTP服务器：</FONT></TD>");    out.println("<TD class=tab03 WIDTH=\"60%\"><INPUT TYPE=\"TEXT\" NAME=\"SmtpHost\" SIZE=\"25\"></TD>");    out.println("</TR>");    out.println("<TR>");    out.println("<TD class=tab03 WIDTH=\"40%\"><P ALIGN=\"RIGHT\"><FONT FACE=\"Arial, Helvetica\">POP3服务器：</FONT></TD>");    out.println("<TD class=tab03 WIDTH=\"60%\"><INPUT TYPE=\"TEXT\" NAME=\"Pop3Host\" SIZE=\"25\"></TD>");    out.println("</TR>");    out.println("<TR>");    out.println("<TD class=tab03 WIDTH=\"40%\"><P ALIGN=\"RIGHT\"><FONT FACE=\"Arial, Helvetica\">用户名：</FONT></TD>");    out.println("<TD class=tab03 WIDTH=\"60%\"><INPUT TYPE=\"TEXT\" NAME=\"UserName\" SIZE=\"25\"></TD>");    out.println("</TR>");    out.println("<TR>");    out.println("<TD class=tab03 WIDTH=\"40%\"><P ALIGN=\"RIGHT\"><FONT FACE=\"Arial, Helvetica\">密码：</FONT></TD>");    out.println("<TD class=tab03 WIDTH=\"60%\"><INPUT TYPE=\"PASSWORD\" NAME=\"PassWord\" SIZE=\"25\"></TD>");    out.println("</TR>");    out.println("</TABLE>");    out.println("<P align=center><INPUT TYPE=\"SUBMIT\" VALUE=\"Login\"><INPUT TYPE=\"RESET\" NAME=\"Reset\" VALUE=\"Reset\">");    out.println("</FORM>");    out.println("</body></html>");  }  /**Process the HTTP Post request*/  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    response.setContentType(CONTENT_TYPE);    PrintWriter out = response.getWriter();    out.println("<html>");    out.println("<head><title>您的收件箱</title>");    out.println("<META>");    out.println("<STYLE media=screen type=text/css></STYLE>");    out.println("<LINK href=\"/MailWebApp/css.css\" rel=stylesheet type=text/css></head>");    out.println("<body>");    try{    HttpSession session=request.getSession(true);    System.out.println(session.getMaxInactiveInterval());    session.setMaxInactiveInterval(-1);    String pop3Server=request.getParameter("Pop3Host") ;    if(pop3Server==null)        pop3Server=(String)session.getValue(POP3_HOSTNAME);    else        session.setAttribute(POP3_HOSTNAME,pop3Server);    String smtpServer=request.getParameter("SmtpHost") ;    if(smtpServer==null)        smtpServer=(String)session.getValue(SMTP_HOSTNAME);    else        session.setAttribute(SMTP_HOSTNAME,smtpServer);    String UserName=request.getParameter("UserName") ;    if(UserName==null)        UserName=(String)session.getValue(USERNAME);    else        session.setAttribute(USERNAME,UserName);    String Password=request.getParameter("PassWord") ;    if(Password==null)        Password=(String)session.getValue(PASSWORD);    else        session.setAttribute(PASSWORD,Password);    Properties props=System.getProperties();    props.put("mail.smtp.host",smtpServer);    props.put("mail.host",pop3Server);    props.put("mail.protocol","pop3");    SmtpAuthenticator sa=new SmtpAuthenticator(UserName,Password);    Session mailSession=Session.getDefaultInstance(props,sa);    mailSession.setDebug(true);    Store mailbox=mailSession.getStore("pop3");    mailbox.connect(pop3Server,UserName,Password);    Folder folder=mailbox.getFolder("INBOX");    folder.open(Folder.READ_ONLY);    Message msg[]=folder.getMessages();    out.println("<P ALIGN=\"CENTER\"><B><FONT SIZE=\"3\" FACE=\"Arial, Helvetica\">您的收件箱中共有"+msg.length+"封邮件</FONT></B></P>");    out.println("<TABLE border=0 cellPadding=0 cellSpacing=0 class=tab02 width=\"75%\">");    out.println("<TBODY>");    out.println("<TR>");    out.println("<TD> <A href=/MailWebApp/sendmail target=\"_self\">发邮件</A></TD>");    out.println("<TD> <A href=/MailWebApp/loginservlet target=_self>返回</A></TD>");    out.println("</TR>");    out.println("</TBODY>");    out.println("</TABLE>");    out.println("<TABLE border=0 cellPadding=2 cellSpacing=1 height=19 width=\"75%\">");    out.println("<TBODY>");    out.println("<TR>");    out.println("<TD align=middle class=tab01 height=9>发件人</TD>");    out.println("<TD align=middle class=tab01 height=9>主题</TD>");    out.println("<TD align=middle class=tab01 height=9>日期</TD>");    out.println("<TD align=middle class=tab01 height=9>大小</TD>");    out.println("</TR>");    for(int i=1;i<=msg.length ;i++){       out.println("<TR>");       out.println("<TD align=left bgColor=#ffffff class=tab02 height=9>");       Address fromAddr[]=msg[i-1].getFrom();       for(int j=1;j<=fromAddr.length;j++){          out.println(" "+fromAddr[j-1].toString());       }       out.println("</TD>");       out.println("<TD align=left bgColor=#ffffff class=tab02 height=9>");       out.println("<A href=/MailWebApp/showmail?mid="+msg[i-1].getMessageNumber()+" target=\"_self\">");       out.println(msg[i-1].getSubject()+"</A></TD>");       out.println("<TD align=left bgColor=#ffffff class=tab02 height=9>"+msg[i-1].getReceivedDate()+"</TD>");       out.println("<TD align=left bgColor=#ffffff class=tab02 height=9>"+msg[i-1].getSize()+"</TD>");       out.println("</TR>");    }    out.println("</TBODY>");    out.println("</TABLE>");    mailbox.close();    out.println("<TABLE border=0 cellPadding=0 cellSpacing=0 class=tab02 width=\"75%\">");    out.println("<TBODY>");    out.println("<TR>");    out.println("<TD> <A href=/MailWebApp/sendmail target=\"_self\">发邮件</A></TD>");    out.println("<TD> <A href=/MailWebApp/loginservlet target=\"_self\">返回</A></TD>");    out.println("</TR>");    out.println("</TBODY>");    out.println("</TABLE>");    }catch(Exception e){         out.println("<P ALIGN=\"CENTER\"><B><FONT SIZE=\"3\" FACE=\"Arial, Helvetica\">错误发生</FONT></B></P>");    }    out.println("</body></html>");  }  /**Clean up resources*/  public void destroy() {  }}
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