请问大侠:用javamail死循环取指定邮箱的邮件,程序不定时死,为什么?

Question

写LOG，大概是有错误抛出你没有处理的原因。

Answer 1

我的接收邮件的源代码如下,java刚学习不很熟练,请指教):
另我想多问一个问题:如何跟踪java程序所使用的资源情况?在linux上?运行方式为java ...
import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import java.sql.*;
import javax.activation.*;public class Receive_mail
{      
       public static void main(String argv[])
       { String protocol="pop3";
         String host = ".......";/*某host名*/
         String user1 = ".....";/*邮箱1用户名*/
         String password1 = ".....";/*邮箱1口令*/
         String mbox = "INBOX";
         String url = null;
         int port = -1;
         String user2="......";/*邮箱2用户名*/
         String password2="......";/*邮箱2口令*/
         int conn_num=0;
         
         
         String full_path_filename="/var/test";
          Fy recv_mail;
          int ttt=1;
          do
            { 
              try
               { 
                recv_mail=new Fy(protocol,port,host,user1,password1,full_path_filename);
                conn_num++;
                System.out.println("\nconn_num="+conn_num);
                Thread.sleep(1);
                recv_mail=new Fy(protocol,port,host,user2,password2,full_path_filename);
               }catch(Exception ex)
                  {
                   System.out.println("Oops, got exception! " + ex.getMessage());
           ex.printStackTrace();
          }
          }while(true);
       }//end of main
}//end of public class Receive_mail
class Fy
{
   public Fy(String protocol,int port,String host,String user,String password,String path) 
   {
       
       int msgnum = -1;
       int optind;
       int i;
       String full_path_filename="/var/test";
      
       Properties props=new Properties();
       Session session;
       Store store;
       Folder inbox;
       URLName urln;
       Message m;
       int count;
       Boolean re_mail;
       urln=new URLName(host);
       RandomAccessFile Log;
       long Log_length;
       String s_mail_source="";
       Address[] mail_source_address;
       java.util.Date sent_date;
       java.util.Date receive_date;
       String s_sent_date="";
       String s_receive_date="";
       System.out.println("I am working now!\n"); 
         try {
      // Get a Properties object
   //   props = System.getProperties();
      // Get a Session object
      session = Session.getDefaultInstance(props, null);
    //  session.setDebug(debug);     //Get a Store object
       store = null;
       if (protocol != null)
    store =session.getStore("pop3");
// Connect
                      if(store.isConnected()==false)
                          {
                  if (host != null || user != null || password != null)
                          try{
                      store.connect(host, user, password);
                      System.out.println("do connect again\n");
                             }catch(Exception ex){System.out.println("I have error in store.connect!\n");}
                          }
           
    // Open the Folder
   if(store.isConnected()==true)
     inbox=store.getFolder("INBOX");
   else 
     {
      return;
     }
   if(store.isConnected()==true)
   {
     if(inbox.isOpen()!=true)
     {
              inbox.open(Folder.READ_WRITE);
              count=inbox.getMessageCount();
             }
           }
           if(count!=0)
           {
            for(i=1;i<=count;i++)  
                 {    System.out.println("I am  searching!\n");
                      m=inbox.getMessage(i);
                      mail_source_address=m.getFrom();
                      for(int j=0;j<mail_source_address.length;j++)
                                  {
                                     s_mail_source=s_mail_source+" "+mail_source_address[j].toString();
                                  }
                      System.out.println("the source address="+s_mail_source);
                      sent_date=m.getSentDate();
                      if(sent_date!=null)
                                       s_sent_date=sent_date.toString();
                      receive_date=m.getReceivedDate();
                      if(receive_date!=null)
                      s_receive_date=receive_date.toString();                      Log=new RandomAccessFile("/var/test/test.log","rw");
                      Log_length=Log.length();
                      Log.seek(Log_length);
                      Log.writeBytes(s_mail_source+"\r\n");
                      Log.close();
                      dumpPart(m,i);
                      m.setFlag(Flags.Flag.DELETED,true);
                     
               }//for end 
            } //if end   
            java.util.Date d=new java.util.Date();
            System.out.println("\n now is "+d.toString());
            if(store.isConnected()==true)
               {
                 System.out.println("\n the inbox state is "+inbox.isOpen());
               }
            if(store.isConnected()==true)
             {
              if(inbox.isOpen()==true)
               {
                        inbox.close(true);
                        System.out.println("\n the inbox state is "+inbox.isOpen());
               }
             }
            if(store.isConnected()==true)
             {
              System.out.println("\nthe store state is "+store.isConnected());
             }
            if(store.isConnected()==true)
                  store.close();
            System.out.println("\nthe store state is "+store.isConnected());
          }catch (Exception ex) 
             {
      System.out.println("Oops, got exception! " + ex.getMessage());
      ex.printStackTrace();
     }
          System.out.println("I am sleeping now\n");                 
    }    public static void dumpPart(Part p,int i) throws Exception
     {
     //处理邮件的部分
     }
  }

Answer 2

我的接收邮件的源代码如下,java刚学习不很熟练,请指教):
另我想多问一个问题:如何跟踪java程序所使用的资源情况?在linux上?运行方式为java ...
import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import java.sql.*;
import javax.activation.*;public class Receive_mail
{      
       public static void main(String argv[])
       { String protocol="pop3";
         String host = ".......";/*某host名*/
         String user1 = ".....";/*邮箱1用户名*/
         String password1 = ".....";/*邮箱1口令*/
         String mbox = "INBOX";
         String url = null;
         int port = -1;
         String user2="......";/*邮箱2用户名*/
         String password2="......";/*邮箱2口令*/
         int conn_num=0;
         
         
         String full_path_filename="/var/test";
          Fy recv_mail;
          int ttt=1;
          do
            { 
              try
               { 
                recv_mail=new Fy(protocol,port,host,user1,password1,full_path_filename);
                conn_num++;
                System.out.println("\nconn_num="+conn_num);
                Thread.sleep(1);
                recv_mail=new Fy(protocol,port,host,user2,password2,full_path_filename);
               }catch(Exception ex)
                  {
                   System.out.println("Oops, got exception! " + ex.getMessage());
           ex.printStackTrace();
          }
          }while(true);
       }//end of main
}//end of public class Receive_mail
class Fy
{
   public Fy(String protocol,int port,String host,String user,String password,String path) 
   {
       
       int msgnum = -1;
       int optind;
       int i;
       String full_path_filename="/var/test";
      
       Properties props=new Properties();
       Session session;
       Store store;
       Folder inbox;
       URLName urln;
       Message m;
       int count;
       Boolean re_mail;
       urln=new URLName(host);
       RandomAccessFile Log;
       long Log_length;
       String s_mail_source="";
       Address[] mail_source_address;
       java.util.Date sent_date;
       java.util.Date receive_date;
       String s_sent_date="";
       String s_receive_date="";
       System.out.println("I am working now!\n"); 
         try {
      // Get a Properties object
   //   props = System.getProperties();
      // Get a Session object
      session = Session.getDefaultInstance(props, null);
    //  session.setDebug(debug);     //Get a Store object
       store = null;
       if (protocol != null)
    store =session.getStore("pop3");
// Connect
                      if(store.isConnected()==false)
                          {
                  if (host != null || user != null || password != null)
                          try{
                      store.connect(host, user, password);
                      System.out.println("do connect again\n");
                             }catch(Exception ex){System.out.println("I have error in store.connect!\n");}
                          }
           
    // Open the Folder
   if(store.isConnected()==true)
     inbox=store.getFolder("INBOX");
   else 
     {
      return;
     }
   if(store.isConnected()==true)
   {
     if(inbox.isOpen()!=true)
     {
              inbox.open(Folder.READ_WRITE);
              count=inbox.getMessageCount();
             }
           }
           if(count!=0)
           {
            for(i=1;i<=count;i++)  
                 {    System.out.println("I am  searching!\n");
                      m=inbox.getMessage(i);
                      mail_source_address=m.getFrom();
                      for(int j=0;j<mail_source_address.length;j++)
                                  {
                                     s_mail_source=s_mail_source+" "+mail_source_address[j].toString();
                                  }
                      System.out.println("the source address="+s_mail_source);
                      sent_date=m.getSentDate();
                      if(sent_date!=null)
                                       s_sent_date=sent_date.toString();
                      receive_date=m.getReceivedDate();
                      if(receive_date!=null)
                      s_receive_date=receive_date.toString();                      Log=new RandomAccessFile("/var/test/test.log","rw");
                      Log_length=Log.length();
                      Log.seek(Log_length);
                      Log.writeBytes(s_mail_source+"\r\n");
                      Log.close();
                      dumpPart(m,i);
                      m.setFlag(Flags.Flag.DELETED,true);
                     
               }//for end 
            } //if end   
            java.util.Date d=new java.util.Date();
            System.out.println("\n now is "+d.toString());
            if(store.isConnected()==true)
               {
                 System.out.println("\n the inbox state is "+inbox.isOpen());
               }
            if(store.isConnected()==true)
             {
              if(inbox.isOpen()==true)
               {
                        inbox.close(true);
                        System.out.println("\n the inbox state is "+inbox.isOpen());
               }
             }
            if(store.isConnected()==true)
             {
              System.out.println("\nthe store state is "+store.isConnected());
             }
            if(store.isConnected()==true)
                  store.close();
            System.out.println("\nthe store state is "+store.isConnected());
          }catch (Exception ex) 
             {
      System.out.println("Oops, got exception! " + ex.getMessage());
      ex.printStackTrace();
     }
          System.out.println("I am sleeping now\n");                 
    }    public static void dumpPart(Part p,int i) throws Exception
     {
     //处理邮件的部分
     }
  }

Answer 3

Log=new RandomAccessFile("/var/test/test.log","rw");
                      Log_length=Log.length();
                      Log.seek(Log_length);
                      
这里最好扑捉io异常，可能是这里出现异常，而程序终止。