Java IO readLine

Hi, I've got a problemm
I'm currently trying to implement a small client/server application (well the client side of it)
the server sends few commands, but at the moment each command+data doesn't end with a new line symbol (at the moment end of each 'packet' symbolised my '$' character)
I'd love to modify the server, but i do not have the acess to the sources.
Is there any way i can write an inplementation that will break data recived into pieces in the same way that data would ahve been brocken down based on new line symbol, but instead use '$'?
Any help will be greatly appreciated, (i know this should be pretty simple but i'm new to this)
Cheers, Nick

Hi,
readLine stop reading line when encounter an end of line symbol.
So you can put instead of your "$" the character "\n" (eventually "\0").
In this manner you read from the stream with readLine.
If your problem is to change "$" character into some other character in the stream, let read the tutorial about the Stream (http://java.sun.com/docs/books/tutorial/essential/io/datasinks.html)
Bye, Anteo.

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          return xslfileLocation;
}I need to do the following:
1. Create an adapter class and a facade class that allows Client A through the use of Organization's A interface to to use Organization B's services.
2. Validate the Source XML against its DTD
3. Extract information regarding the XSL file from the given XMLTransformerConfig xml file
4. Apply the XSL Transformation to the source XML file to produce the target XML
5. Validate the Target XML against its DTD
Now I'm not asking for a free handout with this program completed as I really want to learn how to do a program like this, but I really don't have ANY prior java experience other than creating basic classes and methods. I don't know how to bring the whole program together in order to make it all work, so any guidance for making this work would be greatly appreciated.
I've researched over 100 links on the web and found alot of useful information on adapter patterns with java and facade patterns, as well as SAX/DOM examples for parsing xml documents and validation of the DTD, but I can't find anything that ties this all together. Your help will be saving my grade...I hope :). Thanks so much for reading this.

No one has anything to add for working on this project? I could really use some help, especially for creating the code for the adapter/facade pattern classes.

Void Methods and Value Returning Methods in Java

Hello,
I'm new here so please let me know if I overstep any of the rules or expectations. I merely want to learn more about Java Programming efficiently, and easily. I can ask and discuss these topics with my online prof, but she doesn't have much time.
So right now I'm trying to solve a problem. It's a typical college level computing problem which I've already turned in. So I'm not looking for someone to do my homework for me or something. It's just that the program didn't work. Even though I probably won't get a very good grade for it, I want to
make it work! I'm kind of slow when it comes to java so just bear with me.
The prof wanted us to write an algorithm that reads a student's name and 6 exam scores. Then it computes the average score for each student, assigns a letter grade, using a rating scale:
90 and above = A
80 - 89 = B
70 ? 79 = C
60 - 69 = D
Less then 60 ? F
We had to use a void method to determine the average score for each student, a loop inside the method to read the and sum the 6 scores but without outputting the average score. The sum and average had to be returned in and output in void main.
Then we had to use a value-returning method CalculateGrade to determine and return the grade for each student. But it can't output the grade because that must be done in void main.
Finally the class average must be output.
Our prof gave us a list of student names with their 6 scores.
Ward 100 54 98 65 35 100
Burris 89 65 87 84 15 32
Harris 54 21 55 87 70 54
Bettis 43 55 68 54 15 25
Staley 87 54 98 45 54 56
Randle 54 87 54 98 65 15
Maddox 56 14 40 50 40 50
Roth 30 40 54 78 24 19
Holmes 14 87 98 34 55 57
So all the data had to be read from a file and the results output to a file. Also we couldn't use 'global variables'. We had to use the appropriate parameters to pass values to and from methods.
Question 1: What does she mean by 'no global variables'? Maybe she means: don't use "*double test1, test2, test3, test4, test5*;"
Anyway because I'm a slow learner with Java, I end up looking for sample programs that seem to do a similar job as the problem posed. So with this program I decided to adapt a program called Comparison of Class Averages.
//Program: Comparison of Class Averages.
import java.io.*;
import java.util.*;
import java.text.DecimalFormat;
public class DataComparison
public static void main (String[] args) throws
FileNotFoundException, IOException
//Step 1
String courseId1; //course ID for group 1
String courseId2; //course ID for group 2
int numberOfCourses;
DoubleClass avg1 = new DoubleClass(); //average for a course
//in group 1
DoubleClass avg2 = new DoubleClass(); //average for a course
//in group 2
double avgGroup1; //average group 1
double avgGroup2; //average group 2
String inputGroup1;
String inputGroup2;
StringTokenizer tokenizer1 = null;
StringTokenizer tokenizer2 = null;
//Step 2 Open input and output files
BufferedReader group1 =
new BufferedReader(new FileReader("a:\\group1.txt"));
BufferedReader group2 =
new BufferedReader(new FileReader("a:\\group2.txt"));
PrintWriter outfile =
new PrintWriter(new FileWriter("a:\\student.out"));
DecimalFormat twoDecimal =
new DecimalFormat("0.00"); //Step 3
avgGroup1 = 0.0; //Step 4
avgGroup2 = 0.0; //Step 5
numberOfCourses = 0; //Step 6
//print heading: Step 7
outfile.println("Course No Group No Course Average");
inputGroup1 = group1.readLine(); //Step 8
inputGroup2 = group2.readLine(); //Step 9
while((inputGroup1 != null) &&
(inputGroup2 != null)) //Step 10
tokenizer1 = new StringTokenizer(inputGroup1);
courseId1 = tokenizer1.nextToken(); //Step 10a
tokenizer2 = new StringTokenizer(inputGroup2);
courseId2 = tokenizer2.nextToken(); //Step 10b
if(!courseId1.equals(courseId2)) //Step 10c
System.out.println("Data error: Course IDs "
+ "do not match.");
System.out.println("Program terminates.");
outfile.println("Data error: Course IDs "
+ "do not match.");
outfile.println("Program terminates.");
outfile.close();
return;
else //Step 10d
calculateAverage(group1, tokenizer1, avg1); //Step 10d.i
calculateAverage(group2, tokenizer2, avg2); //Step 10d.ii
printResult(outfile,courseId1,1,avg1); //Step 10d.iii
printResult(outfile,courseId2,2,avg2); //Step 10d.iv
avgGroup1 = avgGroup1 + avg1.getNum(); //Step 10d.v
avgGroup2 = avgGroup2 + avg2.getNum(); //Step 10d.vi
outfile.println();
numberOfCourses++; //Step 10d.vii
inputGroup1 = group1.readLine(); //Step 10e
inputGroup2 = group2.readLine(); //Step 10f
}//end while
if((inputGroup1 != null) && (inputGroup2 == null)) //Step 11a
System.out.println("Ran out of data for group 2 "
+ "before group 1.");
else //Step 11b
if((inputGroup1 == null) && (inputGroup1 != null))
System.out.println("Ran out of data for "
+ "group 1 before group 2.");
else //Step 11c
outfile.println("Avg for group 1: " +
twoDecimal.format(avgGroup1 / numberOfCourses));
outfile.println("Avg for group 2: " +
twoDecimal.format(avgGroup2 / numberOfCourses));
outfile.close(); //Step 12
public static void calculateAverage(BufferedReader inp,
StringTokenizer tok,
DoubleClass courseAvg)
throws IOException
double totalScore = 0.0;
int numberOfStudents = 0;
int score = 0;
if(!tok.hasMoreTokens())
tok = new StringTokenizer(inp.readLine());
score = Integer.parseInt(tok.nextToken());
while(score != -999)
totalScore = totalScore + score;
numberOfStudents++;
if(!tok.hasMoreTokens())
tok = new StringTokenizer(inp.readLine());
score = Integer.parseInt(tok.nextToken());
}//end while
courseAvg.setNum(totalScore / numberOfStudents);
}//end calculate Average
public static void printResult(PrintWriter outp,
String courseId,
int groupNo, DoubleClass avg)
DecimalFormat twoDecimal =
new DecimalFormat("0.00");
if(groupNo == 1)
outp.print(" " + courseId + " ");
else
outp.print(" ");
outp.println("\t" + groupNo + "\t "
+ twoDecimal.format(avg.getNum()));
So my adaptation turned out like this:
//Program: Compute individual and class averages from input file.
import java.io.*;
import java.util.*;
public class Exams
public static void main (String[] args)
throws FileNotFoundException
//Step 1
String nameId; //student name ID for list
int numberOfStudents;
DoubleClass avg = new DoubleClass(); //average for a student
//in list
double avgList; //average for list
//Step 2 Open the input and output files
Scanner group1 = new Scanner(new FileReader("c:\\list.txt"));
PrintWriter outfile = new PrintWriter("c:\\student.out");
avgList = 0.0; //Step 3
numberOfStudents = 0; //Step 5
//print heading: Step 6
outfile.println("NameID List Student Average");
calculateAverage(list, avg); //Step 7d.i
printResult(outfile,nameID, avg); //Step 7d.iii
avgList = avgList + avgList.getNum(); //Step 7d.v
outfile.println();
numberOfStudents++; //Step 7d.vii
outfile.printf("Avg for List: %.2f %n",
(avgList / numberOfStudents));
public static void calculateAverage(Scanner inp,
DoubleClass courseAvg)
double totalScore = 0.0;
int numberOfStudents = 0;
int score = 0;
score = inp.nextInt();
courseAvg.setNum(totalScore / numberOfStudents);
}//end calculate Average
public static void printResult(PrintWriter outp,
String nameId,
int groupNo, DoubleClass avg)
if (list == list)
outp.print(" " + nameId + " ");
else
outp.print(" ");
outp.printf("%9d %15.2f%n", list, avg.getNum());
I guess I was trying to find a shortcut that ended up being a long cut. Here's the algorithm I wrote.
Algorithm
1.) Initialize the variables
2.) Get the student name and his/her accompanying 6 exam scores, limiting the number of scores to 6.
3a.) Calculate score of 6 exams for each student using void method called CalculateAverage.
3b.) Use a loop inside the method to read and sum the six scores.
4.) Use value-returning method CalculateGrade to determine and return each student's grade.
5.) Output each student's grade in void main.
6.) Calculate the average score for all students
7.) Output entire class average
And now I'm trying to piece together code to match each step of the algorithm starting from scratch.
So I got the code for outputting each students grade in void:
public static void printGrade(double testScore)
System.out.print("Line 10: Your grade for "
+ "the course is ");
if (testScore >= 90)
System.out.println("A");
else if (testScore >= 80)
System.out.println("B");
else if (testScore >= 70)
System.out.println("C");
else if (testScore >= 60)
System.out.println("D");
else
System.out.println("F");
This code can read the the file with the scores:
Scanner inFile =
new Scanner(new FileReader("a:\\studentlist.txt"));
PrintWriter outFile =
new PrintWriter("a:\\avg.out");
courseGrade = inFile.nextDouble();
studentName=inFile.nextChar();
while (inFile.hasNext())
studentName= inFile.next().charAt(0);
courseGrade= inFile.nextDouble();
I'm just trying to piece this thing together. Any tips would be appreciated. I will return with more pieces to the puzzle soon. As you can tell it's all kind of disorganized, and scatterbrained. Just trying to find some simplification or distillation, or recommendations.
WR

Hello,
Thanks for your reply. So I take it you are more familiar with Object Oriented Programming more than Procedural Based Programming?
Well the teacher insisted I follow the algorithm instead of trying to adapt another program to the problem. But sometimes that approach saves time I've noticed since many of the code examples we study in Java are like 'the golden oldies'.
The student gradebook problem is repeated over and over in different forms. Maybe if I just approached the problem more linearly:
Algorithm
1.) Initialize the variables
String studentId
int numberOfStudents
DoubleClass avg = new DoubleClass(); //average for a student
double avgGroup: //average for all students2.) Get the student name and his/her accompanying 6 exam scores.
Scanner group = new Scanner(new FileReader("c:\\list.txt"));
PrintWriter outfile = new PrintWriter("c:\\student.out"));
3a.) Calculate score of 6 exams for each student using void method called CalculateAverage using a loop to read and sum the six scores. The loop must be inside the method. It does not output the average score. The sum and average must be returned and output in void main.
method calculateAverage
double totalScore //to store the sum of all the scores of each student
int numberOfExams; //to store the number of
int score; //to read and store a course score
double totalScore = 0.0
int numberOfExams = 0;
int score = 0;3b.) Use a loop inside the method to read and sum the six scores.
Using psuedocode (since the variables have been declared and initialized)
i)get the next student score
RIght here my approach of adapting another program to my new program becomes problematic
the pseudocode here is:
ii) while (score != -999):
I.) update totalScore by adding course score read in step i.
II.) increment numberOfExams by 1
III.) Get the nex student score
iii) studentAvg.setNum(totalScore / numberOfExams);
*What is the purpose of the statement while (score != -999)?*
I don't see why they picked -999? Will this loop allow me to read an endless number of student names and theri accompanying number of exams and then find the average for each student?
I'll go into the next algorithmic steps later.
4.) Use value-returning method CalculateGrade to determine and return each student's grade.
5.) Output each student's grade in void main.
6.) Calculate the average score for all students
7.) Output entire class average
Thanks ahead of time for any suggestions, tips.

AT Commands , Hyper Terminal and java

Hi,
I have following problem, i have PCMCIA Type -11 Wireless modem.its installed on my system COM4 port.
Now first problem is that when i try to connect with hyper terminal to COM4 there is no response from it .It become Idle.but when i connect with COM3 which is my Dialup modem port it works fine with all AT commands.
Now 2nd things is that same with below code i tried to send sms using AT command on COM4 its has same behaviour as it was in Hyper terminal mean no response. no Data Available event occour
Please help me in this regard and suggest me a solution.
package serialio;
import javax.comm.*;
import java.io.*;
import java.util.*;
public class SimpleWrite
 implements Runnable, SerialPortEventListener
public void run()
static Enumeration portList;
static CommPortIdentifier portId;
static String dest = "0517111930";
static String messageString = "Hello";
InputStream inputStream;
static SerialPort serialPort;
static OutputStream outputStream;
public void serialEvent(SerialPortEvent event)
 switch (event.getEventType())
 case SerialPortEvent.BI:
 case SerialPortEvent.OE:
 case SerialPortEvent.FE:
 case SerialPortEvent.PE:
 case SerialPortEvent.CD:
 case SerialPortEvent.CTS:
 case SerialPortEvent.DSR:
 case SerialPortEvent.RI:
 case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
 break;
 case SerialPortEvent.DATA_AVAILABLE:
 BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
 String line = "";
 try
 while ( (line = reader.readLine()) != null)
 System.out.println(line);
 catch (IOException e)
 System.err.println("Error while reading Port " + e);
 break;
 } //switch
public SimpleWrite(SerialPort serial)
 try
 inputStream = serial.getInputStream();
 try
 serial.addEventListener(this);
 catch (TooManyListenersException e)
 System.out.println("Exception in Adding Listener" + e);
 serial.notifyOnDataAvailable(true);
 catch (Exception ex)
 System.out.println("Exception in getting InputStream" + ex);
public static void main(String[] args)
// String line1="AT+CMGF=1\r\n";
// String line2="AT+CMGS=\""+ dest+"\"\r\n";
// String line3=messageString+"\r\n";
// String line4="\u001A";
 String line1 = "AT+CMGF=1\r\n";
 String line2 = "AT+CMGS=" + dest + "\r\n";
 String line3 = messageString + "^Z\r\n";
// String line4 = "\u001A";
 portList = CommPortIdentifier.getPortIdentifiers();
 while (portList.hasMoreElements())
 portId = (CommPortIdentifier) portList.nextElement();
 if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL)
 System.out.println("SMS Sending........");
 if ( portId.getName().equals("COM4"))
 System.out.println("SMS Sending....Port Found");
 try
 serialPort = (SerialPort) portId.open("SimpleWriteApp", 2000);
 SimpleWrite wr = new SimpleWrite(serialPort);
 catch (PortInUseException e)
 System.out.println("Port In Use " + e);
 try
 outputStream = serialPort.getOutputStream();
 catch (IOException e)
 System.out.println("Error writing to output stream " + e);
 try
 serialPort.setSerialPortParams(
 2400,
 SerialPort.DATABITS_8,
 SerialPort.STOPBITS_1,
 SerialPort.PARITY_NONE);
 catch (UnsupportedCommOperationException e)
 try
 outputStream.write(line1.getBytes());
 outputStream.write(line2.getBytes());
 outputStream.write(line3.getBytes());
 outputStream.flush();
 catch (IOException e)
 System.out.println("Error writing message " + e);
/** show text in the text window
 * @param Text text string to show on the display
public static void showText(String Text)
 System.out.println(Text);
}

* SerialWrite.java
* Created on September 10, 2008, 2:51 PM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package com.sms;
import javax.comm.*;
import java.io.*;
import java.util.*;
public class SerialWrite implements Runnable, SerialPortEventListener
static String output="";
public void run()
static Enumeration portList;
static CommPortIdentifier portId;
static String dest = "+91999999999";
static String messageString = "Hello Testing11";
InputStream inputStream;
static SerialPort serialPort;
static OutputStream outputStream;
public void serialEvent(SerialPortEvent event)
switch (event.getEventType())
case SerialPortEvent.BI:
case SerialPortEvent.OE:
case SerialPortEvent.FE:
case SerialPortEvent.PE:
case SerialPortEvent.CD:
case SerialPortEvent.CTS:
case SerialPortEvent.DSR:
case SerialPortEvent.RI:
case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
 System.out.println("Error");
break;
case SerialPortEvent.DATA_AVAILABLE:
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line = "";
try
while ( (line = reader.readLine()) != null)
if(line.equalsIgnoreCase("OK") || (line.indexOf("+CMGS") != -1))
 output=line;
 Thread.sleep(10);
catch (Exception e)
System.err.println("Error while reading Port " + e);
break;
} //switch
public SerialWrite(SerialPort serial)
try
inputStream = serial.getInputStream();
try
serial.addEventListener(this);
catch (TooManyListenersException e)
System.out.println("Exception in Adding Listener" + e);
serial.notifyOnDataAvailable(true);
catch (Exception ex)
System.out.println("Exception in getting InputStream" + ex);
public static void main(String[] args) throws Exception
 int i=0;
String line0 = "ATZ\r\n";
String line1 = "AT+CMGF=1\r\n";
String line2 = "AT+CSCA=\"+919888888\"\r\n";
//String line3 = "AT+CMGS="+"\""+ dest + "\""+"\r\n";
String line3 = "AT+CMGS="+"\""+ args[0] + "\""+"\r\n";
//String line4 = messageString;
String line4 = args[1];
 portList = CommPortIdentifier.getPortIdentifiers();
while (portList.hasMoreElements())
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL)
System.out.println("SMS Sending........");
if ( portId.getName().equals("/dev/ttyACM0"))
System.out.println("SMS Sending....Port Found");
try
serialPort = (SerialPort) portId.open("SerialTestApp", 2000);
SerialWrite wr = new SerialWrite(serialPort);
catch (PortInUseException e)
System.out.println("Port In Use " + e);
try
outputStream = serialPort.getOutputStream();
catch (IOException e)
System.out.println("Error writing to output stream " + e);
try
serialPort.setSerialPortParams(
115200,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
catch (UnsupportedCommOperationException e)
try
outputStream.write(line0.getBytes());
 Thread.sleep(10);
while(!output.equalsIgnoreCase("ok"))
 Thread.sleep(10);
 output="";
outputStream.write(line1.getBytes());
while(!output.equalsIgnoreCase("ok"))
 Thread.sleep(10);
 output="";
outputStream.write(line2.getBytes());
while(!output.equalsIgnoreCase("ok"))
 Thread.sleep(10);
 output="";
 for(i=0;i<3;i++)
outputStream.write(line3.getBytes());
Thread.sleep(10);
outputStream.write(line4.getBytes());
Thread.sleep(10);
outputStream.write(26);
outputStream.write("\r\n".getBytes());
outputStream.flush();
while(!output.equalsIgnoreCase("ok"))
 Thread.sleep(10);
 output="";
 System.out.println("Message Sent !!!!!!!!!1");
catch (IOException e)
System.out.println("Error writing message " + e);
/** show text in the text window
* @param Text text string to show on the display
public static void showText(String Text)
System.out.println("TEXT "+Text);
}

Sending email using SMTP and Java

Hi guys
I am using the following code to send an email:
private void sendEmail(String mDate, String time) {
 Date date = new Date();
 DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.FULL, Locale.ENGLISH);
 // Open port to server
 try {
 smtpSocket = new Socket(SMTP_SERVER, SMTP_PORT);
 os = new DataOutputStream(smtpSocket.getOutputStream());
 is = new DataInputStream(smtpSocket.getInputStream());
 // Connection was made. Socket is ready for use.
 if(smtpSocket != null && os != null && is != null) {
 try {
 // email header
 os.writeBytes("HELO\r\n");
 // set the reply email address
 os.writeBytes("MAIL From: <[email protected]>\r\n");
 // give the address of the people that we want the email sent to
 for(int i=0; i<RECIPIENTS.length; i++) {
 os.writeBytes("RCPT To: <" + RECIPIENTS[i] + ">\r\n");
 System.out.println(RECIPIENTS);
// data header
os.writeBytes("DATA\r\n");
os.writeBytes("X-Mailer: Via Java\r\n");
os.writeBytes("DATE: " + dateFormat.format(date) + "\r\n");
os.writeBytes("From: Characterisation System Update\r\n");
os.writeBytes("Mime-Version: 1.0\r\n");
os.writeBytes("Content-Type: text/html; charset=\"ISO-8859-1\"\r\n");
//os.writeBytes("Content-Transfer-Encoding: 7bit;\r\n");
for(int i=0; i<RECIPIENTS.length; i++) {
os.writeBytes("To: <" + RECIPIENTS[i] + ">\r\n");
// get the details of the test and enter them into the message body
String message = "<HTML><BODY>" +
"\r\nThe following System has not received a data packet for at leat 1 hour:" +
"\r\n System: " + rackName +
"\r\n Time Last Pkt. Received: " + time +
"\r\n Date Last Pkt. Received: " + mDate +
"\r\n Job Number: " + jobNoDispLabel.getText() +
"\r\n Device: " + deviceDispLabel.getText() +
"\r\n Run Number: " + runNoDispLabel.getText() +
"\r\n Current Temperature: " + tempDispLabel.getText() +
"\r\n Current Module: " + moduleDispLabel.getText() +
"\r\n Current Test: " + testingDispLabel.getText() +
"\r\n This does not gurantee that the system has crashed!" +
"\r\n</BODY></HTML>";
os.writeBytes("Subject: " + rackName + " Packet Warning\r\n");
os.writeBytes(message + "\r\n");
os.writeBytes("\r\n.\r\n");
os.writeBytes("QUIT\r\n");
// Now send the email off and check the server reply.
// Was an OK is reached you are complete.
String responseline;
//DataInputStream d = new DataInputStream(is);
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
while((responseline = reader.readLine())!= null) {
if(responseline.indexOf("Ok") != -1) {
break;
} catch(Exception e) {
System.out.println("Cannot send email as an error occurred.");
e.printStackTrace();
catch(Exception e) {
System.out.println("Host " + SMTP_SERVER + "unknown");
e.printStackTrace();
} finally {
// close all of the data streams
try {
if(!smtpSocket.isClosed()) {
smtpSocket.close();
smtpSocket = null;
} catch(Exception e) {
e.printStackTrace();
try {
if(os != null) {
os.close();
os = null;
} catch(Exception e) {
e.printStackTrace();
try {
if(is != null) {
is.close();
is = null;
} catch(Exception e) {
e.printStackTrace();
i have used an example on the web to help me do this, so it may look familiar!!
It works fine when i run the program in debug mode but doesn't work when i run the jar file, i was wondering if anyone could help me understand why? or give me a clue as to where to look as i have had the strange realisation that i rarely compile my code up to be used by other people!!
sad but true! Also apologies if i haven't posted adequate information, this is the first time i have posted on the forum asking for help!
Anyway help would be most appreciated and thanks in advance

Sorry, by debug mode i mean running it using netbeans 5.5 and clicking on the "run main project" icon.
Once i have cleaned and built the main project all of the files are put into the jar file. Once i have done that i double click on the jar icon
is that ok? there doesn't seem to be any errors

Sending Email using java code

I am using the following code to send an email from my java servlet but the problem is, when it is on its own it works fine but as soon as I combine it with some code to submit data into a postgres database it sometimes does not perform could it be because im missing some close statements??
//grades to submit grades starts here
 String [] paramValues = req.getParameterValues("Mark");
 for(int i=0; i<paramValues.length;i++)
 String [] paramValues2 = req.getParameterValues("StudentExamNumber");
 String Mark = paramValues;
 String ExamNo = paramValues2[i];
 //testing purposes
 out.println("<tr><td>"+ExamNo+"</td>");
 out.println("<td>"+Mark+"</td>");
 try
 st = conn.createStatement();
 query = "SELECT StudentNo FROM STUDENTS"+WebCourse2+ " where ExamNo='"+ExamNo+"'";
 rs = st.executeQuery(query);
 if(rs !=null)
 while(rs.next())
 String StudentNo=rs.getString("StudentNo");
 //testing purposes
 //out.println("<td>"+StudentNo+"</td></tr>");
 here
 st4 = conn.createStatement();
 query4 = "select MAX(entryno) from STUDENTRESULTSFORCOURSE"+WebCourse2+" WHERE STUDENTNO='"+StudentNo+"'";
 rs4 = st4.executeQuery(query4);
 if(rs4 !=null)
 while(rs4.next())
 EntryNo = rs4.getInt(1);
 }//end rs4 while
 rs4.close();
 }//end rs4 if
 out.println("<tr><td>EntryNo= "+EntryNo+"</td>");
 EntryNo = EntryNo + 1;
 out.println("<td>NewEntryNo= "+EntryNo+"</td></tr>");
 //Submitting grades to database/
 st3 = conn.createStatement();
 insert = "insert into STUDENTRESULTSFORCOURSE"+WebCourse2+" (StudentNo, CourseCode, AttemptNo, ExamMark, EntryNo, EnteredBy) values ('"+StudentNo+"', '"+WebCourse2+"', 1,'"+Mark+"',"+EntryNo+",'"+WebUsername2+"')";
 st3.executeUpdate(insert);
 }//end rs while
 rs.close();
 }//end rs if
 }//end try
 catch (SQLException e)
 System.out.println("Error: "+e.getMessage());
 }//end for loop
 //code to submit grades ends here
 //code used to send email starts here
 String m_sHostName="localhost";
 int m_iPort=25;
 try
 // Open port to server
 smtpSocket = new Socket(m_sHostName, m_iPort);
 os = new DataOutputStream(smtpSocket.getOutputStream());
 is = new DataInputStream(smtpSocket.getInputStream());
 if(smtpSocket != null && os != null && is != null)
 // Connection was made. Socket is ready for use.
 System.out.println("Connection was made. Socket is ready for use.");
 try
 // The email address that the server
 // you are using know user as.
 os.writeBytes("MAIL From: <[email protected]>\r\n");
 // Who the email is going to.
 os.writeBytes("RCPT To: <[email protected]>\r\n");
 //send a CC to:
 os.writeBytes("RCPT Cc: <[email protected]>\r\n");
 // add the message and the
 // header of the email to be sent out.
 os.writeBytes("DATA\r\n");
 os.writeBytes("X-Mailer: Via Java\r\n");
 os.writeBytes("From: "+WebUsername2+"<[email protected]>\r\n");
 os.writeBytes("To: Marie <[email protected]>\r\n");
 //Again if you want to send a CC then add this.
 os.writeBytes("Cc: ProfCuthbert <[email protected]>\r\n");
 String sMessage = "ELECTRONIC ENGINEERING EXAM COLLATION SYSTEM EMAIL\n\nThe results for the following course have been submitted by the following member of staff\n\nCOURSE: "+WebCourse2+"\n\nSUBMITTED BY: "+WebUsername2+" \n\nPLEASE LOCK COURSE NOW IN ORDER TO PREVENT ANY FURTHER SUBMISSIONS TO BE MADE BY USERS.";
 os.writeBytes("Subject: A SUBMISSION HAS BEEN MADE FOR COURSE "+WebCourse2+"\r\n");
 os.writeBytes(sMessage + "\r\n");
 os.writeBytes("\r\n.\r\n");
 os.writeBytes("QUIT\r\n");
 // Now send the email off and check the server reply.
 // Once an OK is reached you are complete.
 String responseline;
 //for testing purposes
 //out.println(responseline = is.readLine());
 while((responseline = is.readLine())!=null)
 //for testing purposes
 //out.println("responseline= "+responseline+" ");
 //out.println("responseline.indexOf(Ok)= "+responseline.indexOf("Ok"));
 if(responseline.indexOf("Ok") != -1)
 break;
 if(responseline.indexOf("Ok") == -1)
 confirm=1;
 if (confirm==1)
 out.println(" the marks have been submitted thank you");
 catch(Exception e)
 { System.out.println("Cannot send email as an error occurred.");
 out.println("Cannot send email as an error occurred.");
 catch(Exception e)
 { System.out.println("Host " + m_sHostName + "unknown"); }
Does anyone know what the problem is??
thanks
tzaf

i close them later in the program. Ive made sure they are all closed I have a feeling that it could be coming from here....
//code used to send email starts here
 String m_sHostName="localhost";
 int m_iPort=25;
 try
 // Open port to server
 smtpSocket = new Socket(m_sHostName, m_iPort);
 os = new DataOutputStream(smtpSocket.getOutputStream());
 is = new DataInputStream(smtpSocket.getInputStream());
 if(smtpSocket != null && os != null && is != null)
 // Connection was made. Socket is ready for use.
 System.out.println("Connection was made. Socket is ready for use.");
 try
 // The email address that the server
 // you are using know user as.
 os.writeBytes("MAIL From: <email address>\r\n");
 // Who the email is going to.
 os.writeBytes("RCPT To: <email address>\r\n");
 //send a CC to:
 os.writeBytes("RCPT Cc: <email address>\r\n");
 // add the message and the
 // header of the email to be sent out.
 os.writeBytes("DATA\r\n");
 os.writeBytes("X-Mailer: Via Java\r\n");
 os.writeBytes("From: "+WebUsername2+"<email address>\r\n");
 os.writeBytes("To: hello<email address>\r\n");
 //Again if you want to send a CC then add this.
 os.writeBytes("Cc: hello <email address>\r\n");
 String sMessage = "ELECTRONIC ENGINEERING EXAM COLLATION SYSTEM EMAIL\n\nThe results for the following course have been submitted by the following member of staff\n\nCOURSE: "+WebCourse2+"\n\nSUBMITTED BY: "+WebUsername2+" \n\nPLEASE LOCK COURSE NOW IN ORDER TO PREVENT ANY FURTHER SUBMISSIONS TO BE MADE BY USERS.";
 os.writeBytes("Subject: A SUBMISSION HAS BEEN MADE FOR COURSE "+WebCourse2+"\r\n");
 os.writeBytes(sMessage + "\r\n");
 os.writeBytes("\r\n.\r\n");
 os.writeBytes("QUIT\r\n");
 // Now send the email off and check the server reply.
 // Once an OK is reached you are complete.
 String responseline;
 //for testing purposes
 //out.println(responseline = is.readLine());
 while((responseline = is.readLine())!=null)
 //for testing purposes
 //out.println("responseline= "+responseline+" ");
 //out.println("responseline.indexOf(Ok)= "+responseline.indexOf("Ok"));
 if(responseline.indexOf("Ok") != -1)
 break;
 if(responseline.indexOf("Ok") == -1)
 confirm=1;
 if (confirm==1)
 out.println(" the marks have been submitted thank you");
 catch(Exception e)
 { System.out.println("Cannot send email as an error occurred.");
 out.println("Cannot send email as an error occurred.");
 catch(Exception e)
 { System.out.println("Host " + m_sHostName + "unknown"); }
 //code used to send email ends here
do i need to close is and os?
thanks
tzaf

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