Read an Excel file in java
Greetings all
I am not a java pro but have to develop a software for my company init. i need to read data from an excel file. I couldnt find proper help on the internet so thought about dropping a message here in java guru forum. i'll be obliged if somone could help me. thanks alot.
mrityunjoy wrote:
ejp wrote:
you don't need to write ugly text file parsing codeParsing code isn't 'ugly' unless you don't know how to write it.I agree. However, in general people write lot of conditional statements and loops to handle different scenarios while processing text files.
what if the delimiter itself is part of your data?The answer to that is already defined in the CSV format.Agreed, but the complications (I gave one example only) you need to tackle unless you copy or use some existing CSV file parsing code. Moreover, why to bother so much when you have a free and open source sophisticated API.
I can think of a few reasons. At least with POI (not sure WRT to JExcel, but my guess is that this is still a valid statement), you have to build the document in memory. It is only written once all the various components have been specified in memory and then flushed to a stream. Therefore, large workbooks are problematic.
With a CSV, I have no such issues whatsoever. I can process row-by-row with very little memory overhead. For an application, say, generating reports via Excel, this can be a nontrivial issue.
I never said the approach: excel >> CSV >> process text is not a good option.
Thanks,
Mrityunjoy- Saish
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Flippen nothing.
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import java.io.*;
import java.sql.*;
import java.util.*;
public class ExcelReadTest1{
public static void main(String[] args){
Connection connection = null;
try{
//Vector vector = new Vector();
String myString="";
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System.err.print("Exception: ");
System.err.println(ex.getMessage());I took your code and reworked it to access a little database I keep of students at a small private school where my wife works. The Student table has columns "studentID", "firstname", "lastname", and "gradyear".
Running your code for the output got the following. I cut and pasted the output after it had run through the first 4 students, so you can see what it's doing.
Row 1 : 1
1
Row 1 : 1 : Audrey
, Audrey
Row 1 : 1 : Audrey : Budington
, Budington
Row 1 : 1 : Audrey : Budington : 2015
, 2015
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2
2
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia
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Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo
, DeRigo
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
, 2015
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3
3
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena
, Serena
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes
, Downes
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
, 2015
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4
4
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4 : Dylan
, Dylan
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4 : Dylan : Gellert
, Gellert
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4 : Dylan : Gellert : 2015
, 2015
You need to figure out the flow of the thing and your println() calls and your looping. Eventually if you straighten it out you will get something like
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4 : Dylan : Gellert : 2015
Row 5 : 5 : Benjamin : Miller : 2015
Row 6 : 6 : Timothy : Bolan : 2014
Row 7 : 7 : Javin : deMello-Folsom : 2014
Row 8 : 8 : Elizabeth : Eppolito : 2014
Row 9 : 9 : Harrison : Evans : 2014
Row 10 : 10 : Emily : Fay : 2014
*** etc***
which is what you want, isn't it? -
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Respected sir/madam
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This is the code what i have written
import java.io.*;
import java.sql.*;
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java.sql.SQLException: [Microsoft][ODBC Excel Driver] The Microsoft Jet database engine could not find the object 'abadata'. Make sure the object exists and that you spell its name and the path name correctly.
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String query = "Select * from [Sheet1$]" ;
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catch( Exception e )
System.err.println( e );
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Hi Developers,
I'm trying to retrieve data from a read-only Excel file. I used the same code that I used to retrieve data from a normal Excel file, but it can't work.
My code is as followed:
try
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HSSFWorkbook Kpwb = new HSSFWorkbook(KpExcel);
HSSFSheet Kpsheet = Kpwb.getSheetAt(0);
catch(Exception e)
e.printStackTrace();
System.out.println("Exception: "+e.getMessage());
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java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at org.apache.poi.hssf.record.RecordFactory.createRecord(RecordFactory.java:224)
at org.apache.poi.hssf.record.RecordFactory.createRecords(RecordFactory.java:160)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:163)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:210)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:191)
at photoproductionsystem.IncomingWIPPanel.getKp(IncomingWIPPanel.java:118)
at photoproductionsystem.IncomingWIPPanel.<init>(IncomingWIPPanel.java:76)
at photoproductionsystem.TabbedDisplay.<init>(TabbedDisplay.java:47)
at photoproductionsystem.Display.create(Display.java:73)
at photoproductionsystem.Display.init(Display.java:44)
at photoproductionsystem.Display.main(Display.java:229)
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at java.lang.System.arraycopy(Native Method)
at org.apache.poi.hssf.record.UnknownRecord.<init>(UnknownRecord.java:62)
at org.apache.poi.hssf.record.SubRecord.createSubRecord(SubRecord.java:57)
at org.apache.poi.hssf.record.ObjRecord.fillFields(ObjRecord.java:99)
at org.apache.poi.hssf.record.Record.fillFields(Record.java:90)
at org.apache.poi.hssf.record.Record.<init>(Record.java:55)
at org.apache.poi.hssf.record.ObjRecord.<init>(ObjRecord.java:61)
... 15 more
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how do I ask at Apache mailing list?I wonder why it seems to be a strange idea to some people to look at the software vendor's site for product support. :p
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Getting an Error after reading a excel file
hi
I am reading a excel file using POI
my code is
package businessLogic;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.hssf.eventusermodel.HSSFEventFactory;
import org.apache.poi.hssf.eventusermodel.HSSFListener;
import org.apache.poi.hssf.eventusermodel.HSSFRequest;
import org.apache.poi.hssf.record.BOFRecord;
import org.apache.poi.hssf.record.BoundSheetRecord;
import org.apache.poi.hssf.record.LabelSSTRecord;
import org.apache.poi.hssf.record.NumberRecord;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.hssf.record.RowRecord;
import org.apache.poi.hssf.record.SSTRecord;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
* This example shows how to use the event API for reading a file.
public class EventExample implements HSSFListener
private SSTRecord sstrec;
* This method listens for incoming records and handles them as required.
* @param record The record that was found while reading.
public void processRecord(Record record)
try
switch (record.getSid())
// the BOFRecord can represent either the beginning of a sheet or the workbook
case BOFRecord.sid:
BOFRecord bof = (BOFRecord) record;
if (bof.getType() == bof.TYPE_WORKBOOK)
System.out.println("Encountered workbook");
// assigned to the class level member
} else if (bof.getType() == bof.TYPE_WORKSHEET)
System.out.println("Encountered sheet reference");
break;
case BoundSheetRecord.sid:
BoundSheetRecord bsr = (BoundSheetRecord) record;
System.out.println("New sheet named: " + bsr.getSheetname());
break;
case RowRecord.sid:
RowRecord rowrec = (RowRecord) record;
System.out.println("Row found, first column at " + rowrec.getFirstCol() + " last column at " + rowrec.getLastCol());
break;
case NumberRecord.sid:
NumberRecord numrec = (NumberRecord) record;
System.out.println("Cell found with value " + numrec.getValue()+ " at row " + numrec.getRow() + " and column " + numrec.getColumn());
break;
// SSTRecords store a array of unique strings used in Excel.
case SSTRecord.sid:
sstrec = (SSTRecord) record;
for (int k = 0; k < sstrec.getNumUniqueStrings(); k++)
System.out.println("String table value " + k + " = " + sstrec.getString(k));
break;
case LabelSSTRecord.sid:
LabelSSTRecord lrec = (LabelSSTRecord) record;
System.out.println("String cell found with value " + sstrec.getString(lrec.getSSTIndex()));
break;
catch(Exception ex)
* Read an excel file and spit out what we find.
* @param args Expect one argument that is the file to read.
* @throws IOException When there is an error processing the file.
public static void main(String[] args) throws IOException
// create a new file input stream with the input file specified
// at the command line
try
FileInputStream fin = new FileInputStream("C:/FTERPending/FTER format.xls");
// create a new org.apache.poi.poifs.filesystem.Filesystem
POIFSFileSystem poifs = new POIFSFileSystem(fin);
// get the Workbook (excel part) stream in a InputStream
InputStream din = poifs.createDocumentInputStream("Workbook");
// construct out HSSFRequest object
HSSFRequest req = new HSSFRequest();
// lazy listen for ALL records with the listener shown above
req.addListenerForAllRecords(new EventExample());
// create our event factory
HSSFEventFactory factory = new HSSFEventFactory();
// process our events based on the document input stream
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fin.close();
// and our document input stream (don't want to leak these!)
din.close();
System.out.println("done.");
catch(Exception ex)
It prints correctly the output at the console and after that it throws an exception as
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.apache.poi.hssf.record.RecordFactory.createRecord(RecordFactory.java:224)
at org.apache.poi.hssf.eventusermodel.HSSFEventFactory.genericProcessEvents(HSSFEventFactory.java:183)
at org.apache.poi.hssf.eventusermodel.HSSFEventFactory.processEvents(HSSFEventFactory.java:101)
at businessLogic.EventExample.main(EventExample.java:103)
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at java.lang.System.arraycopy(Native Method)
at org.apache.poi.hssf.record.UnknownRecord.<init>(UnknownRecord.java:62)
at org.apache.poi.hssf.record.SubRecord.createSubRecord(SubRecord.java:57)
at org.apache.poi.hssf.record.ObjRecord.fillFields(ObjRecord.java:99)
at org.apache.poi.hssf.record.Record.fillFields(Record.java:90)
at org.apache.poi.hssf.record.Record.<init>(Record.java:55)
at org.apache.poi.hssf.record.ObjRecord.<init>(ObjRecord.java:61)
... 8 more
I am not getting why this exception is cming
can anyone help me pls replyDoes your Excel file has the "AutoFilter" activated?
If that is the problem, you have here a solution for reading a file with AutoFilter : http://article.gmane.org/gmane.comp.jakarta.poi.user/4690 -
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ID NAME SALARY STREET
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try
String[] allFields;
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Could anyone help me?
Thank you in advance!:)
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import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Cell;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
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@SuppressWarnings({ "unchecked", "unchecked" })
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List sheetData = new ArrayList();
FileInputStream fis = null;
try {
fis = new FileInputStream(filename);
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HSSFSheet sheet = workbook.getSheetAt(0);
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while (rows.hasNext()) {
HSSFRow row = (HSSFRow) rows.next();
Iterator cells = row.cellIterator();
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while (cells.hasNext()) {
HSSFCell cell = (HSSFCell) cells.next();
data.add(cell);
sheetData.add(data);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fis != null) {
fis.close();
showExcelData(sheetData);
@SuppressWarnings("unused")
HashMap<String, String> tableFields = new HashMap();
for (int i=0; i<sheetData.size();i++){
List list = (List) sheetData.get(i);
for (int j=0; j<list.size(); j++){
Cell cell = (Cell) list.get(j);
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
System.out.print(cell.getNumericCellValue());
}else if(cell.getCellType()==Cell.CELL_TYPE_STRING) {
System.out.print(cell.getRichStringCellValue());
} else if(cell.getCellType()==Cell.CELL_TYPE_BOOLEAN) {
System.out.print(cell.getBooleanCellValue());
if (j < list.size() - 1) {
System.out.print(", ");
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@SuppressWarnings("unchecked")
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List list = (List) sheetData.get(0);
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tableFields.put(cell.getStringCellValue(),cell.getCellType());
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str=fieldName + "INTEGER";
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System.out.println( "SQLException: " + e.getMessage() );
System.out.println( "SQLState: " + e.getSQLState() );
System.out.println( "VendorError: " + e.getErrorCode() );
try
String[] allFields;
String createTableStr = "CREATE TABLE" + createTableStr
+ "(" + org.apache.commons.lang3.StringUtils.join(allFields,
*",") + ")";*
System.out.println( "Create a new table in the database" );
stmt.executeUpdate( createTableStr );
catch( SQLException e )
System.out.println( "SQLException: " + e.getMessage() );
System.out.println( "SQLState: " + e.getSQLState() );
System.out.println( "VendorError: " + e.getErrorCode() );
catch( Exception e )
System.out.println( ((SQLException) e).getSQLState() );
System.out.println( e.getMessage() );
e.printStackTrace();
return null;
}Please don't multipost! Also crossposted: http://www.java-forums.org/jdbc/71612-store-data-mysql-after-reading-excel-files.html
Mod: I'm locking this thread. -
How to save html as Excel file im java
Hi to all
How can i save html file as Excel file in Java
If any solutions plz help MeThanks for ur reply
Source URL is::http://www.sttpc.com/reseller/price.htm
Target is to save table data into Excel Sheet.
Upto saving that file as Excel file its working (using I/O).
When iam trying to read excel sheet data then iam getting OLE Exception.
plz suggest me other Alternate solutions to overcome this problem.
I tried htmlparser from sourceforge.net i got partial ouput.But i want dynamic solution.
Thanks. -
How to compare two excel files in java ?
how do i compare two excel files in java.?
I have two excel files stored on my computer in d: drive.
Ex:
D:\\file a
D:\\file b
How to compare the contents of these two files and print " files are equal " or "files not equal "Javamastermahe wrote:
I mean i want to print on the console "files are equal " or any message like " both the files match "If this is your requirement, this program satisfies it...
import java.util.Random;
public class SuperExcelTester {
public static void main(String[] args) {
Random rnd = new Random();
String[] messages = {
"files are equal",
"files are not equal",
"unexpected error"
int index = rnd.nextInt(messages.length);
System.out.println(messages[index]);
} -
How do I produce an excel file using java code
How do i produce an excel file using java code.
If it is possible would ne one have ne source code as an example.
I have tried looking up information on outputing the information to a *.csv file but unfortunality i have had no luck in finding any information. To be exact ne source code.
Thanks
LeeThat's what I use and I'd be the first to admit that it's very messy. But it works. Go use Google and see what else you can find.
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