Javaから3列N行のExcelファイルを読み書きして、各セルに1つの文字列を出力します。誰かが私にこれのための簡単なコードスニペットを与えることができますか?外部のライブラリを使用する必要がありますか、それともJavaに組み込みのサポートがありますか?
私は以下のことをやりたいのです。
for(i=0; i <rows; i++)
//read [i,col1] ,[i,col2], [i,col3]
for(i=0; i<rows; i++)
//write [i,col1], [i,col2], [i,col3]
Apache POI HSSF を試してください。これがExcelファイルの読み方の例です。
try {
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(file));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row;
HSSFCell cell;
int rows; // No of rows
rows = sheet.getPhysicalNumberOfRows();
int cols = 0; // No of columns
int tmp = 0;
// This trick ensures that we get the data properly even if it doesn't start from first few rows
for(int i = 0; i < 10 || i < rows; i++) {
row = sheet.getRow(i);
if(row != null) {
tmp = sheet.getRow(i).getPhysicalNumberOfCells();
if(tmp > cols) cols = tmp;
}
}
for(int r = 0; r < rows; r++) {
row = sheet.getRow(r);
if(row != null) {
for(int c = 0; c < cols; c++) {
cell = row.getCell((short)c);
if(cell != null) {
// Your code here
}
}
}
}
} catch(Exception ioe) {
ioe.printStackTrace();
}
ドキュメントページには、Excelファイルへの書き込み方法の例もあります。
Apache POI がこれを可能にします。具体的には HSSF モジュールです。 クイックガイド が最も便利です。ここにあなたが望むことをする方法があります - 具体的にはシートを作成してそれを書き出してください。
Workbook wb = new HSSFWorkbook();
//Workbook wb = new XSSFWorkbook();
CreationHelper createHelper = wb.getCreationHelper();
Sheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
Row row = sheet.createRow((short)0);
// Create a cell and put a value in it.
Cell cell = row.createCell(0);
cell.setCellValue(1);
// Or do it on one line.
row.createCell(1).setCellValue(1.2);
row.createCell(2).setCellValue(
createHelper.createRichTextString("This is a string"));
row.createCell(3).setCellValue(true);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
まず、プロジェクトクラスパスにこれらすべてのjarファイルを追加します。
Excelファイルに書き込むためのコード:
public static void main(String[] args) {
//Blank workbook
XSSFWorkbook workbook = new XSSFWorkbook();
//Create a blank sheet
XSSFSheet sheet = workbook.createSheet("Employee Data");
//This data needs to be written (Object[])
Map<String, Object[]> data = new TreeMap<String, Object[]>();
data.put("1", new Object[]{"ID", "NAME", "LASTNAME"});
data.put("2", new Object[]{1, "Amit", "Shukla"});
data.put("3", new Object[]{2, "Lokesh", "Gupta"});
data.put("4", new Object[]{3, "John", "Adwards"});
data.put("5", new Object[]{4, "Brian", "Schultz"});
//Iterate over data and write to sheet
Set<String> keyset = data.keySet();
int rownum = 0;
for (String key : keyset)
{
//create a row of excelsheet
Row row = sheet.createRow(rownum++);
//get object array of prerticuler key
Object[] objArr = data.get(key);
int cellnum = 0;
for (Object obj : objArr)
{
Cell cell = row.createCell(cellnum++);
if (obj instanceof String)
{
cell.setCellValue((String) obj);
}
else if (obj instanceof Integer)
{
cell.setCellValue((Integer) obj);
}
}
}
try
{
//Write the workbook in file system
FileOutputStream out = new FileOutputStream(new File("C:\\Documents and Settings\\admin\\Desktop\\imp data\\howtodoinjava_demo.xlsx"));
workbook.write(out);
out.close();
System.out.println("howtodoinjava_demo.xlsx written successfully on disk.");
}
catch (Exception e)
{
e.printStackTrace();
}
}
Excelファイルから読み込むためのコード
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
public static void main(String[] args) {
try {
FileInputStream file = new FileInputStream(new File("C:\\Documents and Settings\\admin\\Desktop\\imp data\\howtodoinjava_demo.xlsx"));
//Create Workbook instance holding reference to .xlsx file
XSSFWorkbook workbook = new XSSFWorkbook(file);
//Get first/desired sheet from the workbook
XSSFSheet sheet = workbook.getSheetAt(0);
//Iterate through each rows one by one
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext())
{
Row row = rowIterator.next();
//For each row, iterate through all the columns
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext())
{
Cell cell = cellIterator.next();
//Check the cell type and format accordingly
switch (cell.getCellType())
{
case Cell.CELL_TYPE_NUMERIC:
System.out.print(cell.getNumericCellValue() + "\t");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "\t");
break;
}
}
System.out.println("");
}
file.close();
} catch (Exception e) {
e.printStackTrace();
}
}
新しい簡単でとてもクールなツールがあります(10倍のKfir): xcelite
書く:
public class User {
@Column (name="Firstname")
private String firstName;
@Column (name="Lastname")
private String lastName;
@Column
private long id;
@Column
private Date birthDate;
}
Xcelite xcelite = new Xcelite();
XceliteSheet sheet = xcelite.createSheet("users");
SheetWriter<User> writer = sheet.getBeanWriter(User.class);
List<User> users = new ArrayList<User>();
// ...fill up users
writer.write(users);
xcelite.write(new File("users_doc.xlsx"));
読む:
Xcelite xcelite = new Xcelite(new File("users_doc.xlsx"));
XceliteSheet sheet = xcelite.getSheet("users");
SheetReader<User> reader = sheet.getBeanReader(User.class);
Collection<User> users = reader.read();
Xlsxファイルを読むには、 Apache POI libsを使うことができます。
public static void readXLSXFile() throws IOException
{
InputStream ExcelFileToRead = new FileInputStream("C:/Test.xlsx");
XSSFWorkbook wb = new XSSFWorkbook(ExcelFileToRead);
XSSFWorkbook test = new XSSFWorkbook();
XSSFSheet sheet = wb.getSheetAt(0);
XSSFRow row;
XSSFCell cell;
Iterator rows = sheet.rowIterator();
while (rows.hasNext())
{
row=(XSSFRow) rows.next();
Iterator cells = row.cellIterator();
while (cells.hasNext())
{
cell=(XSSFCell) cells.next();
if (cell.getCellType() == XSSFCell.CELL_TYPE_STRING)
{
System.out.print(cell.getStringCellValue()+" ");
}
else if(cell.getCellType() == XSSFCell.CELL_TYPE_NUMERIC)
{
System.out.print(cell.getNumericCellValue()+" ");
}
else
{
//U Can Handel Boolean, Formula, Errors
}
}
System.out.println();
}
}
.csvかPOIは確かにそれをするでしょう、しかしあなたはAndy Khanの JExcel を知っているべきです。私はそれがExcelを扱うためのはるかに最高のJavaライブラリだと思います。
String path="C:\\Book2.xlsx";
try {
File f = new File( path );
Workbook wb = WorkbookFactory.create(f);
Sheet mySheet = wb.getSheetAt(0);
Iterator<Row> rowIter = mySheet.rowIterator();
for ( Iterator<Row> rowIterator = mySheet.rowIterator() ;rowIterator.hasNext(); )
{
for ( Iterator<Cell> cellIterator = ((Row)rowIterator.next()).cellIterator() ; cellIterator.hasNext() ; )
{
System.out.println ( ( (Cell)cellIterator.next() ).toString() );
}
System.out.println( " **************************************************************** ");
}
} catch ( Exception e )
{
System.out.println( "exception" );
e.printStackTrace();
}
プロジェクトにjar poiとpoi-ooxml(org.Apache.poi)を追加したことを確認してください。
単純なCSVファイルで十分です
確かに、あなたは以下のコードが便利で読み書きしやすいと思うでしょう。これはあなたのメインメソッドで使うことができるutil
クラスであり、それからあなたは以下のすべてのメソッドを使うのが良いです。
public class ExcelUtils {
private static XSSFSheet ExcelWSheet;
private static XSSFWorkbook ExcelWBook;
private static XSSFCell Cell;
private static XSSFRow Row;
File fileName = new File("C:\\Users\\satekuma\\Pro\\Fund.xlsx");
public void setExcelFile(File Path, String SheetName) throws Exception
try {
FileInputStream ExcelFile = new FileInputStream(Path);
ExcelWBook = new XSSFWorkbook(ExcelFile);
ExcelWSheet = ExcelWBook.getSheet(SheetName);
} catch (Exception e) {
throw (e);
}
}
public static String getCellData(int RowNum, int ColNum) throws Exception {
try {
Cell = ExcelWSheet.getRow(RowNum).getCell(ColNum);
String CellData = Cell.getStringCellValue();
return CellData;
} catch (Exception e) {
return "";
}
}
public static void setCellData(String Result, int RowNum, int ColNum, File Path) throws Exception {
try {
Row = ExcelWSheet.createRow(RowNum - 1);
Cell = Row.createCell(ColNum - 1);
Cell.setCellValue(Result);
FileOutputStream fileOut = new FileOutputStream(Path);
ExcelWBook.write(fileOut);
fileOut.flush();
fileOut.close();
} catch (Exception e) {
throw (e);
}
}
}
.xlsxワークブックからデータを読み取るためには、XSSFworkbookクラスを使用する必要があります。
XSSFWorkbook xlsxBook = new XSSFWorkbook(fis);
XSSFSheet sheet = xlsxBook.getSheetAt(0);
など.
Apache-poi 3.9 @ http://poi.Apache.org/ を使う必要があります
例の訪問と詳細情報については: http://Java-recent.blogspot.in
春のApache poiリポジトリを使う
if (fileName.endsWith(".xls")) {
File myFile = new File("file location" + fileName);
FileInputStream fis = new FileInputStream(myFile);
org.Apache.poi.ss.usermodel.Workbook workbook = null;
try {
workbook = WorkbookFactory.create(fis);
} catch (InvalidFormatException e) {
e.printStackTrace();
}
org.Apache.poi.ss.usermodel.Sheet sheet = workbook.getSheetAt(0);
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()) {
Row row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN:
System.out.print(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_NUMERIC:
System.out.print(cell.getNumericCellValue());
break;
}
System.out.print(" - ");
}
System.out.println();
}
}
列番号が変化している場合はこれを使用することができます
package com.org.tests;
import org.Apache.poi.xssf.usermodel.*;
import Java.io.FileInputStream;
import Java.io.IOException;
public class ExcelSimpleTest
{
String path;
public FileInputStream fis = null;
private XSSFWorkbook workbook = null;
private XSSFSheet sheet = null;
private XSSFRow row =null;
private XSSFCell cell = null;
public ExcelSimpleTest() throws IOException
{
path = System.getProperty("user.dir")+"\\resources\\Book1.xlsx";
fis = new FileInputStream(path);
workbook = new XSSFWorkbook(fis);
sheet = workbook.getSheetAt(0);
}
public void ExelWorks()
{
int index = workbook.getSheetIndex("Sheet1");
sheet = workbook.getSheetAt(index);
int rownumber=sheet.getLastRowNum()+1;
for (int i=1; i<rownumber; i++ )
{
row = sheet.getRow(i);
int colnumber = row.getLastCellNum();
for (int j=0; j<colnumber; j++ )
{
cell = row.getCell(j);
System.out.println(cell.getStringCellValue());
}
}
}
public static void main(String[] args) throws IOException
{
ExcelSimpleTest excelwork = new ExcelSimpleTest();
excelwork.ExelWorks();
}
}
対応するmavendependencyはここで見つけることができます
私はそれが完全にではなく空白の列や行を数えていなかったので、私はそれをテストし、今Excelファイルの任意の部分の任意のセルを取得することができます。また、uは塗りつぶされた列の間に空白の列を持つことができ、それはそれらを読むでしょう
try {
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(Dir));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row;
HSSFCell cell;
int rows; // No of rows
rows = sheet.getPhysicalNumberOfRows();
int cols = 0; // No of columns
int tmp = 0;
int cblacks=0;
// This trick ensures that we get the data properly even if it doesn't start from first few rows
for(int i = 0; i <= 10 || i <= rows; i++) {
row = sheet.getRow(i);
if(row != null) {
tmp = sheet.getRow(i).getPhysicalNumberOfCells();
if(tmp >= cols) cols = tmp;else{rows++;cblacks++;}
}
cols++;
}
cols=cols+cblacks;
for(int r = 0; r < rows; r++) {
row = sheet.getRow(r);
if(row != null) {
for(int c = 0; c < cols; c++) {
cell = row.getCell(c);
if(cell != null) {
System.out.print(cell+"\n");//Your Code here
}
}
}
}} catch(Exception ioe) {
ioe.printStackTrace();}
Excelファイルを読み書きするもう1つの方法は、 Windmill を使用することです。それはExcelとCSVファイルを処理するための流暢なAPIを提供します。
try (Stream<Row> rowStream = Windmill.parse(FileSource.of(new FileInputStream("myFile.xlsx")))) {
rowStream
// skip the header row that contains the column names
.skip(1)
.forEach(row -> {
System.out.println(
"row n°" + row.rowIndex()
+ " column 'User login' value : " + row.cell("User login").asString()
+ " column n°3 number value : " + row.cell(2).asDouble().value() // index is zero-based
);
});
}
Windmill
.export(Arrays.asList(bean1, bean2, bean3))
.withHeaderMapping(
new ExportHeaderMapping<Bean>()
.add("Name", Bean::getName)
.add("User login", bean -> bean.getUser().getLogin())
)
.asExcel()
.writeTo(new FileOutputStream("Export.xlsx"));
あなたはApache POIライブラリを必要としており、以下のこのコードはあなたを助けるでしょう
import Java.io.File;
import Java.io.FileInputStream;
import Java.io.FileNotFoundException;
import Java.io.FileOutputStream;
import Java.io.IOException;
import Java.util.ArrayList;
import Java.util.List;
import Java.util.Iterator;
//*************************************************************
import org.Apache.poi.ss.usermodel.Sheet;
import org.Apache.poi.ss.usermodel.Cell;
import org.Apache.poi.ss.usermodel.Row;
import org.Apache.poi.ss.usermodel.Workbook;
import org.Apache.poi.xssf.usermodel.XSSFSheet;
import org.Apache.poi.xssf.usermodel.XSSFWorkbook;
//*************************************************************
public class AdvUse {
private static Workbook wb ;
private static Sheet sh ;
private static FileInputStream fis ;
private static FileOutputStream fos ;
private static Row row ;
private static Cell cell ;
private static String ExcelPath ;
//*************************************************************
public static void setEcxelFile(String ExcelPath, String SheetName) throws Exception {
try {
File f= new File(ExcelPath);
if(!f.exists()){
f.createNewFile();
System.out.println("File not Found so created");
}
fis = new FileInputStream("./testData.xlsx");
wb = WorkbookFactory.create(fis);
sh = wb.getSheet("SheetName");
if(sh == null){
sh = wb.getSheet(SheetName);
}
}catch(Exception e)
{System.out.println(e.getMessage());
}
}
//*************************************************************
public static void setCellData(String text , int rowno , int colno){
try{
row = sh.getRow(rowno);
if(row == null){
row = sh.createRow(rowno);
}
cell = row.getCell(colno);
if(cell!=null){
cell.setCellValue(text);
}
else{
cell = row.createCell(colno);
cell.setCellValue(text);
}
fos = new FileOutputStream(ExcelPath);
wb.write(fos);
fos.flush();
fos.close();
}catch(Exception e){
System.out.println(e.getMessage());
}
}
//*************************************************************
public static String getCellData(int rowno , int colno){
try{
cell = sh.getRow(rowno).getCell(colno);
String CellData = null ;
switch(cell.getCellType()){
case STRING :
CellData = cell.getStringCellValue();
break ;
case NUMERIC :
CellData = Double.toString(cell.getNumericCellValue());
if(CellData.contains(".o")){
CellData = CellData.substring(0,CellData.length()-2);
}
break ;
case BLANK :
CellData = ""; break ;
}
return CellData;
}catch(Exception e){return ""; }
}
//*************************************************************
public static int getLastRow(){
return sh.getLastRowNum();
}
同じファイルを並行して読み書きすることはできません( 読み書きロック )。しかし、一時的なデータ(つまり入出力ストリーム)に対して並列操作を行うことはできます。入力ストリームを閉じた後にのみファイルにデータを書き込みます。以下の手順に従ってください。
import Java.io.File;
import Java.io.FileInputStream;
import Java.io.FileNotFoundException;
import Java.io.FileOutputStream;
import Java.io.IOException;
import Java.sql.Date;
import Java.util.HashMap;
import Java.util.Iterator;
import Java.util.Map;
import Java.util.Set;
import org.Apache.poi.ss.usermodel.Cell;
import org.Apache.poi.ss.usermodel.Row;
import org.Apache.poi.xssf.usermodel.XSSFSheet;
import org.Apache.poi.xssf.usermodel.XSSFWorkbook;
public class XLSXReaderWriter {
public static void main(String[] args) {
try {
File Excel = new File("D://raju.xlsx");
FileInputStream fis = new FileInputStream(Excel);
XSSFWorkbook book = new XSSFWorkbook(fis);
XSSFSheet sheet = book.getSheetAt(0);
Iterator<Row> itr = sheet.iterator();
// Iterating over Excel file in Java
while (itr.hasNext()) {
Row row = itr.next();
// Iterating over each column of Excel file
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "\t");
break;
case Cell.CELL_TYPE_NUMERIC:
System.out.print(cell.getNumericCellValue() + "\t");
break;
case Cell.CELL_TYPE_BOOLEAN:
System.out.print(cell.getBooleanCellValue() + "\t");
break;
default:
}
}
System.out.println("");
}
// writing data into XLSX file
Map<String, Object[]> newData = new HashMap<String, Object[]>();
newData.put("1", new Object[] { 1d, "Raju", "75K", "dev",
"SGD" });
newData.put("2", new Object[] { 2d, "Ramesh", "58K", "test",
"USD" });
newData.put("3", new Object[] { 3d, "Ravi", "90K", "PMO",
"INR" });
Set<String> newRows = newData.keySet();
int rownum = sheet.getLastRowNum();
for (String key : newRows) {
Row row = sheet.createRow(rownum++);
Object[] objArr = newData.get(key);
int cellnum = 0;
for (Object obj : objArr) {
Cell cell = row.createCell(cellnum++);
if (obj instanceof String) {
cell.setCellValue((String) obj);
} else if (obj instanceof Boolean) {
cell.setCellValue((Boolean) obj);
} else if (obj instanceof Date) {
cell.setCellValue((Date) obj);
} else if (obj instanceof Double) {
cell.setCellValue((Double) obj);
}
}
}
// open an OutputStream to save written data into Excel file
FileOutputStream os = new FileOutputStream(Excel);
book.write(os);
System.out.println("Writing on Excel file Finished ...");
// Close workbook, OutputStream and Excel file to prevent leak
os.close();
book.close();
fis.close();
} catch (FileNotFoundException fe) {
fe.printStackTrace();
} catch (IOException ie) {
ie.printStackTrace();
}
}
}
Apache POIライブラリを使って試してください。
public class TakingDataFromExcel {
public static void main(String[] args) {
try
{
FileInputStream x = new FileInputStream(new File("/Users/rajesh/Documents/rajesh.xls"));
//Create Workbook instance holding reference to .xlsx file
Workbook workbook = new HSSFWorkbook(x);
//Get first/desired sheet from the workbook
Sheet sheet = workbook.getSheetAt(0);
//Iterate through each rows one by one
for (Iterator<Row> iterator = sheet.iterator(); iterator.hasNext();) {
Row row = (Row) iterator.next();
for (Iterator<Cell> iterator2 = row.iterator(); iterator2
.hasNext();) {
Cell cell = (Cell) iterator2.next();
System.out.println(cell.getStringCellValue());
}
}
x.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
}