问题
I need to read specific column of an excel sheet and then declare the variables in java. The program that I have done reads the entire content of excel sheet. But I need to read a fixed column like C.
This is what I have done:
import java.io.File;
import java.io.IOException;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
public class JavaApplication4
{
private String inputFile;
String[][] data = null;
public void setInputFile(String inputFile)
{
this.inputFile = inputFile;
}
public String[][] read() throws IOException
{
File inputWorkbook = new File(inputFile);
Workbook w;
try
{
w = Workbook.getWorkbook(inputWorkbook);
// Get the first sheet
Sheet sheet = w.getSheet(0);
data = new String[sheet.getColumns()][sheet.getRows()];
// Loop over first 10 column and lines
// System.out.println(sheet.getColumns() + " " +sheet.getRows());
for (int j = 0; j <sheet.getColumns(); j++)
{
for (int i = 0; i < sheet.getRows(); i++)
{
Cell cell = sheet.getCell(j, i);
data[j][i] = cell.getContents();
// System.out.println(cell.getContents());
}
}
for (int j = 0; j < data.length; j++)
{
for (int i = 0; i <data[j].length; i++)
{
System.out.println(data[j][i]);
}
}
}
catch (BiffException e)
{
e.printStackTrace();
}
return data;
}
public static void main(String[] args) throws IOException
{
JavaApplication4 test = new JavaApplication4();
test.setInputFile("C://users/admin/Desktop/Content.xls");
test.read();
}
}
Here is my excel sheet,
From a bowl of chits numbered /@v1@/ to /@v2@/ , a single chit is randomly drawn. Find the probability that the chit drawn is a number that is a multiple of /@v3@/ or /@ v4@/?
I need to read this data and by matching the pattern /@v1@1, I need to declare the variables. How can I do this?
回答1:
What you can do, you should first get all the columns from the sheet by using sheet.getColumns() and store all columns in a list . Then you can match get all values based on columns. or you can get for only column "C".try using below code. let me know if this works.
int masterSheetColumnIndex = sheet.getColumns();
List<String> ExpectedColumns = new ArrayList<String>();
for (int x = 0; x < masterSheetColumnIndex; x++) {
Cell celll = sheet.getCell(x, 0);
String d = celll.getContents();
ExpectedColumns.add(d);
}
LinkedHashMap<String, List<String>> columnDataValues = new LinkedHashMap<String, List<String>>();
List<String> column1 = new ArrayList<String>();
// read values from driver sheet for each column
for (int j = 0; j < masterSheetColumnIndex; j++) {
column1 = new ArrayList<String>();
for (int i = 1; i < sheet.getRows(); i++) {
Cell cell = sheet.getCell(j, i);
column1.add(cell.getContents());
}
columnDataValues.put(ExpectedColumns.get(j), column1);
}
回答2:
This is the very simple and efficient code and Working as expected
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
public class TestExcelFile {
public static void main(String[] args) {
String envFilePath = System.getenv("AZURE_FILE_PATH");
// upload list of files/directory to blob storage
File folder = new File(envFilePath);
File[] listOfFiles = folder.listFiles();
for (int i = 0; i < listOfFiles.length; i++) {
if (listOfFiles[i].isFile()) {
System.out.println("File " + listOfFiles[i].getName());
Workbook workbook;
//int masterSheetColumnIndex = 0;
try {
workbook = WorkbookFactory.create(new FileInputStream(envFilePath + "\\"+ listOfFiles[i].getName()));
// Get the first sheet.
Sheet sheet = workbook.getSheetAt(0);
//we will search for column index containing string "Your Column Name" in the row 0 (which is first row of a worksheet
String columnWanted = "Column_Name";
Integer columnNo = null;
//output all not null values to the list
List<Cell> cells = new ArrayList<Cell>();
// Get the first cell.
Row row = sheet.getRow(0);
//Cell cell = row.getCell(0);
for (Cell cell : row) {
// Column header names.
//System.out.println(cell.toString());
if (cell.getStringCellValue().equals(columnWanted)){
columnNo = cell.getColumnIndex();
}
}
if (columnNo != null){
for (Row row1 : sheet) {
Cell c = row1.getCell(columnNo);
if (c == null || c.getCellType() == Cell.CELL_TYPE_BLANK) {
// Nothing in the cell in this row, skip it
} else {
cells.add(c);
//System.out.println(c);
}
}
}else{
System.out.println("could not find column " + columnWanted + " in first row of " + listOfFiles[i].getName());
}
} catch (InvalidFormatException | IOException e) {
e.printStackTrace();
}
}
}
}
}
回答3:
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package xlsxreader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
/**
*
* @author khaled
*/
public class XlsxReader {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws FileNotFoundException, IOException, InvalidFormatException {
File file = new File("C:\\Users\\khaled\\Desktop\\myXLSX file.xlsx");
Workbook workbook = WorkbookFactory.create(new FileInputStream(file));
Sheet sheet = workbook.getSheetAt(0);
int column_index_1 = 0;
int column_index_2 = 0;
int column_index_3 = 0;
Row row = sheet.getRow(0);
for (Cell cell : row) {
// Column header names.
switch (cell.getStringCellValue()) {
case "MyFirst Column":
column_index_1 = cell.getColumnIndex();
break;
case "3rd Column":
column_index_2 = cell.getColumnIndex();
break;
case "forth Column":
column_index_3 = cell.getColumnIndex();
break;
}
}
for (Row r : sheet) {
if (r.getRowNum()==0) continue;//hearders
Cell c_1 = r.getCell(column_index_1);
Cell c_2 = r.getCell(column_index_2);
Cell c_3 = r.getCell(column_index_3);
if (c_1 != null && c_1.getCellType() != Cell.CELL_TYPE_BLANK
&&c_2 != null && c_2.getCellType() != Cell.CELL_TYPE_BLANK
&&c_3 != null && c_3.getCellType() != Cell.CELL_TYPE_BLANK) {
System.out.print(" "+c_1 + " " + c_2+" "+c_3+"\n");
}
}
}
}
来源：https://stackoverflow.com/questions/27499147/reading-specific-column-of-excel-into-java-program