使用Apache POI读取excel文件 [英] read excel file using Apache POI

问题描述

我创建了这段代码来使用 Apache POI 读取 excel 文件的内容.我使用 eclipse 作为编辑器，但是当我运行代码时，我在粗体行中遇到了问题.有什么问题?excel的内容如下:

I have created this code to read the contents of excel files using Apache POI. I am using eclipse as editor but when i ran the code i have problem in the line that I have in bold. What's the problem? The content of excel is the following:

Emp ID  Name    Salary

 1.0    john    2000000.0

 2.0    dean    4200000.0

 3.0    sam     2800000.0

 4.0    cass    600000.0

<小时>

import java.io.*;
import java.util.ArrayList;
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.poi.poifs.filesystem.POIFSFileSystem;



public class ExcelRead {

public static void main(String[] args) throws Exception {
    File excel = new File ("C:\\Users\\Efi\\Documents\\test.xls");
    FileInputStream fis = new FileInputStream(excel);

    HSSFWorkbook wb = new HSSFWorkbook(fis);
    HSSFSheet ws = wb.getSheet("Input");

    int rowNum = ws.getLastRowNum()+1;
    int colNum = ws.getRow(0).getLastCellNum();
    String[][] data = new String[rowNum][colNum];


    for (int i=0; i<rowNum; i++){
        HSSFRow row = ws.getRow(i);
            for (int j=0; j<colNum; j++){
                HSSFCell cell = row.getCell(j);
                String value = cellToString(cell);
                data[i][j] = value;
                System.out.println("The value is" + value);

            }
       }
    }

public static String cellToString (HSSFCell cell){

int type;
Object result;
type = cell.getCellType();

    switch(type) {


    case 0://numeric value in excel
        result = cell.getNumericCellValue();
        break;
    case 1: //string value in excel
        result = cell.getStringCellValue();
        break;
    case 2: //boolean value in excel
        result = cell.getBooleanCellValue ();
        break;
    default:
        ***throw new RunTimeException("There are not support for this type of               
       cell");***
        }

return result.toString();
}

}

推荐答案

检查 这个库已创建用于非常轻松地读取 XLSX、XLS 和 CSV 文件.它使用 Apache POI 处理 excel 文件，并根据您的配置将 excel 行转换为 Java bean 列表.

Check this library that I've created for reading both XLSX, XLS and CSV files pretty easily. It uses Apache POI for processing excel files and converts excel rows into a list of Java beans based on your configuration.

这是一个例子:

RowConverter<Country> converter = (row) -> new Country(row[0], row[1]);

ExcelReader<Country> reader = ExcelReader.builder(Country.class)
     .converter(converter)
     .withHeader()
     .csvDelimiter(';')
     .sheets(1)
     .build();

List<Country> list;
list = reader.read("src/test/resources/CountryCodes.xlsx");
list = reader.read("src/test/resources/CountryCodes.xls");
list = reader.read("src/test/resources/CountryCodes.csv");

使用以下 excel 和 bean 文件:

With following excel and bean files:

public static class Country {
  public String shortCode;
  public String name;

  public Country(String shortCode, String name) {
    this.shortCode = shortCode;
    this.name = name;
  }
}

Excel:

    Code    Country
ad  Andorra
ae  United Arab Emirates
af  Afghanistan
ag  Antigua and Barbuda
...

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