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Java 使用ApachePOI如何读取特定excel列_Java_Excel_Apache Poi - Fatal编程技术网

Java 使用ApachePOI如何读取特定excel列

Java 使用ApachePOI如何读取特定excel列,java,excel,apache-poi,Java,Excel,Apache Poi,使用ApachePOI时excel中出现问题。我可以跨行阅读,但有时我只想阅读特定的列 因此,是否可以读取任何特定列,如仅“A”列或仅“C”列 我使用的是Java语言。您可以循环行并从每行读取相同的单元格(这不是一个列吗?)heikkim是对的,下面是一些根据我的一些代码改编的示例代码: import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.

使用ApachePOI时excel中出现问题。我可以跨行阅读,但有时我只想阅读特定的列

因此,是否可以读取任何特定列,如仅“A”列或仅“C”列


我使用的是Java语言。

您可以循环行并从每行读取相同的单元格(这不是一个列吗?)

heikkim是对的,下面是一些根据我的一些代码改编的示例代码:

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
...
for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
  row = sheet.getRow(rowIndex);
  if (row != null) {
    Cell cell = row.getCell(colIndex);
    if (cell != null) {
      // Found column and there is value in the cell.
      cellValueMaybeNull = cell.getStringCellValue();
      // Do something with the cellValueMaybeNull here ...
      // break; ???
    }
  }
}
import org.apache.poi.ss.usermodel.Cell;
导入org.apache.poi.ss.usermodel.Sheet;
导入org.apache.poi.ss.usermodel.Row;
...

对于(int rowIndex=0;rowIndex,以下是按列读取excel数据的代码

public ArrayList<String> extractExcelContentByColumnIndex(int columnIndex){
        ArrayList<String> columndata = null;
        try {
            File f = new File("sample.xlsx")
            FileInputStream ios = new FileInputStream(f);
            XSSFWorkbook workbook = new XSSFWorkbook(ios);
            XSSFSheet sheet = workbook.getSheetAt(0);
            Iterator<Row> rowIterator = sheet.iterator();
            columndata = new ArrayList<>();

            while (rowIterator.hasNext()) {
                Row row = rowIterator.next();
                Iterator<Cell> cellIterator = row.cellIterator();
                while (cellIterator.hasNext()) {
                    Cell cell = cellIterator.next();

                    if(row.getRowNum() > 0){ //To filter column headings
                        if(cell.getColumnIndex() == columnIndex){// To match column index
                            switch (cell.getCellType()) {
                            case Cell.CELL_TYPE_NUMERIC:
                                columndata.add(cell.getNumericCellValue()+"");
                                break;
                            case Cell.CELL_TYPE_STRING:
                                columndata.add(cell.getStringCellValue());
                                break;
                            }
                        }
                    }
                }
            }
            ios.close();
            System.out.println(columndata);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return columndata;
    }
public ArrayList extractExcelContentByColumnIndex(int-columnIndex){
ArrayList columndata=null;
试一试{
文件f=新文件(“sample.xlsx”)
FileInputStream ios=新的FileInputStream(f);
XSSF工作簿=新XSSF工作簿(ios);
XSSFSheet sheet=workbook.getSheetAt(0);
迭代器rowIterator=sheet.Iterator();
columndata=新的ArrayList();
while(roweiterator.hasNext()){
行=行迭代器。下一步();
迭代器cellIterator=row.cellIterator();
while(cellIterator.hasNext()){
Cell=cellIterator.next();
如果(row.getRowNum()>0){//要筛选列标题
如果(cell.getColumnIndex()==columnIndex){//匹配列索引
开关(cell.getCellType()){
case Cell.Cell\u类型\u数值:
columndata.add(cell.getNumericCellValue()+);
打破
case Cell.Cell\u类型\u字符串:
add(cell.getStringCellValue());
打破
}
}
}
}
}
ios.close();
System.out.println(columndata);
}捕获(例外e){
e、 printStackTrace();
}
返回列数据;
}

好的,从你的问题来看,你只需要阅读一个特定的列。因此,当你在一行上迭代,然后在它的单元格上迭代时,你可以简单地检查列的索引

Iterator<Row> rowIterator = mySheet.iterator(); // Traversing over each row of XLSX file
        while (rowIterator.hasNext()) {
            Row row = rowIterator.next(); // For each row, iterate through each columns
            Iterator<Cell> cellIterator = row.cellIterator();
            while (cellIterator.hasNext()) {
                Cell cell = cellIterator.next();
                println "column index"+cell.getColumnIndex()//You will have your columns fixed in Excel file
                if(cell.getColumnIndex()==3)//for example of c
                {
                print "done"            
                }
          }
     }     
Iterator rowditerator=mySheet.Iterator();//遍历XLSX文件的每一行
while(roweiterator.hasNext()){
Row Row=rowIterator.next();//对于每一行,遍历每一列
迭代器cellIterator=row.cellIterator();
while(cellIterator.hasNext()){
Cell=cellIterator.next();
println“column index”+cell.getColumnIndex()//将在Excel文件中修复列
if(cell.getColumnIndex()==3)//例如c
{
打印“完成”
}
}
}     
我使用的是POI 3.12-“org.apache.POI:POI:3.12” 希望有帮助。干杯

  Sheet sheet  = workBook.getSheetAt(0); // Get Your Sheet.

  for (Row row : sheet) { // For each Row.
      Cell cell = row.getCell(0); // Get the Cell at the Index / Column you want.
  }
我的解决方案在代码方面稍微简单一些。

import java.io.*;
import java.io.*;

import org.apache.poi.hssf.util.CellReference;
import org.apache.poi.ss.usermodel.*;
import java.text.*;

public class XSLXReader {
    static DecimalFormat df = new DecimalFormat("#####0");

    public static void main(String[] args) {
        FileWriter fostream;
        PrintWriter out = null;
        String strOutputPath = "H:\\BLR_Team\\Kavitha\\Excel-to-xml\\";
        String strFilePrefix = "Master_5.2-B";

        try {
            InputStream inputStream = new FileInputStream(new File("H:\\BLR_Team\\Kavitha\\Excel-to-xml\\Stack-up 20L pure storage 11-0039-01 ISU_USA-A 1-30-17-Rev_exm.xls"));
            Workbook wb = WorkbookFactory.create(inputStream);
           // Sheet sheet = wb.getSheet(0);
            Sheet sheet =null;
            Integer noOfSheets= wb.getNumberOfSheets();

            for(int i=0;i<noOfSheets;i++){
                sheet = wb.getSheetAt(i);
                System.out.println("Sheet : "+i + " " + sheet.getSheetName());
                System.out.println("Sheet : "+i + " " + sheet.getFirstRowNum());
                System.out.println("Sheet : "+i + " " + sheet.getLastRowNum());

            //Column 29
            fostream = new FileWriter(strOutputPath + "\\" + strFilePrefix+i+ ".xml");
            out = new PrintWriter(new BufferedWriter(fostream));

            out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            out.println("<Bin-code>");

            boolean firstRow = true;
            for (Row row : sheet) {
                if (firstRow == true) {
                    firstRow = false;
                    continue;
                }
                out.println("\t<DCT>");
                out.println(formatElement("\t\t", "ID", formatCell(row.getCell(0))));
                out.println(formatElement("\t\t", "Table_name", formatCell(row.getCell(1))));
                out.println(formatElement("\t\t", "isProddaten", formatCell(row.getCell(2))));
                out.println(formatElement("\t\t", "isR3P01Data", formatCell(row.getCell(3))));

                out.println(formatElement("\t\t", "LayerNo", formatCell(row.getCell(29))));
                out.println("\t</DCT>");
            }
            CellReference ref = new CellReference("A13");
          Row r = sheet.getRow(ref.getRow());
          if (r != null) {
             Cell c = r.getCell(ref.getCol());
           System.out.println(c.getRichStringCellValue().getString());
          }

            for (Row row : sheet) {
                  for (Cell cell : row) {

                      CellReference cellRef = new CellReference(row.getRowNum(), cell.getColumnIndex());


                      switch (cell.getCellType()) {
                      case Cell.CELL_TYPE_STRING:
                          System.out.println(cell.getRichStringCellValue().getString());
                          break;
                      case Cell.CELL_TYPE_NUMERIC:
                          if (DateUtil.isCellDateFormatted(cell)) {
                              System.out.println(cell.getDateCellValue());
                          } else {
                              System.out.println(cell.getNumericCellValue());
                          }
                          break;
                      case Cell.CELL_TYPE_BOOLEAN:
                          System.out.println(cell.getBooleanCellValue());
                          break;
                      case Cell.CELL_TYPE_FORMULA:
                          System.out.println(cell.getCellFormula());
                          break;
                      case Cell.CELL_TYPE_BLANK:
                          System.out.println();
                          break;
                      default:
                          System.out.println();
                  }
                  }

            }
            out.write("</Bin-code>");
            out.flush();
            out.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static String formatCell(Cell cell)
    {
        if (cell == null) {
            return "";
        }
        switch(cell.getCellType()) {
            case Cell.CELL_TYPE_BLANK:
                return "";
            case Cell.CELL_TYPE_BOOLEAN:
                return Boolean.toString(cell.getBooleanCellValue());
            case Cell.CELL_TYPE_ERROR:
                return "*error*";
            case Cell.CELL_TYPE_NUMERIC:
                return XSLXReader.df.format(cell.getNumericCellValue());
            case Cell.CELL_TYPE_STRING:
                return cell.getStringCellValue();
            default:
                return "<unknown value>";
        }
    }

    private static String formatElement(String prefix, String tag, String value) {
        StringBuilder sb = new StringBuilder(prefix);
        sb.append("<");
        sb.append(tag);
        if (value != null && value.length() > 0) {
            sb.append(">");
            sb.append(value);
            sb.append("</");
            sb.append(tag);
            sb.append(">");
        } else {
            sb.append("/>");
        }
        return sb.toString();
    }
}
导入org.apache.poi.hssf.util.CellReference; 导入org.apache.poi.ss.usermodel.*; 导入java.text.*; 公共类XSLXReader{ 静态DecimalFormat df=新的DecimalFormat(“0”); 公共静态void main(字符串[]args){ 文件写入程序流; PrintWriter out=null; String strOutputPath=“H:\\BLR\u Team\\Kavitha\\Excel to xml\\”; 字符串strFilePrefix=“Master_5.2-B”; 试一试{ InputStream InputStream=新文件InputStream(新文件(“H:\\BLR\U团队\\Kavitha\\Excel到xml\\Stack up 20L纯存储11-0039-01 ISU\U USA-A 1-30-17-Rev_exm.xls”); 工作簿wb=WorkbookFactory.create(inputStream); //Sheet Sheet=wb.getSheet(0); Sheet=null; 整数noOfSheets=wb.getNumberOfSheets(); 对于(int i=0;i 0){ 某人加上(“>”); 附加(价值); 某人加上(“”); }否则{ 某人加上(“/>”); } 使某人返回字符串(); } }
此代码有3个功能:

  • Excel到XML文件生成。工程名称Dong Kim
  • 打印特定单元格的内容:A13
  • 还要将excel内容打印为正常文本格式。要导入的.jar:poi-3.9.jar、poi-ooxml-3.9.jar、poi-ooxml-schemas-3.9.jar、xbea‌​n-2.3.0.jar,xmlbeans‌​-xmlpublic-2.4.0.jar‌​,dom4j-1.5.jar

  • 请注意,使用行单元格迭代器(
    iterator cellIterator=row.cellIterator();
    )遍历列可能会导致无提示跳过列。我刚刚遇到一个文档公开了这种行为


    在for循环中使用索引并使用
    row.getCell(i)进行迭代
    没有跳过列,而是在正确的列索引处返回值。

    谢谢Brian的回答。.是的,但是如果col1填充了4个单元格,而col5填充了6个单元格,我会感到困惑,因为我正在将这些数据输入到测试输入值。那么,您能告诉我如何找到列中填充的单元格数吗…请帮助谢谢Christophe..但我有一个疑问..我在col1中有4个单元格填充,但在col3中有8个单元格填充,所以当我运行代码时,它将运行8次,但我只需要col1中的4个单元格,我只需要在特定列中填充单元格的数量,因为我正在将此计数和数据输入测试的输入..请再次帮助感谢您的时间和代码…只需跳过单元格中具有now值的行即可?我添加了一个
    break
    ,在这种情况下忘记它是一个伟大的经典:)您可以直接使用
    cell=row.getCell(theColIndexYouWant);
    ,而不是我们