使用HSSF读取excel文件

Question

Emp ID名称薪资

1.0约翰2000000.0

2.0院长4200000.0

3.0 sam 2800000.0

4.0 cass 600000.0

我创建了以下代码：

import java.io.File;
import java.io.FileInputStream;
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 sample2
 {
    public static void main(String[] args) {
    new sample2().sample2();
}
 }


FileInputStream file = new FileInputStream(new File("C:\\test.xls"));
//Get the workbook instance for XLS file 
HSSFWorkbook workbook = new HSSFWorkbook(test);

//Get first sheet from the workbook
HSSFSheet sheet = workbook.getSheetAt(0);

//Get iterator to all the rows in current sheet
Iterator<Row> rowIterator = sheet.iterator();

//Get iterator to all cells of current row
Iterator<Cell> cellIterator = row.cellIterator();


try {

  FileInputStream file = new FileInputStream(new File("C:\\test.xls"));

  //Get the workbook instance for XLS file 
  HSSFWorkbook workbook = new HSSFWorkbook(file);

  //Get first sheet from the workbook
  HSSFSheet sheet = workbook.getSheetAt(0);

  //Iterate through each rows from first sheet
   Iterator<Row> rowIterator = sheet.iterator();
   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();

        switch(cell.getCellType()) {
            case Cell.CELL_TYPE_BOOLEAN:
                System.out.print(cell.getBooleanCellValue() + "\t\t");
                break;
            case Cell.CELL_TYPE_NUMERIC:
                System.out.print(cell.getNumericCellValue() + "\t\t");
                break;
            case Cell.CELL_TYPE_STRING:
                System.out.print(cell.getStringCellValue() + "\t\t");
                break;
        }
    }
    System.out.println("");
   }
   file.close();
   FileOutputStream out = 
     new FileOutputStream(new File("C:\\test.xls"));
  workbook.write(out);
  out.close();

} catch (FileNotFoundException e) {
  e.printStackTrace();
} catch (IOException e) {
  e.printStackTrace();

}

用于使用POI库从此excel文件中读取内容。我的编辑器是Eclipse。但是当我运行程序时，我遇到了这样的问题:线程"main“中的异常java.lang.Error:未解决的编译问题:未为类型sample2定义sample2()方法

at sample2.main(sample2.java:17)

有什么帮助吗？提前谢谢你！

Answer 1

public class sample2
 {
    public static void main(String[] args) {
    new sample2().sample2(); // This is wrong too.
    }
 }

在此之后的所有代码都是毫无意义的。您的课程基本上已经以第二个}结束了。

您可能希望在main()方法中移动所有这些内容。

此外，main()方法new sample2().sample2();中的这段代码是错误的。

应该是这样的

sample2 s = new sample2();

Answer 2

删除代码中的最后一个大括号：

{
public static void main(String[] args) {
new sample2().sample2();

}}

然后创建一个名为test2()的方法，如下所示：

public void sample2(){ //Put your code here }