java parse excel

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;
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;

/**
* EXCEL文档解析工具类
* 该工具能将EXCEL文档中的表解析为由JAVA基础类构成的数据集合
* 整个EXCEL表由多个行组成.每行用一个LIST表示.
* EXCEL中的行由一个LIST表示,各列的数据索引从0开始一一对齐存放在这个LIST中;
* 多个行构成整个表,由一个LIST存放多个行.
*
*******************************************
* com.trumptech.common.fileParser.excel
* 2007-6-15
* 16:20:38
* author linfan
*******************************************
*/
public class ExcelSheetParser {

private Logger logger= Logger.getLogger(ExcelSheetParser.class);


private HSSFWorkbook workbook ;

public ExcelSheetParser(File excelFile) throws FileNotFoundException, IOException{

workbook = new HSSFWorkbook(new FileInputStream(excelFile));
}

/**
* 获得表中的数据
* @param sheetNumber 表格索引(EXCEL 是多表文档,所以需要输入表索引号)
* @return 由LIST构成的行和表
* @throws FileNotFoundException
* @throws IOException
*/
public List<List> getDatasInSheet(int sheetNumber) throws FileNotFoundException, IOException{
List<List> result = new ArrayList<List>();

//获得指定的表
HSSFSheet sheet = workbook.getSheetAt(sheetNumber);

//获得数据总行数
int rowCount = sheet.getLastRowNum();
logger.info("found excel rows count: " + rowCount);
if (rowCount < 1) {
return result;
}

//逐行读取数据
for (int rowIndex = 0; rowIndex <= rowCount; rowIndex++) {

//获得行对象
HSSFRow row = sheet.getRow(rowIndex);

if (row != null) {

List<Object> rowData = new ArrayList<Object>();

//获得本行中单元格的个数
int columnCount = row.getLastCellNum();

//获得本行中各单元格中的数据
for (short columnIndex = 0; columnIndex < columnCount; columnIndex++) {
HSSFCell cell = row.getCell(columnIndex);

//获得指定单元格中数据
Object cellStr = this.getCellString(cell);

rowData.add(cellStr);

}

result.add(rowData);
}
}
return result;
}

/**
* 获得单元格中的内容
* @param cell
* @return
*/
protected Object getCellString(HSSFCell cell){
Object result = null;
if (cell != null) {

int cellType = cell.getCellType();

switch(cellType){

case HSSFCell.CELL_TYPE_STRING :
result = cell.getRichStringCellValue().getString();
break;
case HSSFCell.CELL_TYPE_NUMERIC:
result=cell.getNumericCellValue();
break;
case HSSFCell.CELL_TYPE_FORMULA:
result = cell.getNumericCellValue();
break;
case HSSFCell.CELL_TYPE_ERROR:
result=null;
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
result=cell.getBooleanCellValue();
break;
case HSSFCell.CELL_TYPE_BLANK:
result=null;
break;
}
}
return result;
}

public static void main(String[] args) throws Exception {
File file = new File("D://tmp//test.xls");
ExcelSheetParser parser = new ExcelSheetParser(file);
List<List> datas = parser.getDatasInSheet(0);

for(int i=0;i<datas.size();i++){//显示数据
List row = datas.get(i);
for(short n=0;n<row.size() ;n++){
Object value = row.get(n);
String data = String.valueOf(value);
System.out.print(data +"/t");
}
System.out.println();
}
}
}