POI native introducing reading method EXCEL
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
public class ReadExcelUtil {
private POIFSFileSystem fs;
private HSSFWorkbook wb;
private HSSFSheet sheet;
private HSSFRow row;
/**
* Read the contents of the header of the Excel spreadsheet
* @param is
* @Return String array header content
*/
public String[] readExcelTitle(InputStream is) {
try {
fs = new POIFSFileSystem(is);
wb = new HSSFWorkbook(fs);
} catch (IOException e) {
e.printStackTrace ();
}
sheet = wb.getSheetAt(0);
// get the first line row
row = sheet.getRow(0);
The total number of columns // title
int colNum = row.getPhysicalNumberOfCells();
String[] title = new String[colNum];
for (int i = 0; i < colNum; i++) {
title[i] = getCellFormatValue(row.getCell((short) i));
}
return title;
}
/**
* Read Excel data content
* @param is
* @Return Map Map object that contains the cell data content
*/
public Map readExcelContent(InputStream is) {
Map content = new HashMap();
String str = "";
String strCell = "";
try {
fs = new POIFSFileSystem(is);
wb = new HSSFWorkbook(fs);
} catch (IOException e) {
e.printStackTrace ();
}
sheet = wb.getSheetAt(0);
// get the number of rows
int rowNum = sheet.getLastRowNum();
// Since the 0th row and the first row has been incorporated herein index from start 2
row = sheet.getRow(2);
int colNum = row.getPhysicalNumberOfCells();
// body content should start from the second row, first row header title
for (int i = 2; i <= rowNum; i++) {
row = sheet.getRow(i);
int j = 0;
while (j < colNum) {
strCell = getStringCellValue(row.getCell(j));
str += strCell + "-";
// str +=row.getCell((short) j) + "^";
j++;
}
content.put(i, str);
str = "";
}
return content;
}
/**
* Acquiring cell data content type string data
*
* @Param cell Excel cells
* @Return String cell data content
*/
private String getStringCellValue(HSSFCell cell) {
String strCell = "";
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
strCell = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_NUMERIC:
strCell = String.valueOf((int)cell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
strCell = String.valueOf(cell.getBooleanCellValue());
break;
case HSSFCell.CELL_TYPE_BLANK:
strCell = "";
break;
default:
strCell = "";
break;
}
if (strCell.equals("") || strCell == null) {
return "";
}
if (cell == null) {
return "";
}
return strCell;
}
/**
* Acquiring cell data content of the data type Date
*
* @param cell
* Excel cells
* @Return String cell data content
*/
private String getDateCellValue(HSSFCell cell) {
String result = "";
try {
int cell type = cell.getCellType ();
if (cellType == HSSFCell.CELL_TYPE_NUMERIC) {
Date date = cell.getDateCellValue();
result = (date.getYear() + 1900) + "-" + (date.getMonth() + 1)
+ "-" + date.getDate();
} else if (cellType == HSSFCell.CELL_TYPE_STRING) {
String date = getStringCellValue(cell);
result = date.replaceAll("[年月]", "-").replace("日", "").trim();
} else if (cellType == HSSFCell.CELL_TYPE_BLANK) {
result = "";
}
} catch (Exception e) {
System.out.println ( "Date format is not correct!");
e.printStackTrace ();
}
return result;
}
/**
* The data set type HSSFCell
* @param cell
* @return
*/
private String getCellFormatValue(HSSFCell cell) {
String cellvalue = "";
if (cell != null) {
Analyzing current // Type of Cell
switch (cell.getCellType()) {
// If the current Cell Type to NUMERIC
case HSSFCell.CELL_TYPE_NUMERIC:
case HSSFCell.CELL_TYPE_FORMULA: {
// determine whether the current cell is Date
if (HSSFDateUtil.isCellDateFormatted(cell)) {
Date date = cell.getDateCellValue();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
CellValue = sdf.format (date);
} Wuxi Women's Hospital ××× http://wapyyk.39.net/wx/zonghe/fc96e.html
// If it is a pure digital
else {
// Get the current value of the Cell
cellvalue = String.valueOf(cell.getNumericCellValue());
}
break;
}
// If the current Cell Type is STRIN
case HSSFCell.CELL_TYPE_STRING:
// Get the current string Cell
cellvalue = cell.getRichStringCellValue().getString();
break;
// the default value Cell
default:
cellvalue = " ";
}
} else {
cellvalue = "";
}
return cellvalue;
}
public static void main(String[] args) {
try {
// to read Excel spreadsheet title test
InputStream is = new FileInputStream("d:\\test2.xls");
ReadExcelUtil excelReader = new ReadExcelUtil();
String[] title = excelReader.readExcelTitle(is);
System.out.println ( "headline Excel table:");
for (String s : title) {
System.out.print(s + " ");
}
System.out.println();
// to read Excel spreadsheet content test
InputStream is2 = new FileInputStream("d:\\test2.xls");
Map map = excelReader.readExcelContent(is2);
System.out.println ( "get the contents of the Excel spreadsheet:");
// here because the merged cell xls require special handling for index
for (int i = 2; i <= map.size()+1; i++) {
System.out.println(map.get(i));
}
} catch (FileNotFoundException e) {
System.out.println ( "specified path was not found in the file!");
e.printStackTrace ();
}
}
}