excel学习笔记之二
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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 ExcelOperate {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
File file = new File("E:\\data.xls");
String[][] result = getData(file, 0);
int rowLength = result.length;
for(int i = 0;i < rowLength; i++)
{
for(int j = 0; j < result[i].length; j++)
{
System.out.println(result[i][j] + "\t");
}
//System.out.println();
}
}
/**
* 读取Excel的内容，第一维数组存储的是一行中格列的值，二维数组存储的是多少个行
* @param file 读取数据的源Excel
* @param ignoreRows 读取数据忽略的行数，比喻行头不需要读入 忽略的行数为1
* @return 读出的Excel中数据的内容
* @throws FileNotFoundException
* @throws IOException
*/
@SuppressWarnings("deprecation")
private static String[][] getData(File file, int ignoreRows) throws FileNotFoundException, IOException
{
List<String[]> result = new ArrayList<String[]>();
int rowSize = 0;
BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
// 打开HSSFWorkbook
POIFSFileSystem fs = new POIFSFileSystem(in);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFCell cell = null;
for(int sheetIndex = 0;sheetIndex < wb.getNumberOfSheets(); sheetIndex++)
{
HSSFSheet st = wb.getSheetAt(sheetIndex);
// 第一行为标题，不取
for(int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum();rowIndex++)
{
HSSFRow row = st.getRow(rowIndex);
if(row == null)
{
continue;
}
int tempRowSize = row.getLastCellNum() + 1;
if (tempRowSize > rowSize)
{
rowSize = tempRowSize;
}
String[] values = new String[rowSize];
Arrays.fill(values, "");
boolean hasValue = false;
for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++)
{
String value = " ";
cell = row.getCell(columnIndex);
if(cell != null)
{
// 注意：一定要设成这个，否则可能会出现乱码
//www.nabble.com论坛上找的一段话，3.2已经自动Unicode处理了。
//cell.setEncoding(HSSFCell.ENCODING_UTF_16);
switch (cell.getCellType())
{
case HSSFCell.CELL_TYPE_STRING:
value = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_NUMERIC:
if (HSSFDateUtil.isCellDateFormatted(cell))
{
Date date = cell.getDateCellValue();
if(date != null)
{
value = new SimpleDateFormat("YYY-MM-dd").format(date);
}
else
{
value = "";
}
}
else {
value = new DecimalFormat("0").format(cell.getNumericCellValue());
}
break;
case HSSFCell.CELL_TYPE_FORMULA:
// 导入时如果为公式生成的数据则无值
if (!cell.getStringCellValue().equals(""))
{
value = cell.getStringCellValue();
}
else
{
value = cell.getNumericCellValue() + "";
}
break;
case HSSFCell.CELL_TYPE_BLANK:
break;
case HSSFCell.CELL_TYPE_ERROR:
value = "";
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
value = (cell.getBooleanCellValue() == true ? "Y" : "N");
break;
default:
value = "";
}
}
if (columnIndex == 0 && value.trim().equals(""))
{
break;
}
values[columnIndex] = rightTrim(value);
hasValue = true;
}
if(hasValue)
{
result.add(values);
}
}
}
in.close();
String[][] returnArray = new String[result.size()][rowSize];
for(int i = 0; i < returnArray.length; i++)
{
returnArray[i] = (String[])result.get(i);
}
return returnArray;
}
/**
* 去掉字符串右边的空格
* @param str 要处理的字符串
* @return 处理后的字符串
*/
public static String rightTrim(String str)
{
if (str == null ) {
return "";
}
int length = str.length();
for(int i = length - 1; i >= 0;i--)
{
if(str.charAt(i) != 0x20)
{
break;
}
length--;
}
return str.substring(0,length);
}
}
结果：
43057
1
第一个字符串
Y
0
N
