POI讀取Excel 各種特殊數字和型別的轉換。取值帶一個E
阿新 • • 發佈:2019-01-05
1, 對於類似電話號碼或手機一類的大數值讀取問題
// 取值後會帶一個E的問題
double cellValue = row.getCell(k).getNumericCellValue();
fieldValues[k] = new DecimalFormat("#").format(cellValue);
2, 對於數值型單元的純數值和日期型的處理
case HSSFCell.CELL_TYPE_NUMERIC: // 數值型 if (HSSFDateUtil.isCellDateFormatted(cell)) { // 如果是date型別則 ,獲取該cell的date值 value = HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString(); } else { // 純數字 value = String.valueOf(cell.getNumericCellValue()); }
轉: POI讀取Excel淺談
先看程式碼,挨句解釋:
一般遍歷使用兩種方式,1:得到總的行數和每行的列數,然後迴圈。2:使用迭代
先看第一種:
得到Excel的檔案然後讀取,這個很簡單。關鍵有兩個地方,也許在網上會看到有的這樣使用有的那樣使用。Java程式碼 package com.golden.test; import java.io.File; import java.io.FileInputStream; 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; /** * * @author 崔素強 * */ public class PoiReadXls2 { public static void main(String[] args) { File f = new File("c:\\a.xls"); try { FileInputStream is = new FileInputStream(f); HSSFWorkbook wbs = new HSSFWorkbook(is); HSSFSheet childSheet = wbs.getSheetAt(0); // System.out.println(childSheet.getPhysicalNumberOfRows()); System.out.println("有行數" + childSheet.getLastRowNum()); for (int j = 0; j < childSheet.getLastRowNum(); j++) { HSSFRow row = childSheet.getRow(j); // System.out.println(row.getPhysicalNumberOfCells()); // System.out.println("有列數" + row.getLastCellNum()); if (null != row) { for (int k = 0; k < row.getLastCellNum(); k++) { HSSFCell cell = row.getCell(k); if (null != cell) { switch (cell.getCellType()) { case HSSFCell.CELL_TYPE_NUMERIC: // 數字 System.out.print(cell.getNumericCellValue() + " "); break; case HSSFCell.CELL_TYPE_STRING: // 字串 System.out.print(cell.getStringCellValue() + " "); break; case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean System.out.println(cell.getBooleanCellValue() + " "); break; case HSSFCell.CELL_TYPE_FORMULA: // 公式 System.out.print(cell.getCellFormula() + " "); break; case HSSFCell.CELL_TYPE_BLANK: // 空值 System.out.println(" "); break; case HSSFCell.CELL_TYPE_ERROR: // 故障 System.out.println(" "); break; default: System.out.print("未知型別 "); break; } } else { System.out.print("- "); } } } System.out.println(); } } catch (Exception e) { e.printStackTrace(); } } } package com.golden.test; import java.io.File; import java.io.FileInputStream; 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; /** * * @author 崔素強 * */ public class PoiReadXls2 { public static void main(String[] args) { File f = new File("c:\\a.xls"); try { FileInputStream is = new FileInputStream(f); HSSFWorkbook wbs = new HSSFWorkbook(is); HSSFSheet childSheet = wbs.getSheetAt(0); // System.out.println(childSheet.getPhysicalNumberOfRows()); System.out.println("有行數" + childSheet.getLastRowNum()); for (int j = 0; j < childSheet.getLastRowNum(); j++) { HSSFRow row = childSheet.getRow(j); // System.out.println(row.getPhysicalNumberOfCells()); // System.out.println("有列數" + row.getLastCellNum()); if (null != row) { for (int k = 0; k < row.getLastCellNum(); k++) { HSSFCell cell = row.getCell(k); if (null != cell) { switch (cell.getCellType()) { case HSSFCell.CELL_TYPE_NUMERIC: // 數字 System.out.print(cell.getNumericCellValue() + " "); break; case HSSFCell.CELL_TYPE_STRING: // 字串 System.out.print(cell.getStringCellValue() + " "); break; case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean System.out.println(cell.getBooleanCellValue() + " "); break; case HSSFCell.CELL_TYPE_FORMULA: // 公式 System.out.print(cell.getCellFormula() + " "); break; case HSSFCell.CELL_TYPE_BLANK: // 空值 System.out.println(" "); break; case HSSFCell.CELL_TYPE_ERROR: // 故障 System.out.println(" "); break; default: System.out.print("未知型別 "); break; } } else { System.out.print("- "); } } } System.out.println(); } } catch (Exception e) { e.printStackTrace(); } } }
System.out.println("有行數" + childSheet.getLastRowNum());
System.out.println(childSheet.getPhysicalNumberOfRows());
System.out.println("有列數" + row.getLastCellNum());
System.out.println(row.getPhysicalNumberOfCells());
如果人都拷貝程式碼進行使用了,不知道有什麼區別。太多的區別不知道,但是有一點我發現了,那就是如果中間各行或者隔列的話getPhysicalNumberOfRows和getPhysicalNumberOfCells就不能讀取到所有的行和列了。
再者,一定要對單元格的格式進行判斷switch (cell.getCellType()),不同的單元格格式使用不同的方法。最後加上為止型別,以防萬一。
而且在數字型別裡,又分為了純數字和時間格式:
case HSSFCell.CELL_TYPE_NUMERIC: // 數值型
if (HSSFDateUtil.isCellDateFormatted(cell)) {
// 如果是date型別則 ,獲取該cell的date值
value = HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString();
} else { // 純數字
value = String.valueOf(cell.getNumericCellValue());
}
case HSSFCell.CELL_TYPE_NUMERIC: // 數值型
if (HSSFDateUtil.isCellDateFormatted(cell)) {
// 如果是date型別則 ,獲取該cell的date值
value = HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString();
} else { // 純數字
value = String.valueOf(cell.getNumericCellValue());
}
還有一種迭代的方法:
package com.golden.test;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
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;
/**
*
* @author 崔素強
*
*/
public class PoiReadXls {
@SuppressWarnings( { "unchecked", "deprecation" })
public static void main(String[] args) {
File f = new File("c:\\a.xls");
try {
InputStream input = new FileInputStream(f);
POIFSFileSystem fs = new POIFSFileSystem(input);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
Iterator rows = sheet.rowIterator();
while (rows.hasNext()) {
HSSFRow row = (HSSFRow) rows.next();
// System.out.print("行:" + row.getRowNum() + " ");
Iterator cells = row.cellIterator();
while (cells.hasNext()) {
HSSFCell cell = (HSSFCell) cells.next();
// System.out.println("列:" + cell.getCellNum());
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC: // 數字
System.out.print(cell.getNumericCellValue() + " ");
break;
case HSSFCell.CELL_TYPE_STRING: // 字串
System.out.print(cell.getStringCellValue() + " ");
break;
case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
System.out.println(cell.getBooleanCellValue() + " ");
break;
case HSSFCell.CELL_TYPE_FORMULA: // 公式
System.out.print(cell.getCellFormula() + " ");
break;
case HSSFCell.CELL_TYPE_BLANK: // 空值
System.out.println(" ");
break;
case HSSFCell.CELL_TYPE_ERROR: // 故障
System.out.println(" ");
break;
default:
System.out.print("未知型別 ");
break;
}
}
System.out.println();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
package com.golden.test;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
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;
/**
*
* @author 崔素強
*
*/
public class PoiReadXls {
@SuppressWarnings( { "unchecked", "deprecation" })
public static void main(String[] args) {
File f = new File("c:\\a.xls");
try {
InputStream input = new FileInputStream(f);
POIFSFileSystem fs = new POIFSFileSystem(input);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
Iterator rows = sheet.rowIterator();
while (rows.hasNext()) {
HSSFRow row = (HSSFRow) rows.next();
// System.out.print("行:" + row.getRowNum() + " ");
Iterator cells = row.cellIterator();
while (cells.hasNext()) {
HSSFCell cell = (HSSFCell) cells.next();
// System.out.println("列:" + cell.getCellNum());
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC: // 數字
System.out.print(cell.getNumericCellValue() + " ");
break;
case HSSFCell.CELL_TYPE_STRING: // 字串
System.out.print(cell.getStringCellValue() + " ");
break;
case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
System.out.println(cell.getBooleanCellValue() + " ");
break;
case HSSFCell.CELL_TYPE_FORMULA: // 公式
System.out.print(cell.getCellFormula() + " ");
break;
case HSSFCell.CELL_TYPE_BLANK: // 空值
System.out.println(" ");
break;
case HSSFCell.CELL_TYPE_ERROR: // 故障
System.out.println(" ");
break;
default:
System.out.print("未知型別 ");
break;
}
}
System.out.println();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
這種方法,如果資料的緊湊的,使用還是方便的,但是我發現,如果是空行或者是空列,他就會隔過去。具體的自己試試就知道了。
另外,也能看到這裡得到Excel檔案的方式是通過File,如果要引用到Struts2裡,這是很簡單的,因為Struts2上傳時Action裡定義的就是File或者File陣列。