您好我已经编写了一个Java类，可以逐页读取和写入Excel数据。
package com.ge.dwf.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
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.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.util.CellRangeAddress;
public class Util {
public static void main(String[] args) throws IOException {
FileInputStream file = new FileInputStream(new File("SiteData.xls"));
// Create Workbook instance holding reference to .xlsx file
HSSFWorkbook workbook = new HSSFWorkbook(file);
for (int i = 0; i < workbook.getNumberOfSheets(); i++) {
HSSFSheet sheet = workbook.getSheetAt(i);
// create new sheet in the excel file.
System.out.println("Sheet Name is" + sheet.getSheetName());
HSSFSheet newSheet = createSheet(sheet.getSheetName());
copySheets(newSheet, sheet, true);
}
workbook.close();
file.close();
}
public static HSSFSheet createSheet(String SheetName) throws IOException {
// Create a workbook object.
Workbook workbook = new HSSFWorkbook();
// Create two sheet by calling createSheet of workbook.
HSSFSheet sheet=(HSSFSheet) workbook.createSheet(SheetName);
// Create a FileOutputStream by passing the excel file name.
FileOutputStream outputStream = new FileOutputStream("POINewSheetExample.xls");
// Write the FileOutputStream to workbook object.
workbook.write(outputStream);
// Finally close the FileOutputStream.
outputStream.close();
return sheet;
}
public static void copySheets(HSSFSheet newSheet, HSSFSheet sheet) {
copySheets(newSheet, sheet, true);
}
public static void copySheets(HSSFSheet newSheet, HSSFSheet sheet, boolean copyStyle) {
int maxColumnNum = 0;
Map<Integer, HSSFCellStyle> styleMap = (copyStyle) ? new HashMap<Integer, HSSFCellStyle>() : null;
for (int i = sheet.getFirstRowNum(); i <= sheet.getLastRowNum(); i++) {
HSSFRow srcRow = sheet.getRow(i);
HSSFRow destRow = newSheet.createRow(i);
if (srcRow != null) {
Util.copyRow(sheet, newSheet, srcRow, destRow, styleMap);
if (srcRow.getLastCellNum() > maxColumnNum) {
maxColumnNum = srcRow.getLastCellNum();
}
}
}
for (int i = 0; i <= maxColumnNum; i++) {
newSheet.setColumnWidth(i, sheet.getColumnWidth(i));
}
}
public static void copyRow(HSSFSheet srcSheet, HSSFSheet destSheet, HSSFRow srcRow, HSSFRow destRow,
Map<Integer, HSSFCellStyle> styleMap) {
Set<CellRangeAddress> mergedRegions = new TreeSet<CellRangeAddress>();
destRow.setHeight(srcRow.getHeight());
for (int j = srcRow.getFirstCellNum(); j <= srcRow.getLastCellNum(); j++) {
HSSFCell oldCell = srcRow.getCell(j);
HSSFCell newCell = destRow.getCell(j);
if (oldCell != null) {
if (newCell == null) {
newCell = destRow.createCell(j);
}
copyCell(oldCell, newCell, styleMap);
CellRangeAddress mergedRegion = getMergedRegion(srcSheet, srcRow.getRowNum(),
(short) oldCell.getColumnIndex());
if (mergedRegion != null) {
CellRangeAddress newMergedRegion = new CellRangeAddress(mergedRegion.getFirstRow(),
mergedRegion.getFirstColumn(), mergedRegion.getLastRow(), mergedRegion.getLastColumn());
if (isNewMergedRegion(newMergedRegion, mergedRegions)) {
mergedRegions.add(newMergedRegion);
destSheet.addMergedRegion(newMergedRegion);
}
}
}
}
}
public static void copyCell(HSSFCell oldCell, HSSFCell newCell, Map<Integer, HSSFCellStyle> styleMap) {
if (styleMap != null) {
if (oldCell.getSheet().getWorkbook() == newCell.getSheet().getWorkbook()) {
newCell.setCellStyle(oldCell.getCellStyle());
} else {
int stHashCode = oldCell.getCellStyle().hashCode();
HSSFCellStyle newCellStyle = styleMap.get(stHashCode);
if (newCellStyle == null) {
newCellStyle = newCell.getSheet().getWorkbook().createCellStyle();
newCellStyle.cloneStyleFrom(oldCell.getCellStyle());
styleMap.put(stHashCode, newCellStyle);
}
newCell.setCellStyle(newCellStyle);
}
}
switch (oldCell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
newCell.setCellValue(oldCell.getStringCellValue());
break;
case HSSFCell.CELL_TYPE_NUMERIC:
newCell.setCellValue(oldCell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_BLANK:
newCell.setCellType(HSSFCell.CELL_TYPE_BLANK);
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
newCell.setCellValue(oldCell.getBooleanCellValue());
break;
case HSSFCell.CELL_TYPE_ERROR:
newCell.setCellErrorValue(oldCell.getErrorCellValue());
break;
case HSSFCell.CELL_TYPE_FORMULA:
newCell.setCellFormula(oldCell.getCellFormula());
break;
default:
break;
}
}
public static CellRangeAddress getMergedRegion(HSSFSheet sheet, int rowNum, short cellNum) {
for (int i = 0; i < sheet.getNumMergedRegions(); i++) {
CellRangeAddress merged = sheet.getMergedRegion(i);
if (merged.isInRange(rowNum, cellNum)) {
return merged;
}
}
return null;
}
private static boolean isNewMergedRegion(CellRangeAddress newMergedRegion,
Collection<CellRangeAddress> mergedRegions) {
return !mergedRegions.contains(newMergedRegion);
}
}
执行此代码时，我收到以下错误： -
Exception in thread "main" java.lang.ClassCastException: org.apache.poi.ss.util.CellRangeAddress cannot be cast to java.lang.Comparable
at java.util.TreeMap.getEntry(TreeMap.java:349)
at java.util.TreeMap.containsKey(TreeMap.java:232)
at java.util.TreeSet.contains(TreeSet.java:234)
at com.ge.dwf.windresource.util.Util.isNewMergedRegion(Util.java:157)
at com.ge.dwf.windresource.util.Util.copyRow(Util.java:95)
at com.ge.dwf.windresource.util.Util.copySheets(Util.java:67)
at com.ge.dwf.windresource.util.Util.main(Util.java:36)
任何人都可以帮助我知道我在哪里做错了吗？任何帮助都将受到高度赞赏。
我想逐页复制excel数据，因为我的原始Excel工作表包含我在复制详细信息时要删除的图表和其他图表。