操作Excel工具类（基于Apache的POI类库）
上一篇介绍的是基于jxl.jar的操作Excel工具类，但是jxl.jar的licence限制了它不能用于商业项目，所以本篇介绍Apache的POI类库。上篇文章在这里
操作Excel工具类（基于jxl.jar）
功能简介：
1、向Excel文档插入数据，可以是多行可以是多列，保留原单元格格式不变
2、向Excel文档插入一个新行，并且使用与上一行完全相同的格式
3、等等
需要的第三方JAR包：
poi-3.8-20120326.jar
poi-examples-3.8-20120326.jar
poi-excelant-3.8-20120326.jar
poi-ooxml-3.8-20120326.jar
poi-ooxml-schemas-3.8-20120326.jar
poi-scratchpad-3.8-20120326.jar
stax-api-1.0.1.jar
完整的工具类的代码如下：
感谢gegewuqin9和在世界的中心呼喚愛在回复中建议，对读取单元格值的地方做了修改。
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
/**
* Excel工具类
*
* <pre>
* 基于Apache的POI类库
* </pre>
*
* @author 陈峰
*/
public class POIExcelMakerUtil {
private File excelFile;
private InputStream fileInStream;
private Workbook workBook;
public POIExcelMakerUtil(File file) throws Exception {
this.excelFile = file;
this.fileInStream = new FileInputStream(this.excelFile);
this.workBook = WorkbookFactory.create(this.fileInStream);
}
/**
* 写入一组值
*
* @param sheetNum
* 写入的sheet的编号
* @param fillRow
* 是写入行还是写入列
* @param startRowNum
* 开始行号
* @param startColumnNum
* 开始列号
* @param contents
* 写入的内容数组
* @throws Exception
*/
public void writeArrayToExcel(int sheetNum, boolean fillRow,
int startRowNum, int startColumnNum, Object[] contents)
throws Exception {
Sheet sheet = this.workBook.getSheetAt(sheetNum);
writeArrayToExcel(sheet, fillRow, startRowNum, startColumnNum, contents);
}
/**
* 写入一组值
*
* @param sheetNum
* 写入的sheet的名称
* @param fillRow
* 是写入行还是写入列
* @param startRowNum
* 开始行号
* @param startColumnNum
* 开始列号
* @param contents
* 写入的内容数组
* @throws Exception
*/
public void writeArrayToExcel(String sheetName, boolean fillRow,
int startRowNum, int startColumnNum, Object[] contents)
throws Exception {
Sheet sheet = this.workBook.getSheet(sheetName);
writeArrayToExcel(sheet, fillRow, startRowNum, startColumnNum, contents);
}
private void writeArrayToExcel(Sheet sheet, boolean fillRow,
int startRowNum, int startColumnNum, Object[] contents)
throws Exception {
for (int i = 0, length = contents.length; i < length; i++) {
int rowNum;
int columnNum;
// 以行为单位写入
if (fillRow) {
rowNum = startRowNum;
columnNum = startColumnNum + i;
}
// 以列为单位写入
else {
rowNum = startRowNum + i;
columnNum = startColumnNum;
}
this.writeToCell(sheet, rowNum, columnNum,
convertString(contents));
}
}
/**
* 向一个单元格写入值
*
* @param sheetNum
* sheet的编号
* @param rowNum
* 行号
* @param columnNum
* 列号
* @param value
* 写入的值
* @throws Exception
*/
public void writeToExcel(int sheetNum, int rowNum, int columnNum,
Object value) throws Exception {
Sheet sheet = this.workBook.getSheetAt(sheetNum);
this.writeToCell(sheet, rowNum, columnNum, value);
}
/**
* 向一个单元格写入值
*
* @param sheetName
* sheet的名称
* @param columnRowNum
* 单元格的位置
* @param value
* 写入的值
* @throws Exception
*/
public void writeToExcel(String sheetName, int rowNum, int columnNum,
Object value) throws Exception {
Sheet sheet = this.workBook.getSheet(sheetName);
this.writeToCell(sheet, rowNum, columnNum, value);
}
/**
* 向一个单元格写入值
*
* @param sheetNum
* sheet的编号
* @param columnRowNum
* 单元格的位置
* @param value
* 写入的值
* @throws Exception
*/
public void writeToExcel(int sheetNum, String columnRowNum, Object value)
throws Exception {
Sheet sheet = this.workBook.getSheetAt(sheetNum);
this.writeToCell(sheet, columnRowNum, value);
}
/**
* 向一个单元格写入值
*
* @param sheetNum
* sheet的名称
* @param columnRowNum
* 单元格的位置
* @param value
* 写入的值
* @throws Exception
*/
public void writeToExcel(String sheetName, String columnRowNum, Object value)
throws Exception {
Sheet sheet = this.workBook.getSheet(sheetName);
this.writeToCell(sheet, columnRowNum, value);
}
private void writeToCell(Sheet sheet, String columnRowNum, Object value)
throws Exception {
int[] rowNumColumnNum = convertToRowNumColumnNum(columnRowNum);
int rowNum = rowNumColumnNum;
int columnNum = rowNumColumnNum;
this.writeToCell(sheet, rowNum, columnNum, value);
}
/**
* 将单元格的行列位置转换为行号和列号
*
* @param columnRowNum
* 行列位置
* @return 长度为2的数组，第1位为行号，第2位为列号
*/
private static int[] convertToRowNumColumnNum(String columnRowNum) {
columnRowNum = columnRowNum.toUpperCase();
char[] chars = columnRowNum.toCharArray();
int rowNum = 0;
int columnNum = 0;
for (char c : chars) {
if ((c >= 'A' && c <= 'Z')) {
columnNum = columnNum * 26 + ((int) c - 64);
} else {
rowNum = rowNum * 10 + new Integer(c + "");
}
}
return new int[] { rowNum - 1, columnNum - 1 };
}
private void writeToCell(Sheet sheet, int rowNum, int columnNum,
Object value) throws Exception {
Row row = sheet.getRow(rowNum);
Cell cell = row.getCell(columnNum);
if (cell == null) {
cell = row.createCell(columnNum);
}
cell.setCellValue(convertString(value));
}
/**
* 读取一个单元格的值
*
* @param sheetName
* sheet的名称
* @param columnRowNum
* 单元格的位置
* @return
* @throws Exception
*/
public Object readCellValue(String sheetName, String columnRowNum)
throws Exception {
Sheet sheet = this.workBook.getSheet(sheetName);
int[] rowNumColumnNum = convertToRowNumColumnNum(columnRowNum);
int rowNum = rowNumColumnNum;
int columnNum = rowNumColumnNum;
Row row = sheet.getRow(rowNum);
if (row != null) {
Cell cell = row.getCell(columnNum);
if (cell != null) {
return getCellValue(cell);
}
}
return null;
}
/**
* 获取单元格中的值
*
* @param cell 单元格
* @return
*/
private static Object getCellValue(Cell cell) {
int type = cell.getCellType();
switch (type) {
case Cell.CELL_TYPE_STRING:
return (Object) cell.getStringCellValue();
case Cell.CELL_TYPE_NUMERIC:
Double value = cell.getNumericCellValue();
return (Object) (value.intValue());
case Cell.CELL_TYPE_BOOLEAN:
return (Object) cell.getBooleanCellValue();
case Cell.CELL_TYPE_FORMULA:
return (Object) cell.getArrayFormulaRange().formatAsString();
case Cell.CELL_TYPE_BLANK:
return (Object) "";
default:
return null;
}
}
/**
* 插入一行并参照与上一行相同的格式
*
* @param sheetNum
* sheet的编号
* @param rowNum
* 插入行的位置
* @throws Exception
*/
public void insertRowWithFormat(int sheetNum, int rowNum) throws Exception {
Sheet sheet = this.workBook.getSheetAt(sheetNum);
insertRowWithFormat(sheet, rowNum);
}
/**
* 插入一行并参照与上一行相同的格式
*
* @param sheetName
* sheet的名称
* @param rowNum
* 插入行的位置
* @throws Exception
*/
public void insertRowWithFormat(String sheetName, int rowNum)
throws Exception {
Sheet sheet = this.workBook.getSheet(sheetName);
insertRowWithFormat(sheet, rowNum);
}
private void insertRowWithFormat(Sheet sheet, int rowNum) throws Exception {
sheet.shiftRows(rowNum, rowNum + 1, 1);
Row newRow = sheet.createRow(rowNum);
Row oldRow = sheet.getRow(rowNum - 1);
for (int i = oldRow.getFirstCellNum(); i < oldRow.getLastCellNum(); i++) {
Cell oldCell = oldRow.getCell(i);
if (oldCell != null) {
CellStyle cellStyle = oldCell.getCellStyle();
newRow.createCell(i).setCellStyle(cellStyle);
}
}
}
/**
* 重命名一个sheet
*
* @param sheetNum
* sheet的编号
* @param newName
* 新的名称
*/
public void renameSheet(int sheetNum, String newName) {
this.workBook.setSheetName(sheetNum, newName);
}
/**
* 重命名一个sheet
*
* @param oldName
* 旧的名称
* @param newName
* 新的名称
*/
public void renameSheet(String oldName, String newName) {
int sheetNum = this.workBook.getSheetIndex(oldName);
this.renameSheet(sheetNum, newName);
}
/**
* 删除一个sheet
*
* @param sheetName
* sheet的名称
*/
public void removeSheet(String sheetName) {
this.workBook.removeSheetAt(this.workBook.getSheetIndex(sheetName));
}
/**
* 写入Excel文件并关闭
*/
public void writeAndClose() {
if (this.workBook != null) {
try {
FileOutputStream fileOutStream = new FileOutputStream(
this.excelFile);
this.workBook.write(fileOutStream);
if (fileOutStream != null) {
fileOutStream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
if (this.fileInStream != null) {
try {
this.fileInStream.close();
} catch (Exception e) {
}
}
}
private static String convertString(Object value) {
if (value == null) {
return "";
} else {
return value.toString();
}
}
}
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