示例代码：
package com.wlex.xxx.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;
import jxl.Cell;
import jxl.CellType;
import jxl.DateCell;
import jxl.LabelCell;
import jxl.NumberCell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.biff.DisplayFormat;
import jxl.biff.EmptyCell;
import jxl.biff.drawing.Drawing;
import jxl.format.UnderlineStyle;
import jxl.read.biff.BiffException;
import jxl.write.Blank;
import jxl.write.DateFormat;
import jxl.write.Label;
import jxl.write.Number;
import jxl.write.NumberFormats;
import jxl.write.WritableCell;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableImage;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;
public class ExcelHelper {
public static void main(String[] args) {
//创建excel示例
testCreateExcel(new File("C:\\tmp1.xls"));
System.out.println("----------------第一次读入-----------------");
//读入excel例子
testReadExcel(new File("C:\\tmp1.xls"));
//修改excel示例
testUpdateExcel(new File("C:\\tmp1.xls"));
System.out.println("----------------第二次读入-----------------");
//读入excel例子
testReadExcel(new File("C:\\tmp1.xls"));
}
//读入excel文件工作表内容
public static List<List<String>> readExcel(InputStream is) {
List<List<String>> result = new ArrayList<List<String>>();
try {
Workbook rwb = Workbook.getWorkbook(is);
Sheet st = rwb.getSheet(0);
//Sheet st = rwb.getSheet("投资信息");
int rs = st.getColumns();
int rows = st.getRows();
//遍历行
for (int k = 0; k < rows; k++) {
List<String> list = new ArrayList<String>();
//遍历列
for (int i = 0; i < rs; i++) {
Cell cell = st.getCell(i, k);
String cellValue = getCellValue(cell);
list.add(cellValue);
}
result.add(list);
}
rwb.close();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
//根据单元格类型取值
protected static String getCellValue(Cell cell) {
String result = cell.getContents();
CellType cellType = cell.getType();
if (cellType == CellType.LABEL) {
LabelCell labelc00 = (LabelCell) cell;
result = labelc00.getString();
} else if (cellType == CellType.DATE) {
DateCell dc = (DateCell) cell;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
result = sdf.format(dc.getDate());
} else if (cell.getType() == CellType.NUMBER || cell.getType() == CellType.NUMBER_FORMULA) {
NumberCell nc = (NumberCell) cell;
result = new BigDecimal(nc.getValue()).toString();
}
return result;
}
//读入excel例子
public static void testReadExcel(File file){
InputStream is;
try {
is = new FileInputStream(file);
List<List<String>> result = ExcelHelper.readExcel(is);
for (List<String> row : result) {
for (Object object : row) {
System.out.print(object + "\t\t");
}
System.out.println();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
//创建excel例子
public static void testCreateExcel(File file) {
try {
OutputStream os = new FileOutputStream(file);
WritableWorkbook wwb = Workbook.createWorkbook(os);
WritableSheet ws = wwb.createSheet("工作表1", 0);
//列头(第一行信息，行索引是0，列索引分别是0,1,2,3)
ws.addCell(new Label(0, 0, "姓名"));
ws.addCell(new Label(1, 0, "年龄"));
ws.addCell(new Label(2, 0, "性别"));
//对单元格进行字体颜色设置
WritableFont wfc = new WritableFont(WritableFont.COURIER, 10, WritableFont.BOLD, false, UnderlineStyle.SINGLE, jxl.format.Colour.RED);
ws.addCell(new Label(3, 0, "投资总额", new WritableCellFormat(wfc)));
String[] nameArr = new String[]{"张三", "李四", "王五"};
for(int i = 0; i < 3; i++) {
ws.addCell(new Label(0, i+1, nameArr[i]));
ws.addCell(new Number(1, i+1, new Double((new Random()).nextInt(100))));
ws.addCell(new Label(2, i+1, "男"));
//定义投资额单元格的显示格式
DisplayFormat df = NumberFormats.FLOAT;
WritableCellFormat wcf = new WritableCellFormat(df);
double loanAmt = (new Random()).nextInt(10000);
BigDecimal bd = new BigDecimal(loanAmt).setScale(2);
Number labelNF = new Number(3, i+1, bd.doubleValue(), wcf);
ws.addCell(labelNF);
}
//写入工作表
wwb.write();
wwb.close();
} catch (Exception e) {
e.printStackTrace();
}
}
//修改文件例子
public static void testUpdateExcel(File file) {
//更改第一个工作表，将第一行第一列单元格更改为“首列”
try {
InputStream is = new FileInputStream(file);
Workbook rbook = Workbook.getWorkbook(is);
WritableWorkbook wbook = Workbook.createWorkbook(file, rbook);
WritableSheet wSheet = wbook.getSheet(0);
WritableCell cell = wSheet.getWritableCell(0, 0);
WritableCell newCell = new Label(cell.getColumn(), cell.getRow(), "首列", cell.getCellFormat());
wSheet.addCell(newCell);
wbook.write();
wbook.close();
rbook.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (BiffException e) {
e.printStackTrace();
} catch (RowsExceededException e) {
e.printStackTrace();
} catch (WriteException e) {
e.printStackTrace();
}
}
//简单填充单元格封装
public static Cell createCell(String type, int c, int r, Object value) {
Cell result = new EmptyCell(c, r);
if(value != null) {
if ("label".equalsIgnoreCase(type)) {
result = new jxl.write.Label(c, r, value.toString());
} else if ("number".equalsIgnoreCase(type)) {
result = new jxl.write.Number(c, r, (Double) value);
} else if ("boolean".equalsIgnoreCase(type)) {
result = new jxl.write.Boolean(c, r, (java.lang.Boolean) value);
} else if ("date".equalsIgnoreCase(type)) {
DateFormat df = new jxl.write.DateFormat("yyyy-MM-dd HH:mm:ss");
WritableCellFormat wcf = new WritableCellFormat(df);
result = new jxl.write.DateTime(c, r, (Date) value, wcf);
} else {
result = new Blank(c, r);
}
}
return result;
}
//画图例子
protected static Drawing testCreateDrawing() {
//jxl包只支持png格式图片
File image = new File("C:\\img01.png");
//从列索引为0行索引为1的地方开始，宽度为2高度为3
WritableImage wrImage = new WritableImage(0, 1, 2, 3, image);
return wrImage;
}
}