动态Excel表导出
请问谁有动态excel表导出步骤，谢谢分享一下。就是列名有一个是动态的，它可能是一个也可能是多个，名字更不想同？
[解决办法]
不需要模板，只要准备好数据，调用一下reportExcel这个方法就能生成Excel，真的很方便哦

package com.test;

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Colour;
import jxl.format.UnderlineStyle;
import jxl.write.Label;
import jxl.write.Number;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

/**
 * 生成excel的工具类，不用模板
 * @version 2.0
 * */
public class ExportExcel {

private static ExportExcel bean = new ExportExcel();
public static ExportExcel getBean() {
return bean;
}

private FileOutputStream output;
private WritableWorkbook book;

/**
 * 导出excel生成文件
 * @param base 根目录(文件存放的目录)
 * @param fileName 文件名
 * @param fullDatas 要导出的数据(这里必须存放String类型的数组)
 * @param title 文件的标题(第一行)
 * @param coteWidths 每一列的宽度
 * @param titles 表头标题
 * @param numCote 需要数字格式化的列的索引
 * @return String 返回输出文件的物理路径
 * */
@SuppressWarnings("unchecked")
public String reportExcel(String base, String fileName, List fullDatas, 
String title, int[] coteWidths, String[] titles, int[] numCote) {
try {
createFolder(base);//如果文件夹不存在就创建
String filePath = base + fileName;//输出文件路径
WritableCellFormat cellFormat = new WritableCellFormat();
    cellFormat.setAlignment(Alignment.CENTRE);//居中显示
WritableSheet sheet = getExcel(filePath, title, coteWidths, titles);//获得工作簿
if(null != sheet){
for(int i = 0; i < fullDatas.size(); i++){
String[] fullData = (String[]) fullDatas.get(i);
if(fullData.length == coteWidths.length){//确保数据个数一致
for (int j = 0; j < fullData.length; j++) {
boolean isNumeric = false;//判断该列是否需要数字化格式
if(null != numCote && numCote.length > 0){
for(int c = 0; c < numCote.length; c++){
if(j == numCote[c]){
isNumeric = true;
break;
}
}
}
if(isNumeric){
Double numeric = Double.parseDouble(fullData[j]);
Number number = new Number(j, i + 2, numeric, cellFormat);
sheet.addCell(number);//数字格式化
}else {
Label label = new Label(j, i + 2, fullData[j], cellFormat);
sheet.addCell(label);//文本数据
}
}
}
}
}
book.write();
book.close();
output.close();
return filePath;
} catch (Exception e) {
e.printStackTrace(); 
 
}
return "";
}

// 生产excel工作簿
private WritableSheet getExcel(String filePath, String title, int coteWidths[], String[] titles) {
try {
if(coteWidths.length != titles.length){
return null;
}
output = new FileOutputStream(filePath);//文件输出流
book = Workbook.createWorkbook(output); // 创建文件
WritableSheet sheet = book.createSheet("sheet", 0); // 创建工作薄
//标题样式
WritableFont headFont = new WritableFont(
WritableFont.ARIAL, 15, WritableFont.BOLD, false,
UnderlineStyle.NO_UNDERLINE, Colour.BLACK);
WritableCellFormat headCellFormat = new WritableCellFormat(headFont);
headCellFormat.setAlignment(Alignment.CENTRE);//居中显示
//表头样式
WritableFont titleFont = new WritableFont(
WritableFont.ARIAL, 11, WritableFont.BOLD, false,
UnderlineStyle.NO_UNDERLINE, Colour.BLACK);
WritableCellFormat titleCellFormat = new WritableCellFormat(titleFont);
titleCellFormat.setAlignment(Alignment.CENTRE);
// 设置标题
sheet.mergeCells(0, 0, titles.length - 1, 0);//合并单元格
Label label = new Label(0, 0, title ,headCellFormat);
sheet.addCell(label);//标题
// 设置表头
for (int i = 0; i < coteWidths.length; i++) {
sheet.setColumnView(i, coteWidths[i]); // 设置列的宽度
Label label1 = new Label(i, 1, titles[i], titleCellFormat);
sheet.addCell(label1);//表头标题
}
return sheet;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

// 创建文件夹
public void createFolder(String folderPath) {
try {
File folder = new File(folderPath);
if (!folder.exists()) {
folder.mkdirs();
}
} catch (Exception e) {
e.printStackTrace();
}
}

@SuppressWarnings("unchecked")
public static void main(String[] args) {
String base = "D:\\opt\\log\\", fileName = "student.xls", title= "学生成绩表";
String[] titles = new String[]{ "学号", "姓名", "语文", "数学", "排名" };
int[] coteWidths = new int[]{ 20, 30, 20, 20, 20 };
int[] numCote = new int[]{ 0, 2, 3, 4 };
List list = new ArrayList();
for (int i = 1; i <= numCote.length; i++) {
list.add(new String[]{ "201000" + i, i + "号学生", String.valueOf(100 - i), String.valueOf(95 - i), String.valueOf(i) });
}
System.out.println(ExportExcel.getBean().reportExcel(base, fileName, list, title, coteWidths, titles, numCote));
}

}