Java 导出 excel 有多个sheet

转自于https://blog.csdn.net/fk478561641/article/details/80863744，如有侵权立即删除

package com.sszt.zwfw.statisticalanalysis.service;
 
import java.io.OutputStream;
import java.util.List;
 
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
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.hssf.util.HSSFColor;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
 
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 
public class test {
 
	/**
	 * @Title: exportExcel
	 * @Description: 导出Excel的方法
	 * @author: evan @ 2014-01-09 
	 * @param workbook 
	 * @param sheetNum (sheet的位置，0表示第一个表格中的第一个sheet)
	 * @param sheetTitle  （sheet的名称）
	 * @param headers    （表格的标题）
	 * @param result   （表格的数据）
	 * @param out  （输出流）
	 * @throws Exception
	 */
	public void exportExcel(HSSFWorkbook workbook, int sheetNum,
			String sheetTitle, String[] headers, List<List<String>> result,
			OutputStream out) throws Exception {
		// 生成一个表格
		HSSFSheet sheet = workbook.createSheet();
		workbook.setSheetName(sheetNum, sheetTitle);
		// 设置表格默认列宽度为20个字节
		sheet.setDefaultColumnWidth((short) 20);
		// 生成一个样式
		HSSFCellStyle style = workbook.createCellStyle();
		// 设置这些样式
		style.setFillForegroundColor(HSSFColor.PALE_BLUE.index);
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		// 生成一个字体
		HSSFFont font = workbook.createFont();
		font.setColor(HSSFColor.BLACK.index);
		font.setFontHeightInPoints((short) 12);
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		// 把字体应用到当前的样式
		style.setFont(font);
 
		// 指定当单元格内容显示不下时自动换行
		style.setWrapText(true);
 
		// 产生表格标题行
		HSSFRow row = sheet.createRow(0);
		for (int i = 0; i < headers.length; i++) {
			HSSFCell cell = row.createCell((short) i);
		
			cell.setCellStyle(style);
			HSSFRichTextString text = new HSSFRichTextString(headers[i]);
			cell.setCellValue(text.toString());
		}
		// 遍历集合数据，产生数据行
		if (result != null) {
			int index = 1;
			for (List<String> m : result) {
				row = sheet.createRow(index);
				int cellIndex = 0;
				for (String str : m) {
					HSSFCell cell = row.createCell((short) cellIndex);
					cell.setCellValue(str.toString());
					cellIndex++;
				}
				index++;
			}
		}
	}
	@SuppressWarnings("unchecked")
	public static void main(String[] args) {
		try {
			OutputStream out = new FileOutputStream("D:\\test.xls");
			List<List<String>> data = new ArrayList<List<String>>();
			for (int i = 1; i < 5; i++) {
				List rowData = new ArrayList();
				rowData.add(String.valueOf(i));
				rowData.add("东霖柏鸿"+i);
				data.add(rowData);
			}
			String[] headers = { "ID", "用户名" };
			test eeu = new test();
			HSSFWorkbook workbook = new HSSFWorkbook();
			eeu.exportExcel(workbook, 0, "上海", headers, data, out);
			eeu.exportExcel(workbook, 1, "深圳", headers, data, out);
			eeu.exportExcel(workbook, 2, "广州", headers, data, out);
			//原理就是将所有的数据一起写入，然后再关闭输入流。
			workbook.write(out);
			out.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}