Web框架為Struts2,所用jar包如下：

ExportExcelAction.java

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
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.HSSFRow;
import
 
 org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.Region;


public class ExportExcelAction {

    private InputStream inputStream;

    public String export() {
        try {
            HSSFWorkbook wb = new
 
 HSSFWorkbook();
            HSSFSheet sheet = wb.createSheet("new sheet");
            sheet.setDefaultColumnWidth(20); // 默認列寬

            HSSFFont font = wb.createFont();
            font.setFontName("黑體");
            font.setFontHeightInPoints((short) 13);// 設置字體大小
            font.setColor(HSSFColor.WHITE.index); //字體顏色
 


            HSSFCellStyle headStyle = wb.createCellStyle(); // 頭部樣式
            headStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 水平居中
            headStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 下邊框
            headStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);// 左邊框
            headStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);// 上邊框
            headStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);// 右邊框
            headStyle.setFillForegroundColor(HSSFColor.TEAL.index);// 設置背景色
            headStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
            headStyle.setFont(font);// 選擇需要用到的字體格式

            HSSFCellStyle contentStyle = wb.createCellStyle(); // 內容樣式
            contentStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 下邊框
            contentStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);// 左邊框
            contentStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);// 上邊框
            contentStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);// 右邊框

            HSSFRow row_h = sheet.createRow((short) 0);
            HSSFCell ch = row_h.createCell(0);
            ch.setCellValue("測試導出Excel");
            ch.setCellStyle(headStyle);
            sheet.addMergedRegion(new Region(0, (short) 0, 0, (short) 2));// 指定合並區域

            //表頭
            HSSFRow row1 = sheet.createRow((short) 1);
            HSSFCell cell_1_0 = row1.createCell(0);
            cell_1_0.setCellValue("姓名");
            cell_1_0.setCellStyle(headStyle);

            HSSFCell cell_1_1 = row1.createCell(1);
            cell_1_1.setCellValue("出生日期");
            cell_1_1.setCellStyle(headStyle);

            HSSFCell cell_1_2 = row1.createCell(2);
            cell_1_2.setCellValue("住址");
            cell_1_2.setCellStyle(headStyle);

            //內容
            HSSFRow row2 = sheet.createRow(2);
            HSSFCell cell_2_0 = row2.createCell(0);
            cell_2_0.setCellValue("itmyhome");
            cell_2_0.setCellStyle(contentStyle);

            HSSFCell cell_2_1 = row2.createCell(1);
            cell_2_1.setCellValue("1990-05-01");
            cell_2_1.setCellStyle(contentStyle);

            HSSFCell cell_2_2 = row2.createCell(2);
            cell_2_2.setCellValue("北京市昌平區");
            cell_2_2.setCellStyle(contentStyle);


            FileOutputStream fileOut = new FileOutputStream("d:/mysheet.xls"); //導出路徑
            wb.write(fileOut);
            fileOut.close();

            inputStream = new FileInputStream("d:/mysheet.xls"); //下載

        } catch (Exception e) {
            e.printStackTrace();
        }
        return "success";
    }

    public InputStream getInputStream() {
        return inputStream;
    }

    public void setInputStream(InputStream inputStream) {
        this.inputStream = inputStream;
    }
}

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struts.xml

<!DOCTYPE struts PUBLIC 
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="json_code" extends="json-default">
        <!-- 導出報表 -->
        <action name="exportExcelAction" method="export"
            class="com.itmyhome.ExportExcelAction">
            <result type="stream">
                <param name="contentType">application/octet-stream</param>
                <param name="inputName">inputStream</param>
                <param name="contentDisposition">attachment;filename="export.xls"</param>
                <param name="bufferSize">4096</param>
            </result>
        </action>
    </package>
    <package name="build" extends="struts-default">
        <action name="login" method="login" class="com.itmyhome.Login">
            <result name="success">index.jsp</result>
        </action>
    </package>
</struts>

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導出Excel如圖：

作者：itmyhome
源碼：download

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Java實現POI導出Excel