`

【转】struts2中POI在内存中生成文件并下载

    博客分类：
  • poi
StrutsApacheJavaExcelXML 
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<%@ page contentType="text/html; charset=gbk" %>
<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
<a href="excel.action">下载文件</a>
</html>


struts.xml文件
文件内容： 
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <package name="default" extends="struts-default">
        <action name="excel" class="ExcelDownloadAction">
            <result name="success" type="stream">
                <param name="contentType">application/vnd.ms-excel</param>
                <param name="contentDisposition">attachment;filename="AllUsers.xls"</param>
                <param name="inputName">excelFile</param>
            </result>
        </action>
    </package>
</struts>



import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class ExcelDownloadAction extends ActionSupport {

    public InputStream getExcelFile() {
        HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFSheet sheet = workbook.createSheet("sheet1");
        {
            // 创建表头
            HSSFRow row = sheet.createRow(0);
            HSSFCell cell = row.createCell((short) 0);
            cell.setCellValue("id");
            cell = row.createCell((short) 1);
            cell.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
            cell.setCellValue("姓");
            cell = row.createCell((short) 2);
            cell.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
            cell.setCellValue("名");
            cell = row.createCell((short) 3);
            cell.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
            cell.setCellValue("年龄");

            // 创建数据
            // 第一行
            row = sheet.createRow(1);
            cell = row.createCell((short) 0);
            cell.setCellValue("1");
            cell = row.createCell((short) 1);
            cell.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
            cell.setCellValue("张");
            cell = row.createCell((short) 2);
            cell.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
            cell.setCellValue("四");
            cell = row.createCell((short) 3);
            cell.setCellValue("23");

            // 第二行
            row = sheet.createRow(2);
            cell = row.createCell((short) 0);
            cell.setCellValue("2");
            cell = row.createCell((short) 1);
            cell.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
            cell.setCellValue("李");
            cell = row.createCell((short) 2);
            cell.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
            cell.setCellValue("六");
            cell = row.createCell((short) 3);
            cell.setCellValue("30");
        }

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try {
            workbook.write(baos);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        byte[] ba = baos.toByteArray();
        ByteArrayInputStream bais = new ByteArrayInputStream(ba);
        return bais;

    }

    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        return super.execute();
    }

}


本文出自:http://kin111.blog.51cto.com/738881/167727
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