struts2超链接生成Excel

一、类方法，需要使用poi-2.5.1.jar包：

/*
* 导出Excle文件
*/
public InputStream getInputStream() {
//=======================生成一个Excle模板============================
//生成一个对象，类似Excel
     HSSFWorkbook wb=new HSSFWorkbook();
     //生成一个sheet
     HSSFSheet sheet=wb.createSheet("sheet1");
     //生成一行
     HSSFRow row= sheet.createRow(0);
     //生成一个元格
     HSSFCell cell=row.createCell((short) 0);
     //设置字符集，以正常显示中文
     cell.setEncoding(HSSFCell.ENCODING_UTF_16);
     cell.setCellValue("序号");

     cell=row.createCell((short) 1);
     cell.setEncoding(HSSFCell.ENCODING_UTF_16);
     cell.setCellValue("姓");

     cell=row.createCell((short) 2);
     cell.setEncoding(HSSFCell.ENCODING_UTF_16);
     cell.setCellValue("名");

     cell=row.createCell((short) 3);
     cell.setEncoding(HSSFCell.ENCODING_UTF_16);
     cell.setCellValue("年龄");

     //从数据库获取记录
     List list=this.findUserAll();

     for (int i = 0; i < list.size(); i++) {
        Users user=list.get(i);

        row=sheet.createRow(i+1);

        cell=row.createCell((short) 0);
        cell.setEncoding(HSSFCell.ENCODING_UTF_16);
        cell.setCellValue(i+1);

        cell=row.createCell((short) 1);
        cell.setEncoding(HSSFCell.ENCODING_UTF_16);
        cell.setCellValue(user.getFirstname());

        cell=row.createCell((short) 2);
        cell.setEncoding(HSSFCell.ENCODING_UTF_16);
        cell.setCellValue(user.getLastname());

        cell=row.createCell((short) 3);
        cell.setEncoding(HSSFCell.ENCODING_UTF_16);
        cell.setCellValue(user.getAge());
     }

    //=====运用字节数组输出流和字节数组输入流导出Excle文件，直接在内存中操作，这样不会产生临时文件======
     ByteArrayOutputStream baos=new ByteArrayOutputStream();
     try {
        wb.write(baos);
     } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
     }
     byte[] content= baos.toByteArray();
     InputStream inputStream=new ByteArrayInputStream(content);
     return inputStream;
}

二、action

package com.qfx.action;
import java.io.InputStream;
import com.opensymphony.xwork2.ActionSupport;
import com.zpj.service.UserService;

public class WriteEceclAction extends ActionSupport {
    private UserService userService;
    public void setUserService(UserService userService) {
        this.userService = userService;
    }
    public InputStream getDownloadFile(){
        return this.userService.getInputStream();
    }
    @Override
    public String execute() throws Exception {
        return SUCCESS;
    }
}

三、struts.xml

 
    
     application/vnd.ms-excel
        
     attachment;filename="AllUser.xls"
     downloadFile
    
 

四、jsp页面

在线生成Excel