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  • POI导出简单案例

    代码如下:

    本文参考自:https://blog.csdn.net/m0_37681532/article/details/75252236

      1 package kklazy.api.controller;
      2 
      3 import java.io.FileNotFoundException;
      4 import java.io.FileOutputStream;
      5 import java.io.OutputStream;
      6 import java.util.ArrayList;
      7 import java.util.List;
      8 import org.apache.poi.hssf.usermodel.HSSFCell;
      9 import org.apache.poi.hssf.usermodel.HSSFCellStyle;
     10 import org.apache.poi.hssf.usermodel.HSSFFont;
     11 import org.apache.poi.hssf.usermodel.HSSFRow;
     12 import org.apache.poi.hssf.usermodel.HSSFSheet;
     13 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
     14 
     15 import kklazy.security.model.User;
     16 
     17 
     18 public class Excel {
     19     
     20     public static void main(String[] args) {
     21         exportExcel();
     22     }
     23     
     24     public static void   exportExcel(){
     25         FileOutputStream fos=null;
     26         try {
     27             //若文件地址在C盘:抛出异常:java.io.FileNotFoundException: C:bb.xls (拒绝访问。)————>可能原因:C盘权限问题
     28             fos = new FileOutputStream("D:\bbb.xls");
     29         } catch (FileNotFoundException e) {
     30             e.printStackTrace();
     31         }
     32         HSSFWorkbook wb = new HSSFWorkbook();
     33         HSSFSheet  sheet = wb.createSheet();
     34         wb.setSheetName(0, "我的工作簿1");//设置名字
     35         HSSFRow row  = sheet.createRow(0);//创建第一行
     36         //设置样式
     37         HSSFCellStyle style = wb.createCellStyle();
     38         style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//对齐方式
     39         //设置上下左右边框;
     40         style.setBorderTop(HSSFCellStyle.BORDER_THIN);
     41         style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
     42         style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
     43         style.setBorderRight(HSSFCellStyle.BORDER_THIN);
     44         //设置字体样式
     45         HSSFFont font = wb.createFont();
     46         font.setFontName("宋体");//设置字体名字
     47         font.setFontHeightInPoints((short)10);//设置字体大小
     48         font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);////设置字体加粗-正常(不加粗)HSSFFont.BOLDWEIGHT_BOLD:加粗
     49         style.setFont(font);
     50         //创建单元格,设置样式并赋值
     51         HSSFCell cell = row.createCell(0);
     52         cell.setCellStyle(style);
     53         cell.setCellValue("用户名");
     54         
     55         cell = row.createCell(1);
     56         cell.setCellStyle(style);
     57         cell.setCellValue("密码");
     58         List<User> list = new Excel().getUsers();//得到查询数据(模拟数据库查询)
     59         for(int i=1;i<=list.size();i++){
     60             row = sheet.createRow(i);
     61             User user = list.get(i-1);
     62             cell = row.createCell(0);//创建单元格  先设置样式、编码,然后再置值。
     63             cell.setCellValue(user.getUsername());
     64 
     65             cell = row.createCell(1);
     66             cell.setCellValue(user.getPassword());
     67 
     68         }
     69         
     70         try {
     71             wb.write(fos);
     72             fos.close();
     73         } catch (Exception e) {
     74             e.printStackTrace();
     75         }
     76         
     77         
     78     }
     79     
     80     public List<User> getUsers(){
     81         List<User> users = new ArrayList<User>();
     82         User u = new User();
     83         u.setUsername("whh");
     84         u.setPassword("123456");
     85         User u1 = new User();
     86         u1.setUsername("lily");
     87         u1.setPassword("1234");
     88         users.add(u);
     89         users.add(u1);
     90         return users;
     91         }
     92     
     93     //若要在页面下载,输出流必须通过response获取,并传送到前台下载:
     94     /*
     95      * response.setContentType("application/octet-stream;charset=UTF-8");
     96      * response.setHeader("Content-Disposition",
     97             "attachment; filename=" + java.net.URLEncoder.encode(reportName+ ".xls", "UTF-8"));
     98      * OutputStream out = response.getOutputStream();
     99      * wb.write(out);//写出文件
    100      * out.flush();
    101      * out.close();
    102      * */
    103 }

    备注:若要在页面下载,输出流必须通过response获取,并传送到前台下载:

    response.setContentType("application/octet-stream;charset=UTF-8");
    response.setHeader("Content-Disposition",
     "attachment; filename=" + java.net.URLEncoder.encode(reportName+ ".xls", "UTF-8"));
     OutputStream out = response.getOutputStream();
     wb.write(out);//写出文件
    out.flush();
    out.close();

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  • 原文地址:https://www.cnblogs.com/whhjava/p/9505928.html
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