java利用poi实现excel导出

小灰灰 2022-10-13 14:54 241阅读 0赞

依赖

<dependency>
                <groupId>org.apache.poi</groupId>
                <artifactId>poi</artifactId>
                <version>3.15</version>
                <scope>compile</scope>
            </dependency>

工具类

import org.apache.poi.hssf.usermodel.*;
    
    import java.io.*;
    import java.util.ArrayList;
    import java.util.List;
    
    public class ExcelUtils {
    
        /*title 标题 headers 头列属性 list为数据集合 out 输入流*/
        public static boolean  exportMessageExcelFile(String title, String[] headers, List dossierList, OutputStream out)
        {
            boolean flag = true;
            // 声明一个工作薄
            HSSFWorkbook workbook = new HSSFWorkbook();
            // 生成一个表格
            HSSFSheet sheet = workbook.createSheet(title);
            // 设置表格默认列宽度为15个字节
            sheet.setDefaultColumnWidth((short) 15);
           
            //产生表格标题行
            HSSFRow row = sheet.createRow(0);
            for (short i = 0; i < headers.length; i++) {
                HSSFCell cell = row.createCell(i);
                cell.setCellStyle(style);
                HSSFRichTextString text = new HSSFRichTextString(headers[i]);
                cell.setCellValue(text);
            }
            for(int i = 0; i< dossierList.size();i++)
            {
                Object obj = (Object) dossierList.get(i);
                row = sheet.createRow(i+1);//创建第1行
                for (int j = 0; j < headers.length; j++) {
                    HSSFCell cell = row.createCell(j);//创建第一行的第一个属性列
                    cell.setCellStyle(style);
                    switch (j){
                    //根据你头定义的表格样式填充具体数据
                        case 0:
                            cell.setCellValue(obj.getBuyerNo());
                            break;
                        case 1:
                            cell.setCellValue(obj.UserName());
                            break;
                        case 2:
                            cell.setCellValue(obj.getVirtualAccountNo());
                            break;
                        case 3:
                            cell.setCellValue(obj.getExpiryDate());
                            break;
                        case 4:
                            cell.setCellValue(DateUtil.formatDate(obj.getCreateDate(),"yyyy-MM-dd hh:mm:ss"));
                            break;
                        case 5:
                            cell.setCellValue(obj.getSpendLimitAmount());
                            break;
                    }
                }
            }
            try {
                workbook.write(out);
            } catch (IOException e) {
                e.printStackTrace();
                flag = false;
            }finally {
                //清理资源
                try {
                    if(out != null)
                    {
                        out.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
    
            return flag;
        }