使用poi導出execl

使用poi須要用到的jar包

 

本文的導出基於execl的模板導出，在大部分表頭固定而格式花樣比較複雜的建議使用本文介紹的方法（表頭固定，只須要填充值）

 

一、在webroot目錄下新建report文件夾來存放模板execl文件

二、jsp前臺請求對應的action代碼

 

String path = request.getSession().getServletContext().getRealPath("/")+"report/goodslaunch.xls";
String id = request.getParameter("id");//須要導出的數據的某Id
String name = this.xxService.loadNameById(id);//查詢出id對應的真實名稱

ByteArrayOutputStream os = (ByteArrayOutputStream)this.xxxService.expExecl(id, path);
if(null!=os && os.size()>0){
    byte[] buffer = os.toByteArray();
    
    String fileName = "[" + name + "]XX模塊." + path.substring(path.lastIndexOf(".")+1, path.length());
    // 設置response的Header
    response.setContentType("application/x-msdownload; charset=UTF-8");  
    response.addHeader("content-type", "application/x-msexcel");  
    response.addHeader("content-disposition", "attachment; filename="+ new String(fileName.getBytes("gb2312"), "iso8859-1"));  //這裏必須轉碼，或者會有問題
    response.setContentLength(buffer.length);  
    
    OutputStream out = response.getOutputStream();
    out.write(buffer);
    out.flush();
    os.close();
}

 

三、service代碼

import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

/**
 * 導出生成execl
 * @throws Exception 
 */
public OutputStream expExecl(String id,String execlPath) throws Exception{
    List<XxDto> data = this.getSearchResult(id);
    
    Workbook wb = WorkbookFactory.create(new File(execlPath));
    
    Font font = wb.createFont();
    font.setFontName("微軟雅黑");
    font.setFontHeightInPoints((short) 10);
    
    CellStyle style = wb.createCellStyle();
    style.setBorderBottom((short)1);
    style.setBorderLeft((short)1);
    style.setBorderRight((short)1);
    style.setBorderTop((short)1);
    style.setFont(font);
    
    if(data.size()>0){
        Sheet sheet = wb.getSheetAt(0);
        int rownum = 1;
        for(XxDto item : data){
            Row row = sheet.createRow(rownum++);
            int cellnum = 0;
            row.createCell(cellnum++).setCellValue(item.getXxx());
            row.createCell(cellnum++).setCellValue(item.getXxx());
            row.createCell(cellnum++).setCellValue(item.getXxx());
            row.createCell(cellnum++).setCellValue(item.getXxx());
            row.createCell(cellnum++).setCellValue(item.getXxx());
            row.createCell(cellnum++).setCellValue(item.getXxx());
            row.createCell(cellnum++).setCellValue(item.getXxx());
            
            //設置樣式
            for(int i=0; i<cellnum; i++){
                row.getCell(i).setCellStyle(style);
            }
        }
    }
    OutputStream os = new ByteArrayOutputStream();
    wb.write(os);
    return os;
}

 

當沒有模板時須要建立文件（2007和2007之前的execl的寫法是不一樣的）

  Workbook wb;
  Sheet sheet;

File file = new File(fileName);
//文件不存在
if(!file.exists()){
    addFlag = false;
}
if(!addFlag){
    if("xls".equals(fileSuffix)){
                //老execl
        wb = new HSSFWorkbook();
    }else{
                //新execl
        wb = new XSSFWorkbook();
    }
    sheet = wb.createSheet("data");
    createExeclHead(sheet);
}else{
        //利用工廠讀取execl能夠不須要關心execl的版本問題
    wb = WorkbookFactory.create(file);
    sheet = wb.getSheetAt(0);
}

 

更詳細的用法能夠去官網看文檔:http://poi.apache.org/