poi 導出Excel 工具類

wn25 9年前發布 | 5K 次閱讀 Java

import java.io.OutputStream;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFClientAnchor; import org.apache.poi.hssf.usermodel.HSSFFont; import org.apache.poi.hssf.usermodel.HSSFPatriarch; import org.apache.poi.hssf.usermodel.HSSFRichTextString; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.hssf.util.HSSFColor; import org.apache.poi.hssf.util.Region; /*

  • @author Bruce Xu *
  • @param <T> */ public class ExcelUtil<T> {

    /**

    • 導出Excel的方法
    • @param title excel中的sheet名稱
    • @param headers 表頭
    • @param result 結果集
    • @param out 輸出流
    • @param pattern 時間格式
    • @throws Exception */
      public void exportExcel(String title, String[] headers,String[] columns, Collection<T> result, OutputStream out, String pattern) throws Exception{
      // 聲明一個工作薄
      HSSFWorkbook workbook = new HSSFWorkbook();
      // 生成一個表格
      HSSFSheet sheet = workbook.createSheet(title);
      // 設置表格默認列寬度為20個字節
      sheet.setDefaultColumnWidth((short)20);
    // 生成一個樣式   
    HSSFCellStyle style = workbook.createCellStyle();   
    // 設置這些樣式   
    style.setFillForegroundColor(HSSFColor.GOLD.index);   
    style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);   
    style.setBorderBottom(HSSFCellStyle.BORDER_THIN);   
    style.setBorderLeft(HSSFCellStyle.BORDER_THIN);   
    style.setBorderRight(HSSFCellStyle.BORDER_THIN);   
    style.setBorderTop(HSSFCellStyle.BORDER_THIN);   
    style.setAlignment(HSSFCellStyle.ALIGN_CENTER);   
    // 生成一個字體   
    HSSFFont font = workbook.createFont();   
    font.setColor(HSSFColor.VIOLET.index);   
    //font.setFontHeightInPoints((short) 12);   
    font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);   
    // 把字體應用到當前的樣式   
    style.setFont(font);   

    // 指定當單元格內容顯示不下時自動換行   
    style.setWrapText(true);   

    // 聲明一個畫圖的頂級管理器  
    HSSFPatriarch patriarch = sheet.createDrawingPatriarch(); 
    /* 

     以下可以用于設置導出的數據的樣式 

    // 生成并設置另一個樣式 
    HSSFCellStyle style2 = workbook.createCellStyle(); 
    style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index); 
    style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND); 
    style2.setBorderBottom(HSSFCellStyle.BORDER_THIN); 
    style2.setBorderLeft(HSSFCellStyle.BORDER_THIN); 
    style2.setBorderRight(HSSFCellStyle.BORDER_THIN); 
    style2.setBorderTop(HSSFCellStyle.BORDER_THIN); 
    style2.setAlignment(HSSFCellStyle.ALIGN_CENTER); 
    style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); 
    // 生成另一個字體 
    HSSFFont font2 = workbook.createFont(); 
    font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL); 
    // 把字體應用到當前的樣式 
    style2.setFont(font2); 
    // 聲明一個畫圖的頂級管理器 
    HSSFPatriarch patriarch = sheet.createDrawingPatriarch(); 


    // 定義注釋的大小和位置,詳見文檔 
    HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0, 0, 0, 0, (short) 4, 2, (short) 6, 5)); 
    // 設置注釋內容 
    comment.setString(new HSSFRichTextString("可以在POI中添加注釋!")); 
    // 設置注釋作者,當鼠標移動到單元格上是可以在狀態欄中看到該內容. 
    comment.setAuthor("leno");*/   


    // 產生表格標題行   
    //表頭的樣式 
    HSSFCellStyle titleStyle = workbook.createCellStyle();// 創建樣式對象 
    titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);// 水平居中 
    titleStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直居中 
    // 設置字體 
    HSSFFont titleFont = workbook.createFont(); // 創建字體對象 
    titleFont.setFontHeightInPoints((short) 15); // 設置字體大小 
    titleFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 設置粗體 
  //  titleFont.setFontName("黑體"); // 設置為黑體字 
    titleStyle.setFont(titleFont); 
    sheet.addMergedRegion(new Region(0,(short)0,0,(short)(headers.length-1)));//指定合并區域  
    HSSFRow rowHeader = sheet.createRow(0);   
    HSSFCell cellHeader = rowHeader.createCell((short)0);   //只能往第一格子寫數據,然后應用樣式,就可以水平垂直居中 
    HSSFRichTextString textHeader = new HSSFRichTextString(title);   
    cellHeader.setCellStyle(titleStyle); 
    cellHeader.setCellValue(textHeader); 

    HSSFRow row = sheet.createRow(1);   
    for (int i = 0; i < headers.length; i++) {   
        HSSFCell cell = row.createCell((short)i);   
        cell.setCellStyle(style);   
        HSSFRichTextString text = new HSSFRichTextString(headers[i]);   
        cell.setCellValue(text);   
     }   
     // 遍歷集合數據,產生數據行   
     if(result != null){   
         int index = 2;   
         for(T t:result){  
         //  Field[] fields = t.getClass().getDeclaredFields(); 
             row = sheet.createRow(index);   
             index++; 
             for(short i = 0; i < columns.length; i++) { 
                 HSSFCell cell = row.createCell(i); 

// Field field = fields[i]; // String fieldName = field.getName(); String fieldName = columns[i]; String getMethodName = "get"

                     + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1); 
                 Class tCls = t.getClass(); 
                 Method getMethod = tCls.getMethod(getMethodName, new Class[]{}); 
                // getMethod.getReturnType().isInstance(obj);
                 Object value = getMethod.invoke(t, new Class[]{}); 
                 String textValue = null; 
                 if(value == null) { 
                     textValue = ""; 
                 }else if (value instanceof Date) { 
                     Date date = (Date) value; 
                     SimpleDateFormat sdf = new SimpleDateFormat(pattern); 
                      textValue = sdf.format(date); 
                  }  else if (value instanceof byte[]) { 
                     // 有圖片時,設置行高為60px; 
                     row.setHeightInPoints(60); 
                     // 設置圖片所在列寬度為80px,注意這里單位的一個換算 
                     sheet.setColumnWidth(i, (short) (35.7 * 80)); 
                     // sheet.autoSizeColumn(i); 
                     byte[] bsValue = (byte[]) value; 
                     HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 
                           1023, 255, (short) 6, index, (short) 6, index); 
                     anchor.setAnchorType(2); 
                     patriarch.createPicture(anchor, workbook.addPicture( 
                           bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG)); 
                  } else{ 
                     //其它數據類型都當作字符串簡單處理 
                     textValue = value.toString(); 
                  } 

                 if(textValue!= null){ 
                     Pattern p = Pattern.compile("^//d+(//.//d+)?$");   
                     Matcher matcher = p.matcher(textValue); 
                     if(matcher.matches()){ 
                        //是數字當作double處理 
                        cell.setCellValue(Double.parseDouble(textValue)); 
                     }else{ 
                        HSSFRichTextString richString = new HSSFRichTextString(textValue); 

// HSSFFont font3 = workbook.createFont(); // font3.setColor(HSSFColor.BLUE.index); // richString.applyFont(font3); cell.setCellValue(richString); } } } }
}
workbook.write(out);
}
}

</pre>

 

調用示例:以springmvc為例,導出數據庫記錄到Excel,彈出下載對話框

@RequestMapping(value="/exprotExcel")
 public @ResponseBody String exprotExcel(HttpServletResponse response,NjWorkLog njWorkLog,@RequestParam(value="createUserIds",required=false) String createUserIds,@RequestParam(value="workLogGrantUsersName",required=false)String workLogGrantUsersName,@RequestParam(value="strWorkEndDate",required=false)String strWorkEndDate)
 {

ExcelUtil<NjWorkLog> excelUtil=new ExcelUtil<NjWorkLog>(); OutputStream out=null; try { out = response.getOutputStream();// 取得輸出流
//out.flush(); response.reset();// 清空輸出流

         response.setHeader("Content-disposition", "attachment; filename="+new String("工作日志".getBytes("GB2312"),"8859_1")+".xls");// 設定輸出文件頭  
         response.setContentType("application/msexcel");// 定義輸出類型

} catch (IOException e) { e.printStackTrace(); } String[] headers ={"跟蹤目標","工作時間","事項類型","項目名稱","完成情況自述","工作量","進度","配合人員","加班","作者","附件名稱"}; String[]columns={ "strTarget", "strWorkDate", "dictTypeId", "projectId", "strDesc", "bdWorkload", "strSchedule", "strCooperate","isOverTime","createUserId", "strFileName"}; if("on".equals(njWorkLog.getIsOverTime())) njWorkLog.setIsOverTime("1"); else njWorkLog.setIsOverTime(""); if(StringUtils.isNotBlank(createUserIds)) njWorkLog.setTempArray(createUserIds.split(",")); List<NjWorkLog> dataset=njWorkLogService.findMyAttentionExcel(njWorkLog);

try { excelUtil.exportExcel("工作日志", headers, columns, dataset, out, "");

} catch (Exception e1) { e1.printStackTrace(); } try { out.close(); } catch (IOException e) { e.printStackTrace(); } return null; }</pre>

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