关于POI的文件导入和导出

在很多的项目中总会需要导入EXCEL 和 导出EXCEL 这样的功能，倒是又不愿意每次都去写重复的代码，可以又难以写出一个可以适合所有的场景的工具类，折腾很多次，最后写了如下的一个工具类。
先看代码。

package com.qx.client.common.utils;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
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;

public class PoiImport{

   public PoiImport(){

   }

   public PoiImport(String title){

   }

   /** * 根据流来获取对象集合 * @param in 得到的excel流对象 * @param strs 需要填充MAP的KEY值（按照EXCEL表格列顺序填写） * @return List<Map<String, String>> * @throws IOException */
   public static List<Map<String, String>> getExcelList(InputStream in,
                                                 String[] strs)
         throws IOException{
      if(strs == null || strs.length == 0){
         return null;
      }
      List<Map<String, String>> listSheet = new ArrayList<Map<String, String>>();
      HSSFWorkbook hb = new HSSFWorkbook(in);
      //默认只取第一个sheet
      HSSFSheet sheet = hb.getSheetAt(0);
      if(sheet == null){
         return null;
      }
      // 循环行Row  
      for(int rowNum = 1; rowNum <= sheet.getLastRowNum(); rowNum++){

         HSSFRow hssfRow = sheet.getRow(rowNum);
         Map<String, String> mapRow = new HashMap<String, String>();
         if(hssfRow == null){
            //还是添加一个空进去
            listSheet.add(null);
            continue;
         }
         for(int cellNum = 0; cellNum < strs.length; cellNum++){
            HSSFCell cell = hssfRow.getCell(cellNum);
            mapRow.put(strs[cellNum], getValue(cell));
         }
         listSheet.add(mapRow);
      }

      return listSheet;
   }



   public static HSSFWorkbook initExcel(String title,
                                 String[] headers){
      // 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) 20);

   /* // 声明一个画图的顶级管理器 HSSFPatriarch patriarch = sheet.createDrawingPatriarch(); // 定义注释的大小和位置,详见文档 HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0, 0, 0, 0, (short) 4, 2, (short) 6, 5)); // 设置注释内容 comment.setString(new HSSFRichTextString("可以在POI中添加注释！")); // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容. comment.setAuthor("leno");*/

      //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(getHeadStyle(workbook));
         HSSFRichTextString text = new HSSFRichTextString(headers[i]);
         cell.setCellValue(text);
      }
      return workbook;
   }

   private static String getValue(HSSFCell hssfCell){
      if(hssfCell == null){
         return "";
      }else if(hssfCell.getCellType() == HSSFCell.CELL_TYPE_BOOLEAN){
         // 返回布尔类型的值
         return String.valueOf(hssfCell.getBooleanCellValue());
      }else if(hssfCell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC){
         // 返回数值类型的值
         return String.valueOf(hssfCell.getNumericCellValue());
      }else{
         // 返回字符串类型的值
         return String.valueOf(hssfCell.getStringCellValue());
      }
   }

   public  static HSSFCellStyle getBodyStyle(HSSFWorkbook workbook){
      // 生成并设置另一个样式
      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);
      // 生成另一个字体
      HSSFFont font2 = workbook.createFont();
      font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
      // 把字体应用到当前的样式
      style2.setFont(font2);
      return style2;
   }

   public static  HSSFCellStyle getHeadStyle(HSSFWorkbook workbook){
      HSSFCellStyle style = workbook.createCellStyle();
      // 设置这些样式
      style.setFillForegroundColor(HSSFColor.SKY_BLUE.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);

      // 生成一个字体
      HSSFFont font = workbook.createFont();
      font.setColor(HSSFColor.VIOLET.index);
      font.setFontHeightInPoints((short) 12);
      font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
      // 把字体应用到当前的样式
      style.setFont(font);
      return style;
   }
}

先看导入excel的功能

  MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
         MultipartFile mFile = mRequest.getFile("coachBatchFile");
         InputStream inputStream = mFile.getInputStream();

         String[] strs = {"userAccout","fullName","idNumber","statusCd","veduDate","gearboxCd","schoolId"};
         PoiImport pin = new PoiImport();
         List<Map<String, String>> list = pin.getExcelList(inputStream, strs);
         if (list == null || list.size() == 0) {
            printCallBack(1,0,"请检查Excel，数据为空。导入结束。");
            return;
         }

指定好一个字符串头部对应的参数。和 excel一一对应。然后就能够返回一个LIST 集合回来。然后就可以对这个list集合进行操作了。很简单。也很通用

导出EXCEL的例子

//取出要导出的数据
List<FnTotalCoachDay> list = fnTotalCoachDayService.findList(entity);

         SimpleDateFormat df = new SimpleDateFormat("yyyy-MM");
         String d = df.format(new Date());
         String title = "日统计费用";
         //定义导出的excel 的 头部
         String[] headers = { "月份", "姓名", "手机号码", "完成工单数", "科目二费用（元）", "科目三费用（元）", "陪练费用（元）", "驾校收入（元）", "教练收入（元）" };
         //设置响应头，控制浏览器下载该文件
         try{
            response.setContentType("application/octet-stream;charset=UTF-8");
            response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(d + "-day-report.xls", "UTF-8"));
            OutputStream out = response.getOutputStream();
            //初始化 excel 
            HSSFWorkbook workbook = PoiImport.initExcel(title, headers);
            //创建工作控件的 sheet
            creatDaySheet(workbook, title, list);
            //直接写入输出流里面
            workbook.write(out);

            //关闭输出流
            out.close();
            out.flush();
         }catch(Exception e){
            e.printStackTrace();
         }

      }catch(Exception e){
         _logger.error(this, "findPageDayList", e);
      }
   }

   private void creatDaySheet(HSSFWorkbook workbook,
                           String title,
                           List<FnTotalCoachDay> list){
      if(RList.isBlank(list)){
         return;
      }
      HSSFCellStyle style = PoiImport.getBodyStyle(workbook);
      HSSFSheet sheet = workbook.getSheet(title);
      for(int i = 0; i < list.size(); i++){
         FnTotalCoachDay entity = list.get(i);
         if(null == entity){
            continue;
         }
         HSSFRow row = sheet.createRow(i + 1);
         creatCell(row, style, 0, paserIntegerToString(entity.getTotalMonth()));
         creatCell(row, style, 1, entity.getCoachName());
         creatCell(row, style, 2, entity.getUserAccount());
         creatCell(row, style, 3, paserIntegerToString(entity.getSuccessNum()));
         creatCell(row, style, 4, paserDoubleToString(entity.getCourse2Cost()));
         creatCell(row, style, 5, paserDoubleToString(entity.getCourse3Cost()));
         creatCell(row, style, 6, paserDoubleToString(entity.getEscortCost()));
         creatCell(row, style, 7, paserDoubleToString(entity.getSchoolIncome()));
         creatCell(row, style, 8, paserDoubleToString(entity.getCoachIncome()));
      }
   }

   private void creatSheet(HSSFWorkbook workbook,
                           String title,
                           List<FnTotalCoachMonth> list){
      if(RList.isBlank(list)){
         return;
      }
      HSSFCellStyle style = PoiImport.getBodyStyle(workbook);
      HSSFSheet sheet = workbook.getSheet(title);
      for(int i = 0; i < list.size(); i++){
         FnTotalCoachMonth entity = list.get(i);
         if(null == entity){
            continue;
         }
         HSSFRow row = sheet.createRow(i + 1);
         creatCell(row, style, 0, paserIntegerToString(entity.getTotalMonth()));
         creatCell(row, style, 1, entity.getCoachName());
         creatCell(row, style, 2, entity.getUserAccount());
         creatCell(row, style, 3, paserIntegerToString(entity.getSuccessNum()));
         creatCell(row, style, 4, paserDoubleToString(entity.getCourse2Cost()));
         creatCell(row, style, 5, paserDoubleToString(entity.getCourse3Cost()));
         creatCell(row, style, 6, paserDoubleToString(entity.getEscortCost()));
         creatCell(row, style, 7, paserDoubleToString(entity.getSchoolIncome()));
         creatCell(row, style, 8, paserDoubleToString(entity.getCoachIncome()));
      }
   }

   private void creatCell(HSSFRow row,
                          HSSFCellStyle style,
                          int i,
                          String value){
      HSSFCell cell = row.createCell(i);
      cell.setCellStyle(style);
      cell.setCellValue(value);
   }

   private String paserIntegerToString(Integer i){
      if(null == i){
         return "0";
      }
      return i.toString();
   }

   private String paserDoubleToString(Double d){
      if(d == null){
         return "0";
      }
      return  RString.toString(d);
   }

看代码应该炒鸡 简单的。