java使用org.apache.poi读取与保存EXCEL文件

一、读EXCEL文件

 package com.ruijie.wis.cloud.utils;

 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.text.DecimalFormat;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;

 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.CellValue;
 import org.apache.poi.ss.usermodel.FormulaEvaluator;
 import org.apache.poi.ss.usermodel.Row;
 import org.apache.poi.xssf.usermodel.XSSFCell;
 import org.apache.poi.xssf.usermodel.XSSFCellStyle;
 import org.apache.poi.xssf.usermodel.XSSFFont;
 import org.apache.poi.xssf.usermodel.XSSFRow;
 import org.apache.poi.xssf.usermodel.XSSFSheet;
 import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

 public class ProjectImportUtil {
 public ProjectImportUtil() {
     String fileName = "D:\tst.xlsx";
 　　InputStream input = new FileInputStream(fileName); 　　　　
 }

 /* 导入销售数据 ,excel2007格式 */
 public List<Map<String,Object>> importSaleXml(InputStream input, String industry) {
 List<Map<String,Object>> result = new ArrayList<Map<String,Object>>();
 DecimalFormat df =new DecimalFormat("#0");

 try {
 XSSFWorkbook wb = new XSSFWorkbook(input); // Excel 2003 使用wb = new HSSFWorkbook(input);

 FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();

 int index_name = 0;
 int index_province = 0;
 int index_city = 0;
 int index_acs = 0;
 int index_aps = 0;
 int index_zuozhi = 0;
 String industry_name = industry;
 XSSFSheet sheet = wb.getSheet(industry_name);
 if(sheet == null) {
 logger.warn("importSaleXml - industy: " + industry_name + " not exist!");
 wb.close();
 return null;
 }
 Iterator<Row> rows = sheet.rowIterator();

 while (rows.hasNext()) {
 　　Row row = rows.next();
 　　if(row.getRowNum() == 0) { // 查找关心的数据所在列号
 　　Iterator<Cell> cells = row.cellIterator();
 　　while (cells.hasNext()) {
 　　　　Cell cell = cells.next();
 　　　　String title = getCellValue(cell,evaluator);
 　　　　if(title.equals("最终客户名称")) {
 　　　　　　index_name = cell.getColumnIndex();
 　　　　} else if(title.equals("省份")) {
 　　　　　　index_province = cell.getColumnIndex();
 　　　　} else if(title.equals("城市")) {
 　　　　　　index_city = cell.getColumnIndex();
 　　　　} else if(title.equals("AC系列")) {
 　　　　　　index_acs = cell.getColumnIndex();
 　　　　} else if(title.equals("AP系列")) {
 　　　　　　index_aps = cell.getColumnIndex();
 　　　　} else if(title.equals("卓智客户名称")) {
 　　　　　　index_zuozhi = cell.getColumnIndex();
 　　}
 　　}
 }

 　　Cell cell_name = row.getCell(index_name);
 　　Cell cell_province = row.getCell(index_province);
 　　Cell cell_city = row.getCell(index_city);
 　　Cell cell_acs = row.getCell(index_acs);
 　　Cell cell_aps = row.getCell(index_aps);
 　　String projectName = getCellValue(cell_name,evaluator);
 　　String province = getCellValue(cell_province,evaluator);
 　　String city = getCellValue(cell_city,evaluator);
 　　String acs = getCellValue(cell_acs,evaluator);
 　　String aps = getCellValue(cell_aps,evaluator);

 　　Map<String,Object> salevalue = new HashMap<String, Object>();
 　　salevalue.put("projectName", projectName);
 　　salevalue.put("industry_name", industry_name);
 　　if(province != null) {　　
 　　　　salevalue.put("province", province);
 　　}
 　　if(city != null) {
 　　　　salevalue.put("city", city);
 　　}
 　　if(acs != null) {　　
 　　　　salevalue.put("acs", acs);
 　　}
 　　if(aps != null) {
 　　　　salevalue.put("aps", aps);

 　　}

 　　result.add(salevalue);
 }
 　　wb.close();
 } catch (Exception e) {
 　　logger.error(e.toString(),e);
 }
 　　return result;
 } 

 //根据cell中的类型来返回数据
 public String getCellValue(Cell cell, FormulaEvaluator evaluator) {
 　　if(cell == null) {
 　　　　return null;
 　　}
 　　CellValue cellValue = evaluator.evaluate(cell);
 　　if(cellValue == null) {
 　　　　return null;
 　　}
 　　switch (cellValue.getCellType()) {
 　　case HSSFCell.CELL_TYPE_NUMERIC:
 　　return cell.getNumericCellValue() + "";
 　　case HSSFCell.CELL_TYPE_STRING:
 　　return cell.getStringCellValue() + "";
 　　case HSSFCell.CELL_TYPE_BOOLEAN:
 　　return cell.getBooleanCellValue() + "";
 　　case HSSFCell.CELL_TYPE_FORMULA:
 　　return cell.getCellFormula();
 　　default:
 　　return null;
 }
 }

 }

二、写EXCEL文件

 XSSFWorkbook wb=new XSSFWorkbook();
 DeviceAlarmUtil outputResult = new DeviceAlarmUtil();
 wb = outputResult.outConfigExceptionResult(wb, "配置告警信息", configAlarmList);
 response.setContentType("application/msexcel");
 response.setHeader( "Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("utf-8"), "ISO8859-1" ) ); 

 ServletOutputStream os = null;
 try {
     os = response.getOutputStream();
     //写到输出流
      wb.write(os);
 12 } catch (FileNotFoundException e) {
      e.printStackTrace();
 } catch (IOException e) {
      e.printStackTrace();
 } catch (Throwable e) {
      e.printStackTrace();
 } finally {
      if (wb != null) {
          try {
              wb.close();
          } catch (IOException e) {
              throw new Exception("IO错误，无法导出结果");
          }
      }
      if (os != null) {
          try {
          　　os.flush();
             os.close();
          } catch (IOException e) {
             throw new Exception("IO错误，无法导出结果");
          }
      }
 }

 public XSSFWorkbook outConfigExceptionResult(XSSFWorkbook wb, String sheetName, List<Map<String, Object>> sheetResult){
         XSSFSheet sheet=wb.createSheet(sheetName);
         XSSFRow row=sheet.createRow(0);
         CellStyle cellStyle =wb.createCellStyle();
         // 设置这些样式
         cellStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
         cellStyle.setFillForegroundColor(HSSFColor.LIGHT_ORANGE.index);
         cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
         cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
         cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
         cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
         cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
         XSSFFont font = wb.createFont();
         font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
         cellStyle.setFont(font);

         XSSFCell cell = row.createCell((short) 0);
         cell.setCellValue("客户名称");
         cell.setCellStyle(cellStyle);
         sheet.setColumnWidth(0, 5500);
         cell = row.createCell((short) 1);
         cell.setCellValue("AC MAC");
         cell.setCellStyle(cellStyle);
         sheet.setColumnWidth(1, 5000);
         cell = row.createCell((short) 2);
         cell.setCellValue("检查项");
         cell.setCellStyle(cellStyle);
         sheet.setColumnWidth(2, 5000);
         cell = row.createCell((short) 3);
         cell.setCellValue("检查次数");
         cell.setCellStyle(cellStyle);
         sheet.setColumnWidth(3, 5000);
         cell = row.createCell((short) 4);
         cell.setCellValue("检查时间");
         cell.setCellStyle(cellStyle);
         sheet.setColumnWidth(4, 5000);
         cell = row.createCell((short) 5);
         cell.setCellValue("记录更新时间");
         cell.setCellStyle(cellStyle);
         sheet.setColumnWidth(5, 5000);
         cell = row.createCell((short) 6);
         cell.setCellValue("当前状态");
         cell.setCellStyle(cellStyle);
         sheet.setColumnWidth(6, 4000);
         cell = row.createCell((short) 7);
         cell.setCellValue("异常等级");
         cell.setCellStyle(cellStyle);
         sheet.setColumnWidth(7, 4000);
         cell = row.createCell((short) 8);

         wb.setSheetName(0, sheetName);
         if(sheetResult.size() == 0){
             XSSFRow rows=sheet.createRow(1);
             rows.setHeight((short) 500);
             rows.createCell(0).setCellValue("没有查询结果！");
             return wb;
         }

         for(int info = 0; info < sheetResult.size(); info ++){
             XSSFRow rows=sheet.createRow(info+1);
             rows.setHeight((short) 500);
             Map<String,Object> map = sheetResult.get(info);

             rows.createCell(0).setCellValue(map.get("name") + "");
             rows.createCell(1).setCellValue(map.get("ac_mac") + "");
             rows.createCell(2).setCellValue(map.get("item_code") + "");
             rows.createCell(3).setCellValue(map.get("check_times") + "");
             rows.createCell(4).setCellValue(map.get("check_time") + "");
             rows.createCell(5).setCellValue(map.get("update_time") + "");
             rows.createCell(6).setCellValue(map.get("status") + "");
             rows.createCell(7).setCellValue(map.get("exception_level") + "");
             //多插一行，避免单元格溢出
             rows.createCell(8).setCellValue(" ");
         }

         return wb;
     }