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;
    }