POI Excel文件的读取与写入

1. 创建目录

if(!(new File(path).isDirectory())){
    new File(path).mkdirs();
}

2. 读取Excel文件，并进行写入操作

Workbook workbook = new HSSFWorkbook(new FileInputStream(path+filename));
Sheet sourceSheet = workbook.getSheetAt(0);
int rowEnd = sourceSheet.getLastRowNum();
for (int i = 0; i <= rowEnd; i++) {//按 行 读取
    Row row = sourceSheet.getRow(i);
　　//读取
　　String str=row.getCell(n).getStringCellValue();//n表示第几列
　　//写入
　　row.createCell(m, Cell.CELL_TYPE_STRING).setCellValue(nbFile.getProductId().toString());//m表示第几列

}

FileOutputStream out=new FileOutputStream(WebConstants.FILE.UPLOAD_PATH + nbFile.getUserId() + "/" + nbFile.getFilename());
out.flush();
workbook.write(out);
out.close();

3. 写入Excel文件

HSSFWorkbook resultWorkbook=new HSSFWorkbook();
HSSFSheet resultSheet =resultWorkbook.createSheet("sheet1");

for(int i=0;i<100;i++){
　　Row row=resultSheet.createRow(i);
　　row.createCell(n, Cell.CELL_TYPE_STRING).setCellValue(trans.getName());//n表示第几列

}

FileOutputStream out=new FileOutputStream(path+filename+".xls");  //向d://test.xls中写数据
out.flush();
resultWorkbook.write(out);
out.close();

4. maven项目引入POI包

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.10-FINAL</version>
</dependency>

5. 例子

package cn.*.*.quartz;

import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.List;

@Component
public class BatchQuery {
    private final static Log logger = LogFactory.getLog(BatchQuery.class);

    @Autowired
    private HandleFileService handleFileService;
    @Autowired
    private CheckService checkService;
　　private String path="D://excel/"
    @Scheduled(cron="${batch.query.frequency}")
    public void query() {
        try {
            List<NbFile> fileList = handleFileService.getNbFile();
            logger.info("batchQuery number="+fileList.size());
            if (fileList != null && fileList.size() > 0) {
                for (file1 File: fileList) {
                   if(!(new File(path).isDirectory())){
                        new File(path).mkdirs();
                    }
                    //结果文件
                    HSSFWorkbook resultWorkbook=new HSSFWorkbook();
                    HSSFSheet resultSheet =resultWorkbook.createSheet("sheet1");
                    //客户请求文件
                    Workbook workbook = new HSSFWorkbook(new FileInputStream(path+ file1.getFilename()));
                    Sheet sourceSheet = workbook.getSheetAt(0);
                    int rowEnd = sourceSheet.getLastRowNum();
　　　　　　　　　　　　//边读取Excel文件，边写入结果，写入已读记录
                    for (int i = 0; i <= rowEnd; i++) {//按 行 读取
                        Row row = sourceSheet.getRow(i);
                        Trans trans=queryByProduct(row,file1.getProductId(),file1.getUserId());
                        if (null!=trans){//有结果
                            //把查询结果添加入新的Excel文件
                            addResultToExcel(resultWorkbook,resultSheet,trans, i,file1);
                            //标志该条记录已查
                            addQueryFlag(workbook,row, file1);
                        }
                    }
                    handleFileService.delete(nbFile);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //每查询一条记录，在该记录后面添加已查询的标志
    private void addQueryFlag(Workbook workbook,Row row,NbFile nbFile)throws Exception{
        row.createCell(WebConstants.PP_CELLINDEX.STATE, Cell.CELL_TYPE_STRING).setCellValue(nbFile.getProductId().toString());
        FileOutputStream out=new FileOutputStream(WebConstants.FILE.UPLOAD_PATH + nbFile.getUserId() + "/" + nbFile.getFilename());
        out.flush();
        workbook.write(out);
        out.close();
    }

    //把查询信息 写入 Excel文件中
    private void addResultToExcel(Workbook resultWorkbook,HSSFSheet resultSheet,Trans trans,int i,NbFile nbFile)throws Exception {
        Row row=resultSheet.createRow(i);
        row.createCell(WebConstants.PP_CELLINDEX.NAME, Cell.CELL_TYPE_STRING).setCellValue(trans.getName());
        row.createCell(WebConstants.PP_CELLINDEX.IDCARD, Cell.CELL_TYPE_STRING).setCellValue(trans.getIdcard());
        row.createCell(WebConstants.PP_CELLINDEX.PHONE, Cell.CELL_TYPE_STRING).setCellValue(trans.getPhone());
        row.createCell(WebConstants.PP_CELLINDEX.BANKCARD, Cell.CELL_TYPE_STRING).setCellValue(trans.getBankcard());
        row.createCell(WebConstants.PP_CELLINDEX.CPHM, Cell.CELL_TYPE_STRING).setCellValue(trans.getCphm());
        row.createCell(WebConstants.PP_CELLINDEX.CLLX, Cell.CELL_TYPE_STRING).setCellValue(trans.getCllx());
        row.createCell(WebConstants.PP_CELLINDEX.DABH, Cell.CELL_TYPE_STRING).setCellValue(trans.getDabh());
        row.createCell(WebConstants.PP_CELLINDEX.JSZH, Cell.CELL_TYPE_STRING).setCellValue(trans.getJszh());
        JSONObject json=JSONObject.parseObject(trans.getResultJSON());
        row.createCell(WebConstants.PP_CELLINDEX.RESULTCODE, Cell.CELL_TYPE_STRING).setCellValue(json.getString("resultCode"));
        row.createCell(WebConstants.PP_CELLINDEX.RESULTMESSAGE, Cell.CELL_TYPE_STRING).setCellValue(json.getString("resultMessage"));
        FileOutputStream out=new FileOutputStream(WebConstants.FILE.RESULT_PATH+nbFile.getUserId()+"_"+WebConstants.ProductEnum.nameFromId(nbFile.getProductId())+".xls");  //向d://test.xls中写数据
        out.flush();
        resultWorkbook.write(out);
        out.close();
    }

    //查询结果
    private Trans queryByProduct(Row row,Integer productId,Integer userId)throws Exception{
        if (null==row.getCell(WebConstants.PP_CELLINDEX.STATE)||!productId.toString().equals(row.getCell(WebConstants.PP_CELLINDEX.STATE).getStringCellValue())){
            Trans trans=new Trans();
            trans.setProductId(productId);
            trans.setUserId(userId);
            trans.setName(row.getCell(WebConstants.PP_CELLINDEX.NAME) == null ? null : row.getCell(WebConstants.PP_CELLINDEX.NAME).getStringCellValue());
            trans.setIdcard(row.getCell(WebConstants.PP_CELLINDEX.IDCARD) == null ? null:row.getCell(WebConstants.PP_CELLINDEX.IDCARD).getStringCellValue());
            trans.setPhone(row.getCell(WebConstants.PP_CELLINDEX.PHONE) == null ? null : row.getCell(WebConstants.PP_CELLINDEX.PHONE).getStringCellValue());
            trans.setBankcard(row.getCell(WebConstants.PP_CELLINDEX.BANKCARD) == null ? null : row.getCell(WebConstants.PP_CELLINDEX.BANKCARD).getStringCellValue());
            trans.setCphm(row.getCell(WebConstants.PP_CELLINDEX.CPHM) == null ? null : row.getCell(WebConstants.PP_CELLINDEX.CPHM).getStringCellValue());
            trans.setCllx(row.getCell(WebConstants.PP_CELLINDEX.CLLX) == null ? null : row.getCell(WebConstants.PP_CELLINDEX.CLLX).getStringCellValue());
            trans.setJszh(row.getCell(WebConstants.PP_CELLINDEX.JSZH) == null ? null : row.getCell(WebConstants.PP_CELLINDEX.JSZH).getStringCellValue());
            trans.setDabh(row.getCell(WebConstants.PP_CELLINDEX.DABH) == null ? null : row.getCell(WebConstants.PP_CELLINDEX.DABH).getStringCellValue());
            String result=checkService.check(trans);
            if (!StringUtil.isEmpty(result)){
                trans.setResultJSON(result);
            }else {
                return null;
            }
            return trans;
        }
       return null;
    }
}