java通过poi操作excel

HSSFWorkbook 工作簿对象

HSSFSheet 表

HSSFRow 行

row.createCell row.getCell 创建与获取

demo如下

package excelDao;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.text.DecimalFormat;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ExameRecord {
    //考试记录
    public static void main(String[] args){
        File resultFileinput = null;
        HSSFWorkbook wbinput = null;
        HSSFRow rowinput = null;
        HSSFCell cellinput = null;
        
        int a = 0; //row
        int x = 0; //考试表row
        try{
            InputStream studyRecord = new FileInputStream("D:/Users/KBLW/Desktop/测试文档/考试记录.xls"); //读取excel
            HSSFWorkbook wbdu = new HSSFWorkbook(studyRecord);
            HSSFSheet sheet1 = wbdu.getSheetAt(0);
            int rowcount = sheet1.getLastRowNum(); //行数
            
            resultFileinput = new File("D:/Users/KBLW/Desktop/测试文档/exameRecord.xls");  //创建excel
            wbinput = new HSSFWorkbook();
            HSSFSheet exameSheet = wbinput.createSheet("Sheet1");
            //HSSFSheet exameHisSheet = wbinput.createSheet("Sheet2");
            
            for(;a<rowcount;a++){
                int binput = 0;
                HSSFSheet sheet = wbdu.getSheetAt(0);
                HSSFRow row = sheet.getRow(a);
                
                HSSFCell cell0 = row.getCell(0); //学号
                HSSFCell cell1 = row.getCell(1); //科目一
                HSSFCell cell2 = row.getCell(2); //科目二
                HSSFCell cell3 = row.getCell(3); //科目三
                HSSFCell cell4 = row.getCell(4); //科目四
                
                
                //HSSFRow rowinputExameHis = exameSheet.createRow(n);//学生id,考试科目,考试第几次,考试是否通过,考试时间,是否有效,是否参加考试
                
                if(cell1.getCellType()==3){ //getCellType 获得cell值类型 0是数值 1字符串 2字符型 3空值 4布尔 5error
                    continue;
                }else{
                    HSSFRow rowinputExame = exameSheet.createRow(x);//学生id,考试科目,考试第几次,考试是否通过,考试时间,是否有效,是否参加考试
                    String amiss1 = cell1.getStringCellValue(); //获取String值
                    String miss1[] =amiss1.split("/");
                    int i = miss1.length;
                    if(i<1||i==1){
                        if(binput==0){
                            HSSFCell cellinputExame0 = rowinputExame.createCell(binput);
                            id(cell0,cellinputExame0);
                            binput++;
                        }
                        if(binput==1){
                            HSSFCell cellinputExame1 = rowinputExame.createCell(binput);
                            cellinputExame1.setCellValue("一");
                            binput++;
                        }
                        if(binput==2){
                            HSSFCell cellinputExame2 = rowinputExame.createCell(binput);
                            cellinputExame2.setCellValue(i);
                            binput++;
                        }
                       
                        if(binput==3){
                            HSSFCell cellinputExame3 = rowinputExame.createCell(binput);
                            if(miss1[i-1].charAt(0)=='合'){
                                cellinputExame3.setCellValue("过");
                            }else
                            cellinputExame3.setCellValue("不");
                            binput++;
                        }
                        if(binput==4){
                            HSSFCell cellinputExame4 = rowinputExame.createCell(binput);
                            if(miss1[i-1].charAt(0)=='合'){
                                cellinputExame4.setCellValue(miss1[i-1].substring(2));
                            }else if(miss1[i-1].charAt(0)=='不'){
                                cellinputExame4.setCellValue(miss1[i-1].substring(3));
                            }
                            binput++;
                        }
                        if(binput==5){
                            HSSFCell cellinputExame5 = rowinputExame.createCell(binput);
                            cellinputExame5.setCellValue("有效");
                            binput++;
                        }
                        if(binput==6){
                            HSSFCell cellinputExame6 = rowinputExame.createCell(binput);
                            if(miss1[i-1].charAt(0)=='弃'){
                                cellinputExame6.setCellValue("弃");
                            }else cellinputExame6.setCellValue("考");
                        }
                        x++;
                    }else{
                        int c=1;//次数
                        for(int s=i;s>1;s--){
                            HSSFRow rowinputExame1 = exameSheet.createRow(x);//学生id,考试科目,考试第几次,考试是否通过,考试时间,是否有效,是否参加考试
                            binput=0;
                            HSSFCell cellinputExame0s = rowinputExame1.createCell(binput);
                            id(cell0,cellinputExame0s);
                            HSSFCell cellinputExame1s = rowinputExame1.createCell(binput+1);
                            cellinputExame1s.setCellValue("一");
                            HSSFCell cellinputExame2s = rowinputExame1.createCell(binput+2);
                            cellinputExame2s.setCellValue(c);
                            HSSFCell cellinputExame3s = rowinputExame1.createCell(binput+3);
                            cellinputExame3s.setCellValue("不");
                            HSSFCell cellinputExame4s = rowinputExame1.createCell(binput+4);
                            cellinputExame4s.setCellValue(miss1[c-1].substring(3));
                            HSSFCell cellinputExame5s = rowinputExame1.createCell(binput+5);
                            cellinputExame5s.setCellValue("无效");
                            HSSFCell cellinputExame6s = rowinputExame1.createCell(binput+6);
                            if(miss1[c-1].charAt(0)=='弃'){
                                cellinputExame6s.setCellValue("弃");
                            }else cellinputExame6s.setCellValue("考");
                            x++;
                            c++;
                        }
                        HSSFRow rowinputExame2 = exameSheet.createRow(x);//学生id,考试科目,考试第几次,考试是否通过,考试时间,是否有效,是否参加考试
                        binput=0;
                        HSSFCell cellinputExame0s = rowinputExame2.createCell(binput);
                        id(cell0,cellinputExame0s);
                        HSSFCell cellinputExame1s = rowinputExame2.createCell(binput+1);
                        cellinputExame1s.setCellValue("一");
                        HSSFCell cellinputExame2s = rowinputExame2.createCell(binput+2);
                        cellinputExame2s.setCellValue(i);
                        HSSFCell cellinputExame3s = rowinputExame2.createCell(binput+3);
                        if(miss1[i-1].charAt(0)=='合'){
                            cellinputExame3s.setCellValue("过");
                        }else cellinputExame3s.setCellValue("不");
                        HSSFCell cellinputExame4s = rowinputExame2.createCell(binput+4);
                        if(miss1[i-1].charAt(0)=='合'){
                            cellinputExame4s.setCellValue(miss1[i-1].substring(2));
                        }else if(miss1[i-1].charAt(0)=='不'){
                            cellinputExame4s.setCellValue(miss1[i-1].substring(3));
                        }
                        HSSFCell cellinputExame5s = rowinputExame2.createCell(binput+5);
                        cellinputExame5s.setCellValue("有效");
                        HSSFCell cellinputExame6s = rowinputExame2.createCell(binput+6);
                        if(miss1[i-1].charAt(0)=='弃'){
                            cellinputExame6s.setCellValue("弃");
                        }else cellinputExame6s.setCellValue("考");
                        x++;
                    }
                }
            }
            
            FileOutputStream fosinput = new FileOutputStream(resultFileinput); //保存输入 注意 新建的excel需要保存后才能读取
            wbinput.write(fosinput);
            fosinput.flush();
            fosinput.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    
    
    //id
    public static String id(HSSFCell cell,HSSFCell cellinput){
        DecimalFormat df = new DecimalFormat("0");
        cellinput.setCellValue(df.format(cell.getNumericCellValue()));
        return null;
    }
}

在读取excel时 会遇到类型问题 需要进行单元格类型判断 然后根据不同类型进行处理 当然 也可以在getCell时就进行类型转换

cell.setCellType(HSSFCell.CELL_TYPE_STRING); //设置单元格为STRING类型

cell.setCellType(HSSFCell.CELL_TYPE_NUMER);//number类型

Region region = new Region((short)rowFrom,(short)columnFrom,(short)rowTo,(short)columnTo);//合并从第rowFrom行columnFrom列

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