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

  1 package excelDao;
  2 
  3 import java.io.File;
  4 import java.io.FileInputStream;
  5 import java.io.FileOutputStream;
  6 import java.io.InputStream;
  7 import java.text.DecimalFormat;
  8 
  9 import org.apache.poi.hssf.usermodel.HSSFCell;
 10 import org.apache.poi.hssf.usermodel.HSSFRow;
 11 import org.apache.poi.hssf.usermodel.HSSFSheet;
 12 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 13 
 14 public class ExameRecord {
 15     //考试记录
 16     public static void main(String[] args){
 17         File resultFileinput = null;
 18         HSSFWorkbook wbinput = null;
 19         HSSFRow rowinput = null;
 20         HSSFCell cellinput = null;
 21         
 22         int a = 0; //row
 23         int x = 0; //考试表row
 24         try{
 25             InputStream studyRecord = new FileInputStream("D:/Users/KBLW/Desktop/测试文档/考试记录.xls"); //读取excel
 26             HSSFWorkbook wbdu = new HSSFWorkbook(studyRecord);
 27             HSSFSheet sheet1 = wbdu.getSheetAt(0);
 28             int rowcount = sheet1.getLastRowNum(); //行数
 29             
 30             resultFileinput = new File("D:/Users/KBLW/Desktop/测试文档/exameRecord.xls");  //创建excel
 31             wbinput = new HSSFWorkbook();
 32             HSSFSheet exameSheet = wbinput.createSheet("Sheet1");
 33             //HSSFSheet exameHisSheet = wbinput.createSheet("Sheet2");
 34             
 35             for(;a<rowcount;a++){
 36                 int binput = 0;
 37                 HSSFSheet sheet = wbdu.getSheetAt(0);
 38                 HSSFRow row = sheet.getRow(a);
 39                 
 40                 HSSFCell cell0 = row.getCell(0); //学号
 41                 HSSFCell cell1 = row.getCell(1); //科目一
 42                 HSSFCell cell2 = row.getCell(2); //科目二
 43                 HSSFCell cell3 = row.getCell(3); //科目三
 44                 HSSFCell cell4 = row.getCell(4); //科目四
 45                 
 46                 
 47                 //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
 48                 
 49                 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
 50                     continue;
 51                 }else{
 52                     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
 53                     String amiss1 = cell1.getStringCellValue(); //获取String值
 54                     String miss1[] =amiss1.split("/");
 55                     int i = miss1.length;
 56                     if(i<1||i==1){
 57                         if(binput==0){
 58                             HSSFCell cellinputExame0 = rowinputExame.createCell(binput);
 59                             id(cell0,cellinputExame0);
 60                             binput++;
 61                         }
 62                         if(binput==1){
 63                             HSSFCell cellinputExame1 = rowinputExame.createCell(binput);
 64                             cellinputExame1.setCellValue("一");
 65                             binput++;
 66                         }
 67                         if(binput==2){
 68                             HSSFCell cellinputExame2 = rowinputExame.createCell(binput);
 69                             cellinputExame2.setCellValue(i);
 70                             binput++;
 71                         }
 72                        
 73                         if(binput==3){
 74                             HSSFCell cellinputExame3 = rowinputExame.createCell(binput);
 75                             if(miss1[i-1].charAt(0)=='合'){
 76                                 cellinputExame3.setCellValue("过");
 77                             }else
 78                             cellinputExame3.setCellValue("不");
 79                             binput++;
 80                         }
 81                         if(binput==4){
 82                             HSSFCell cellinputExame4 = rowinputExame.createCell(binput);
 83                             if(miss1[i-1].charAt(0)=='合'){
 84                                 cellinputExame4.setCellValue(miss1[i-1].substring(2));
 85                             }else if(miss1[i-1].charAt(0)=='不'){
 86                                 cellinputExame4.setCellValue(miss1[i-1].substring(3));
 87                             }
 88                             binput++;
 89                         }
 90                         if(binput==5){
 91                             HSSFCell cellinputExame5 = rowinputExame.createCell(binput);
 92                             cellinputExame5.setCellValue("有效");
 93                             binput++;
 94                         }
 95                         if(binput==6){
 96                             HSSFCell cellinputExame6 = rowinputExame.createCell(binput);
 97                             if(miss1[i-1].charAt(0)=='弃'){
 98                                 cellinputExame6.setCellValue("弃");
 99                             }else cellinputExame6.setCellValue("考");
100                         }
101                         x++;
102                     }else{
103                         int c=1;//次数
104                         for(int s=i;s>1;s--){
105                             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
106                             binput=0;
107                             HSSFCell cellinputExame0s = rowinputExame1.createCell(binput);
108                             id(cell0,cellinputExame0s);
109                             HSSFCell cellinputExame1s = rowinputExame1.createCell(binput+1);
110                             cellinputExame1s.setCellValue("一");
111                             HSSFCell cellinputExame2s = rowinputExame1.createCell(binput+2);
112                             cellinputExame2s.setCellValue(c);
113                             HSSFCell cellinputExame3s = rowinputExame1.createCell(binput+3);
114                             cellinputExame3s.setCellValue("不");
115                             HSSFCell cellinputExame4s = rowinputExame1.createCell(binput+4);
116                             cellinputExame4s.setCellValue(miss1[c-1].substring(3));
117                             HSSFCell cellinputExame5s = rowinputExame1.createCell(binput+5);
118                             cellinputExame5s.setCellValue("无效");
119                             HSSFCell cellinputExame6s = rowinputExame1.createCell(binput+6);
120                             if(miss1[c-1].charAt(0)=='弃'){
121                                 cellinputExame6s.setCellValue("弃");
122                             }else cellinputExame6s.setCellValue("考");
123                             x++;
124                             c++;
125                         }
126                         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
127                         binput=0;
128                         HSSFCell cellinputExame0s = rowinputExame2.createCell(binput);
129                         id(cell0,cellinputExame0s);
130                         HSSFCell cellinputExame1s = rowinputExame2.createCell(binput+1);
131                         cellinputExame1s.setCellValue("一");
132                         HSSFCell cellinputExame2s = rowinputExame2.createCell(binput+2);
133                         cellinputExame2s.setCellValue(i);
134                         HSSFCell cellinputExame3s = rowinputExame2.createCell(binput+3);
135                         if(miss1[i-1].charAt(0)=='合'){
136                             cellinputExame3s.setCellValue("过");
137                         }else cellinputExame3s.setCellValue("不");
138                         HSSFCell cellinputExame4s = rowinputExame2.createCell(binput+4);
139                         if(miss1[i-1].charAt(0)=='合'){
140                             cellinputExame4s.setCellValue(miss1[i-1].substring(2));
141                         }else if(miss1[i-1].charAt(0)=='不'){
142                             cellinputExame4s.setCellValue(miss1[i-1].substring(3));
143                         }
144                         HSSFCell cellinputExame5s = rowinputExame2.createCell(binput+5);
145                         cellinputExame5s.setCellValue("有效");
146                         HSSFCell cellinputExame6s = rowinputExame2.createCell(binput+6);
147                         if(miss1[i-1].charAt(0)=='弃'){
148                             cellinputExame6s.setCellValue("弃");
149                         }else cellinputExame6s.setCellValue("考");
150                         x++;
151                     }
152                 }
153             }
154             
155             FileOutputStream fosinput = new FileOutputStream(resultFileinput); //保存输入 注意 新建的excel需要保存后才能读取
156             wbinput.write(fosinput);
157             fosinput.flush();
158             fosinput.close();
159         }catch(Exception e){
160             e.printStackTrace();
161         }
162     }
163     
164     
165     //id
166     public static String id(HSSFCell cell,HSSFCell cellinput){
167         DecimalFormat df = new DecimalFormat("0");
168         cellinput.setCellValue(df.format(cell.getNumericCellValue()));
169         return null;
170     }
171 }

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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原文地址：https://www.cnblogs.com/bycainiao/p/5821264.html