1 package main.java.commUtils;
  2 
  3 import org.apache.poi.ss.usermodel.*;
  4 
  5 import java.io.File;
  6 import java.io.FileInputStream;
  7 import java.io.IOException;
  8 import java.util.ArrayList;
  9 import java.util.HashMap;
 10 import java.util.List;
 11 import java.util.Map;
 12 
 13 
 14 public class ExcelReader {
 15     private String filePath;
 16     private String sheetName;
 17     private Workbook workBook;
 18     private Sheet sheet;
 19     private List<String> columnHeaderList;
 20     private List<List<String>> listData;
 21     private List<Map<String, String>> mapData;
 22     private boolean flag;
 23 
 24     public ExcelReader(String filePath, String sheetName) {
 25         this.filePath = filePath;
 26         this.sheetName = sheetName;
 27         this.flag = false;
 28         this.load();
 29     }
 30 
 31     private void load() {
 32         FileInputStream inStream = null;
 33         try {
 34             inStream = new FileInputStream(new File(filePath));
 35             workBook = WorkbookFactory.create(inStream);
 36             sheet = workBook.getSheet(sheetName);
 37         } catch (Exception e) {
 38             e.printStackTrace();
 39         } finally {
 40             try {
 41                 if (inStream != null) {
 42                     inStream.close();
 43                 }
 44             } catch (IOException e) {
 45                 e.printStackTrace();
 46             }
 47         }
 48     }
 49 
 50     private String getCellValue(Cell cell) {
 51         String cellValuehttp://www.mamicode.com/= "";
 52         DataFormatter formatter = new DataFormatter();
 53         if (cell != null) {
 54             switch (cell.getCellType()) {
 55                 case Cell.CELL_TYPE_NUMERIC:
 56                     if (DateUtil.isCellDateFormatted(cell)) {
 57                         cellValue =http://www.mamicode.com/ formatter.formatCellValue(cell);
 58                     } else {
 59                         double value =http://www.mamicode.com/ cell.getNumericCellValue();
 60                         int intValue = http://www.mamicode.com/(int) value;
 61                         cellValue = http://www.mamicode.com/value - intValue == 0 ? String.valueOf(intValue) : String.valueOf(value);
 62                     }
 63                     break;
 64                 case Cell.CELL_TYPE_STRING:
 65                     cellValue =http://www.mamicode.com/ cell.getStringCellValue();
 66                     break;
 67                 case Cell.CELL_TYPE_BOOLEAN:
 68                     cellValue =http://www.mamicode.com/ String.valueOf(cell.getBooleanCellValue());
 69                     break;
 70                 case Cell.CELL_TYPE_FORMULA:
 71                     cellValue =http://www.mamicode.com/ String.valueOf(cell.getCellFormula());
 72                     break;
 73                 case Cell.CELL_TYPE_BLANK:
 74                     cellValuehttp://www.mamicode.com/= "";
 75                     break;
 76                 case Cell.CELL_TYPE_ERROR:
 77                     cellValuehttp://www.mamicode.com/= "";
 78                     break;
 79                 default:
 80                     cellValue =http://www.mamicode.com/ cell.toString().trim();
 81                     break;
 82             }
 83         }
 84         return cellValue.trim();
 85     }
 86 
 87     private void getSheetData() {
 88         listData = http://www.mamicode.com/new ArrayList<List<String>>();
 89         mapData = http://www.mamicode.com/new ArrayList<Map<String, String>>();
 90         columnHeaderList = new ArrayList<String>();
 91         int numOfRows = sheet.getLastRowNum() + 1;
 92         for (int i = 0; i < numOfRows; i++) {
 93             Row row = sheet.getRow(i);
 94             Map<String, String> map = new HashMap<String, String>();
 95             List<String> list = new ArrayList<String>();
 96             if (row != null) {
 97                 for (int j = 0; j < row.getLastCellNum(); j++) {
 98                     Cell cell = row.getCell(j);
 99                     if (i == 0) {
100                         columnHeaderList.add(getCellValue(cell));
101                     } else {
102                         map.put(columnHeaderList.get(j), this.getCellValue(cell));
103                     }
104                     list.add(this.getCellValue(cell));
105                 }
106             }
107             if (i > 0) {
108                 mapData.add(map);
109             }
110             listData.add(list);
111 
112         }
113         flag = true;
114     }
115 
116     public String getCellData(int row, int col) {
117         if (row <= 0 || col <= 0) {
118             return null;
119         }
120         if (!flag) {
121             this.getSheetData();
122         }
123         if (listData.size() >= row && listData.get(row - 1).size() >= col) {
124             return listData.get(row - 1).get(col - 1);
125         } else {
126             return null;
127         }
128     }
129 
130     public String getCellData(int row, String headerName) {
131         if (row <= 0) {
132             return null;
133         }
134         if (!flag) {
135             this.getSheetData();
136         }
137         if (mapData.size() >= row && mapData.get(row - 1).containsKey(headerName)) {
138             return mapData.get(row - 1).get(headerName);
139         } else {
140             return null;
141         }
142     }
143 
144 
145     public static void main(String[] args) {
146         ExcelReader eh = new ExcelReader("C:\\Users\\ty\\Documents\\工作簿1.xlsx", "Sheet2");
147         System.out.println(eh.getCellData(1, 1));
148         // System.out.println(eh.getCellData(1, "test1"));
149         System.out.println(eh.getCellData(1, 1));
150         eh.getSheetData();
151 
152     }
153 }