Question

下面是我的代码，我试图使用Apache POI读取excel数据，并希望通过将First列值作为键，将最后一列作为值来存储Hashmap中的第一列和最后一列值。将值放在hashmap中时，我遇到了一个问题。我的预期输出应该是

Key         value
UserDefined Xpath_original  
seldriver   xpath;//div[@id='mBody']    
Selenium    xpath;//table[@id='choice']/tbody/tr/td[1]/ul/li[1]

但我得到的输出为

*

null null
null
null xpath;//div[@id='mBody']

* 下面是我的一段代码

package com.selenium.common;
import java.io.File;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

public class ReadMacroExcel {
public static void main(String[] args) {
 try {

         File f=new File("C:\\Users\\Rajaram.8.Kannuri\\Downloads\\Fire-IEBrowser1.4.xlsm");
         HashMap <String,String> innerMap =null;
         Workbook workbook = WorkbookFactory.create(f);
         System.out.println(workbook);
         int numberOfSheets = workbook.getNumberOfSheets();
         org.apache.poi.ss.usermodel.Sheet sheet=null; 
         String key = "";
         String value = "";
         //Get the  sheet in the xlsx file
         for (int i = 0; i < numberOfSheets; i++) {                         
             sheet = workbook.getSheetAt(i);
             System.out.println(sheet.getSheetName());
             int firstColumn = sheet.getRow(0).getFirstCellNum();
             int lastColumn = sheet.getRow(0).getLastCellNum(); 
             Iterator<Row> rowIterator = sheet.iterator();
             innerMap = new HashMap<String,String>();
             while(rowIterator.hasNext())
             {
                     Row row = rowIterator.next();

                     Iterator<Cell> cellIterator = row.cellIterator();

                     while (cellIterator.hasNext())
                     {

                         Cell cell = cellIterator.next();

                         if(cell.getColumnIndex()==firstColumn||cell.getColumnIndex()==lastColumn-1)
                         {

                             switch (cell.getCellType())
                             {
                                 case Cell.CELL_TYPE_STRING: 
                                         key = cell.getStringCellValue();
                                         /*System.out.print(key + "\t");*/
                                        /* Thread.sleep(5000);*/
                                 break;
                                 case Cell.CELL_TYPE_FORMULA:
                                        value = cell.getRichStringCellValue().toString();
                                        /*System.out.print(value + "\t");*/
                                        /*Thread.sleep(5000);*/
                                 break; 
                              }
                            System.out.print(innerMap.put(key,value));
                         }

                     }

                     System.out.println("");

                 }
           /*  System.out.println(innerMap.get("UserDefined"));*/
             }

     }
     catch (Exception e)
     {
         e.printStackTrace();
     }


    }
}

任何人都可以帮我解决这个问题吗？

Answer 1

您似乎正在尝试使用

打印插入的值

System.out.print(innerMap.put(key,value));

但是，put会返回与给定密钥关联的上一个值，如果没有该密钥的映射，则返回null。

另见https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html#put-K-V-

您应该使用类似

的内容

innerMap.put(key,value);               // add the new mapping to the hashmap
System.out.print(innerMap);            // dumps the complete map with all entries
System.out.print(innerMap.get(key));   // dumps the value for the recently inserted key

HasMap插入空值而不是字符串？

1 个答案: