Java将Excel中的数据导入一般文件

Java将Excel中的数据导入一般文件

运行此程序需要添加一个jar包 下载地址

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;



import java.util.StringTokenizer;
 






import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

 

public  class ExcelToFile {
     public  static  void main(String[] args)  throws Exception {
        solve("D:\\input.xls", "D:\\output.txt");
        System.out.println("finished!");
    }
    
     private  static String readFile(String filename)  throws Exception {
        BufferedReader reader =  new BufferedReader( new FileReader(filename));
        String ans = "", line =  null;
         while ((line = reader.readLine()) !=  null) {
            ans += line + "\r\n";
        }
        reader.close();
         return ans;
    }
    
     private  static  void writeFile(String content, String filename)
             throws Exception {
        BufferedWriter writer =  new BufferedWriter( new FileWriter(filename));
        writer.write(content);
        writer.flush();
        writer.close();
    }

     private  static  void solve(String xls_name, String outfile)  throws Exception {

        String ans = "";
        File file =  new File(xls_name);
        String[][] result = getData(file, 2);
         int rowLength = result.length;

         for( int i=0;i<rowLength;i++) {   
            for( int j=0;j<result[i].length;j++) {
              ans += result[i][j]+" ";
           }
           ans += "\r\n";
        }
        writeFile(ans, outfile);
    }

     /**
     * 读取Excel的内容，第一维数组存储的是一行中格列的值，二维数组存储的是多少个行
     *  @param  file 读取数据的源Excel
     *  @param  ignoreRows 读取数据忽略的行数，比喻行头不需要读入 忽略的行数为1
     *  @return  读出的Excel中数据的内容
     *  @throws  FileNotFoundException
     *  @throws  IOException
      */

     public  static String[][] getData(File file,  int ignoreRows)
            throws FileNotFoundException, IOException {
       List<String[]> result =  new ArrayList<String[]>();
        int rowSize = 0;
       BufferedInputStream in =  new BufferedInputStream( new FileInputStream(
              file));
        //  打开HSSFWorkbook
       POIFSFileSystem fs =  new POIFSFileSystem(in);
       HSSFWorkbook wb =  new HSSFWorkbook(fs);
       HSSFCell cell =  null;
        for ( int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {
           HSSFSheet st = wb.getSheetAt(sheetIndex);
            //  第一行为标题，不取
            for ( int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {
              HSSFRow row = st.getRow(rowIndex);
               if (row ==  null) {
                   continue;
              }
               int tempRowSize = row.getLastCellNum() + 1;
               if (tempRowSize > rowSize) {
                  rowSize = tempRowSize;
              }
              String[] values =  new String[rowSize];
              Arrays.fill(values, "");
               boolean hasValue =  false;
               for ( short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {
                  String value = "";
                  cell = row.getCell(columnIndex);
                   if (cell !=  null) {
                      //  注意：一定要设成这个，否则可能会出现乱码
                     cell.setEncoding(HSSFCell.ENCODING_UTF_16);
                      switch (cell.getCellType()) {
                      case HSSFCell.CELL_TYPE_STRING:
                         value = cell.getStringCellValue();
                          break;
                      case HSSFCell.CELL_TYPE_NUMERIC:
                         value = String.format("%.2f", cell.getNumericCellValue());
                          if (HSSFDateUtil.isCellDateFormatted(cell)) {
                             Date date = cell.getDateCellValue();
                              if (date !=  null) {
                                 value =  new SimpleDateFormat("yyyy-MM-dd")
                                       .format(date);
                            }  else {
                                value = "";
                            }
                         }  else {
                            value =  new DecimalFormat("0").format(cell
                                   .getNumericCellValue());
                         }
                          break;
                      case HSSFCell.CELL_TYPE_FORMULA:
                          //  导入时如果为公式生成的数据则无值
                          if (!cell.getStringCellValue().equals("")) {
                            value = cell.getStringCellValue();
                         }  else {
                            value = cell.getNumericCellValue() + "";
                         }
                          break;
                      case HSSFCell.CELL_TYPE_BLANK:
                          break;
                      case HSSFCell.CELL_TYPE_ERROR:
                         value = "";
                          break;
                      case HSSFCell.CELL_TYPE_BOOLEAN:
                         value = (cell.getBooleanCellValue() ==  true ? "Y"
                                : "N");
                          break;
                      default:
                         value = "";
                     }
                  }
                   if (columnIndex == 0 && value.trim().equals("")) {
                      break;
                  }
                  values[columnIndex] = value.trim();
                  hasValue =  true;
              }
               if (hasValue) {
                  result.add(values);
              }
           }
       }
       in.close();
       String[][] returnArray =  new String[result.size()][rowSize];
        for ( int i = 0; i < returnArray.length; i++) {
           returnArray[i] = (String[]) result.get(i);
       }
        return returnArray;
    }

}