Question

嗨，大家好我是java的新手。在我的程序中，我可以选择文本文件并阅读它们。我需要在不使用数据库的情况下将这些读取文件写入excel文件。我写了这些代码。

我使用Object Array插入数据，但我不需要逐个编写整个文本文件内容。

任何人都可以帮助我......提前致谢。

我的代码

public class FirstExample {

public static void main(String[] args) throws FileNotFoundException, IOException, BiffException, WriteException {


    String excelFilePath="C:\\Users\\Morlot\\Desktop\\Dosy1.xlsx";


    try{
        FileInputStream inpStr=new FileInputStream(new File(excelFilePath));

        org.apache.poi.ss.usermodel.Workbook wbook= org.apache.poi.ss.usermodel.WorkbookFactory.create(inpStr);
        org.apache.poi.ss.usermodel.Sheet sheet=wbook.getSheetAt(0);

        Object[][] bookData= {{

“20.938”，“0.2670”，“304.66”，“0.6196”，“0.0000”，“0.0000”，“ - 20.971”，“0.1377”，“ - 1.5959”，“ - 0.4619”，“ - 0.4605” ，“ - 199.15”，“100.03”，“ - 0.0007”，“0.0030”，“0.2314”，“0.0031”，“ - 299.51”，“14：51：06 \ n”}，{
                    “20.938”，“0.2670”，“304.66”，“0.6249”，“0.0000”，“0.0000”，“ - 20.971”，“0.1252”，“ - 1.6774”，“ - 0.4240”，“ - 0.4213”，“ - 297.19“，”100.03“，” - 0.0006“，”0.0029“，”0.2279“，”0.0031“，” - 2002.51“，”14：51：09 \ n“}，{
                    “20.938”，“0.2670”，“304.67”，“0.6286”，“0.0000”，“0.0000”，“ - 20.971”，“0.1000”，“ - 1.7182”，“ - 0.3423”，“ - 0.3412”，“ - 293.18“，”99.934“，”0.0013“，”0.0027“，”0.2288“，”0.0031“，” - 2002.51“，”14：51：12 \ n“}，{
                    “20.937”，“0.2670”，“304.67”，“0.6342”，“0.0000”，“0.1249”，“ - 。20.846”，“0.0964”，“ - 1.7998”，“ - 0.3332”，“ - 0.3310”，“ - 291.19“，”99.979“，”0.0004“，”0.0026“，”0.2316“，”0.0031“，” - 2002.51“，”14:51:15 \ n“             }};

        int rowCount=sheet.getFirstRowNum();

        for(Object[] dataBook : bookData){
            Row row=sheet.getRow(++rowCount);

              int columnCount=0;

            org.apache.poi.ss.usermodel.Cell cell= row.createCell(columnCount);
            cell.setCellValue(rowCount);

            for(Object field : dataBook){
                cell= row.createCell(++columnCount);
                if(field instanceof String){
                    cell.setCellValue((String) field);
                }else if(field instanceof Integer){
                    cell.setCellValue((Integer) field);
                }

            }
        }
        inpStr.close();

        FileOutputStream opStr= new FileOutputStream("C:\\Users\\Morlot\\Desktop\\Dosy1.xlsx");
        System.out.println(excelFilePath + "data2 is written succesfully");
                    //10 kasım init text verisini excele yazdırma komutu 

        wbook.write(opStr);
        wbook.close();




    }catch(IOException | EncryptedDocumentException 
            | InvalidFormatException ex){
        ex.printStackTrace();
    }

}

excel file

3

Answer 1

更简单的解决方法，另存为* .csv文件。它是一个文本文件，其中包含一些规则作为链接解释：

https://en.wikipedia.org/wiki/Comma-separated_values

它可以由任何excel

引导

Answer 2

您需要将数据导出为* .csv。我有一个类似的问题，这篇文章非常有帮助： https://www.mkyong.com/java/how-to-export-data-to-csv-file-java/

以下是相关部分：

CSVUtils.java

package com.mkyong.utils;

import java.io.IOException;
import java.io.Writer;
import java.util.List;

public class CSVUtils {

    private static final char DEFAULT_SEPARATOR = ',';

    public static void writeLine(Writer w, List<String> values) throws IOException {
        writeLine(w, values, DEFAULT_SEPARATOR, ' ');
    }

    public static void writeLine(Writer w, List<String> values, char separators) throws IOException {
        writeLine(w, values, separators, ' ');
    }

    //https://tools.ietf.org/html/rfc4180
    private static String followCVSformat(String value) {

        String result = value;
        if (result.contains("\"")) {
            result = result.replace("\"", "\"\"");
        }
        return result;

    }

    public static void writeLine(Writer w, List<String> values, char separators, char customQuote) throws IOException {

        boolean first = true;

        //default customQuote is empty

        if (separators == ' ') {
            separators = DEFAULT_SEPARATOR;
        }

        StringBuilder sb = new StringBuilder();
        for (String value : values) {
            if (!first) {
                sb.append(separators);
            }
            if (customQuote == ' ') {
                sb.append(followCVSformat(value));
            } else {
                sb.append(customQuote).append(followCVSformat(value)).append(customQuote);
            }

            first = false;
        }
        sb.append("\n");
        w.append(sb.toString());


    }

}

CVSUtilExample.java

package com.mkyong.utils;

import java.io.FileWriter;
import java.util.Arrays;

public class CVSUtilExample {

    public static void main(String[] args) throws Exception {

        String csvFile = "/Users/mkyong/csv/abc.csv";
        FileWriter writer = new FileWriter(csvFile);

        CSVUtils.writeLine(writer, Arrays.asList("a", "b", "c", "d"));

        //custom separator + quote
        CSVUtils.writeLine(writer, Arrays.asList("aaa", "bb,b", "cc,c"), ',', '"');

        //custom separator + quote
        CSVUtils.writeLine(writer, Arrays.asList("aaa", "bbb", "cc,c"), '|', '\'');

        //double-quotes
        CSVUtils.writeLine(writer, Arrays.asList("aaa", "bbb", "cc\"c"));


        writer.flush();
        writer.close();

    }

}

如何用Java

2 个答案:

CSVUtils.java

CVSUtilExample.java