如何将控制台输出写入 Java 中的 Excel 文件

Question

大家好，我是 java 的新人。在我的程序中，我可以 select 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的文件写入 excel 文件。我写了这些代码。

我使用对象数组插入数据，但我不需要一一写入文本文件的全部内容。

任何人都可以帮助我...在此先感谢。

Program GUI

我的代码

public class 第一个例子 {

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","-299.15","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","-299.51","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","-299.51","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","-299.51","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。它是一个包含一些规则的文本文件，如 link 解释：

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

任何人都可以阅读excel

Answer 2

您需要将数据导出为 *.csv。我曾经遇到过类似的问题，这个 post 非常有帮助： https://www.mkyong.com/java/how-to-export-data-to-csv-file-java/

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();

    }

}

如何将控制台输出写入 Java 中的 Excel 文件

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