Question

我正在创建一个java程序来读取excel表并创建一个逗号分隔文件。当我运行带有空白列的示例excel文件时，第一行工作正常，但其余行跳过空白单元格。我已经阅读了将空白单元格插入行所需的代码更改，但我的问题是为什么第一行有效？???

public ArrayList OpenAndReadExcel(){
    FileInputStream file = null;
    HSSFWorkbook workBook = null;
    ArrayList <String> rows = new ArrayList();

    //open the file

    try {
         file = new FileInputStream(new File("Fruity.xls"));
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        System.out.println("Could not open Input File");
        e.printStackTrace();
    }

    //  open the input stream as a workbook

        try {
             workBook = new HSSFWorkbook(file);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            System.out.println("Can't Open HSSF workbook");
            e.printStackTrace();
        }

        // get the sheet
        HSSFSheet sheet = workBook.getSheetAt(0);

        // add an iterator for every row and column
        Iterator<Row> rowIter = sheet.rowIterator();

        while (rowIter.hasNext())
        {

            String rowHolder = "";
            HSSFRow row = (HSSFRow) rowIter.next();
            Iterator<Cell> cellIter = row.cellIterator();
            Boolean first =true;
            while ( cellIter.hasNext())
            {
                if (!first)
                    rowHolder = rowHolder + ",";

                HSSFCell cell = (HSSFCell) cellIter.next();

                rowHolder = rowHolder + cell.toString() ;
                first = false;
            }

            rows.add(rowHolder);

        }

    return rows;

}
public void WriteOutput(ArrayList<String> rows) {

    // TODO Auto-generated method stub
    PrintStream outFile ;
    try {


        outFile = new PrintStream("fruity.txt");
        for(String row : rows)
        {   
            outFile.println(row);
        }
        outFile.close();

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

}
-----
我输入.xls文件（抱歉不知道如何在这里插入excel表）

名称＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;原产地＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;原产地＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;级＆GT;＆GT;＆GT;＆GT;＆GT;＆GT;没有月份 Apple＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;美国＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;华盛顿＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; A＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; 6
橙色＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;美国＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;佛罗里达州＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; A＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; 9
菠萝＆GT;＆GT;＆GT;＆GT;＆GT;美国＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;夏威夷＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; B＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; 10个
草莓＆GT;＆GT;＆GT;＆GT;美国＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;新泽西州＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; C＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; 3

我的输出文本文件
名称，原产国，原产地,,,等级，月份号苹果，美国，华盛顿，A，6.0
橙色，美国，佛罗里达，A，9.0
菠萝，USA，夏威夷，B，10.0
草莓，美国，新泽西州，C，3.0

Notice the two extra commas before the Grade column... This is because I have two blank columns there.<br/>

输出的其余部分缺少这些额外的逗号。

我正在使用Apache Poi-3.9-20121203.jar

Answer 1

您应该阅读Apache POI网站上的Iterating Over Rows and Cells documentation。

CellIterator将仅返回已在文件中定义的单元格，这主要是指具有值或格式的单元格。 excel文件格式稀疏，并且不打算存储既没有值也没有格式化的单元格。

对于您的情况，您必须将格式应用于第一行，这会导致它们显示出来。

您需要通读documentation并按索引切换到查找。这也将允许您完全控制代码中处理空白与未使用单元格的方式。

apache poi cellIterator跳过空白单元格但不在第一行

1 个答案: