Question

所以我想要完成的是在列的每个单元格下写一个数据数组，以获得尽可能多的数组元素。我希望我在excel中也看起来像这样：

buyer | parts |  price| quantity  | comments
tom   | blah  | 546   | 5         |   blah
      |  blah | 56    |  67       |

我的文件列数量多于此数，但我想举一个简短的例子。什么也造成我的问题是，我不想打印作者在完成我的阵列数据集后最后一行上的下一列，所以我希望它在那个forst线上。我已经调查过其他图书馆来完成这项任务，但我找不到任何可以满足我需求的东西。我明白CSV文件的性质可能不允许这种情况发生，没有手动添加空白单元格，但有没有其他方法可以做到这一点？

Enumeration <String> paramNames = request.getParameterNames();
        while(paramNames.hasMoreElements()) 
        {
            String paramName = (String)paramNames.nextElement();
                            writer.append(paramName);
            writer.append(',');
            String[] paramValues = request.getParameterValues(paramName);
            if (paramValues.length == 1)
            {
                String paramValue = paramValues[0];
                if (paramValue.length() == 0)
                {
                    writer.append("No Value");
                    writer.append('\n');
                }
                else
                {
                    writer.append(paramValue);
                    writer.append('\n');
                }
            }
            else
            {
                for(int i = 0; i<paramValues.length; i++)
                {
                    writer.append(paramValues[i]);
                    writer.append(',');
                }
                writer.append('\n');
            }
            previousname = paramName;

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

还要澄清这些数据的来源，一个位于表单中间的JSP表，所以我正在读取表中的值数组。

Answer 1

来自：http://javacodeonline.blogspot.ca/2009/09/java-code-to-write-to-csv-file.html

/** The below Java Code writes 
 * some data to a file in CSV
 * (Comma Separated Value) File
 */

package developer;

import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

public class MakeCSVFile {

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

        //Note the "\\" used in the path of the file 
        //instead of "\", this is required to read 
        //the path in the String format.
        FileWriter fw = new FileWriter("D:\\JavaCodeFile\\WriteTest.csv");
        PrintWriter pw = new PrintWriter(fw);

        //Write to file for the first row
        pw.print("Hello guys");
        pw.print(",");
        pw.print("Java Code Online is maing");
        pw.print(",");
        pw.println("a csv file and now a new line is going to come");

        //Write to file for the second row
        pw.print("Hey");
        pw.print(",");
        pw.print("It's a");
        pw.print(",");
        pw.print("New Line");

        //Flush the output to the file
        pw.flush();

        //Close the Print Writer
        pw.close();

        //Close the File Writer
        fw.close();        
    }
}

可能不是做硬打印而是做一个数组循环并打印用逗号分隔的每个值。

类似的东西：

Array array;

    Iterator<String> iter = array.iterator();
    while (iter.hasNext())
    {
        object = iter.next();
        pw.print(object.getBuyer());
        pw.print(",");
        pw.print(object.getTitle());
        ..          
    }

Answer 2

如果您使用Java编写CSV文件，请考虑使用OpenCSV库。

在java中的csv文件的列中写一个字符串数组

2 个答案: