在Java中的csv文件的列中写入字符串数组 [英] writing an array of strings down a column of a csv file in java
问题描述
所以我要完成的工作是在列的每个单元格中写入一个数据数组,以容纳我拥有的许多数组元素。我希望我在excel中也是如此:
so what i am trying to accomplish is to write an array of data down each cell of the column for as many array elements that i have. i want i too look like this in excel:
buyer | parts | price| quantity | comments
tom | blah | 546 | 5 | blah
| blah | 56 | 67 |
我的文件中的列比这多得多,但我想举一个简单的例子。也造成我问题的是,一旦完成数组数据集,我就不想在编写器所在的最后一行上打印后的下一列,所以我希望它位于该行的最前面。我已经研究过其他图书馆来实现这一目标,但是我找不到满足我需要的东西。我确实了解CSV文件的性质,如果不手动添加空白单元格,可能不允许这种情况发生,但是还有其他方法可以做到这一点吗?
my file has manyyyyy more columns than this but i wanted to give a brief example. what also creates my problem is that i dont want to print the next column after it on the last row that the writer is on once its done my array data set, so i want it to be on that forst line. i have looked into other libraries for accomplishing this, but there is nothing that i can find that seems to meet my needs. i do understand the nature of CSV file may not allow this to happen, without manually adding in blank cells, but is there any other way to do this?
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();
}
还要弄清楚该数据来自何处,表格的中间,所以我正在读取表中的值数组。
also to clarify where this data is coming from, a JSP table thats in the middle of the form, so i am reading in arrays of values that are in the table.
推荐答案
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();
}
}
可能不做硬印刷,而是做一个循环
Probably instead of doing hard print do a loop of the array and print each value separated by a comma.
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());
..
}
这篇关于在Java中的csv文件的列中写入字符串数组的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!