[英]writing an array of strings down a column of a csv file in java
因此,我要完成的工作是在该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中也像这样:
buyer | parts | price| quantity | comments
tom | blah | 546 | 5 | blah
| blah | 56 | 67 |
我的文件比这多得多的列,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它之后的下一列,因此我希望它位于那一行上。 我已经研究了其他库来完成此任务,但是没有什么可以满足我的需求的。 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?
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();
}
还为了弄清楚该数据来自何处,在表单中间是一个JSP表,因此我正在读取表中的值数组。
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();
}
}
可能不进行硬打印,而是循环数组并打印每个值,并用逗号分隔。
就像是 :
Array array;
Iterator<String> iter = array.iterator();
while (iter.hasNext())
{
object = iter.next();
pw.print(object.getBuyer());
pw.print(",");
pw.print(object.getTitle());
..
}
如果要使用Java编写CSV文件,请考虑使用OpenCSV库。
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