最近在實施一個項目,其中一項工作是處理歷史數據。客戶提供過來的數據是excel表格,超過20萬條記錄,由於目標系統導入限制,每次只能導入大小不超過8M的文件,所以需要對這些數據進行分割處理。在手工處理一遍後,覺得可以通過寫一個程序來自動實現分割,於是用JAVA寫了一個程序,用於針對特定文件實現給定記錄數的分割功能。
詳見代碼:
package cn.sean.main;
import java.io.File;
import java.io.IOException;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;
public class AccessExcel {
Cell[] titleCell;
Cell[][] allCell;
jxl.Workbook workBook;
Sheet sheet;
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String url = "c:\\a.xls";
AccessExcel ae = new AccessExcel();
ae.readExcel(url);
ae.splitExcel(500, "c:\\");
}
/*
* 讀取原excel文件,並將相關的數據存儲到數組中
*/
public void readExcel(String source) {
File file = new File(source);
try {
workBook = Workbook.getWorkbook(file);
sheet = workBook.getSheet(0);
titleCell = new Cell[sheet.getColumns()];// 用於存儲列標題
allCell = new Cell[sheet.getColumns()][sheet.getRows()];// 用於存儲所有單元格數據
// 將列標題存儲存到一個一維數組中
for (int i = 0; i < titleCell.length; i++) {
titleCell[i] = sheet.getCell(i, 0);
}
// 將所有單元格數據存儲到一個二維數組中
for (int i = 0; i < sheet.getColumns(); i++) {
for (int j = 0; j < sheet.getRows(); j++) {
allCell[i][j] = sheet.getCell(i, j);
}
}
} catch (BiffException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*
*@param number代表需要分隔的行數
*@param destination代表分隔文件後存儲的路徑
*/
public void splitExcel(int number, String destination) {
int index = (int) Math.ceil(sheet.getRows() / number);//計算需要分隔多少個文件
File[] files = new File[index + 1];
//初始化文件數組
for (int i = 0; i <= index; i++) {
files[i] = new File(destination + i + ".xls");
}
int n = number;
int y = 1;//用於記錄行的位置
for (int i = 0; i <= index; i++) {
try {
jxl.write.WritableWorkbook ww = Workbook
.createWorkbook(files[i]);
WritableSheet ws = ww.createSheet("sheet1", 0);
for (int t = 0; t < sheet.getColumns(); t++) {
ws.addCell(new Label(t, 0, allCell[t][0].getContents()));
}
out: for (int m = 1; y < sheet.getRows(); y++, m++) {
for (int x = 0; x < sheet.getColumns(); x++) {
if (y >number) {
number += n;
break out;
}
ws.addCell(new Label(x, m, allCell[x][y].getContents()));
}
}
ww.write();
ww.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (RowsExceededException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (WriteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}