java 用jxl匯出XLS檔案,大量資料多個sheet儲存
阿新 • • 發佈:2019-02-18
import java.io.File; import java.util.ArrayList; import java.util.List; import jxl.Workbook; import jxl.write.Label; import jxl.write.NumberFormats; import jxl.write.WritableCellFormat; import jxl.write.WritableSheet; import jxl.write.WritableWorkbook; public class ExportXls { /** * @param args */ /** * @param args */ public static void main(String[] args) { // 一行表頭 List<String> headList = new ArrayList<String>(); for (int i = 0; i < 6; i++) { headList.add("Head" + i); } // 一行資料 List<String> row = new ArrayList<String>(); for (int i = 0; i < 6; i++) { row.add("body" + i); } // 全部資料 List<List<String>> data = new ArrayList<List<String>>(); for (int i = 0; i < 100000; i++) { data.add(row); } writeIntoXLS(headList, data, "C:/Result.xls"); }
private static int sheetSize = 10000;
public static void writeIntoXLS(List<String> headList, List<List<String>> bodyList, String xlsFull) { WritableWorkbook wwb= null; try{ int sheetNum = 1;//當前sheet索引 int recNum = 0; // 當前記錄索引 //生成xls檔案 File writeFile = new File(xlsFull); //檢查檔案是否已存在,存在則刪除 if(writeFile.exists()) writeFile.delete(); //建立新的檔案 writeFile.createNewFile(); //整理資料流,WritableWorkbook wwb = Workbook.createWorkbook(writeFile); //開始分SHEET,寫資料 while(true){ int rowNum = 0; String sheetName = "sheet" + sheetNum; //建立SHEET WritableSheet ws = wwb.createSheet(sheetName, sheetNum); sheetNum++; // 設定樣式 WritableCellFormat format = new WritableCellFormat( NumberFormats.TEXT); //寫入表頭資訊 for(int i = 0; i < headList.size(); i++) { ws.addCell(new Label(i, rowNum, headList.get(i), format)); } rowNum++; //寫入表資料行資訊 if(!bodyList.isEmpty()) { int sheetRecNum = 0; for(int i = recNum; i < bodyList.size(); i++, recNum++, rowNum++, sheetRecNum++) { //單個SHEET資料行超過SHEET應達到資料限額,則停止寫入 if(sheetRecNum >= sheetSize) break; List<String> row = bodyList.get(i); for(int j=0; j<row.size(); j++) { ws.addCell(new Label(j, rowNum, row.get(j).toString(), format)); } } } //wwb.write();--------------不能放到這裡,移到下面(這個是從網上看到別人的經驗得來) //資料寫完,退出 if(recNum >= bodyList.size()) break; } //PUSH當前內容到XLS檔案中--------這一步很關鍵,sheet寫好之後就要push到xls檔案中,然後再新建 wwb.write(); } catch(Exception e) { e.printStackTrace(); } finally { //關閉所有資料流 try { wwb.close(); } catch(Exception e) { } Runtime r = Runtime.getRuntime(); Process p = null ; String cmd[] = {"C:\\Program Files\\Microsoft Office\\Office12\\EXCEL.EXE" , "c:\\Result.xls" }; try { p = r.exec(cmd); } catch (Exception e){ System.out.println("error executing: " +cmd[ 0 ]); } } } }