最先開始的時候作過一些數據Excel導出的功能,可是到後期每一次導出都須要寫一些差很少相似的代碼,稍微研究了一下寫了個公共的導出方法。java
這裏用的是POI,而後寫成了一個公共類,傳入設置好格式的數據,就能彈出下載框。apache
package com.hwt.glmf.common; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import javax.servlet.http.HttpServletResponse; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFFont; import org.apache.poi.hssf.usermodel.HSSFRichTextString; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.hssf.util.CellRangeAddress; import org.apache.poi.hssf.util.HSSFColor; /** * 導出Excel公共方法 * @version 1.0 * * @author wangcp * */ public class ExportExcel extends BaseAction { //顯示的導出表的標題 private String title; //導出表的列名 private String[] rowName ; private List<Object[]> dataList = new ArrayList<Object[]>(); HttpServletResponse response; //構造方法,傳入要導出的數據 public ExportExcel(String title,String[] rowName,List<Object[]> dataList){ this.dataList = dataList; this.rowName = rowName; this.title = title; } /* * 導出數據 * */ public void export() throws Exception{ try{ HSSFWorkbook workbook = new HSSFWorkbook(); // 建立工做簿對象 HSSFSheet sheet = workbook.createSheet(title); // 建立工做表 // 產生表格標題行 HSSFRow rowm = sheet.createRow(0); HSSFCell cellTiltle = rowm.createCell(0); //sheet樣式定義【getColumnTopStyle()/getStyle()均爲自定義方法 - 在下面 - 可擴展】 HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//獲取列頭樣式對象 HSSFCellStyle style = this.getStyle(workbook); //單元格樣式對象 sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1))); cellTiltle.setCellStyle(columnTopStyle); cellTiltle.setCellValue(title); // 定義所需列數 int columnNum = rowName.length; HSSFRow rowRowName = sheet.createRow(2); // 在索引2的位置建立行(最頂端的行開始的第二行) // 將列頭設置到sheet的單元格中 for(int n=0;n<columnNum;n++){ HSSFCell cellRowName = rowRowName.createCell(n); //建立列頭對應個數的單元格 cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); //設置列頭單元格的數據類型 HSSFRichTextString text = new HSSFRichTextString(rowName[n]); cellRowName.setCellValue(text); //設置列頭單元格的值 cellRowName.setCellStyle(columnTopStyle); //設置列頭單元格樣式 } //將查詢出的數據設置到sheet對應的單元格中 for(int i=0;i<dataList.size();i++){ Object[] obj = dataList.get(i);//遍歷每一個對象 HSSFRow row = sheet.createRow(i+3);//建立所需的行數 for(int j=0; j<obj.length; j++){ HSSFCell cell = null; //設置單元格的數據類型 if(j == 0){ cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC); cell.setCellValue(i+1); }else{ cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING); if(!"".equals(obj[j]) && obj[j] != null){ cell.setCellValue(obj[j].toString()); //設置單元格的值 } } cell.setCellStyle(style); //設置單元格樣式 } } //讓列寬隨着導出的列長自動適應 for (int colNum = 0; colNum < columnNum; colNum++) { int columnWidth = sheet.getColumnWidth(colNum) / 256; for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) { HSSFRow currentRow; //當前行未被使用過 if (sheet.getRow(rowNum) == null) { currentRow = sheet.createRow(rowNum); } else { currentRow = sheet.getRow(rowNum); } if (currentRow.getCell(colNum) != null) { HSSFCell currentCell = currentRow.getCell(colNum); if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) { int length = currentCell.getStringCellValue().getBytes().length; if (columnWidth < length) { columnWidth = length; } } } } if(colNum == 0){ sheet.setColumnWidth(colNum, (columnWidth-2) * 256); }else{ sheet.setColumnWidth(colNum, (columnWidth+4) * 256); } } if(workbook !=null){ try { String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls"; String headStr = "attachment; filename=\"" + fileName + "\""; response = getResponse(); response.setContentType("APPLICATION/OCTET-STREAM"); response.setHeader("Content-Disposition", headStr); OutputStream out = response.getOutputStream(); workbook.write(out); } catch (IOException e) { e.printStackTrace(); } } }catch(Exception e){ e.printStackTrace(); } } /* * 列頭單元格樣式 */ public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) { // 設置字體 HSSFFont font = workbook.createFont(); //設置字體大小 font.setFontHeightInPoints((short)11); //字體加粗 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //設置字體名字 font.setFontName("Courier New"); //設置樣式; HSSFCellStyle style = workbook.createCellStyle(); //設置底邊框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //設置底邊框顏色; style.setBottomBorderColor(HSSFColor.BLACK.index); //設置左邊框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //設置左邊框顏色; style.setLeftBorderColor(HSSFColor.BLACK.index); //設置右邊框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //設置右邊框顏色; style.setRightBorderColor(HSSFColor.BLACK.index); //設置頂邊框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //設置頂邊框顏色; style.setTopBorderColor(HSSFColor.BLACK.index); //在樣式用應用設置的字體; style.setFont(font); //設置自動換行; style.setWrapText(false); //設置水平對齊的樣式爲居中對齊; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //設置垂直對齊的樣式爲居中對齊; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } /* * 列數據信息單元格樣式 */ public HSSFCellStyle getStyle(HSSFWorkbook workbook) { // 設置字體 HSSFFont font = workbook.createFont(); //設置字體大小 //font.setFontHeightInPoints((short)10); //字體加粗 //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //設置字體名字 font.setFontName("Courier New"); //設置樣式; HSSFCellStyle style = workbook.createCellStyle(); //設置底邊框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //設置底邊框顏色; style.setBottomBorderColor(HSSFColor.BLACK.index); //設置左邊框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //設置左邊框顏色; style.setLeftBorderColor(HSSFColor.BLACK.index); //設置右邊框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //設置右邊框顏色; style.setRightBorderColor(HSSFColor.BLACK.index); //設置頂邊框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //設置頂邊框顏色; style.setTopBorderColor(HSSFColor.BLACK.index); //在樣式用應用設置的字體; style.setFont(font); //設置自動換行; style.setWrapText(false); //設置水平對齊的樣式爲居中對齊; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //設置垂直對齊的樣式爲居中對齊; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } }
這個導出用到的方法,組裝數據的以下:數組
String title = Message.getString("manifestIExportTitle"); String[] rowsName = new String[]{"序號","貨物運輸批次號","提運單號","狀態","錄入人","錄入時間"}; List<Object[]> dataList = new ArrayList<Object[]>(); Object[] objs = null; for (int i = 0; i < manifestIMainList.size(); i++) { ManifestIMain man = manifestIMainList.get(i); objs = new Object[rowsName.length]; objs[0] = i; objs[1] = man.getTranNo(); objs[2] = man.getBillNo(); objs[3] = man.getStatusFlagCnName(); objs[4] = man.getLoginName(); SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String date = df.format(man.getModiDate()); objs[5] = date; dataList.add(objs); } ExportExcel ex = new ExportExcel(title, rowsName, dataList); ex.export();
是經過組裝一個List<Object>的類型(裏面是一些列的導出數據,能夠爲String/int/long等所有數據類型)。數組rowsName是指導出數據的欄位名稱,title是指導出excel的標題字體
和sheet名。this
以以上的數據爲例,導出的結果顯示以下(只是作了簡單的處理,有一些合併行與excel的樣式問題沒有涉及):spa