JAVA 關於web頁面下載匯出Excel通用方法
阿新 • • 發佈：2018-11-26
最近整理匯出Excel，這種情況是不存在實體類方式，只要按照這種資料格式編寫，就可以出來效果了。
1.需要的的jar包：
poi-ooxml-3.9.jar
serlet.api.jar
缺少的包自己去下就可以，都是常用的包，這裡就不一一寫出來了
下面看程式碼：
公共的類：
package com.by; import org.apache.poi.hssf.usermodel.*; import org.apache.poi.hssf.util.HSSFColor; import org.apache.poi.ss.util.CellRangeAddress; importjavax.servlet.http.HttpServletResponse; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; /** * 匯出Excel公共方法 * * @author zhanghb * @version 1.0 */ public class CommonExcel { //顯示的匯出表的標題 private String title; //匯出表的列名 private String[] rowName; //匯出的檔名 private String fileName; private List<Object[]> dataList = new ArrayList<Object[]>(); private HttpServletResponse response; //構造方法，傳入要匯出的資料 public CommonExcel(String title, String[] rowName, List<Object[]> dataList, HttpServletResponse response, String fileName) { this.dataList = dataList; this.rowName = rowName; this.title = title; this.response = response; this.fileName = fileName; } /* * 匯出資料 */ public void downloadExcel() throws Exception { try { HSSFWorkbook workbook = new HSSFWorkbook(); // 建立工作簿物件 HSSFSheet sheet = workbook.createSheet(title); // 建立工作表 // 產生表格標題行 HSSFRow rowm = sheet.createRow(0); HSSFCell cellTiltle = rowm.createCell(0); //sheet樣式定義【getColumnTopStyle()/getStyle()均為自定義方法 - 在下面 - 可擴充套件】 HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//獲取列頭樣式物件 HSSFCellStyle style = this.getStyle(workbook); //單元格樣式物件 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) // 將列頭設定到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); //設定列頭單元格的資料型別 HSSFRichTextString text = new HSSFRichTextString(rowName[n]); cellRowName.setCellValue(text); //設定列頭單元格的值 cellRowName.setCellStyle(columnTopStyle); //設定列頭單元格樣式 } //將查詢出的資料設定到sheet對應的單元格中 for (int i = 0; i < dataList.size(); i++) { Object[] obj = dataList.get(i);//遍歷每個物件 HSSFRow row = sheet.createRow(i + 3);//建立所需的行數 for (int j = 0; j < obj.length; j++) { HSSFCell cell = null; //設定單元格的資料型別 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()); //設定單元格的值 } } cell.setCellStyle(style); //設定單元格樣式 } } //讓列寬隨著匯出的列長自動適應 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 { if (response != null) { response.setContentType("application/vnd.ms-excel;charset=utf-8"); response.setHeader("Content-Disposition", "attachment;filename=\""+new String(fileName.getBytes("gb2312"),"ISO8859-1")); OutputStream out = response.getOutputStream(); workbook.write(out); out.close(); } else { FileOutputStream outputStream = new FileOutputStream("D:/"+fileName); workbook.write(outputStream); outputStream.close(); } } catch (IOException e) { e.printStackTrace(); } } } catch (Exception e) { e.printStackTrace(); } } /* * 列頭單元格樣式 */ public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) { // 設定字型 HSSFFont font = workbook.createFont(); //設定字型大小 font.setFontHeightInPoints((short) 12); //字型加粗 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //設定字型名字 font.setFontName("微軟雅黑"); //設定樣式; HSSFCellStyle style = workbook.createCellStyle(); //設定底邊框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //設定底邊框顏色; style.setBottomBorderColor(HSSFColor.BLACK.index); //設定左邊框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //設定左邊框顏色; style.setLeftBorderColor(HSSFColor.BLACK.index); //設定右邊框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //設定右邊框顏色; style.setRightBorderColor(HSSFColor.BLACK.index); //設定頂邊框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //設定頂邊框顏色; style.setTopBorderColor(HSSFColor.BLACK.index); //在樣式用應用設定的字型; style.setFont(font); //設定自動換行; style.setWrapText(false); //設定水平對齊的樣式為居中對齊; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //設定垂直對齊的樣式為居中對齊; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } /* * 列資料資訊單元格樣式 */ public HSSFCellStyle getStyle(HSSFWorkbook workbook) { // 設定字型 HSSFFont font = workbook.createFont(); //設定字型名字 font.setFontName("微軟雅黑"); //設定樣式; HSSFCellStyle style = workbook.createCellStyle(); //設定底邊框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //設定底邊框顏色; style.setBottomBorderColor(HSSFColor.BLACK.index); //設定左邊框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //設定左邊框顏色; style.setLeftBorderColor(HSSFColor.BLACK.index); //設定右邊框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //設定右邊框顏色; style.setRightBorderColor(HSSFColor.BLACK.index); //設定頂邊框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //設定頂邊框顏色; style.setTopBorderColor(HSSFColor.BLACK.index); //在樣式用應用設定的字型; style.setFont(font); //設定自動換行; style.setWrapText(false); //設定水平對齊的樣式為居中對齊; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //設定垂直對齊的樣式為居中對齊; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } }
2.測試方法
public static void main(String[] args)throws Exception { HttpServletResponse response=null; String title = "xx報表"; String[] rowsName = new String[]{"oo","xx","oo","xx","xx","oo"}; List<Object[]> dataList = new ArrayList<Object[]>(); Object[] objs = null; for (int i = 0; i < 10; i++) { objs = new Object[rowsName.length]; objs[0] = i; objs[1] = i; objs[2] = i; objs[3] = i; objs[4] = i; SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String date = df.format(new Date()); objs[5] = date; dataList.add(objs); } String fileName="xx報表-"+String.valueOf(System.currentTimeMillis()).substring(4,13)+".xls"; CommonExcel ex = new CommonExcel(title, rowsName, dataList,response,fileName); ex.downloadExcel(); }3.以上就是全部的匯出方法以及測試方法
4.那麼在頁面上只需要寫js呼叫的你controller方法就行了
5.匯出的結果：
