匯入/匯出Excel利用apache.poi
阿新 • • 發佈：2019-02-16
一、生成Excel
1、匯入jar包
maven地址
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.16</version>
</dependency> 2、編寫ExcelUtil工具類
package com.qn.yun.utils; import org.apache.poi.hssf.util.HSSFColor.HSSFColorPredefined; import org.apache.poi.ss.usermodel.BorderStyle; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.FillPatternType; import org.apache.poi.ss.usermodel.Font; import org.apache.poi.ss.usermodel.HorizontalAlignment; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.VerticalAlignment; import org.apache.poi.ss.usermodel.Workbook; public class ExcelUtil { private Workbook wb = null; private Sheet sheet = null; public ExcelUtil(Workbook wb, Sheet sheet) { super(); this.wb = wb; this.sheet = sheet; } /** * 設定表頭樣式 * * @return */ public CellStyle getHeadStyle() { // 建立單元格樣式 CellStyle cellStyle = wb.createCellStyle(); // 設定單元格的背景顏色為淡藍色 cellStyle.setFillForegroundColor(HSSFColorPredefined.LIGHT_YELLOW.getIndex()); cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND); // 設定單元格居中對齊 cellStyle.setAlignment(HorizontalAlignment.CENTER); // 設定單元格垂直居中對齊 cellStyle.setVerticalAlignment(VerticalAlignment.CENTER); // 建立單元格內容顯示不下時自動換行 cellStyle.setWrapText(true); // 設定單元格字型樣式 Font font = wb.createFont(); // 設定字型加粗 font.setBold(true); font.setFontName("宋體"); font.setFontHeight((short) 200); cellStyle.setFont(font); // 設定單元格邊框為細線條 cellStyle.setBorderLeft(BorderStyle.THIN); cellStyle.setBorderBottom(BorderStyle.THIN); cellStyle.setBorderRight(BorderStyle.THIN); cellStyle.setBorderTop(BorderStyle.THIN); return cellStyle; } public void buildTitle(Sheet sheet, String[] titles) { Row headRow = sheet.createRow(0); Cell cell = null; for (int i = 0; i < titles.length; i++) { cell = headRow.createCell(i); cell.setCellStyle(getHeadStyle()); cell.setCellValue(titles[i]); } } /** * 設定表體的單元格樣式 * * @return */ public CellStyle getBodyStyle() { // 建立單元格樣式 CellStyle cellStyle = wb.createCellStyle(); // 設定單元格居中對齊 cellStyle.setAlignment(HorizontalAlignment.CENTER); // 設定單元格垂直居中對齊 cellStyle.setVerticalAlignment(VerticalAlignment.CENTER); // 建立單元格內容顯示不下時自動換行 cellStyle.setWrapText(true); // 設定單元格字型樣式 Font font = wb.createFont(); // 設定字型加粗 font.setBold(true); font.setFontName("宋體"); font.setFontHeight((short) 200); cellStyle.setFont(font); // 設定單元格邊框為細線條 cellStyle.setBorderLeft(BorderStyle.THIN); cellStyle.setBorderBottom(BorderStyle.THIN); cellStyle.setBorderRight(BorderStyle.THIN); cellStyle.setBorderTop(BorderStyle.THIN); return cellStyle; } public void autoSizeColumnSize(Sheet sheet) { if (sheet == null) { return; } if (sheet.getRow(0) == null) { return; } int colCount = sheet.getRow(0).getPhysicalNumberOfCells(); for (int column = 0; column < colCount; column++) { int columnWidth = sheet.getColumnWidth(column) / 256; for (int rowNum = 1; rowNum <= sheet.getLastRowNum(); rowNum++) { Row currentRow; if (sheet.getRow(rowNum) == null) { currentRow = sheet.createRow(rowNum); } else { currentRow = sheet.getRow(rowNum); } if (currentRow.getCell(column) != null) { Cell currentCell = currentRow.getCell(column); int length = currentCell.toString().length(); if (columnWidth < length) { columnWidth = length; } } } sheet.setColumnWidth(column, (columnWidth * 2) * 256); } } }
3、編寫資料內容service
package com.qn.demo; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.xssf.streaming.SXSSFWorkbook; import org.junit.Test; import com.qn.yun.utils.ExcelUtil; public class ExcelYunDemo { @Test public void outputExcel(){ SXSSFWorkbook workbook = new SXSSFWorkbook(100); Sheet sheet = workbook.createSheet("學生內容表"); ExcelUtil excelUtil = new ExcelUtil(workbook, sheet); //設計單元格樣式 CellStyle bodyStyle = excelUtil.getBodyStyle(); // 構建表頭 String[] titles={"姓名","性別","年齡"}; excelUtil.buildTitle(sheet, titles); Row bodyRow=sheet.createRow(1); Cell cell=bodyRow.createCell(0); cell.setCellValue("小明"); cell=bodyRow.createCell(1); cell.setCellValue("男"); cell=bodyRow.createCell(2); cell.setCellValue(12); excelUtil.autoSizeColumnSize(sheet); ByteArrayOutputStream out=new ByteArrayOutputStream(); try { workbook.write(out); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); System.err.println("匯出失敗"); }finally{ try { out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); System.err.println("關閉流失敗"); } } workbook.dispose(); byte[] byteArray = out.toByteArray(); OutputStream outputStream=null; try { outputStream=new FileOutputStream(new File("f://學生資訊.xlsx")); outputStream.write(byteArray); System.out.println("輸出ok"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); System.err.println("輸出失敗"); }finally { try { outputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }
4、匯出的表格中要合併單元格
/** * * @Project:Report * @Title:MergeCell.java * @Package:com.you.excel * @Description: * @Author:YouHaiDong * @Date:2015年11月4日 下午2:36:46 * @Version: */ package com.you.excel; import java.io.FileOutputStream; import org.apache.poi.hssf.usermodel.HSSFCell; 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.Region; /** * <p>合併單元格</p> * @ClassName:MergeCell * @Description: * @Author:YouHaiDong * @Date:2015年11月4日 下午2:36:46 * */ public class MergeCell { /** * 合併單元格 * @Title:MergeCell * @Description: * @param args * @Date:2015年11月4日 下午2:36:46 * @return: void * @throws Exception */ @SuppressWarnings({ "resource", "deprecation" }) public static void main(String[] args) throws Exception { //建立workbook HSSFWorkbook workbook = new HSSFWorkbook(); //建立sheet頁 HSSFSheet sheet = workbook.createSheet("學生表"); //建立單元格 HSSFRow row = sheet.createRow(0); HSSFCell c0 = row.createCell(0); c0.setCellValue(new HSSFRichTextString("學號")); HSSFCell c1 = row.createCell(1); c1.setCellValue(new HSSFRichTextString("姓名")); HSSFCell c2 = row.createCell(2); c2.setCellValue(new HSSFRichTextString("性別")); HSSFCell c3 = row.createCell(3); c3.setCellValue(new HSSFRichTextString("年齡")); HSSFCell c4 = row.createCell(4); c4.setCellValue(new HSSFRichTextString("2015年分數")); HSSFCell c5 = row.createCell(7); c5.setCellValue(new HSSFRichTextString("2014年分數")); HSSFRow row1 = sheet.createRow(1); HSSFCell c6 = row1.createCell(4); c6.setCellValue(new HSSFRichTextString("語文")); HSSFCell c7 = row1.createCell(5); c7.setCellValue(new HSSFRichTextString("數學")); HSSFCell c8 = row1.createCell(6); c8.setCellValue(new HSSFRichTextString("外語")); HSSFCell c9 = row1.createCell(7); c9.setCellValue(new HSSFRichTextString("語文")); HSSFCell c10 = row1.createCell(8); c10.setCellValue(new HSSFRichTextString("數學")); HSSFCell c11 = row1.createCell(9); c11.setCellValue(new HSSFRichTextString("外語")); Region region1 = new Region(0, (short)0, 1, (short)0); Region region2 = new Region(0, (short)1, 1, (short)1); Region region3 = new Region(0, (short)2, 1, (short)2); Region region4 = new Region(0, (short)3, 1, (short)3); Region region5 = new Region(0, (short)4, 0, (short)6); Region region6 = new Region(0, (short)7, 0, (short)9); sheet.addMergedRegion(region1); sheet.addMergedRegion(region2); sheet.addMergedRegion(region3); sheet.addMergedRegion(region4); sheet.addMergedRegion(region5); sheet.addMergedRegion(region6);
//此方法在POI3.8中已經被廢棄，建議使用下面一個
或者用
CellRangeAddress region1 = new CellRangeAddress(rowNumber, rowNumber, (short) 0, (short) 11);
//引數1：起始行 引數2：終止行 引數3：起始列 引數4：終止列
但應注意兩個構造方法的引數不是一樣的，具體使用哪個取決於POI的不同版本。
sheet.addMergedRegion(region1); FileOutputStream stream = new FileOutputStream("d:/student.xls"); workbook.write(stream); } } 實現之後為：
5、實際工程中，要用controller寫入介面Spring-core
/**
* 匯出憑證列表
*
*/
@PostMapping("/exportVoucher")
public void exportVoucher(@RequestBody VouQueryVO vouQueryVO) {
response.setContentType("application/vnd.ms-excel");
String fileName = "憑證列表";
try {
response.setCharacterEncoding("UTF-8");
fileName = URLEncoder.encode(fileName, "UTF-8");
response.setHeader("Content-disposition", "attachment; filename=" + fileName + ".xlsx");// 組裝附件名稱和格式
// byte[] bytes = new byte[1024];
byte[] bytes = bsVoucherService.exportVoucherList(vouQueryVO);
response.getOutputStream().write(bytes);
} catch (Exception e) {
e.printStackTrace();
}
}6、設定單元格可以用以下方法
建立sheet什麼的就不多說了，直接進入正題
HSSFCellStyle cellStyle = wb.createCellStyle();
一、設定背景色:
cellStyle.setFillForegroundColor((short) 13);// 設定背景色
cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
二、設定邊框:
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下邊框
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左邊框
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);//上邊框
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);//右邊框
三、設定居中:
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中
四、設定字型:
HSSFFont font = wb.createFont();
font.setFontName("黑體");
font.setFontHeightInPoints((short) 16);//設定字型大小
HSSFFont font2 = wb.createFont();
font2.setFontName("仿宋_GB2312");
font2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗體顯示
font2.setFontHeightInPoints((short) 12);
cellStyle.setFont(font);//選擇需要用到的字型格式
五、設定列寬:
sheet.setColumnWidth(0, 3766);
//第一個引數代表列id(從0開始),第2個引數代表寬度值 參考 ："2012-08-10"的寬度為2500
六、設定自動換行:
cellStyle.setWrapText(true);//設定自動換行
七、合併單元格:
Region region1 = new Region(0, (short) 0, 0, (short) 6);//引數1：行號 引數2：起始列號 引數3：行號 引數4：終止列號
//此方法在POI3.8中已經被廢棄，建議使用下面一個
或者用
CellRangeAddress region1 = new CellRangeAddress(rowNumber, rowNumber, (short) 0, (short) 11);
//引數1：起始行 引數2：終止行 引數3：起始列 引數4：終止列
但應注意兩個構造方法的引數不是一樣的，具體使用哪個取決於POI的不同版本。
sheet.addMergedRegion(region1); 二、讀取Excel表格
1、controller介面
@PostMapping("/inputExcel")
public String inputExcel(@RequestParam(value = "uploadFile", required = true) MultipartFile uploadFile){
return excelService.uplodeExcelService(uploadFile);
}2、service層
public String uplodeExcelService(MultipartFile uploadFile){
String msg="";
if(uploadFile==null)
return msg="上傳檔案為空";
if(uploadFile.getSize()>1024*1024*10)//單位為位元組
return msg="上傳的檔案大於10M";
// 1.xls型別的為:application/vnd.ms-excel
// 2、xlsx的型別為:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
String contentType = uploadFile.getContentType();
if(!"application/vnd.ms-excel".equals(contentType))
return msg="上傳的檔案不是已xls結尾的Excel檔案";
Workbook workbook=null;
try {
workbook=new HSSFWorkbook(uploadFile.getInputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return msg="上傳失敗1";
}
Sheet sheet = workbook.getSheetAt(0);
List<User> userList=new ArrayList<User>();
int lastRowNum = sheet.getLastRowNum();
for(int startRowNum=2;startRowNum<=lastRowNum;startRowNum++){
User user = new User();
Row row = sheet.getRow(startRowNum);
if(row==null)
continue;
short lastCellNum = row.getLastCellNum();
for(int cellNum=0;cellNum<=lastCellNum;cellNum++){
Cell cell = row.getCell(cellNum);
String value="";
if(cell!=null&&cell.getCellType()!=HSSFCell.CELL_TYPE_BLANK&&cell.getCellType()!=HSSFCell.CELL_TYPE_ERROR){
switch (cell.getCellType()) {
// 數字
case HSSFCell.CELL_TYPE_NUMERIC:// 數字
// 處理日期格式、時間格式
if(HSSFDateUtil.isCellDateFormatted(cell)){
Date date = cell.getDateCellValue();
value = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
}else{
value = NumberToTextConverter.toText(cell.getNumericCellValue());
}
break;
// 字串
case HSSFCell.CELL_TYPE_STRING:
value=cell.getStringCellValue();
// 公式
case HSSFCell.CELL_TYPE_FORMULA:
try {
DecimalFormat df = new DecimalFormat("0.00");//設定小數點的位數
value = String.valueOf(df.format(cell.getNumericCellValue()));
} catch (Exception e) {
value = String.valueOf(cell.getRichStringCellValue());
}
}
}
if(!"".equals(value)){
switch (cellNum) {
case 0:
user.setName(value);
break;
case 1:
user.setAge((int)Double.parseDouble(value));
break;
case 2:
user.setPassword(value);
break;
}
}
}
userList.add(user);
}
System.out.println(userList);
return msg="上傳成功";
}