Apache POI导出excel表格

时间 2020-07-07

原文原文链接

项目中咱们常常用到导出功能，将数据导出以便于审查和统计等。本文主要使用Apache POI实现导出数据。前端

POI中文文档

简介

ApachePOI是Apache软件基金会的开放源码函式库，POI提供API给java程序对Microsoft Office格式档案读和写的功能。java

HSSF概况apache

HSSF是Horrible SpreadSheet Format的缩写，经过HSSF，你能够用纯java代码来读取、写入、修改Excel文件。HSSF为读取操做提供了两类API：usermodel和eventusermodel，既”用户模型“和”事件-用户模型“。数组

POI Excel 文档结构类浏览器

 1  HSSFWorkbook excel文档对象  2  HSSFSheet excel的sheet  3  HSSFRow excel的行  4  HSSFCell excel的单元格  5  HSSFFont excel字体  6  HSSFName 名称  7  HSSFDataFormat 日期格式  8  HSSFHeader sheet头  9  HSSFFooter sheet尾 10  HSSFCellStyle cell样式 11  HSSFDateUtil 日期 12  HSSFPrintSetup 打印 13     HSSFErrorConstants 错误信息表

EXCEL经常使用操做方法

获得Excel经常使用对象

 1     POIFSFileSystem fs=newPOIFSFileSystem(new  FileInputStream("d:/test.xls"));  2     //获得Excel工做簿对象 
 3     HSSFWorkbook wb = new HSSFWorkbook(fs);  4     //获得Excel工做表对象 
 5     HSSFSheet sheet = wb.getSheetAt(0);  6     //获得Excel工做表的行 
 7     HSSFRow row = sheet.getRow(i);  8     //获得Excel工做表指定行的单元格 
 9     HSSFCell cell = row.getCell((short) j); 10     cellStyle = cell.getCellStyle();//获得单元格样式

创建Excel经常使用对象

1 HSSFWorkbook wb = new HSSFWorkbook();//建立Excel工做簿对象 
2 HSSFSheet sheet = wb.createSheet("new sheet");//建立Excel工做表对象 
3 HSSFRow row = sheet.createRow((short)0); //建立Excel工做表的行 
4 cellStyle = wb.createCellStyle();//建立单元格样式 
5 row.createCell((short)0).setCellStyle(cellStyle); //建立Excel工做表指定行的单元格 
6 row.createCell((short)0).setCellValue(1); //设置Excel工做表的值

设置表格

 1     //设置sheet名称和单元格内容 
 2     wb.setSheetName(1, "第一张工做表",HSSFCell.ENCODING_UTF_16);  3     cell.setEncoding((short) 1);  4     cell.setCellValue("单元格内容");  5       
 6     //取得sheet的数目 
 7  wb.getNumberOfSheets()  8       
 9     //根据index取得sheet对象 
10     HSSFSheet sheet = wb.getSheetAt(0); 11       
12     //取得有效的行数 
13     int rowcount = sheet.getLastRowNum(); 14       
15     //取得一行的有效单元格个数 
16  row.getLastCellNum(); 17       
18     //单元格值类型读写 
19     cell.setCellType(HSSFCell.CELL_TYPE_STRING); //设置单元格为STRING类型 
20     cell.getNumericCellValue();//读取为数值类型的单元格内容 21       
22     //设置列宽、行高 
23     sheet.setColumnWidth((short)column,(short)width); 24     row.setHeight((short)height); 25       
26     //添加区域，合并单元格 
27     Region region = new Region((short)rowFrom,(short)columnFrom,(short)rowTo,(short)columnTo);//合并从第rowFrom行columnFrom列 
28     sheet.addMergedRegion(region);// 到rowTo行columnTo的区域 29     //获得全部区域 
30  sheet.getNumMergedRegions() 31       
32     //保存Excel文件 
33     FileOutputStream fileOut = new FileOutputStream(path); 34     wb.write(fileOut);

开始实现

pom.xml

 1     <dependency>  
 2        <groupId>org.apache.poi</groupId>  
 3        <artifactId>poi</artifactId>  
 4        <version>${poi.version</version>  
 5     </dependency>  
 6       
 7     <dependency>  
 8        <groupId>org.apache.poi</groupId>  
 9        <artifactId>poiscratchpad</artifactId>  
10        <version>${poi.version</version>  
11     </dependency>  
12       
13     <dependency>  
14         <groupId>org.apache.poi</groupId>  
15         <artifactId>poiooxml</artifactId>  
16         <version>${poi.version</version>  
17     </dependency>

excel导出工具类

 1     public class ExcelExport {  2         //表头 
 3         private String title;  4         //各个列的表头 
 5         private String[] heardList;  6         //各个列的元素key值 
 7         private String[] heardKey;  8         //须要填充的数据信息 
 9         private List<Map> data;  10         //字体大小 
 11         private int fontSize = 14;  12         //行高 
 13         private int rowHeight = 30;  14         //列宽 
 15         private int columWidth = 200;  16         //工做表 
 17         private String sheetName = "sheet1";  18       
 19         public String getTitle() {  20             return title;  21  }  22       
 23         public ExcelExport setTitle(String title) {  24             this.title = title;  25             return this;  26  }  27       
 28         public String[] getHeardList() {  29             return heardList;  30  }  31       
 32         public ExcelExport setHeardList(String[] heardList) {  33             this.heardList = heardList;  34             return this;  35  }  36       
 37         public String[] getHeardKey() {  38             return heardKey;  39  }  40       
 41         public ExcelExport setHeardKey(String[] heardKey) {  42             this.heardKey = heardKey;  43             return this;  44  }  45       
 46         public List<Map> getData() {  47             return data;  48  }  49       
 50         public ExcelExport setData(List<Map> data) {  51             this.data = data;  52             return this;  53  }  54       
 55         public int getFontSize() {  56             return fontSize;  57  }  58       
 59         public ExcelExport setFontSize(int fontSize) {  60             this.fontSize = fontSize;  61             return this;  62  }  63       
 64         public int getRowHeight() {  65             return rowHeight;  66  }  67       
 68         public ExcelExport setRowHeight(int rowHeight) {  69             this.rowHeight = rowHeight;  70             return this;  71  }  72       
 73         public int getColumWidth() {  74             return columWidth;  75  }  76       
 77         public ExcelExport setColumWidth(int columWidth) {  78             this.columWidth = columWidth;  79             return this;  80  }  81       
 82         public String getSheetName() {  83             return sheetName;  84  }  85       
 86         public ExcelExport setSheetName(String sheetName) {  87             this.sheetName = sheetName;  88             return this;  89  }  90       
 91     /** 
 92  * 开始导出数据信息  93  *  94  * @throws ExcelException 抛出数据异常类  95      */  
 96     public byte[] exportExport(HttpServletRequest request, HttpServletResponse response) throws ExcelException {  97         //检查参数配置信息 
 98  checkConfig();  99         //建立工做簿 
100         HSSFWorkbook wb = new HSSFWorkbook(); 101         //建立工做表 
102         HSSFSheet wbSheet = wb.createSheet(this.sheetName); 103         //在第0行建立rows 
104         HSSFRow row = wbSheet.createRow((int) 0); 105         //建立单元格，设置表头，表头居中 
106         HSSFCellStyle style = wb.createCellStyle(); 107         //设置单元格样式 
108  style.setAlignment(HSSFCellStyle.ALIGN_CENTER); 109  style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); 110         HSSFFont font = wb.createFont(); 111         font.setFontHeightInPoints((short) this.fontSize); 112       
113         //设置列头元素 
114         HSSFCell cellHead = null; 115         for (int i = 0; i < heardList.length; i++) { 116             cellHead = row.createCell(i); 117  cellHead.setCellValue(heardList[i]); 118  cellHead.setCellStyle(style); 119  } 120       
121         //开始写入实体数据信息 
122  style.setFont(font); 123         for (int i = 0; i < data.size(); i++) { 124             HSSFRow roww = wbSheet.createRow((int) i + 1); 125             Map map = data.get(i); 126             HSSFCell cell = null; 127             for (int j = 0; j < heardKey.length; j++) { 128                 cell = roww.createCell(j); 129  cell.setCellStyle(style); 130                 Object valueObject = map.get(heardKey[j]); 131                 String value = null; 132                 if (valueObject == null) { 133                     valueObject = ""; 134  } 135                 if (valueObject instanceof String) { 136                     //取出的数据是字符串直接赋值 
137                     value = (String) map.get(heardKey[j]); 138                 } else if (valueObject instanceof Integer) { 139                     //取出的数据是Integer 
140                     value = String.valueOf(((Integer) (valueObject)).floatValue()); 141                 } else if (valueObject instanceof BigDecimal) { 142                     //取出的数据是BigDecimal 
143                     value = String.valueOf(((BigDecimal) (valueObject)).floatValue()); 144                 } else { 145                     value = valueObject.toString(); 146  } 147                 cell.setCellValue(Strings.isNullOrEmpty(value) ? "" : value); 148  } 149  } 150             //设置行高 151             //设置行高的过程须要注意的一不包含标题 
152             for (int i = 0; i < data.size() + 1; i++) { 153                 HSSFRow hssfRow = wbSheet.getRow(i); 154                 hssfRow.setHeightInPoints(this.rowHeight); 155  } 156             //设置列宽 
157             if (data.size() > 0) { 158                 for (int i = 0; i < data.get(0).size(); i++) { 159                     wbSheet.setColumnWidth(i, MSExcelUtils.pixel2WidthUnits(this.columWidth)); 160  } 161             } else { 162                 for (int i = 0; i < heardList.length; i++) { 163                     wbSheet.setColumnWidth(i, MSExcelUtils.pixel2WidthUnits(this.columWidth)); 164  } 165  } 166             //导出数据 
167             try { 168                 //设置Http响应头告诉浏览器下载这个附件 
169                 response.setHeader("Content-Disposition", "attachment;Filename=" + System.currentTimeMillis() + ".xls"); 170                 OutputStream outputStream = response.getOutputStream(); 171  wb.write(outputStream); 172  outputStream.close(); 173                 return wb.getBytes(); 174             } catch (Exception ex) { 175  ex.printStackTrace(); 176                 throw new ExcelException("导出Excel出现严重异常，异常信息：" + ex.getMessage()); 177  } 178       
179  } 180       
181         /** 
182  * 检查数据配置问题 183  * 184  * @throws ExcelException 抛出数据异常类 185          */  
186         protected void checkConfig() throws ExcelException { 187             if (heardKey == null || heardList.length == 0) { 188                 throw new ExcelException("列名数组不能为空或者为NULL"); 189  } 190       
191             if (fontSize < 0 || rowHeight < 0 || columWidth < 0) { 192                 throw new ExcelException("字体、宽度或者高度不能为负值"); 193  } 194       
195             if (Strings.isNullOrEmpty(sheetName)) { 196                 throw new ExcelException("工做表表名不能为NULL"); 197  } 198  } 199     }

Service层

 1     /** 
 2  * 导出分类销售统计  3  *  4  * @param request  5  * @param response  6  * @param startDate 开始日期  7  * @param endDate 结束日期  8  * @param searchKey 关键字  9  * @param storeId 店铺id 10  * @param organId 组织id 11  * @return 
12      */  
13     public byte[] exportSaleCategory(HttpServletRequest request, HttpServletResponse response, String startDate,String endDate, String searchKey, String storeId, String organId) { 14         Integer count = augeSaleMapper.countShowCategoryStatistics(storeId, organId, startDate, endDate, searchKey); 15         List<Map> maps = augeSaleMapper.selectShowCategoryStatistics(storeId, organId, startDate, endDate,searchKey, 0, count); 16         String[] rowsName = new String[]{"商品分类", "销售数量", "销售金额", "毛利额", "毛利率"}; 17         String[] parames = new String[]{"name", "saleCount", "itemSumPrice", "grossProfit", "grossProfitMargin"}; 18         //建立导出工具类 
19         ExcelExport excelExport = new ExcelExport(); 20  excelExport.setHeardKey(parames).setData(maps).setHeardList(rowsName); 21         byte[] bytes = excelExport.exportExport(request, response); 22         return bytes; 23     }

Controller层

 1     @RequestMapping(value = "/exportSaleCategory", method = RequestMethod.GET)  2     public ResponseEntity<byte[]> exportSaleCategory(HttpServletRequest request, HttpServletResponse response, String startDate, String endDate, String searchKey, String storeId) throws Exception {  3         AugeAdmin admin = (AugeAdmin) session.getAttribute("admin");  4         HttpHeaders headers = new HttpHeaders();  5  headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);  6         String fileName = new String(("品类销售统计.xls").getBytes("UTF-8"), "iso-8859-1");  7         headers.setContentDispositionFormData("attachment", fileName);  8         byte[] bytes = saleService.exportSaleCategory(request, response, Strings.emptyToNull(startDate),  9  Strings.emptyToNull(endDate), Strings.emptyToNull(searchKey), Strings.emptyToNull(storeId), admin.getOrganId()); 10         return new ResponseEntity<byte[]>(bytes, headers, HttpStatus.CREATED); 11     }

前端页面

1     $("#exportBtn").on('click', function () { 2          var startDate = $('#startDate').val(); 3          var endDate = $('#endDate').val(); 4          var storeId = $("#storeId").val(); 5          var url = "${basePath}/sale/exportSaleCategory?startDate=" + startDate + "&endDate=" +endDate + "&storeId=" + storeId; 6         window.location.href = url; 7     });