最近做了一些数据Excel导出的功能,先是看了很多博客,然后发现都没有公用的方法,但是又发现好像每一次导出都需要写一些差不多类似的代码,后来找到一篇公共导出Excel的方法,https://www.cnblogs.com/coprince/p/5757714.html,但是这位博主好像并没有完全公布出来,然后自己稍微研究了一下在他的源码基础上写了个公共的导出方法。有写的不好的地方大佬可以指点指点
maven依赖
<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.17</version> </dependency>
package com.tl.util; import java.io.IOException; import java.io.OutputStream; import java.net.URLEncoder; 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.ss.usermodel.BorderStyle; import org.apache.poi.ss.usermodel.CellType; import org.apache.poi.ss.usermodel.HorizontalAlignment; import org.apache.poi.ss.usermodel.VerticalAlignment; import org.apache.poi.ss.util.CellRangeAddress; public class ExportExcel { //显示的导出表的标题 private String title; //导出表的列名 private String[] rowName ; private List<Object[]> dataList = new ArrayList<Object[]>(); HttpServletResponse response; //构造方法,传入要导出的数据 public ExportExcel(String title,String[] rowName,List<Object[]> dataList){ this.dataList = dataList; this.rowName = rowName; this.title = title; } /* * 导出数据 * */ public void export(HttpServletResponse response) throws Exception{ try{ HSSFWorkbook workbook = new HSSFWorkbook(); // 创建工作簿对象 HSSFSheet sheet = workbook.createSheet(title); // 创建工作表 // 产生表格标题行 HSSFRow rowm = sheet.createRow(0); HSSFCell cellTiltle = rowm.createCell(0); //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面 - 可扩展】 HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象 HSSFCellStyle style = this.getStyle(workbook); //单元格样式对象 sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1))); cellTiltle.setCellStyle(columnTopStyle); cellTiltle.setCellValue(title); // 定义所需列数 int columnNum = rowName.length; HSSFRow rowRowName = sheet.createRow(2); // 在索引2的位置创建行(最顶端的行开始的第二行) // 将列头设置到sheet的单元格中 for(int n=0;n<columnNum;n++){ HSSFCell cellRowName = rowRowName.createCell(n); //创建列头对应个数的单元格 cellRowName.setCellValue(CellType.STRING.getCode()); //设置列头单元格的数据类型 HSSFRichTextString text = new HSSFRichTextString(rowName[n]); cellRowName.setCellValue(text); //设置列头单元格的值 cellRowName.setCellStyle(columnTopStyle); //设置列头单元格样式 } //将查询出的数据设置到sheet对应的单元格中 for(int i=0;i<dataList.size();i++){ Object[] obj = dataList.get(i);//遍历每个对象 HSSFRow row = sheet.createRow(i+3);//创建所需的行数 for(int j=0; j<obj.length; j++){ HSSFCell cell = null; //设置单元格的数据类型 if(j == 0){ cell = row.createCell(j,CellType.NUMERIC); cell.setCellValue(i+1); }else{ cell = row.createCell(j,CellType.STRING); //if(!"".equals(obj[j]) && obj[j] != null){ cell.setCellValue(obj[j].toString()); //设置单元格的值 // } } cell.setCellStyle(style); //设置单元格样式 } } //让列宽随着导出的列长自动适应 for (int colNum = 0; colNum < columnNum; colNum++) { int columnWidth = sheet.getColumnWidth(colNum) / 256; for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) { HSSFRow currentRow; //当前行未被使用过 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.getCellTypeEnum() == CellType.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 = title+".xls"; fileName = URLEncoder.encode(fileName, "UTF-8");//中文名称 String headStr = "attachment; filename=\"" + fileName + "\""; 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(); } } /* * 列头单元格样式 */ public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); //设置字体大小 font.setFontHeightInPoints((short)12); //字体加粗 font.setBold(true); //设置字体名字 font.setFontName("Courier New"); //设置样式; HSSFCellStyle style = workbook.createCellStyle(); //设置底边框; style.setBorderBottom(BorderStyle.THIN); //设置底边框颜色; style.setBottomBorderColor((short)8);//HSSFColor.BLACK.index(过时,替换成(short)8)下面都一样 //设置左边框; style.setBorderLeft(BorderStyle.THIN); //设置左边框颜色; style.setLeftBorderColor((short)8); //设置右边框; style.setBorderRight(BorderStyle.THIN); //设置右边框颜色; style.setRightBorderColor((short)8); //设置顶边框; style.setBorderTop(BorderStyle.THIN); //设置顶边框颜色; style.setTopBorderColor((short)8); //在样式用应用设置的字体; style.setFont(font); //设置自动换行; style.setWrapText(false); //设置水平对齐的样式为居中对齐; style.setAlignment(HorizontalAlignment.CENTER); //设置垂直对齐的样式为居中对齐; style.setVerticalAlignment(VerticalAlignment.CENTER); return style; } /* * 列数据信息单元格样式 */ public HSSFCellStyle getStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); //设置字体大小 font.setFontHeightInPoints((short)11); //字体加粗 //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //设置字体名字 font.setFontName("Courier New"); //设置样式; HSSFCellStyle style = workbook.createCellStyle(); //设置底边框; style.setBorderBottom(BorderStyle.THIN); //设置底边框颜色; style.setBottomBorderColor((short)8);//HSSFColor.BLACK.index(过时,替换成(short)8) //设置左边框; style.setBorderLeft(BorderStyle.THIN); //设置左边框颜色; style.setLeftBorderColor((short)8);//HSSFColor.BLACK.index(过时,替换成(short)8) //设置右边框; style.setBorderRight(BorderStyle.THIN); //设置右边框颜色; style.setRightBorderColor((short)8); //设置顶边框; style.setBorderTop(BorderStyle.THIN); //设置顶边框颜色; style.setTopBorderColor((short)8); //在样式用应用设置的字体; style.setFont(font); //设置自动换行; style.setWrapText(false); //设置水平对齐的样式为居中对齐; style.setAlignment(HorizontalAlignment.CENTER); //设置垂直对齐的样式为居中对齐; style.setVerticalAlignment(VerticalAlignment.CENTER); return style; } }
这个导出用到的方法,组装数据的如下:
@RequestMapping("/outPartitionExcel") public void outPartitionExcel(Partition partition,HttpServletResponse response) throws Exception { List<Partition> Partitions = partitionService.findAllPartitionPage(partition); String title = "管理分区"; String[] rowsName = new String[] {"序号","分拣编码","定区编码","省份","城市","区(县)","关键字","起始号","终止号","单双号","操作人员","操作单位","操作时间"}; List<Object[]> dataList = new ArrayList<>(); Object[] objs = null; for(int i=0; i<Partitions.size();i++) { Partition main = Partitions.get(i); objs = new Object[rowsName.length]; objs[0] = i; objs[1] = main.getSortingCode(); objs[2] = main.getZoneCode(); objs[3] = main.getProvince(); objs[4] = main.getCity(); objs[5] = main.getCounty(); objs[6] = main.getKeyword(); objs[7] = main.getStartNumber(); objs[8] = main.getTerminateNumber(); objs[9] = main.getsDNumber(); objs[10] = main.getEmp().getEmpName(); objs[11] = main.getSyUnits().getName(); SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String date = df.format(main.getOperationTime()); objs[12] = date; dataList.add(objs); } ExportExcel ex = new ExportExcel(title, rowsName, dataList); ex.export(response); }
是通过组装一个List的类型(里面是一些列的导出数据,可以为String/int/long等全部数据类型)。数组rowsName是指导出数据的栏位名称,title是指导出excel的标题
和sheet名。
以以上的数据为例,导出的结果显示如下(只是做了简单的处理,有一些合并行与excel的样式问题没有涉及)