公共POI导出Excel方法--java

公共POI导出Excel方法–java

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.poigroupId>
            <artifactId>poiartifactId>
            <version>3.17version>
        dependency>

代码块

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  dataList = new ArrayList();

    HttpServletResponse  response;

    //构造方法,传入要导出的数据
    public ExportExcel(String title,String[] rowName,List  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
                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

                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
                    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 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 dataList = new ArrayList<>();
        Object[] objs = null;
        for(int i=0; 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):

公共POI导出Excel方法--java_第1张图片

有写的不好的地方大佬可以指点指点

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