项目总结23：POI生成Excel文件并浏览器导出

项目总结23：POI生成Excel文件并浏览器导出

具体的逻辑可以参考Controller层的注释 

 

代码1-前端html

    <button onclick="downLoad()" type="button" class="btn btn-default">导出Excelbutton>
    <script>        
        function downLoad(){
            url = basePath + "/download/data/" + 1
            window.location.href =url;
        }
    script>

 

代码3-POM文件应用POI

        <dependency>
            <groupId>org.apache.poigroupId>
            <artifactId>poiartifactId>
            <version>3.17version>
        dependency>

        <dependency>
            <groupId>org.apache.poigroupId>
            <artifactId>poi-ooxmlartifactId>
            <version>3.17version>
        dependency>

 

 

代码3-封装成完整的ExcelUtil

package com.hs.web.controller.saichang.member;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.util.CellRangeAddress;
import org.springframework.web.bind.annotation.GetMapping;

import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;

public class ExcelObject {

    private HSSFWorkbook workbook;
    private HSSFSheet sheet;


    public ExcelObject() {
        this.workbook = new HSSFWorkbook();
        this. sheet = this.workbook.createSheet("sheet1");
    }

    public ExcelObject(String sheetName) {
        this.workbook = new HSSFWorkbook();
        this. sheet = this.workbook.createSheet(sheetName);
        sheet.setDefaultRowHeight((short) (2 * 256)); //设置默认行高，表示2个字符的高度
        sheet.setDefaultColumnWidth(17);    //设置默认列宽，实际上回多出2个字符，不知道为什么
    }

    /**
     * @description:设置头标题格式
     * @param:[workbook, sheet]
     * @return:org.apache.poi.hssf.usermodel.HSSFCellStyle
     * @date:2019/5/11
     * @author:tangyj
     * @remark:
     * */
    private  HSSFCellStyle getHeadTitleStyle(){
        //设置为居中加粗
        HSSFCellStyle style = this.workbook.createCellStyle();
        HSSFFont font = this.workbook.createFont();
        font.setFontHeightInPoints((short)24);
        font.setBold(true);
        style.setAlignment( HorizontalAlignment.CENTER);
        style.setFont(font);
        style.setWrapText(true);//设置自动换行
        return style;
    }
    /**
     * @description:设置行标题格式
     * @param:[workbook, sheet]
     * @return:org.apache.poi.hssf.usermodel.HSSFCellStyle
     * @date:2019/5/11
     * @author:tangyj
     * @remark:
     * */
    private  HSSFCellStyle getRowTitleStyle(){
        //设置为居中加粗
        HSSFCellStyle style = this.workbook.createCellStyle();
        HSSFFont font = this.workbook.createFont();
        font.setFontHeightInPoints((short)12);
        font.setBold(true);
        style.setAlignment( HorizontalAlignment.CENTER);
        style.setFont(font);
        style.setWrapText(true);//设置自动换行
        return style;
    }
    /**
     * @description:设置普通单元格格式
     * @param:[workbook, sheet]
     * @return:org.apache.poi.hssf.usermodel.HSSFCellStyle
     * @date:2019/5/11
     * @author:tangyj
     * @remark:
     * */
    private  HSSFCellStyle getNormalCellTitleStyle(){
        //设置为居中加粗
        HSSFCellStyle style = this.workbook.createCellStyle();
        HSSFFont font = this.workbook.createFont();
        font.setFontHeightInPoints((short)12);
        style.setAlignment( HorizontalAlignment.CENTER);
        style.setFont(font);
        style.setWrapText(true);//设置自动换行
        return style;
    }

    /**
     * @description:1-写入头标题
     * @param:[workbook, sheet, column, headTitle]
     * @return:void
     * @date:2019/5/11
     * @author:tangyj
     * @remark:
     * */
    public  void createHeadTile(int column, String headTitle){
        //创建行(默认第一行)
        HSSFRow row = sheet.createRow(0);
        //合并单元格
        int lastColIndex = column > 0 ?  (column-1):0;
        sheet.addMergedRegion(new CellRangeAddress(0,0,0,lastColIndex));
        //单元格居中加粗格式
        HSSFCellStyle style = getHeadTitleStyle();
        //写入标题
        HSSFCell cell  = row.createCell(0);//获取当前行的第一列
        cell.setCellValue(headTitle);//写入数据
        cell.setCellStyle(style);//设置单元格格式
    }

    /**
     * @description:2-写入行标题
     * @param:[workbook, sheet, rowTitleList, firstRowIndex]
     * @return:void
     * @date:2019/5/11
     * @author:tangyj
     * @remark:
     * */
    public  void createRowTitle(List rowTitleList,int firstRowIndex){
        //创建行
        HSSFRow row = sheet.createRow(firstRowIndex);
        //设置为居中加粗
        HSSFCellStyle style = getRowTitleStyle();
        HSSFCell cell;
        for(int i=0; i< rowTitleList.size(); i++){
            cell = row.createCell(i);//获取当前列
            cell.setCellValue(rowTitleList.get(i));//写入数据
            cell.setCellStyle(style);//设置单元格格式
        }
    }
    /**
     * @description:3-写入具体的单元格数据
     * @param:[firstRowIndex, lineDataList]
     * @return:void
     * @date:2019/5/11
     * @author:tangyj
     * @remark:
     * */
    public  void createDataByRow(int firstRowIndex,List> lineDataList){
        //i代表行，j代表列
        HSSFCellStyle style = getNormalCellTitleStyle();
        for(int i=0; i< lineDataList.size(); i++){
            List lineDatas = lineDataList.get(i);
            HSSFRow row = sheet.createRow(firstRowIndex + i);//行
            for(int j=0; j){
                HSSFCell cell = row.createCell(j);//列
                cell.setCellValue(lineDatas.get(j));//写入数据
                cell.setCellStyle(style);//设置单元格格式
            }
        }
    }

    /**
     * @description:4-生成excel文件
     * @param:[filename, workbook]
     * @return:void
     * @date:2019/5/11
     * @author:tangyj
     * @remark:
     * */
    public void buildExcelFile(String filename) throws Exception{
        FileOutputStream fos = new FileOutputStream(filename);
        workbook.write(fos);
        fos.flush();
        fos.close();
    }

    /**
     * @description:5-浏览器下载excel
     * @param:[filename, workbook, response]
     * @return:void
     * @date:2019/5/11
     * @author:tangyj
     * @remark:
     * */
    public void buildExcelDocument(String filename,HttpServletResponse response) throws Exception{
        response.setContentType("application/vnd.ms-excel");
        response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode(filename, "utf-8"));
        OutputStream outputStream = response.getOutputStream();
        workbook.write(outputStream);
        outputStream.flush();
        outputStream.close();
    }


}

 

代码4-controller层

package com.hs.web.controller.saichang.member;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;

import com.hs.dao.exception.ServerSqlErrorException;
import com.hs.web.model.ResponseMessageEnum;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import java.util.*;


@Controller
@RequestMapping(value="/memberschool")
public class MemberSchoolController extends BaseWebController {
    

    /**
     * @description:导出数据
     * @param:[schoolId, response]
     * @return:void
     * @date:2019/5/11
     * @author:tangyj
     * @remark:
     * */
    @RequestMapping(value = "/download/data/{schoolId}")
    public void download(
            @PathVariable(value="schoolId",required = true)Long schoolId,
                        HttpServletResponse response) throws Exception{
        //临时生成测试数据
        String fileName = "导出excel例子.xls";
        String headTitle = "这是头标题";
        int colunmNum = 10;

        List headTitleList = new ArrayList();
        for(int i=0;i<10; i++){
            headTitleList.add("第"+(i+1)+"列标题");
        }
        List>  dataList = new ArrayList>();
        for(int i=0;i<5; i++){
            List datas = new ArrayList<>();
            for(int j=0;j<10; j++){
                datas.add("第"+(i+1)+"行第"+(j+1)+"列");
            }
            dataList.add(datas);
        }
        //1-创建一个HSSFWorkbook
        ExcelObject excel = new ExcelObject("实验数据");
        //2-写入头标题
        excel.createHeadTile(colunmNum,headTitle);//头标默认写在第一行
        //3-写入行标题
        excel.createRowTitle(headTitleList,1);
        //4-写入具体数据
        excel.createDataByRow(2,dataList);//因为没有行标题，所以从第二行开始
        //5-生成excel文件
        excel.buildExcelFile(fileName);
        //6-浏览器下载excel
        excel.buildExcelDocument(fileName,response);
    }
}

 

效果展示

 

转载于:https://www.cnblogs.com/wobuchifanqie/p/10849059.html