使用poi导出Excel

最新推荐文章于 2022-06-10 16:51:29 发布

Nightliar

最新推荐文章于 2022-06-10 16:51:29 发布

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分类专栏：实用方法文章标签： poi excel

本文链接：https://blog.youkuaiyun.com/Nightliar/article/details/78569673

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6 篇文章

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1.需要导入的包，要注意jar包版本要一致

poi-3.9.jar

poi-ooxml-shemas-3.9.jar

xmlbeans-2.3.0.jar

2.工具类

package com.utils;  
  
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFCell;
import org.apache.poi.xssf.streaming.SXSSFRow;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class ExcelUtil{
	
	public static String NO_DEFINE = "no_define";//未定义的字段
    public static String DEFAULT_DATE_PATTERN="yyyy年MM月dd日";//默认日期格式
    public static int DEFAULT_COLOUMN_WIDTH = 17;
    
	public static void exportExcelX(String title,Map<String, String> headMap,JSONArray jsonArray,String datePattern,int colWidth, OutputStream out) {
        if(datePattern==null) datePattern = DEFAULT_DATE_PATTERN;
        // 声明一个工作薄
        SXSSFWorkbook workbook = new SXSSFWorkbook(1000);//缓存
        workbook.setCompressTempFiles(true);
         //表头样式
        CellStyle titleStyle = workbook.createCellStyle();
        titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        Font titleFont = workbook.createFont();
        titleFont.setFontHeightInPoints((short) 20);
        titleFont.setBoldweight((short) 700);
        titleStyle.setFont(titleFont);
        // 列头样式
        CellStyle headerStyle = workbook.createCellStyle();
        
//        headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
        headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
        headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        Font headerFont = workbook.createFont();
        headerFont.setFontHeightInPoints((short) 12);
        headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        headerStyle.setFont(headerFont);
        
        // 单元格样式
        CellStyle cellStyle = workbook.createCellStyle();
        
//        cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
        cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        Font cellFont = workbook.createFont();
        cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        cellStyle.setFont(cellFont);
        
        
        // 生成一个(带标题)表格
        SXSSFSheet sheet = (SXSSFSheet) workbook.createSheet();
        //设置列宽
        int minBytes = colWidth<DEFAULT_COLOUMN_WIDTH?DEFAULT_COLOUMN_WIDTH:colWidth;//至少字节数
        int[] arrColWidth = new int[headMap.size()];
        // 产生表格标题行,以及设置列宽
        String[] properties = new String[headMap.size()];
        String[] headers = new String[headMap.size()];
        int ii = 0;
        for (Iterator<String> iter = headMap.keySet().iterator(); iter
                .hasNext();) {
            String fieldName = iter.next();

            properties[ii] = fieldName;
            headers[ii] = headMap.get(fieldName);

            int bytes = fieldName.getBytes().length;
            arrColWidth[ii] =  bytes < minBytes ? minBytes : bytes;
            sheet.setColumnWidth(ii,arrColWidth[ii]*256);
            ii++;
        }
        // 遍历集合数据，产生数据行
        int rowIndex = 0;
        for (Object obj : jsonArray) {
            if(rowIndex == 65535 || rowIndex == 0){
                if ( rowIndex != 0 ) sheet = (SXSSFSheet) workbook.createSheet();//如果数据超过了，则在第二页显示

                SXSSFRow titleRow = (SXSSFRow) sheet.createRow(0);//表头 rowIndex=0
                titleRow.createCell(0).setCellValue(title);
                titleRow.getCell(0).setCellStyle(titleStyle);
                sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headMap.size() - 1));

                SXSSFRow headerRow = (SXSSFRow) sheet.createRow(1); //列头 rowIndex =1
                for(int i=0;i<headers.length;i++)
                {
                    headerRow.createCell(i).setCellValue(headers[i]);
                    headerRow.getCell(i).setCellStyle(headerStyle);

                }
                rowIndex = 2;//数据内容从 rowIndex=2开始
            }
            JSONObject jo = (JSONObject) JSONObject.toJSON(obj);
            SXSSFRow dataRow = (SXSSFRow) sheet.createRow(rowIndex);
            for (int i = 0; i < properties.length; i++)
            {
                SXSSFCell newCell = (SXSSFCell) dataRow.createCell(i);

                Object o =  jo.get(properties[i]);
                String cellValue = ""; 
                if(o==null) cellValue = "";
                else if(o instanceof Date) cellValue = DateUtil.format((Date)o);
                else if(o instanceof Float || o instanceof Double) 
                    cellValue= new BigDecimal(o.toString()).setScale(2,BigDecimal.ROUND_HALF_UP).toString();
                else cellValue = o.toString();

                newCell.setCellValue(cellValue);
                newCell.setCellStyle(cellStyle);
            }
            rowIndex++;
        }
        // 自动调整宽度
        /*for (int i = 0; i < headers.length; i++) {
            sheet.autoSizeColumn(i);
        }*/
        try {
            workbook.write(out);
            workbook.dispose();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    //Web 导出excel
    public static void downloadExcelFile(String title,Map<String,String> headMap,JSONArray ja,HttpServletResponse response){
        try {
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            ExcelUtil.exportExcelX(title,headMap,ja,null,0,os);
            byte[] content = os.toByteArray();
            InputStream is = new ByteArrayInputStream(content);
            // 设置response参数，可以打开下载页面
            response.reset();

            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8"); 
            response.setHeader("Content-Disposition", "attachment;filename="+DateUtil.format(new Date(), DateUtil.DATE_FOMATE_YYYYMMDDHHMMSS) + new String((title + ".xlsx").getBytes(), "iso-8859-1"));
            response.setContentLength(content.length);
            ServletOutputStream outputStream = response.getOutputStream();
            BufferedInputStream bis = new BufferedInputStream(is);
            BufferedOutputStream bos = new BufferedOutputStream(outputStream);
            byte[] buff = new byte[8192];
            int bytesRead;
            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);

            }
            bis.close();
            bos.close();
            outputStream.flush();
            outputStream.close();
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
    
   /* public static void main(String[] args) throws IOException {
        int count = 10;
        JSONArray ja = new JSONArray();
        for(int i=0;i<10;i++){
            Map<String, Object> s = new HashMap<String, Object>();
            s.put("name", "zhangsan");
            s.put("age",12);
            s.put("birthday",new Date());
            ja.add(s);
        }
        Map<String,String> headMap = new LinkedHashMap<String,String>();
        headMap.put("name","姓名");
        headMap.put("age","年龄");
        headMap.put("birthday","生日");

        String title = "测试";
        OutputStream outXlsx = new FileOutputStream("D://bb.xlsx");
        System.out.println("正在导出xlsx....");
        Date d2 = new Date();
        ExcelUtil.exportExcelX(title,headMap,ja,null,0,outXlsx);
        System.out.println("共"+count+"条数据,执行"+(new Date().getTime()-d2.getTime())+"ms");
        outXlsx.close();

    }*/
}

3.控制层的写法

    //导出对账订单列表
    @RequestMapping("partOrderExport")
    @ResponseBody
    public void partOrderExport(HttpServletRequest request, HttpServletResponse response){
    	try {
    		List<Map<String, Object>> mapList = orderEntityServiceImpl.getOrderEntityAndModeExport(tupleList);
    		if(CollectionUtils.isNotEmpty(mapList)){
    			Map<String,String> headMap = new LinkedHashMap<String,String>();
    			headMap.put("creationtime", "下单时间");
    			headMap.put("id", "订单id");
    			headMap.put("total", "交易金额（单位元）");
    			headMap.put("fee", "手续费");
    			headMap.put("poundage", "承担方");
    			headMap.put("subject", "商品名称");
    			headMap.put("month", "分期数");
    			headMap.put("username", "商户账号");
    			headMap.put("customer", "顾客姓名");
    			headMap.put("alipay", "支付宝账号");
    			headMap.put("ordertype_name", "支付类型");
    			headMap.put("status_name", "交易状态");
    			JSONArray ja = new JSONArray();
    			ja.addAll(mapList);
    			String title = "订单信息";
    			ExcelUtil.downloadExcelFile(title,headMap,ja,response);
    		}
    	} catch (Exception e) {
    		e.printStackTrace();
    	}
    }

4.页面方法

	function exportE(){
		var keyword = $("#keyword").val()
		var starttime = $("#startTime").val();
		var endtime = $("#endTime").val();
		window.open(serverWeb+"order/partExport?keyword="+keyword+"&starttime="+starttime+"&endtime="+endtime,"_blank");
	}