Java实现excel大数据量导出

其他 2020-01-24 10:33:33 阅读次数: 0

1.pom.xml配置依赖包

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.9</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
	<artifactId>poi-ooxml</artifactId>
    <version>3.9</version>
</dependency>

2.excel导出工具类

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFDataFormat;

public class ExportExcel {

   /**
	* 导出excel
	* 
	* @param response
	*            HttpServletResponse
	* @param list
	*            导出数据集合
	* @param lables           
	*            表头数组
	* @param fields
	*            key数组
	* @param title            
	*            文件名
	*/
	public static void export(HttpServletResponse response,List<Map<String, Object>> list,String[] lables,String[] fields,String title) {		   	   
	   response.setContentType("application/octet-stream");//告诉浏览器输出内容为流
	   String filename = "";
	   try {
		   filename = new String(title.getBytes("UTF-8"), "ISO_8859_1");
	   } catch (UnsupportedEncodingException e1) {
		   e1.printStackTrace();
	   }
	   response.setHeader("Content-Disposition","attachment;filename=" + filename);
	   OutputStream os = null;
	   SXSSFWorkbook sxssfWorkbook = null;
	   try {		 
	        // 获取SXSSFWorkbook
	        sxssfWorkbook = new SXSSFWorkbook();
	        Sheet sheet = sxssfWorkbook.createSheet("Sheet1");
	        // 冻结第一行
	        sheet.createFreezePane(0, 1);	
	        // 创建第一行,作为header表头
	        Row header = sheet.createRow(0);
	        // 循环创建header单元格
	        for (int cellnum = 0; cellnum < lables.length; cellnum++) {
	            Cell cell = header.createCell(cellnum);
	            //cell.setCellStyle(getAndSetXSSFCellStyleHeader(sxssfWorkbook));//设置表头单元格样式,根据需要设置
	            cell.setCellValue(lables[cellnum]);
	            //设置每列固定宽度
	            sheet.setColumnWidth(cellnum, 20 * 256);
	        }
	        // 遍历创建行,导出数据
	        for (int rownum = 1; rownum <= list.size(); rownum++) {
	            Row row = sheet.createRow(rownum);
	            Map<String, Object> map = list.get(rownum-1);
	            // 循环创建单元格
	            for (int cellnum = 0; cellnum < fields.length; cellnum++) {
	                Cell cell = row.createCell(cellnum);
	                //cell.setCellStyle(getAndSetXSSFCellStyleOne(sxssfWorkbook));//设置数据行单元格样式,根据需要设置
	                cell.setCellValue(map.get(fields[cellnum]) == null ? "" : map.get(fields[cellnum]).toString());
	            }
	        }
	        //自定义各列宽度
	        //setSheet(sheet);
	        os = response.getOutputStream(); 
	        sxssfWorkbook.write(os);
	    } catch (Exception e) {
	    	e.printStackTrace();
	    } finally {
	        try {
	            if(sxssfWorkbook != null) {
	                //处理SXSSFWorkbook导出excel时，产生的临时文件
	                sxssfWorkbook.dispose();
	            }
	            if(os != null) {
	            	os.close();
	            }
	        } catch (IOException e) {
	            e.printStackTrace();
	        }
	    }
	}

   /**
	* 导出excel带标题
	* 
	* @param response
	*            HttpServletResponse
	* @param list
	*            导出数据集合
	* @param lables           
	*            表头数组
	* @param fields
	*            key数组
	* @param title            
	*            文件名
	* @param headTitle            
	*            文件标题
	*/
	public static void titleExport(HttpServletResponse response,List<Map<String, Object>> list,String[] lables,String[] fields,String title,String headTitle) {		   	   
	   response.setContentType("application/octet-stream");//告诉浏览器输出内容为流
	   String filename = "";
	   try {
		   filename = new String(title.getBytes("UTF-8"), "ISO_8859_1");
	   } catch (UnsupportedEncodingException e1) {
		   e1.printStackTrace();
	   }
	   response.setHeader("Content-Disposition","attachment;filename=" + filename);
	   OutputStream os = null;
	   SXSSFWorkbook sxssfWorkbook = null;
	   try {		 
	        // 获取SXSSFWorkbook
	        sxssfWorkbook = new SXSSFWorkbook();
	        Sheet sheet = sxssfWorkbook.createSheet("Sheet1");
	        // 创建第一行,作为标题
	        Row headline = sheet.createRow(0);
	        Cell c = headline.createCell(0);
	        //设置居中
	        XSSFCellStyle xssfCellStyle = (XSSFCellStyle) sxssfWorkbook.createCellStyle();
	        xssfCellStyle.setAlignment(HorizontalAlignment.CENTER);
	        c.setCellStyle(xssfCellStyle);
	        c.setCellValue(headTitle);
	        sheet.addMergedRegion(new CellRangeAddress(0,0,0,lables.length-1));//合并单元格(起始行号,终止行号,起始列号,终止列号)
	        // 冻结第二行
	        sheet.createFreezePane(0, 2);	
	        // 创建第二行,作为header表头
	        Row header = sheet.createRow(1);
	        // 循环创建header单元格
	        for (int cellnum = 0; cellnum < lables.length; cellnum++) {
	            Cell cell = header.createCell(cellnum);
	            //cell.setCellStyle(getAndSetXSSFCellStyleHeader(sxssfWorkbook));//设置表头单元格样式,根据需要设置
	            cell.setCellValue(lables[cellnum]);
	            //设置每列固定宽度
	            sheet.setColumnWidth(cellnum, 10 * 256);
	        }
	        // 遍历创建行,导出数据
	        for (int rownum = 1; rownum <= list.size(); rownum++) {
	            Row row = sheet.createRow(rownum+1);
	            Map<String, Object> map = list.get(rownum-1);
	            // 循环创建单元格
	            for (int cellnum = 0; cellnum < fields.length; cellnum++) {
	                Cell cell = row.createCell(cellnum);
	                //cell.setCellStyle(getAndSetXSSFCellStyleOne(sxssfWorkbook));//设置数据行单元格样式,根据需要设置
	                cell.setCellValue(map.get(fields[cellnum]) == null ? "" : map.get(fields[cellnum]).toString());
	            }
	        }
	        //自定义各列宽度
	        //setSheet(sheet);
	        os = response.getOutputStream(); 
	        sxssfWorkbook.write(os);
	    } catch (Exception e) {
	    	e.printStackTrace();
	    } finally {
	        try {
	            if(sxssfWorkbook != null) {
	                //处理SXSSFWorkbook导出excel时，产生的临时文件
	                sxssfWorkbook.dispose();
	            }
	            if(os != null) {
	            	os.close();
	            }
	        } catch (IOException e) {
	            e.printStackTrace();
	        }
	    }
	}

   /**
	* 导出excel(多个工作薄)
	* 
	* @param response
	*            HttpServletResponse
	* @param datas
	*            导出数据集合
	* @param title            
	*            文件名
	*/
	public static void exportSheets(HttpServletResponse response,List<Map<String, Object>> datas,String title) {		   	   
	   response.setContentType("application/octet-stream");//告诉浏览器输出内容为流
	   String filename = "";
	   try {
		   filename = new String(title.getBytes("UTF-8"), "ISO_8859_1");
	   } catch (UnsupportedEncodingException e1) {
		   e1.printStackTrace();
	   }
	   response.setHeader("Content-Disposition","attachment;filename=" + filename);
	   OutputStream os = null;
	   SXSSFWorkbook sxssfWorkbook = null;
	   try {		 
	        // 获取SXSSFWorkbook
	        sxssfWorkbook = new SXSSFWorkbook();
	        // 根据集合的数量创建sheet
	        for(int i=0; i<datas.size(); i++){
	            Sheet sheet = sxssfWorkbook.createSheet("Sheet"+(i+1));
		    // 冻结第一行
		    sheet.createFreezePane(0, 1);	
		    // 创建第一行,作为header表头
		    Row header = sheet.createRow(0);
		    // 循环创建header单元格
		    String[] lables = (String[]) datas.get(i).get("lables");
		    String[] fields = (String[]) datas.get(i).get("fields");
		    for (int cellnum = 0; cellnum < lables.length; cellnum++) {
		        Cell cell = header.createCell(cellnum);
		        //cell.setCellStyle(getAndSetXSSFCellStyleHeader(sxssfWorkbook));//设置表头单元格样式,根据需要设置
		        cell.setCellValue(lables[cellnum]);
		        //设置每列固定宽度
		        sheet.setColumnWidth(cellnum, 20 * 256);
		    }
		    // 遍历创建行,导出数据
		    List<Map<String, Object>> list = (List<Map<String, Object>>) datas.get(i).get("list");
		    for (int rownum = 1; rownum <= list.size(); rownum++) {
		        Row row = sheet.createRow(rownum);
		        Map<String, Object> map = list.get(rownum-1);
		        // 循环创建单元格
		        for (int cellnum = 0; cellnum < fields.length; cellnum++) {
		            Cell cell = row.createCell(cellnum);
		            //cell.setCellStyle(getAndSetXSSFCellStyleOne(sxssfWorkbook));//设置数据行单元格样式,根据需要设置
		            cell.setCellValue(map.get(fields[cellnum]) == null ? "" : map.get(fields[cellnum]).toString());
		        }
		    }
	        }
	        os = response.getOutputStream(); 
	        sxssfWorkbook.write(os);
	    } catch (Exception e) {
	    	e.printStackTrace();
	    } finally {
	        try {
	            if(sxssfWorkbook != null) {
	                //处理SXSSFWorkbook导出excel时，产生的临时文件
	                sxssfWorkbook.dispose();
	            }
	            if(os != null) {
	            	os.close();
	            }
	        } catch (IOException e) {
	            e.printStackTrace();
	        }
	    }
	}
	   
   /**
    * 自定义各列宽度(单位为:字符宽度的1/256)
    */
    private static void setSheet(Sheet sheet) {       
	sheet.setColumnWidth(0, 32 * 256);
        sheet.setColumnWidth(1, 32 * 256);
        sheet.setColumnWidth(2, 20 * 256);
        sheet.setColumnWidth(3, 20 * 256);
        sheet.setColumnWidth(4, 20 * 256);
        sheet.setColumnWidth(5, 20 * 256);
        sheet.setColumnWidth(6, 20 * 256);
        sheet.setColumnWidth(7, 20 * 256);
        sheet.setColumnWidth(8, 20 * 256);
        sheet.setColumnWidth(9, 20 * 256);
        sheet.setColumnWidth(10, 32 * 256);
    }
 
   /**
    * 获取并设置header样式
    */
    private static XSSFCellStyle getAndSetXSSFCellStyleHeader(SXSSFWorkbook sxssfWorkbook) {
        XSSFCellStyle xssfCellStyle = (XSSFCellStyle) sxssfWorkbook.createCellStyle();
        Font font = sxssfWorkbook.createFont();
        // 字体大小
        font.setFontHeightInPoints((short) 14);
        // 字体粗细
        font.setBoldweight((short) 20);
        // 将字体应用到样式上面
        xssfCellStyle.setFont(font);
        // 是否自动换行
        xssfCellStyle.setWrapText(false);
        // 水平居中
        xssfCellStyle.setAlignment(HorizontalAlignment.CENTER);
        // 垂直居中
        xssfCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        return xssfCellStyle;
    }
 
   /**
    * 获取并设置样式
    */
    private static XSSFCellStyle getAndSetXSSFCellStyleOne(SXSSFWorkbook sxssfWorkbook) {
        XSSFCellStyle xssfCellStyle = (XSSFCellStyle) sxssfWorkbook.createCellStyle();
        XSSFDataFormat format = (XSSFDataFormat)sxssfWorkbook.createDataFormat();
        // 是否自动换行
        xssfCellStyle.setWrapText(false);
        // 水平居中
        xssfCellStyle.setAlignment(HorizontalAlignment.CENTER);
        // 垂直居中
        xssfCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        // 前景颜色
        xssfCellStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
        xssfCellStyle.setFillForegroundColor(IndexedColors.AQUA.getIndex());
        // 边框
        xssfCellStyle.setBorderBottom(BorderStyle.THIN);
        xssfCellStyle.setBorderRight(BorderStyle.THIN);
        xssfCellStyle.setBorderTop(BorderStyle.THIN);
        xssfCellStyle.setBorderLeft(BorderStyle.THIN);
        xssfCellStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
        xssfCellStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
        xssfCellStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());
        xssfCellStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
        // 防止数字过长,excel导出后,显示为科学计数法,如:防止8615192053888被显示为8.61519E+12
        xssfCellStyle.setDataFormat(format.getFormat("0"));
        return xssfCellStyle;
    }
}

3.业务层调用

//导出
@RequestMapping("/export")
public String export(Model model,HttpServletRequest request,HttpServletResponse response) {
	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	System.out.println("导出开始时间："+format.format(new Date()));
	List<Map<String, Object>> list = jkconfigDao.exportByRksj();//查询业务数据
	String[] lables = new String[]{"号码","入库时间"};//表头数组
	String[] fields = new String[]{"HM","RKSJ"};//查询数据对应的属性数组
	String title = "测试.xlsx";
	ExportExcel.export(response, list, lables, fields, title);	
	System.out.println("导出结束时间："+format.format(new Date()));
	return null;
}
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