java POI技术之导出数据优化（15万条数据1分多钟）

专针对导出excel2007 ，用到poi3.9的jar

package com.cares.ynt.util;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import org.apache.poi.ss.usermodel.CellStyle;

import org.apache.poi.ss.usermodel.Font;

import org.apache.poi.ss.usermodel.IndexedColors;

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 org.apache.poi.xssf.usermodel.XSSFCell;

import org.apache.poi.xssf.usermodel.XSSFCellStyle;

import org.apache.poi.xssf.usermodel.XSSFDataFormat;

import org.apache.poi.xssf.usermodel.XSSFFont;

public class ExportData {

private XSSFCellStyle head_Style;

private SXSSFWorkbook workbook;

// 当前sheet

private SXSSFSheet sheet;

private SXSSFRow row = null;// 创建一行

private SXSSFCell cell = null;

private String headers[][];

private int currentRow = 0;

private XSSFCellStyle date_Style ;

private XSSFCellStyle time_Style ;

private XSSFCellStyle string_style;

private SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");

/**

* 构造函数初始化参数

* @param out

* @param title

* @param headers

* @param sheeatName

*/

public ExportData(String title,String[][] headers,String sheeatName){

this.headers = headers;

try{

workbook=new SXSSFWorkbook();

this.head_Style=(XSSFCellStyle) this.workbook.createCellStyle();

head_Style.setBorderBottom(XSSFCellStyle.BORDER_THIN);

head_Style.setBorderLeft(XSSFCellStyle.BORDER_THIN);

head_Style.setBorderRight(XSSFCellStyle.BORDER_THIN);

head_Style.setBorderTop(XSSFCellStyle.BORDER_THIN);

head_Style.setFillForegroundColor(IndexedColors.AQUA.getIndex());

head_Style.setFillPattern(CellStyle.SOLID_FOREGROUND);

head_Style.setAlignment(XSSFCellStyle.ALIGN_CENTER);

XSSFFont head_font = (XSSFFont) workbook.createFont();

head_font.setFontName("宋体");// 设置头部字体为宋体

head_font.setBoldweight(Font.BOLDWEIGHT_BOLD); // 粗体

head_font.setFontHeightInPoints((short) 11);

this.head_Style.setFont(head_font);// 单元格样式使用字体

XSSFDataFormat format = (XSSFDataFormat) workbook.createDataFormat();

XSSFFont data_font = (XSSFFont) workbook.createFont();

data_font.setFontName("宋体");// 设置头部字体为宋体

data_font.setFontHeightInPoints((short) 10);

this.date_Style = (XSSFCellStyle) this.workbook.createCellStyle();

date_Style.setBorderBottom(XSSFCellStyle.BORDER_THIN);

date_Style.setBorderLeft(XSSFCellStyle.BORDER_THIN);

date_Style.setBorderRight(XSSFCellStyle.BORDER_THIN);

date_Style.setBorderTop(XSSFCellStyle.BORDER_THIN);

date_Style.setAlignment(XSSFCellStyle.ALIGN_CENTER);

date_Style.setFont(data_font);// 单元格样式使用字体

date_Style.setDataFormat(format.getFormat("yyyy-m-d"));

this.time_Style = (XSSFCellStyle) this.workbook.createCellStyle();

time_Style.setBorderBottom(XSSFCellStyle.BORDER_THIN);

time_Style.setBorderLeft(XSSFCellStyle.BORDER_THIN);

time_Style.setBorderRight(XSSFCellStyle.BORDER_THIN);

time_Style.setBorderTop(XSSFCellStyle.BORDER_THIN);

time_Style.setAlignment(XSSFCellStyle.ALIGN_CENTER);

time_Style.setFont(data_font);// 单元格样式使用字体

time_Style.setDataFormat(format.getFormat("yyyy-m-d h:mm:s"));

this.string_style = (XSSFCellStyle) this.workbook.createCellStyle();

string_style.setBorderBottom(XSSFCellStyle.BORDER_THIN);

string_style.setBorderLeft(XSSFCellStyle.BORDER_THIN);

string_style.setBorderRight(XSSFCellStyle.BORDER_THIN);

string_style.setBorderTop(XSSFCellStyle.BORDER_THIN);

string_style.setAlignment(XSSFCellStyle.ALIGN_CENTER);

string_style.setFont(data_font);// 单元格样式使用字体

createSheet( sheeatName,headers);

}catch(Exception exc)

{

exc.printStackTrace();

}

}

/**

* 创建表头

* @param sheetName

* @param headers

*/

private  void createSheet(String sheetName,String headers[][])  {

sheet = (SXSSFSheet) workbook.createSheet(sheetName);

row = (SXSSFRow) sheet.createRow(currentRow);

for (int i = 0; i < headers.length; i++) {

cell = (SXSSFCell) row.createCell(i);

cell.setCellType(XSSFCell.CELL_TYPE_STRING);

cell.setCellValue(headers[i][0]);

cell.setCellStyle(head_Style);

}

currentRow++;

}

/**

* 导出excel

* @param listRows

* @throws ParseException

*/

public synchronized void PoiWriteExcel_To2007(List listRows,OutputStream out) throws ParseException {

for (int i = 0; i < listRows.size(); i++) {

row = (SXSSFRow) sheet.createRow(currentRow);

ArrayList ListCells = (ArrayList)listRows.get(i);

for (int j = 0; j < ListCells.size(); j++) {

Object obj = ListCells.get(j);

cell = (SXSSFCell) row.createCell(j);

if(obj instanceof Integer){

cell.setCellValue((String)obj);

cell.setCellStyle(string_style);

}else if(obj instanceof Date){

String type = headers[j][1];

if("DATE".equals(type)){

cell.setCellValue((Date)obj);

cell.setCellStyle(date_Style);

}else if("TIME".equals(type)){

cell.setCellValue((Date)obj);

cell.setCellStyle(time_Style);

}else{

if(!"".equals((String)obj))

cell.setCellValue(sdf.format((Date)obj));

cell.setCellValue("");

cell.setCellStyle(string_style);

}

}else{

if(!"".equals((String)obj))

cell.setCellValue((String)obj);

cell.setCellValue("");

cell.setCellStyle(string_style);

}

}

currentRow ++;

}

try {

workbook.write(out);

out.flush();

out.close();

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 测试导出

* @param args

* @throws IOException

* @throws ParseException

*/

public static void main(String[] args) throws IOException, ParseException {

String headers[][] = {{"日期","DATE"},{"标题","TIME"},{"其他",null}} ;

File file = new File("D://test/michael/test.xlsx");

if (file.exists())

file.delete();

file.createNewFile();

ExportData exportData = new ExportData("test", headers, "test");

ArrayList<ArrayList<?>> data = new ArrayList<ArrayList<?>>();

for (int i = 0; i < 200000; i++) {

ArrayList<Date> cellList = new ArrayList<Date>();

for (int j = 0; j < 3; j++) {

cellList.add(new Date());

}

data.add(cellList);

}

OutputStream out = new FileOutputStream(file);

exportData.PoiWriteExcel_To2007(data,out);

}

}