java100万数据量导出测试1

Myth丶恋晨 2022-10-27 02:18 124阅读 0赞

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package com.hisense.cis.test;
    
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.HashMap;
    import java.util.HashSet;
    import java.util.List;
    import java.util.AbstractMap;
    import java.util.Map;
    import java.util.Set;
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.sql.Timestamp;
    import java.util.Date;
    
    import javax.swing.JFileChooser;
    
    
    
    import org.apache.poi.hssf.usermodel.HSSFCellStyle;
    import org.apache.poi.hssf.usermodel.HSSFFont;
    import org.apache.poi.hssf.util.CellRangeAddress;
    import org.apache.poi.hssf.util.HSSFColor;
    import org.apache.poi.ss.usermodel.CellStyle;
    import org.apache.poi.ss.usermodel.Font;
    import org.apache.poi.ss.usermodel.Row;
    import org.apache.poi.ss.usermodel.Sheet;
    import org.apache.poi.xssf.streaming.SXSSFWorkbook;
    
    // 杨少平测试
    //yangyifan-20210203
    
    public class Test2 {
    
        public static void main(String []args) {
            getExcelExport();
        }
        public static void getExcelExport() {
    
            Timestamp nowTimestamp = new Timestamp(new Date().getTime());
            System.err.println("-----------------------------2007 100W导数开始时间：------------------------\n" + nowTimestamp);
    
    
            SXSSFWorkbook workBook = new SXSSFWorkbook();
            //创建HSSFWorkbook对象(excel的文档对象)   POI要操作excel 2007及以上的版本需要使用XSSF来代替上面代码的HSSF。
            //XSSFWorkbook workBook = new XSSFWorkbook();
            //建立新的sheet对象（excel的表单）
            Sheet sheet = workBook.createSheet("Excel 2007导出");       //创建Excel工作表（页签）
            int[] width = {5000,5000,5000,5000,5000,5000,5000,5000};        for(int i=0; i < width.length; i++){
                sheet.setColumnWidth(i, width [i]);                       //设置列宽
            }
            //excel列
            String[] head = {"列1", "列2", "列3", "列4", "列5", "列6", "列7", "列8"};        Row title = sheet.createRow(0);                            //创建标题行
            title.createCell(0).setCellValue("Excel 2007导出测试");        //给标题行单元格赋值
            //合并单元格          构造参数依次为起始行，截至行，起始列， 截至列
            //sheet.addMergedRegion(new CellRangeAddress(0,0,0,7));
            getTitleStyle(workBook, title);                   //创建并初始化标题样式
            InitExcelHead(workBook, sheet, head);             //初始化抬头和样式
            setExcelValue(workBook, sheet, head);           //excel内容赋值
            excelExport(workBook);                            //导出处理
    
    
            Timestamp nowTimestamp1 = new Timestamp(new Date().getTime());        System.err.println("-----------------------------2007 100W导数结束时间：------------------------\n" + nowTimestamp1);
    
    
        }
        public static void getTitleStyle(SXSSFWorkbook workbook, Row title) {
    
            CellStyle style = workbook.createCellStyle();              // 创建样式
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER);            // 字体居中
            style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); // 垂直居中
            Font font = workbook.createFont();                         // 创建字体样式
            font.setFontName("宋体");                                   // 字体
            font.setFontHeightInPoints((short) 16);                    // 字体大小
            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);              // 加粗
            style.setFont(font);                         //给样式指定字体
            title.getCell(0).setCellStyle(style);        //给标题设置样式
    
        }
        private static Row InitExcelHead(SXSSFWorkbook workBook, Sheet sheet, String[] head) {
    
            Row row = sheet.createRow(1);
            CellStyle style = getHeaderStyle(workBook);             //获取表头样式
            for(int i=0; i<head.length; i++){            row.createCell(i).setCellValue(head [i]);
                row.getCell(i).setCellStyle(style);                 //设置标题样式
            }
            return row;
    
        }
    
        private static void setExcelValue(SXSSFWorkbook workBook, Sheet sheet, String[] head) {
    
            StringBuffer buffer = new StringBuffer();
            for(int i=0; i<1000000; i++){
                //sheet.createRow(i+2) 2003excel参数里面的类型是int，所以一次只能导出65535条数据
                Row row = sheet.createRow(i+2);            for(int j=0; j < head.length; j++){
                    buffer.append("数据行"+(i+1));
                    buffer.append("列"+(j+1));
                    row.createCell(j).setCellValue(buffer.toString());
                    buffer.delete(0, buffer.length());
                }
            }
    
        }
    
        private static void excelExport(SXSSFWorkbook workBook) {
    
            String filePath = getSavePath();  //获取文件保存路径
            if(filePath == null){            System.exit(1);
                return;
            }
    
            String srcFile = "D:\\Excel多线程导出.xlsx";
            FileOutputStream fileOut = null ;
            try {
                File file = new File(srcFile);
                if(file.exists()){  //当文件已存在时
                    //删除原Excel      打开新导出的Excel时，最好刷新下当前文件夹，以免重复操作有时出现缓存。
                    file.delete();            }
                fileOut = new FileOutputStream(file);
                workBook.write(fileOut);
    
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    fileOut.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    
        private static String getSavePath() {
    
            // 选择保存路径
            String selectPath = null;        JFileChooser chooser = new JFileChooser();
            chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);//设置只能选择目录
            int returnVal = chooser.showOpenDialog(null);        if(returnVal == JFileChooser.APPROVE_OPTION) {
                selectPath =chooser.getSelectedFile().getPath() ;
            }
            return selectPath;
        }
        public static CellStyle getHeaderStyle(SXSSFWorkbook workbook) {
    
            CellStyle style = workbook.createCellStyle();
            style.setBorderBottom(HSSFCellStyle.BORDER_MEDIUM);  //下边框
            style.setBorderLeft(HSSFCellStyle.BORDER_MEDIUM);    //左边框
            style.setBorderRight(HSSFCellStyle.BORDER_MEDIUM);        style.setBorderTop(HSSFCellStyle.BORDER_MEDIUM);
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER);      //居中
            style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直居中
            style.setTopBorderColor(HSSFColor.BLACK.index);     //上边框颜色
            style.setBottomBorderColor(HSSFColor.BLACK.index);        style.setLeftBorderColor(HSSFColor.BLACK.index);
            style.setRightBorderColor(HSSFColor.BLACK.index);
            Font font = workbook.createFont();               // 创建字体样式
            font.setFontName("宋体");        font.setFontHeightInPoints((short) 14);              // 字体大小
            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);        // 加粗
            style.setFont(font);                                 //给样式指定字体
    
            return style;
    
        }
    
    
    }

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