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一次大数据量导出优化-

一次大数据量导出优化-

最近遇到一个问题，线上生产环境某个功能导出数据到excel文件非常缓慢，几万数据导十多分钟都导不出来，导出慢的原因一是主表A数据量太大，接近2亿，另外里面部分数据来自于另外一张表B，B表也是几千万的数据量，数据库层面能做的优化已经做了，视图、索引这些工具都上了（没有分表是一开始项目设计阶段就没考虑，后面也没有专人维护，是另外一段故事了，这里不展开描述），但是依旧很慢，那就只能改导出代码了。

项目原来使用的是jxl来导出，生成的是xls格式Excel文件，这是旧版本的Excel文件，缺点有两点：一是单sheet页数据量小，只有6万多，二是文件太大，同等数据量下，xlsx格式的比xls格式的文件小4倍。一番搜索后，发现了POI自3.8版本后新加了一个SXSSFWorkbook类，可以处理大数据量的导出，并且内存占用不高，下面是一个小demo，写入10万行数据花费11065ms，文件大小14M不到，可以说很高效了。

package exceltest;

import java.io.FileOutputStream;

import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellUtil;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class SXSSFWorkbookTest {

	public static void main(String[] args) {
		long start = System.currentTimeMillis();
		Excel2007AboveOperate();
		long end = System.currentTimeMillis();
		System.out.println("花费:"+(end-start));//10万数据花费:11065
	}
	
	public static void Excel2007AboveOperate() {
        XSSFWorkbook workbook1 = new XSSFWorkbook();
        SXSSFWorkbook sxssfWorkbook = new SXSSFWorkbook(workbook1, 100);
		for (int i = 0; i < 10; i++) {
        	sxssfWorkbook.createSheet();
        	sxssfWorkbook.setSheetName(i, "第"+i+"页");
        	Sheet first = sxssfWorkbook.getSheetAt(i);
            for (int j = 0; j < 10000; j++) {
                Row row = first.createRow(j);
                for (int k = 0; k < 11; k++) {
                    if(j == 0) {
                        // 首行
                        row.createCell(k).setCellValue("column" + k);
                    } else {
                        // 数据
                        if (k == 0) {
                            CellUtil.createCell(row, k, String.valueOf(j));
                        } else
                            CellUtil.createCell(row, k, String.valueOf(Math.random()));
                    }
                }
            }
        }
        FileOutputStream out;
		try {
			out = new FileOutputStream("F:\workbook666.xlsx");
			sxssfWorkbook.write(out);
	        out.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

以为故事到这里就结束了，然而事情并没有那么简单！生产环境有个包集成了POI的代码，也可以用SXSSFWorkbook这个nb的类，但是会报错java.lang.RuntimeException: Provider for class javax.xml.stream.XMLEventFactory cannot be created，查找一番下来，有说缺少依赖包的，有说jdk版本低云云，单独引用最新的POI包，依旧是报错，怀疑是集成包里的poi代码缺少了一些东西，至于是什么无从考量，只能另辟蹊径来解决这个导出问题了，只要是依赖POI包的方法都不行，只有找到不依赖POI包却依然能导出excel文件方法才行！

又是一番寻找，看到了一篇博客，讲的是xls文件的本质其实是一个xml文件，可以通过手动拼接的方式来生成一个符合xls格式的xml文件，原博客文章暂时没找到，如果原作者看到可以留言提醒下。直接上demo代码。

package exceltest;

import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Xml2ExcelTest {

	public static void main(String[] args) {
		test2();
	}
	
	
	public static void test2() {
		StringBuffer sb = new StringBuffer();
		File file = new File("F://testxml2xls666.xls");
        try {
			DataOutputStream rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(file)));
			sb.append("<?xml version="1.0"?>
");
			sb.append("<?mso-application progid="Excel.Sheet"?>
");
			sb.append("<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
");
			sb.append("  xmlns:o="urn:schemas-microsoft-com:office:office"
");
			sb.append(" xmlns:x="urn:schemas-microsoft-com:office:excel"
");
			sb.append(" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
");
			sb.append(" xmlns:html="http://www.w3.org/TR/REC-html40">
");
			sb.append(" <Styles>
");
			sb.append("  <Style ss:ID="Default" ss:Name="Normal">
");
			sb.append("   <Alignment ss:Vertical="Center"/>
");
			sb.append("   <Borders/>
");
			sb.append("   <Font ss:FontName="宋体" x:CharSet="134" ss:Size="12"/>
");
			sb.append("   <Interior/>
");
			sb.append("   <NumberFormat/>
");
			sb.append("   <Protection/>
");
			sb.append("  </Style>
");
			sb.append(" </Styles>
");
            
            int maxRow = 10;
            int maxCol = 10;
            for (int i = 0; i < 5; i++) {
            	sb.append("<Worksheet ss:Name="第").append(i).append("页">
");  
                sb.append("<Table ss:ExpandedColumnCount="").append(maxRow).append("" ss:ExpandedRowCount="");
                sb.append(maxCol).append("" x:FullColumns="1" x:FullRows="1">
");
                for (int j = 0; j < maxRow; j++) {
                	sb.append("<Row>
");
                	sb.append("<Cell><Data ss:Type="String">").append("还好").append(i).append("</Data></Cell>
");  
                    sb.append("<Cell><Data ss:Type="String">").append(String.valueOf(Math.random())).append("</Data></Cell>
");  
                    sb.append("<Cell><Data ss:Type="String">").append(String.valueOf(Math.random())).append("</Data></Cell>
");  
                    sb.append("<Cell><Data ss:Type="String">").append(String.valueOf(Math.random())).append("</Data></Cell>
");  
                    sb.append("<Cell><Data ss:Type="String">").append(String.valueOf(Math.random())).append("</Data></Cell>
");  
                    sb.append("<Cell><Data ss:Type="String">").append(String.valueOf(Math.random())).append("</Data></Cell>
");  
                    sb.append("<Cell><Data ss:Type="String">").append(String.valueOf(Math.random())).append("</Data></Cell>
");  
                    sb.append("<Cell><Data ss:Type="String">").append(String.valueOf(Math.random())).append("</Data></Cell>
");  
                    sb.append("<Cell><Data ss:Type="String">").append(String.valueOf(Math.random())).append("</Data></Cell>
");  
                    sb.append("<Cell><Data ss:Type="String">").append(String.valueOf(Math.random())).append("</Data></Cell>
");  
                    sb.append("</Row>
");
                }  
                sb.append("</Table>
");
                sb.append("<WorksheetOptions xmlns="urn:schemas-microsoft-com:office:excel">
");  
                sb.append("<ProtectObjects>False</ProtectObjects>
");  
                sb.append("<ProtectScenarios>False</ProtectScenarios>
");  
                sb.append("</WorksheetOptions>
");
                sb.append("</Worksheet>
");
                rafs.write(sb.toString().getBytes());
                rafs.flush();
                sb = null;
                sb = new StringBuffer();
            }
			sb.append("</Workbook>
");  
			rafs.write(sb.toString().getBytes());  
            rafs.flush();
            rafs.close();  
        } catch (FileNotFoundException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
	}

}

demo可行，拿正式数据做测试，10万数据可以正常导出，速度比之前通过jxl导出快，但是有个缺点很明显，就是文件太大了，如果上生产，那文件大小估计得按G来算，这个方法也无法胜任啊！但是却提供了一种思路，既然xls文件能通过xml文件间接得到，那么xlsx文件是否也可行？想到就干！

又是一番查找，找到了一半的答案，喜忧参半吧！喜的是这个思路行得通，xlsx文件其实是一个压缩文件，可以将后缀改为zip解压，里面包含了很多的xml文件，可以用多线程逐个击破，同时解决写入和效率问题，大家可以在自己电脑上试下，你会发现新大陆的。忧的是里面每个单元格值不是明文，是键值对，需要准备一个很大的数据结构来存储。于是将本地新建的xlsx文件和通过代码生成的xlsx文件做个了比较，代码生成的xml文件里是直接放的明文，难道是我本地Office版本太高了？可能是吧，问题暂且放一边，先把demo跑通过才是正事。

先看下解压出来的文件结构：

_rels/.rels

docProps/app.xml
docProps/core.xml

xl/_rels/workbook.xml.rels
xl/worksheets/sheet1.xml
......
xl/worksheets/sheetn.xml
xl/sharedStrings.xml
xl/styles.xml
xl/workbook.xml

[Content_Types].xml

_rels/.rels文件内容是固定的，可以直接写。

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
	<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
	<Relationship Id="rId1" Target="xl/workbook.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument"/>
	<Relationship Id="rId2" Target="docProps/app.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties"/>
	<Relationship Id="rId3" Target="docProps/core.xml" Type="http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties"/>
	</Relationships>

docProps/app.xml文件内容是固定的，可以直接写。

<?xml version="1.0" encoding="UTF-8"?>
	<Properties xmlns="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties"><Application>Apache POI</Application></Properties>

docProps/core.xml文件里面需要注意下创建时间，这个时间格式需要特殊处理下。

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
	<cp:coreProperties xmlns:cp="http://schemas.openxmlformats.org/package/2006/metadata/core-properties" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<dcterms:created xsi:type="dcterms:W3CDTF">2021-12-16T12:10:02Z</dcterms:created>
	<dc:creator>Apache POI</dc:creator>
	</cp:coreProperties>

xl/sharedStrings.xml文件内容是固定的，可以直接写。

<?xml version="1.0" encoding="UTF-8"?>
	<sst count="0" uniqueCount="0" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"/>

xl/styles.xml样式文件，需要自定义样式的可以提前通过代码生成。

<?xml version="1.0" encoding="UTF-8"?>
	<styleSheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"><numFmts count="0"/><fonts count="1"><font><sz val="11.0"/><color indexed="8"/><name val="Calibri"/><family val="2"/><scheme val="minor"/></font></fonts><fills count="2"><fill><patternFill patternType="none"/></fill><fill><patternFill patternType="darkGray"/></fill></fills><borders count="1"><border><left/><right/><top/><bottom/><diagonal/></border></borders><cellStyleXfs count="1"><xf numFmtId="0" fontId="0" fillId="0" borderId="0"/></cellStyleXfs><cellXfs count="1"><xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0"/></cellXfs></styleSheet>

xl/workbook.xmlsheet页的信息文件，每个sheet页都有一个id，是一一对应的关系。name是表名，可以自定义，sheetId从1开始，r:id从rId3开始。

<?xml version="1.0" encoding="UTF-8"?>
<workbook xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"      xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
<workbookPr date1904="false"/>
<bookViews>
  <workbookView activeTab="0"/>
</bookViews>
<sheets>
  <sheet sheetId="1" r:id="rId3" name="第0页"/>
  <sheet sheetId="2" r:id="rId4" name="第1页"/>
  <sheet sheetId="3" r:id="rId5" name="第2页"/>
  <sheet sheetId="4" r:id="rId6" name="第3页"/>
  <sheet sheetId="5" r:id="rId7" name="第4页"/>
  <sheet sheetId="6" r:id="rId8" name="第5页"/>
  <sheet sheetId="7" r:id="rId9" name="第6页"/>
  <sheet sheetId="8" r:id="rId10" name="第7页"/>
  <sheet sheetId="9" r:id="rId11" name="第8页"/>
  <sheet sheetId="10" r:id="rId12" name="第9页"/>
</sheets>
</workbook>

xl/_rels/workbook.xml.relssheet的依赖文件信息，rId1和rId2都是固定的，从rId3开始对应创建的sheet页文件路径。

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
<Relationship Id="rId1" Target="sharedStrings.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings"/>
<Relationship Id="rId2" Target="styles.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"/>
<Relationship Id="rId3" Target="worksheets/sheet1.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
<Relationship Id="rId4" Target="worksheets/sheet2.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
<Relationship Id="rId5" Target="worksheets/sheet3.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
<Relationship Id="rId6" Target="worksheets/sheet4.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
<Relationship Id="rId7" Target="worksheets/sheet5.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
<Relationship Id="rId8" Target="worksheets/sheet6.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
<Relationship Id="rId9" Target="worksheets/sheet7.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
<Relationship Id="rId10" Target="worksheets/sheet8.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
<Relationship Id="rId11" Target="worksheets/sheet9.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
<Relationship Id="rId12" Target="worksheets/sheet10.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
</Relationships>

[Content_Types].xml汇总文件，里面包含了xlsx文件依赖的相关xml文件信息

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
<Default ContentType="application/vnd.openxmlformats-package.relationships+xml" Extension="rels"/>
<Default ContentType="application/xml" Extension="xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.extended-properties+xml" PartName="/docProps/app.xml"/>
<Override ContentType="application/vnd.openxmlformats-package.core-properties+xml" PartName="/docProps/core.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sharedStrings+xml" PartName="/xl/sharedStrings.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.styles+xml" PartName="/xl/styles.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml" PartName="/xl/workbook.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet1.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet2.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet3.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet4.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet5.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet6.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet7.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet8.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet9.xml"/>
<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/sheet10.xml"/>
</Types>

xl/worksheets/sheet1.xmlsheet页数据文件，其中第一个sheet页是默认选中打开的sheet页，会加上tabSelected="true"属性，只能在其中一个xml文件里设置，不能给多个sheet页xml文件设置。行号从1开始，列号从大写的英文字母加数字(也是从1开始)组成。cols标签里的col标签是设置列宽，列号通过min="1" max="1"这两个标签定义，也是从1开始。合并单元格使用<mergeCells></mergeCells>标签，跟在</sheetData>标签后面，比如想要合并A1到D1，可以这样写<mergeCells><mergeCell ref="A1:D1"/></mergeCells>。

<?xml version="1.0" encoding="UTF-8"?>
<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
<dimension ref="A1"/>
<sheetViews><sheetView workbookViewId="0" tabSelected="true"/></sheetViews>
<sheetFormatPr defaultRowHeight="15.0"/>
<cols>
<col min="1" max="1" width="8.71875" customWidth="true"/>
</cols>
<sheetData>
<row r="1">
<c r="A1" t="inlineStr"><is><t>column0</t></is></c>
<c r="B1" t="inlineStr"><is><t>column1</t></is></c>
<c r="C1" t="inlineStr"><is><t>column2</t></is></c>
<c r="D1" t="inlineStr"><is><t>column3</t></is></c>
<c r="E1" t="inlineStr"><is><t>column4</t></is></c>
<c r="F1" t="inlineStr"><is><t>column5</t></is></c>
<c r="G1" t="inlineStr"><is><t>column6</t></is></c>
<c r="H1" t="inlineStr"><is><t>column7</t></is></c>
<c r="I1" t="inlineStr"><is><t>column8</t></is></c>
<c r="J1" t="inlineStr"><is><t>column9</t></is></c>
<c r="K1" t="inlineStr"><is><t>column10</t></is></c>
......
</sheetData>
<pageMargins bottom="0.75" footer="0.3" header="0.3" left="0.7" right="0.7" top="0.75"/>
</worksheet>

以上就是一个xlsx文件里包含的xml文件，使用IO流将相关的信息写入到xml文件中去，最后压缩成xlsx文件，就可以得到一个xlsx格式的excel文件了。

但是其中有个点需要注意，压缩方法不能使用java.util.zip里的，用java.util.zip得到的压缩文件打开会提示文件损坏，得换成apache的compress方法，因为这是poi相关包源码用到的压缩方法。至于为什么用java.util.zip生成的文件打不开，这个原因暂时未知。

下面是用写xml文件生成xlsx文件的代码demo。

package exceltest;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.function.Supplier;

import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
import org.apache.commons.compress.utils.IOUtils;

/**
 * 借助xml文件生成xlsx文件
 * @author 程序员小川
 * @date 2021-12-21
 *
 */
public class XML2XlsxFileDemo {

	public static void main(String[] args) {
		testM();

		try {
			File file = new File("F:\test996.xlsx");
			FileOutputStream outputStreamExcel = new FileOutputStream(file);
			ZipArchiveOutputStream zos = new ZipArchiveOutputStream(outputStreamExcel);
			compressDirectoryToZipfile("F:\xlsxtest222", "F:\xlsxtest222", zos);
			zos.flush();
			zos.finish();
			zos.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private static void compressDirectoryToZipfile(String rootDir, String sourceDir, ZipArchiveOutputStream out) throws IOException {
	    try {
	    	File[] files = new File(sourceDir).listFiles();
		    assert files != null;
		    for (File file : files) {
		        if (file.isDirectory()) {
		            compressDirectoryToZipfile(rootDir, sourceDir + File.separator + file.getName(), out);
		        } else {
		            ZipArchiveEntry entry = new ZipArchiveEntry(file.getAbsolutePath().substring(rootDir.length() + 1));
		            out.putArchiveEntry(entry);
		            try (InputStream in = new BufferedInputStream(new FileInputStream(sourceDir + File.separator + file.getName()))) {
		            	IOUtils.copy(in, out);
		            }
		            out.closeArchiveEntry();
		        }
		    }
	    } catch(Exception e) {
	    	e.printStackTrace();
	    }
	}
	
	public static void testM() {
		String filefolder = "F:\xlsxtest222";
		try {
			File fo = new File(filefolder + File.separator + "_rels");
			if (!fo.exists()) {
				fo.mkdirs();
			}
			fo = new File(filefolder + File.separator + "docProps");
			if (!fo.exists()) {
				fo.mkdirs();
			}
			fo = new File(filefolder + File.separator + "xl" + File.separator + "_rels");
			if (!fo.exists()) {
				fo.mkdirs();
			}
			fo = new File(filefolder + File.separator + "xl" + File.separator + "worksheets");
			if (!fo.exists()) {
				fo.mkdirs();
			}
			
			File _rels_f = new File(filefolder + File.separator + "_rels" + File.separator + ".rels");
			if (!_rels_f.exists()) {
				_rels_f.createNewFile();
			}
			DataOutputStream rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(_rels_f)));
			StringBuilder sb = new StringBuilder();
			sb.append("<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
");
			sb.append("<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
");
			sb.append("<Relationship Id="rId1" Target="xl/workbook.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument"/>
");
			sb.append("<Relationship Id="rId2" Target="docProps/app.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties"/>
");
			sb.append("<Relationship Id="rId3" Target="docProps/core.xml" Type="http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties"/>
");
			sb.append("</Relationships>");
			rafs.write(sb.toString().getBytes());
			rafs.flush();
			rafs.close();
			
			File docProps_appxml_f = new File(filefolder + File.separator + "docProps" + File.separator + "app.xml");
			if (!docProps_appxml_f.exists()) {
				docProps_appxml_f.createNewFile();
			}
			rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(docProps_appxml_f)));
			sb = new StringBuilder();
			sb.append("<?xml version="1.0" encoding="UTF-8"?>
");
			sb.append("<Properties xmlns="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties"><Application>Apache POI</Application></Properties>
");
			rafs.write(sb.toString().getBytes());
			rafs.flush();
			rafs.close();
			
			File docProps_corexml_f = new File(filefolder + File.separator + "docProps" + File.separator + "core.xml");
			if (!docProps_corexml_f.exists()) {
				docProps_corexml_f.createNewFile();
			}
			rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(docProps_corexml_f)));
			sb = new StringBuilder();
			sb.append("<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
");
			sb.append("<cp:coreProperties xmlns:cp="http://schemas.openxmlformats.org/package/2006/metadata/core-properties" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
");
			//格式化创建时间
			SimpleDateFormat datestr = new SimpleDateFormat("yyyy-MM-dd"T"HH:mm:ss.SSS"Z"");
			String date = datestr.format(new Date());
			sb.append("<dcterms:created xsi:type="dcterms:W3CDTF">").append(date).append("</dcterms:created>
");
			sb.append("<dc:creator>Apache POI</dc:creator>
");
			sb.append("</cp:coreProperties>");
			rafs.write(sb.toString().getBytes());
			rafs.flush();
			rafs.close();
			
			File xl_sharedStrings_f = new File(filefolder + File.separator + "xl" + File.separator + "sharedStrings.xml");
			if (!xl_sharedStrings_f.exists()) {
				xl_sharedStrings_f.createNewFile();
			}
			rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(xl_sharedStrings_f)));
			sb = new StringBuilder();
			sb.append("<?xml version="1.0" encoding="UTF-8"?>
");
			sb.append("<sst count="0" uniqueCount="0" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"/>");
			rafs.write(sb.toString().getBytes());
			rafs.flush();
			rafs.close();
			
			File xl_styles_f = new File(filefolder + File.separator + "xl" + File.separator + "styles.xml");
			if (!xl_styles_f.exists()) {
				xl_styles_f.createNewFile();
			}
			rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(xl_styles_f)));
			sb = new StringBuilder();
			sb.append("<?xml version="1.0" encoding="UTF-8"?>
");
			sb.append("<styleSheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"><numFmts count="0"/><fonts count="1"><font><sz val="11.0"/><color indexed="8"/><name val="Calibri"/><family val="2"/><scheme val="minor"/></font></fonts><fills count="2"><fill><patternFill patternType="none"/></fill><fill><patternFill patternType="darkGray"/></fill></fills><borders count="1"><border><left/><right/><top/><bottom/><diagonal/></border></borders><cellStyleXfs count="1"><xf numFmtId="0" fontId="0" fillId="0" borderId="0"/></cellStyleXfs><cellXfs count="1"><xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0"/></cellXfs></styleSheet>");
			rafs.write(sb.toString().getBytes());
			rafs.flush();
			rafs.close();
			
			File xl_workbook_f = new File(filefolder + File.separator + "xl" + File.separator + "workbook.xml");
			if (!xl_workbook_f.exists()) {
				xl_workbook_f.createNewFile();
			}
			rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(xl_workbook_f)));
			sb = new StringBuilder();
			sb.append("<?xml version="1.0" encoding="UTF-8"?>
");
			sb.append("<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">
");
			sb.append("<workbookPr date1904="false"/>
");
			sb.append("<bookViews>
");
			sb.append("<workbookView activeTab="0"/>
");
			sb.append("</bookViews>
");
			sb.append("<sheets>
");
			for (int i=0; i<10;i++) {
				sb.append("<sheet name="第").append(i).append("页" r:id="rId").append(i+3).append("" sheetId="").append(i+1).append(""/>
");
			}
			sb.append("</sheets>
");
			sb.append("</workbook>
");
			rafs.write(sb.toString().getBytes());
			rafs.flush();
			rafs.close();
			
			
			ExecutorService completableFutureExecutor = Executors.newCachedThreadPool();
			List<CompletableFuture<String>> futures = new ArrayList<>();
	        for (int i = 0; i < 10; i++) {
	        	final int fi = i;
	        	CompletableFuture<String> completableFuture = CompletableFuture.supplyAsync(new Supplier<String>() {
	    			@Override
	    			public String get() {
	    				try {
	    					return createNewSheet(fi);
	    				} catch (Exception e) {
	    					e.printStackTrace();
	    					return null;
	    				}
	    			}
	    		}, completableFutureExecutor);
	        	
	            futures.add(completableFuture);
	        }
	        //等待全部完成
	        CompletableFuture.allOf(futures.toArray(new CompletableFuture[0])).join();
	        
	        File xl__rels_workbookxml_f = new File(filefolder + File.separator + "xl" + File.separator +"_rels"+ File.separator + "workbook.xml.rels");
			if (!xl__rels_workbookxml_f.exists()) {
				xl__rels_workbookxml_f.createNewFile();
			}
			rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(xl__rels_workbookxml_f)));
			sb = new StringBuilder();
			sb.append("<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
");
			sb.append("<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
"); 
			sb.append("<Relationship Id="rId1" Target="sharedStrings.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings"/>
"); 
			sb.append("<Relationship Id="rId2" Target="styles.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"/>
");
			for (int j = 0; j < futures.size(); j++) {
				String val = futures.get(j).get();
				sb.append("<Relationship Id="rId").append(j+3).append("" Target="worksheets/").append(val).append("" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"/>
");
			}
			sb.append("</Relationships>");
			rafs.write(sb.toString().getBytes());
			rafs.flush();
			rafs.close();
			
			
			File Content_Types_f = new File(filefolder + File.separator + "[Content_Types].xml");
			if (!Content_Types_f.exists()) {
				Content_Types_f.createNewFile();
			}
			rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(Content_Types_f)));
			sb = new StringBuilder();
			sb.append("<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
");
			sb.append("<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
"); 
			sb.append("<Default ContentType="application/vnd.openxmlformats-package.relationships+xml" Extension="rels"/>
");
			sb.append("<Default ContentType="application/xml" Extension="xml"/>
"); 
			sb.append("<Override ContentType="application/vnd.openxmlformats-officedocument.extended-properties+xml" PartName="/docProps/app.xml"/>
"); 
			sb.append("<Override ContentType="application/vnd.openxmlformats-package.core-properties+xml" PartName="/docProps/core.xml"/>
");
			sb.append("<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sharedStrings+xml" PartName="/xl/sharedStrings.xml"/>
"); 
			sb.append("<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.styles+xml" PartName="/xl/styles.xml"/>
"); 
			sb.append("<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml" PartName="/xl/workbook.xml"/>
");
			for (int j = 0; j < futures.size(); j++) {
				String val = futures.get(j).get();
				sb.append("<Override ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" PartName="/xl/worksheets/").append(val).append(""/>
");
			}
			sb.append("</Types>");
			rafs.write(sb.toString().getBytes());
			rafs.flush();
			rafs.close();
			
			completableFutureExecutor.shutdown();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public static String createNewSheet(int i) {
		String filename = "sheet" + (i+1) + ".xml";
		try {
			String filefolder = "F:\xlsxtest222";
			File _rels_f = new File(filefolder + File.separator + "xl" + File.separator + "worksheets" + File.separator + filename);
			if (!_rels_f.exists()) {
				_rels_f.createNewFile();
			}
			DataOutputStream rafs = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(_rels_f)));
			StringBuilder sb = new StringBuilder();
			sb.append("<?xml version="1.0" encoding="UTF-8"?>
");
			if (i == 0) {
				sb.append("<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"><dimension ref="A1"/><sheetViews><sheetView workbookViewId="0" tabSelected="true"/></sheetViews><sheetFormatPr defaultRowHeight="15.0"/><sheetData>
");
			} else {
				sb.append("<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"><dimension ref="A1"/><sheetViews><sheetView workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15.0"/><sheetData>
");
			}
			for (int j = 0; j < 100; j++) {
				if (j == 0) {
					sb.append("<row r="").append(j+1).append("">
");
					sb.append("<c r="A1" t="inlineStr"><is><t>column0</t></is></c>");
					sb.append("<c r="B1" t="inlineStr"><is><t>column1</t></is></c>");
					sb.append("<c r="C1" t="inlineStr"><is><t>column2</t></is></c>");
					sb.append("<c r="D1" t="inlineStr"><is><t>column3</t></is></c>");
					sb.append("<c r="E1" t="inlineStr"><is><t>column4</t></is></c>");
					sb.append("<c r="F1" t="inlineStr"><is><t>column5</t></is></c>");
					sb.append("<c r="G1" t="inlineStr"><is><t>column6</t></is></c>");
					sb.append("<c r="H1" t="inlineStr"><is><t>column7</t></is></c>");
					sb.append("<c r="I1" t="inlineStr"><is><t>column8</t></is></c>");
					sb.append("<c r="J1" t="inlineStr"><is><t>column9</t></is></c>");
					sb.append("<c r="K1" t="inlineStr"><is><t>column10</t></is></c>");
					sb.append("</row>
");
				} else {
					sb.append("<row r="").append(j+1).append("">
");
					sb.append("<c r="A").append(j+1).append("" t="inlineStr"><is><t>").append(j).append("</t></is></c>");
					sb.append("<c r="B").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("<c r="C").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("<c r="D").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("<c r="E").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("<c r="F").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("<c r="G").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("<c r="H").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("<c r="I").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("<c r="J").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("<c r="K").append(j+1).append("" t="inlineStr"><is><t>").append(String.valueOf(Math.random())).append("</t></is></c>");
					sb.append("</row>
");
				}
			}
			sb.append("</sheetData><pageMargins bottom="0.75" footer="0.3" header="0.3" left="0.7" right="0.7" top="0.75"/></worksheet>");
			rafs.write(sb.toString().getBytes());
			rafs.flush();
			rafs.close();
			return filename;
		} catch(Exception e) {
			e.printStackTrace();
			return null;
		}
	}
	
}

需要使用的依赖包commons-compressmaven坐标如下：

<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-compress</artifactId>
  <version>1.20</version>
</dependency>

以上就是全部内容，转载请注明出处。

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