Question

Java开发人员的库有大量不适用于Android的方法。

我开始使用像OpenCSV这样的库，但不幸的是Excel有known issues打开了CSV文件。

然后我尝试使用：

Apache POI - 肯定有太多方法。
JExcelAPI - 它可以工作，但仅适用于旧的二进制.xls文件。
docx4j - 太多的罐子，因为它基于JAXB而不包含在Android中。

我的问题是，如何在Android上创建.xlsx格式的简单Excel文件，而不超过65k方法？

Answer 1

第一个答案：做服务器端。

如果这不可能，只需使用JExecelAPI - 几乎所有读取xlsx文件的内容都会读取xls文件。

每个其他Excel库都会太大了。

另一个想法 - 手动编写csv文件，或者使用许多可用的csv库之一。同样，大多数读取Excel文件的应用程序也会读取csv文件。

Answer 2

由于这个问题似乎相反：“为Excel创建Office Open XML文件的最轻量级方法是什么（*.xlsx）？”，我将提供一个不需要任何库的示例，除了默认{ {1}}，java.lang和java.io。

java.util.zip文件只是包含XML文件和目录结构中其他文件的ZIP存档。因此，我们所需要的是创建，读取和编写ZIP存档以及创建，读取和编写XML文件的可能性。对于我使用*.xlsx的ZIP部分，对于XML部分，我使用字符串操作。这通过字符串操作创建和操作XML并不是最常用的操作XML的方法，但它是最轻量级的方式，因为它不需要任何额外的XML库。

完整示例：

java.util.zip

Answer 3

2018年。使用Microsoft Graph API并在O365中创建Excel文件。

Microsoft已在Angular和C＃中发布了一些示例。它不是Java，但它是一个很好的起点：https://developer.microsoft.com/en-us/graph/docs/concepts/excel-write-to-workbook。

MS Graph Java SDK与Android兼容。

限制 - 没有简单的方法可以使用API从头开始创建Excel文件。您可能希望保留一个空白工作簿并每次都克隆它。

Answer 4

使用Apache POI并通过简单地将Image img = (Image)sender; var selectedImage = img.Source as FileImageSource; if (selectedImage.File == "unchecked_checkbox") { // perform action checkbox is checked; img.Source = "checked_checkbox"; } if (selectedImage.File == "checked_checkbox") { // perform action when checkbox is unchecked img.Source = "unchecked_checkbox"; } }添加到compile "com.android.support:multidex:1.0.1"中的依赖项来启用多dex。您还需要设置multiDexEnabled为true。这应该摆脱65k方法的限制。

Answer 5

如果您不需要从任何来源读取xlsx文件，我建议您使用CSV excel完全能够将该类型转换为其任何标准输出。

即使您需要公式，单元格格式化，也可以使用您引用的lib或使用您自己的xml解析器，如我之前的许多人所说，excel格式只是一个带有xml的zip。那些xml在这里描述：

https://msdn.microsoft.com/en-us/library/dd979921(v=office.12).aspx

正如您将发现excel格式非常复杂，简单的后向兼容性不是他们的首选。因此，使用XPath或JAXB创建自己的受限解析器将是一项繁重的工作，但并非不可能。

但我不明白你为什么要限制数量的方法？如果它是关于制作一些嵌入式软件，在我看来，你不应该使用.xlsx，这是一个复杂而繁重的文件，只是为了节省网格......

Answer 6

我正在扩展Axel Richter的答案下面的代码将为您添加功能，以便您动态添加列和值。

导入android.os.Build;

import androidx.annotation.RequiresApi;

import java.io.ByteArrayOutputStream;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.zip.*;

@SuppressWarnings("WeakerAccess")
@RequiresApi(api = Build.VERSION_CODES.O)
public class ExcelSpreadSheet {

//some static parts of the XLSX file:

String content_types_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><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\"/></Types>";

String docProps_app_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><Properties xmlns=\"http://schemas.openxmlformats.org/officeDocument/2006/extended-properties\"><Application>" + "Created Low level From Scratch" + "</Application></Properties>";

String docProps_core_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><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\">" + java.time.Instant.now().truncatedTo(java.time.temporal.ChronoUnit.SECONDS).toString() + "</dcterms:created><dc:creator>" + "Axel Richter from scratch" + "</dc:creator></cp:coreProperties>";

String _rels_rels_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><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>";

String xl_rels_workbook_xml_rels_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><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\"/></Relationships>";

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

String xl_styles_xml = "<?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>";

String xl_workbook_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><workbook xmlns=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\"><workbookPr date1904=\"false\"/><bookViews><workbookView activeTab=\"0\"/></bookViews><sheets><sheet name=\"" + "Sheet1" + "\" r:id=\"rId3\" sheetId=\"1\"/></sheets></workbook>";

String xl_worksheets_sheet1_xml = "<?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\"/><sheetData/><pageMargins bottom=\"0.75\" footer=\"0.3\" header=\"0.3\" left=\"0.7\" right=\"0.7\" top=\"0.75\"/></worksheet>";

ArrayList<ArrayList<Object>> sheetDat = new ArrayList<>();
ArrayList<Object> sheetKeys = new ArrayList<>();

ExcelSpreadSheet() {
    sheetDat.add(0, new ArrayList<>());
}

int addFirstColumnKey(String key) {
    if (!sheetKeys.contains(key)) {
        if (sheetKeys.size() > 26) return -1;
        sheetKeys.add(key);
    }
    return sheetKeys.indexOf(key);
}

void addValueToRow(int rowID, String keyName, Object value) {
    addFirstColumnKey("ID");
    int columnEdit = addFirstColumnKey(keyName);
    if (columnEdit == -1) return;//ERROR
    int editingRow = -1;
    for (int i = 0; i < sheetDat.size(); i++) {
        if (sheetDat.get(i).get(0).equals(rowID)) {
            editingRow = i;
        }
    }
    if (editingRow == -1) {
        sheetDat.add(new ArrayList<>());
        editingRow = sheetDat.size() - 1;
    }
    if (sheetDat.get(editingRow).size() < sheetKeys.size()) {
        for (int a = 0; a < sheetKeys.size(); a++) {
            sheetDat.get(editingRow).add(0);
        }
    }
    sheetDat.get(editingRow).set(columnEdit, value);
    sheetDat.get(editingRow).set(0, rowID);
}

private class Sort implements Comparator<ArrayList<Object>> {
    int sortColumn;

    Sort(int columnToSortBy) {
        sortColumn = columnToSortBy;
    }

    public int compare(ArrayList<Object> a, ArrayList<Object> b) {
        if (a.size() < sortColumn || a.get(sortColumn) == null) {
            return 0;
        } else if (a.get(sortColumn) instanceof String) {
            return ((String) a.get(sortColumn)).compareTo(((String) b.get(sortColumn)));
        } else if (a.get(sortColumn) instanceof Integer) {
            return ((Integer) a.get(sortColumn)).compareTo(((Integer) b.get(sortColumn)));
        } else if (a.get(sortColumn) instanceof Long) {
            return ((Long) a.get(sortColumn)).compareTo(((Long) b.get(sortColumn)));
        } else if (a.get(sortColumn) instanceof Double) {
            return ((Double) a.get(sortColumn)).compareTo(((Double) b.get(sortColumn)));
        }
        return 0;
    }
}

void exportToFile() throws Exception {

    // result goes into a ByteArrayOutputStream
    ByteArrayOutputStream resultout = new ByteArrayOutputStream();

    // needed objects
    ZipEntry zipentry;
    byte[] data;

    // create ZipOutputStream
    ZipOutputStream zipout = new ZipOutputStream(resultout);

    // create the static parts of the XLSX ZIP file:

    zipentry = new ZipEntry("[Content_Types].xml");
    zipout.putNextEntry(zipentry);
    data = content_types_xml.getBytes();
    zipout.write(data, 0, data.length);
    zipout.closeEntry();

    zipentry = new ZipEntry("docProps/app.xml");
    zipout.putNextEntry(zipentry);
    data = docProps_app_xml.getBytes();
    zipout.write(data, 0, data.length);
    zipout.closeEntry();

    zipentry = new ZipEntry("docProps/core.xml");
    zipout.putNextEntry(zipentry);
    data = docProps_core_xml.getBytes();
    zipout.write(data, 0, data.length);
    zipout.closeEntry();

    zipentry = new ZipEntry("_rels/.rels");
    zipout.putNextEntry(zipentry);
    data = _rels_rels_xml.getBytes();
    zipout.write(data, 0, data.length);
    zipout.closeEntry();

    zipentry = new ZipEntry("xl/_rels/workbook.xml.rels");
    zipout.putNextEntry(zipentry);
    data = xl_rels_workbook_xml_rels_xml.getBytes();
    zipout.write(data, 0, data.length);
    zipout.closeEntry();

    zipentry = new ZipEntry("xl/sharedStrings.xml");
    zipout.putNextEntry(zipentry);
    data = xl_sharedstrings_xml.getBytes();
    zipout.write(data, 0, data.length);
    zipout.closeEntry();

    zipentry = new ZipEntry("xl/styles.xml");
    zipout.putNextEntry(zipentry);
    data = xl_styles_xml.getBytes();
    zipout.write(data, 0, data.length);
    zipout.closeEntry();

    zipentry = new ZipEntry("xl/workbook.xml");
    zipout.putNextEntry(zipentry);
    data = xl_workbook_xml.getBytes();
    zipout.write(data, 0, data.length);
    zipout.closeEntry();

    // preparing the sheet data:

    String sheetdata = "<sheetData>";
    int r = 0;
    char c = 'A';
    --c;
    ArrayList<ArrayList<Object>> sheet = sheetDat;
    sheet.add(0, sheetKeys);
    for (ArrayList<Object> rowData : sheet) {
        sheetdata += "<row r=\"" + ++r + "\">";
        c = 'A';
        --c;
        for (Object cellData : rowData) {
            sheetdata += "<c r=\"" + Character.toString(++c) + r + "\"";
            if (cellData instanceof String && ((String) cellData).startsWith("=")) {
                sheetdata += "><f>" + ((String) cellData).replace("=", "") + "</f></c>";
            } else if (cellData instanceof String) {
                sheetdata += " t=\"inlineStr\"><is><t>" + cellData + "</t></is></c>";
            } else if (cellData instanceof Double) {
                sheetdata += "><v>" + cellData + "</v></c>";
            }
        }
        sheetdata += "</row>";
    }
    sheetdata += "</sheetData>";

    // get the static sheet xml into a buffer for further processing
    StringBuffer xl_worksheets_sheet1_xml_buffer = new StringBuffer(xl_worksheets_sheet1_xml);

    // get position of the <dimension ref=\"A1\"/> in the static xl_worksheets_sheet1_xml
    int dimensionstart = xl_worksheets_sheet1_xml_buffer.indexOf("<dimension ref=\"A1\"/>");
    // replace the <dimension ref=\"A1\"/> with the new dimension
    xl_worksheets_sheet1_xml_buffer = xl_worksheets_sheet1_xml_buffer.replace(
            dimensionstart,
            dimensionstart + "<dimension ref=\"A1\"/>".length(),
            "<dimension ref=\"A1:" + c + r + "\"/>");

    // get position of the <sheetData/> in the static xl_worksheets_sheet1_xml
    int sheetdatastart = xl_worksheets_sheet1_xml_buffer.indexOf("<sheetData/>");
    // replace the <sheetData/> with the prepared sheet date string
    xl_worksheets_sheet1_xml_buffer = xl_worksheets_sheet1_xml_buffer.replace(
            sheetdatastart,
            sheetdatastart + "<sheetData/>".length(),
            sheetdata);

    // create the xl/worksheets/sheet1.xml
    zipentry = new ZipEntry("xl/worksheets/sheet1.xml");
    zipout.putNextEntry(zipentry);
    data = xl_worksheets_sheet1_xml_buffer.toString().getBytes();
    zipout.write(data, 0, data.length);
    zipout.closeEntry();

    zipout.finish();

    // now ByteArrayOutputStream resultout contains the XLSX file data

    // writing this data into a file
    try (java.io.FileOutputStream fileout = new java.io.FileOutputStream("working.xlsx")) {
        resultout.writeTo(fileout);
        resultout.close();
    }

}
}

Answer 7

Axel Richter答案的更新：

动态添加单元格
无限列（不仅26个）

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class CreatePlainXLSX {

    //some static parts of the XLSX file:

    static String content_types_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><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\"/></Types>";

    static String docProps_app_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><Properties xmlns=\"http://schemas.openxmlformats.org/officeDocument/2006/extended-properties\"><Application>" + "Created Low level From Scratch" + "</Application></Properties>";

    static SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");

    static String docProps_core_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><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\">" + formatter.format(Calendar.getInstance().getTime()) /*java.time.Instant.now().truncatedTo(java.time.temporal.ChronoUnit.SECONDS).toString()*/ + "</dcterms:created><dc:creator>" + "Axel Richter from scratch" + "</dc:creator></cp:coreProperties>";

    static String _rels_rels_xml  = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><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>";

    static String xl_rels_workbook_xml_rels_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><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\"/></Relationships>";

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

    static String xl_styles_xml = "<?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>";

    static String xl_workbook_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><workbook xmlns=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\"><workbookPr date1904=\"false\"/><bookViews><workbookView activeTab=\"0\"/></bookViews><sheets><sheet name=\"" + "Sheet1" + "\" r:id=\"rId3\" sheetId=\"1\"/></sheets></workbook>";

    static String xl_worksheets_sheet1_xml = "<?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\"/><sheetData/><pageMargins bottom=\"0.75\" footer=\"0.3\" header=\"0.3\" left=\"0.7\" right=\"0.7\" top=\"0.75\"/></worksheet>";


    ArrayList<ArrayList<Object>> sheetDat = new ArrayList<>();

    public CreatePlainXLSX() {
        sheetDat.add(0, new ArrayList<>());
    }

    public void addCell(int rowNum, int cellNum, Object value) {

        if (sheetDat.size() <= rowNum){
            for (int a = sheetDat.size(); a <= rowNum; a++) {
                sheetDat.add(new ArrayList<>());
            }
        }

        if (sheetDat.get(rowNum).size() <= cellNum) {
            for (int a = sheetDat.get(rowNum).size(); a <= cellNum; a++) {
                sheetDat.get(rowNum).add("");
            }
        }
        sheetDat.get(rowNum).set(cellNum, value);
    }

    private static int toNumber(String name) {
        int number = 0;
        for (int i = 0; i < name.length(); i++) {
            number = number * 26 + (name.charAt(i) - ('A' - 1));
        }
        return number;
    }

    private static String toName(int number) {
        StringBuilder sb = new StringBuilder();
        while (number-- > 0) {
            sb.append((char)('A' + (number % 26)));
            number /= 26;
        }
        return sb.reverse().toString();
    }

    private String incrementColumnR(String a){
        return toName(toNumber(a) + 1);
    }

    public void exportToFile(FileOutputStream fileout) throws Exception {

        // result goes into a ByteArrayOutputStream
        ByteArrayOutputStream resultout = new ByteArrayOutputStream();

        // needed objects
        ZipEntry zipentry;
        byte[] data;

        // create ZipOutputStream
        ZipOutputStream zipout = new ZipOutputStream(resultout);

        // create the static parts of the XLSX ZIP file:

        zipentry = new ZipEntry("[Content_Types].xml");
        zipout.putNextEntry(zipentry);
        data = content_types_xml.getBytes();
        zipout.write(data, 0, data.length);
        zipout.closeEntry();

        zipentry = new ZipEntry("docProps/app.xml");
        zipout.putNextEntry(zipentry);
        data = docProps_app_xml.getBytes();
        zipout.write(data, 0, data.length);
        zipout.closeEntry();

        zipentry = new ZipEntry("docProps/core.xml");
        zipout.putNextEntry(zipentry);
        data = docProps_core_xml.getBytes();
        zipout.write(data, 0, data.length);
        zipout.closeEntry();

        zipentry = new ZipEntry("_rels/.rels");
        zipout.putNextEntry(zipentry);
        data = _rels_rels_xml.getBytes();
        zipout.write(data, 0, data.length);
        zipout.closeEntry();

        zipentry = new ZipEntry("xl/_rels/workbook.xml.rels");
        zipout.putNextEntry(zipentry);
        data = xl_rels_workbook_xml_rels_xml.getBytes();
        zipout.write(data, 0, data.length);
        zipout.closeEntry();

        zipentry = new ZipEntry("xl/sharedStrings.xml");
        zipout.putNextEntry(zipentry);
        data = xl_sharedstrings_xml.getBytes();
        zipout.write(data, 0, data.length);
        zipout.closeEntry();

        zipentry = new ZipEntry("xl/styles.xml");
        zipout.putNextEntry(zipentry);
        data = xl_styles_xml.getBytes();
        zipout.write(data, 0, data.length);
        zipout.closeEntry();

        zipentry = new ZipEntry("xl/workbook.xml");
        zipout.putNextEntry(zipentry);
        data = xl_workbook_xml.getBytes();
        zipout.write(data, 0, data.length);
        zipout.closeEntry();

        // preparing the sheet data:

        String sheetdata = "<sheetData>";
        int r = 0;
        String c = toName(0);
        ArrayList<ArrayList<Object>> sheet = sheetDat;
        for (ArrayList<Object> rowData : sheet) {
            sheetdata += "<row r=\"" + ++r + "\">";
            c = toName(0);
            for (Object cellData : rowData) {
                c = incrementColumnR(c);
                sheetdata += "<c r=\"" + c + r + "\"";
                if (cellData instanceof String && ((String) cellData).startsWith("=")) {
                    sheetdata += "><f>" + ((String) cellData).replace("=", "") + "</f></c>";
                } else if (cellData instanceof String) {
                    sheetdata += " t=\"inlineStr\"><is><t>" + cellData + "</t></is></c>";
                } else if (cellData instanceof Double || cellData instanceof Integer) {
                    sheetdata += "><v>" + cellData + "</v></c>";
                }
            }
            sheetdata += "</row>";
        }
        sheetdata += "</sheetData>";

        // get the static sheet xml into a buffer for further processing
        StringBuffer xl_worksheets_sheet1_xml_buffer = new StringBuffer(xl_worksheets_sheet1_xml);

        // get position of the <dimension ref=\"A1\"/> in the static xl_worksheets_sheet1_xml
        int dimensionstart = xl_worksheets_sheet1_xml_buffer.indexOf("<dimension ref=\"A1\"/>");
        // replace the <dimension ref=\"A1\"/> with the new dimension
        xl_worksheets_sheet1_xml_buffer = xl_worksheets_sheet1_xml_buffer.replace(
                dimensionstart,
                dimensionstart + "<dimension ref=\"A1\"/>".length(),
                "<dimension ref=\"A1:" + c + r + "\"/>");

        // get position of the <sheetData/> in the static xl_worksheets_sheet1_xml
        int sheetdatastart = xl_worksheets_sheet1_xml_buffer.indexOf("<sheetData/>");
        // replace the <sheetData/> with the prepared sheet date string
        xl_worksheets_sheet1_xml_buffer = xl_worksheets_sheet1_xml_buffer.replace(
                sheetdatastart,
                sheetdatastart + "<sheetData/>".length(),
                sheetdata);

        // create the xl/worksheets/sheet1.xml
        zipentry = new ZipEntry("xl/worksheets/sheet1.xml");
        zipout.putNextEntry(zipentry);
        data = xl_worksheets_sheet1_xml_buffer.toString().getBytes();
        zipout.write(data, 0, data.length);
        zipout.closeEntry();

        zipout.finish();

        // now ByteArrayOutputStream resultout contains the XLSX file data

        // writing this data into a file
        if(fileout != null) {
            resultout.writeTo(fileout);
            resultout.close();
        }
    }
}

Answer 8

xlsx是一个zip文件。因此，我们可以提取zip并获取内部的xml文件，然后我们可以自己解析它以获取工作表数据。

这对于xls和xlsx都适用。

如何创建和写入Excel文件（.xlsx）？

8 个答案: