Question

在下面的代码中，我试图通过JXL api读取xls文件并执行任何必要的类，但转换为Workbook.getWorkbook（dbInputStream）时发生异常

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import android.content.Context;

public class ReadExcel {

    public static List<ChaveEloCoordenada> read(Context context) {
        List<ChaveEloCoordenada> list = new ArrayList<ChaveEloCoordenada>();
        try {
            InputStream dbInputStream = context.getAssets().open("file.xls", Context.MODE_WORLD_READABLE);

            int cols = 9;
            Cell[] row;

            Cell cell;

            Workbook w;

            ChaveEloCoordenada chave = null;

            w = Workbook.getWorkbook(dbInputStream);//error here

            Sheet sheet = w.getSheet(0);

            for (int r = 1; r < sheet.getRows(); r++) {
                chave = new ChaveEloCoordenada();
                row = sheet.getRow(r);
                if (row != null) {
                    for (int c = 0; c < cols; c++) {
                        cell = sheet.getCell(c, r);
                        if (cell != null) {
                            if (c == 0) {
                                chave.setBarramento(cell.getContents());
                            } else if (c == 1) {
                                chave.setCoordX(cell.getContents());
                            } else if (c == 2) {
                                chave.setCoordY(cell.getContents());
                            } else if (c == 3) {
                                chave.setPlaca(cell.getContents());
                            } else if (c == 4) {
                                chave.setTipo(cell.getContents());
                            } else if (c == 5) {
                                chave.setSe(cell.getContents());
                            } else if (c == 6) {
                                chave.setAlim(cell.getContents());
                            } else if (c == 7) {
                                chave.setElo(cell.getContents());
                            } else if (c == 8) {
                                chave.setTipoElo(cell.getContents());
                            }
                        }
                    }
                    list.add(chave);
                }
            }

        } catch (IOException e) {
            e.printStackTrace();
        } catch (BiffException e) {
            e.printStackTrace();
        }
        return list;
    }

}

知道如何解决这个问题吗？

谢谢！

修改

以下是例外

java.io.IOException
at android.content.res.AssetManager.readAsset(Native Method)
at android.content.res.AssetManager.access$700(AssetManager.java:36)
at android.content.res.AssetManager$AssetInputStream.read(AssetManager.java:571)
at jxl.read.biff.File.<init>(File.java:91)
at jxl.Workbook.getWorkbook(Workbook.java:268)
at jxl.Workbook.getWorkbook(Workbook.java:253)

如果我把上面的代码放在java项目中正常工作！

Answer 1

感谢所有试图帮助我的人！

问题是我试图读取的文件超出了android支持的大小。 excel文件有9.4 MB，似乎android文件在assets文件夹中只读取了1MB多一点。

所以解决方案我发现可能不是最好的，手动将数据从xls文件复制到txt文件，用gzip压缩这个文件，然后读取压缩文件然后读取txt文件，从而保存所有信息我数据库中需要（超过50,000条记录）！请遵循以下代码：

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
           scriptChaveEloCoordenada(db);        
    }

public void scriptChaveEloCoordenada(SQLiteDatabase db) {

        List<ChaveEloCoordenada> list = ReadExcel.read(context);

        for (ChaveEloCoordenada chave : list) {
            db.execSQL(insertChaveEloCoordenadas(chave.getBarramento(), chave.getCoordX(),chave.getCoordY(),chave.getPlaca(),
                                                 chave.getTipo(),chave.getSe(),chave.getAlim(),chave.getElo(),chave.getTipoElo()));
        }       

    }

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.GZIPInputStream;

import business.coordinate;
import android.content.Context;

    public class ReadExcel {

        public static List<ChaveEloCoordenada> read(Context context) {
            List<ChaveEloCoordenada> list = new ArrayList<ChaveEloCoordenada>();
            ChaveEloCoordenada chave = null;
            String line;
            int i = 0;
            String split[] = null;

            try {
                InputStream is = context.getAssets().open("file.zip");

                InputStream gzipStream = new GZIPInputStream(is);
                Reader decoder = new InputStreamReader(gzipStream, "UTF-8");
                BufferedReader buffered = new BufferedReader(decoder);

                while((line = buffered.readLine()) != null) {
                    i++;
                    chave = new ChaveEloCoordenada();
                    split = line.split("\t");
                    chave.setBarramento(split[0]);
                    chave.setCoordX(split[1]);
                    chave.setCoordY(split[2]);
                    chave.setPlaca(split[3]);
                    chave.setTipo(split[4]);
                    chave.setSe(split[5]);
                    chave.setAlim(split[6]);
                    if (split.length > 7 ) {
                        chave.setElo(split[7]);
                        chave.setTipoElo(split[8]);
                    }
                    list.add(chave);
                }
                buffered.close();
                System.out.println("TOTAL = " + i);
            }
            catch (final IOException ioe) {
                System.err.println("Unhandled exception:");
                ioe.printStackTrace();
                return list;
            }

            return list;
        }

    }

Answer 2

我不认为它是因为尺寸，行

w = Workbook.getWorkbook（dbInputStream）;

仅适用于File对象，而不适用于您要使用的InputStream对象

如何读取资产中的excel文件？

修改

2 个答案: