从java中读取excel文件时出错

Question

我正在 Android Studio 中制作一个应用程序，我很新。 当我运行我的应用程序时，它崩溃了。 我的目标是从 excel 文档中读取单元格。 Excel 文档在资产中。 已尝试转换为 xls 文件和 xlsx 文件。 无法找到有关此错误或如何修复它的任何帮助。 这是错误：

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.pedikalk, PID: 10587
    java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/commons/math3/util/ArithmeticUtils;
        at org.apache.poi.poifs.property.RootProperty.setSize(RootProperty.java:59)
        at org.apache.poi.poifs.property.DirectoryProperty.<init>(DirectoryProperty.java:52)
        at org.apache.poi.poifs.property.RootProperty.<init>(RootProperty.java:31)
        at org.apache.poi.poifs.property.PropertyTable.<init>(PropertyTable.java:58)
        at org.apache.poi.poifs.filesystem.POIFSFileSystem.<init>(POIFSFileSystem.java:102)
        at org.apache.poi.poifs.filesystem.POIFSFileSystem.<init>(POIFSFileSystem.java:274)
        at com.example.pedikalk.Scanner.readExcelFileFromAssets(Scanner.java:40)
        at com.example.pedikalk.Scanner.<init>(Scanner.java:26)
        at com.example.pedikalk.MainActivity.onCreate(MainActivity.java:47)
        at android.app.Activity.performCreate(Activity.java:8000)
        at android.app.Activity.performCreate(Activity.java:7984)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

这是我的代码：

import android.content.res.AssetManager;
import android.util.Log;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;

import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

public class Scanner{

    IOException FileNotFoundException = new IOException();
    AssetManager assetManager;

    public Scanner(AssetManager asset) throws IOException {

        this.assetManager = asset;
        readExcelFileFromAssets();
    }

    public void readExcelFileFromAssets() { //:)

        try {
            // Creating Input Stream
            /*
             * File file = new File( filename); FileInputStream myInput = new
             * FileInputStream(file);
             */
            InputStream myInput= assetManager.open("Pedikalk matrise.xlsx");

            // Create a POIFSFileSystem object
            POIFSFileSystem myFileSystem = new POIFSFileSystem(myInput); //This is the line blamed for the error

            // Create a workbook using the File System
            HSSFWorkbook myWorkBook = new HSSFWorkbook(myFileSystem);

            // Get the first sheet from workbook
            HSSFSheet mySheet = myWorkBook.getSheetAt(0);

            // We now need something to iterate through the cells.
            Iterator<Row> rowIter = mySheet.rowIterator();
            while (rowIter.hasNext()) {
                HSSFRow myRow = (HSSFRow) rowIter.next();
                Iterator<Cell> cellIter = myRow.cellIterator();
                while (cellIter.hasNext()) {
                    HSSFCell myCell = (HSSFCell) cellIter.next();
                    System.out.println(myCell.toString());
                    Log.e("FileUtils", "Cell Value: " + myCell.toString()+ " Index :" +myCell.getColumnIndex());
                    // Toast.makeText(getApplicationContext(), "cell Value: " +
                    // myCell.toString(), Toast.LENGTH_SHORT).show();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return;
    }

任何人都可以帮忙吗？

Answer 1

java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/commons/math3/util/ArithmeticUtils;

JVM 无法找到ArithmeticUtils 。 你可以从 Apache Commons Math 中得到它。

如果您使用的是 maven，您可以将此依赖项添加到您的pom.xml文件中

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-math3</artifactId>
    <version>3.0</version>
</dependency>

对于其他依赖管理器，请参阅https://mvnrepository.com/artifact/org.apache.commons/commons-math3/3.0