小编Jdm*_*699的帖子

我试图运行此代码:

public class ExcelSimpleTest {
    public static void main(String[] args) throws  Exception {
          File f = new File("C:\\Users\\yaron\\Desktop\\Test.xlsx");
          FileInputStream fis = new FileInputStream(f);

          XSSFWorkbook wb=new XSSFWorkbook(fis);
          Sheet sheet=wb.getSheetAt(0);
          System.out.println(sheet.getRow(0).getCell(0).getStringCellValue());
    }

}

我收到这个错误:

    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/collections4/ListValuedMap
    at src.ExcelSimpleTest.main(ExcelSimpleTest.java:22)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections4.ListValuedMap
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 1 more

我检查了互联网并复制了Apache POI文件,并不明白我的问题是什么.

当我运行这个简短的程序时,我不断收到堆栈溢出错误!请帮忙!现在它应该做的就是获取用户输入并打印它们的位置(在X和Y坐标中).我不确定Stack溢出错误是什么或如何解决它.

import java.awt.*;
import javax.swing.*;

public class ExplorerPanel extends JFrame {

    ExplorerEvent prog = new ExplorerEvent(this);

    JTextArea dataa = new JTextArea(15, 20);
    JTextField datain = new JTextField(20);
    JButton submit = new JButton("Submit");
    JTextField errors = new JTextField(30);

    public ExplorerPanel() {
        super("Explorer RPG");
        setLookAndFeel();
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_…
        BorderLayout bord = new BorderLayout();
        setLayout(bord);

        JPanel toppanel = new JPanel();
        toppanel.add(dataa);
        add(toppanel, BorderLayout.NORTH);

        JPanel middlepanel = new JPanel();
        middlepanel.add(datain);
        middlepanel.add(submit);
        add(middlepanel, BorderLayout.CENTER);

        JPanel bottompanel = new JPanel(); 
        bottompanel.add(errors);
        add(bottompanel, BorderLayout.SOUTH);

        dataa.setEditable(false);
        errors.setEditable(false);

        submit.addActionListener(prog); …