如何检索“来自其他文件的用户输入”以在JAVA中将其显示为表格？

Question

下面是显示表格的代码示例，但是当我想要从其他文件的用户输入中检索信息时，该如何完成呢？

package components;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class SimpleTableDemo extends JPanel {
    private boolean DEBUG = false;

    public SimpleTableDemo() {
        super(new GridLayout(1,0));

        String[] columnNames = {"First Name",
                                "Last Name",
                                "Sport",
                                "# of Years",
                                "Vegetarian"};

如何从其他文件中检索信息，而不是手动输入每个信息？

        **Object[][] data = {
        {"Kathy", "Smith", "Snowboarding", new Integer(5), new Boolean(false)},
        {"John", "Doe","Rowing", new Integer(3), new Boolean(true)},
        {"Sue", "Black","Knitting", new Integer(2), new Boolean(false)},
        {"Jane", "White","Speed reading", new Integer(20), new Boolean(true)},
        {"Joe", "Brown","Pool", new Integer(10), new Boolean(false)} };**

        final JTable table = new JTable(data, columnNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);

        if (DEBUG) {
            table.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    printDebugData(table);
                }
            });
        }

        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);

        //Add the scroll pane to this panel.
        add(scrollPane);
    }

    private void printDebugData(JTable table) {
        int numRows = table.getRowCount();
        int numCols = table.getColumnCount();
        javax.swing.table.TableModel model = table.getModel();

        System.out.println("Value of data: ");
        for (int i=0; i < numRows; i++) {
            System.out.print("    row " + i + ":");
            for (int j=0; j < numCols; j++) {
                System.out.print("  " + model.getValueAt(i, j));
            }
            System.out.println();
        }
        System.out.println("--------------------------");
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("SimpleTableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        SimpleTableDemo newContentPane = new SimpleTableDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

Answer 1

您可以将有关用户的信息写入csv(逗号分隔值)格式的文件中，然后使用OpenCSV解析该文件并构造用于显示的矩阵或数组。

Answer 2

因此，基本上您的问题是如何将文件的内容检索到对象中

假设您的文件包含行，这些行如下所示：

Kathy,Smith,Snowboarding,5,false
John,Doe,Rowing,3,true

这是一个CSV文件。要阅读CSV文件，你最好的选择是下载扫描仪，但是，如果你仍然想自己做这件事，并且你的数据在一个名为"data.csv“的文件中，我会使用扫描仪。另外，假设您不了解ArrayLists之类的东西，这里有一些代码可以帮助您上手。

Scanner s = new Scanner(new File("data.csv"));
int count = 0;
while (s.hasNext())
   count++;
// now count has the number of lines in the file and you know 
// there are 5 attributes.
Object[][] data = new Object[count][5]
Scanner s1 = new Scanner(new File("data.csv"));
count = 0;
while(s1.hasNext()){
   String[] fields = s1.next().split(",");
   data[count][0] = field[0];
   data[count][1] = fields[1];
   data[count][2] = fields[2];
   data[count][3] = new Integer(Integer.parseInt(fields[3]));
   data[count][4] = new Boolean(fields[4].equals("true");
   count++;   
}

最后，当心一个indexOutOfBounds错误，如果你在开头、行间或结尾处留空一行(即文件的最后一行是空的)，可能会发生这个错误。