Java Swing Making JTable Columns fill JScrollPane

Question

我制作了一个显示数据库的 GUI JTable。我有一个尺码问题。

我怎样才能让 JTable 的列填充 JScrollPane，但是如果一个 table 中有很多列，那么它只会保持它们的默认大小并让它们滚动.

基本上..

如果 SQL table 之一不填充 JTable 并且不需要滚动，那么我希望 JTable 的列变大以便它们适合。

如果 SQL JTable 确实需要滚动，那么我只想让它保持原样，所以它需要滚动。

这是我制作 JTable 的代码：

        JPanel panel1 = new JPanel();
        JTable table = new JTable(){
        private static final long serialVersionUID = 1L;

            @Override
                public boolean isCellEditable(int row, int column) {
                   return false;
                }

        };
        JScrollPane stable = new JScrollPane (table);
        stable.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        stable.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        panel1.add(stable);

Answer 1

在您的代码中注释以下行：

table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);

这使得 table 列伸展以填充滚动窗格的宽度

拉伸列以适应 table 的整个宽度使其看起来很难看。相反，我建议将以下功能添加到您的 table。

http://www.jroller.com/santhosh/entry/jtable_becomes_uglier_with_auto http://www.jroller.com/santhosh/entry/packing_jtable_columns

这让你的 jtable 看起来更专业

Answer 2

import java.awt.Dimension;
import java.awt.Font;
import javax.swing.table.*;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class StatusPage extends JPanel
{
    static DefaultTableModel dm;
    JTable table;
    JScrollPane jsp_table;
    static Connection conn;
    static Statement stmt;
    static ResultSet rs;

    public StatusPage(Connection c)
    {
        conn = c;
        String col_name[] = {"S.No.","Book Name","Author Name","ISBN","Available Book","Issue Book","Total Book"};
        dm = new DefaultTableModel(null,col_name);
        table = new JTable(dm);
        table.getTableHeader().setFont( new Font( "Goudy Old Style" , Font.BOLD, 15 ));
                table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
                table.getColumnModel().getColumn(0).setPreferredWidth(50);
                table.getColumnModel().getColumn(1).setPreferredWidth(175);
                table.getColumnModel().getColumn(2).setPreferredWidth(175);
                table.getColumnModel().getColumn(3).setPreferredWidth(125);
                table.getColumnModel().getColumn(4).setPreferredWidth(111);
                table.getColumnModel().getColumn(5).setPreferredWidth(90);
                table.getColumnModel().getColumn(6).setPreferredWidth(90);
        jsp_table = new JScrollPane(table);
        jsp_table.setPreferredSize(new Dimension(850, 520));
        addRowTable();
        add(jsp_table);
    }
    public static void addRowTable()
    {
        try
        {
                    int a = dm.getRowCount();
            int i=0;
            while(i<a)
            {
                dm.removeRow(0);
                i++;
            }

            stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
            rs = stmt.executeQuery("SELECT * FROM BOOK_TABLE");

            int count = 1;
            while(rs.next())
            {
                String s[] = new String[7];

                s[0] = ""+count;
                s[1] = rs.getString(6);
                s[2] = rs.getString(1);
                s[3] = rs.getString(2);
                s[4] = ""+rs.getInt(4);
                s[5] = ""+rs.getInt(5);
                s[6] = ""+rs.getInt(3);

                count++;

                dm.addRow(s);
            }
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
    }
}

阅读此代码并更改您的代码因为此代码有效

Answer 3

要在 table 使用新模型更新后调用以下方法来准确获取您要求的内容：

public static void tweakColumns(JTable table){
    Enumeration<TableColumn> columns = table.getColumnModel().getColumns();

    int required = 0;
    while(columns.hasMoreElements()){
        TableColumn column = columns.nextElement();
        int width = (int)table.getTableHeader().getDefaultRenderer()
                    .getTableCellRendererComponent(table, column.getIdentifier()
                            , false, false, -1, column.getModelIndex()).getPreferredSize().getWidth();
        required += width;
    }

    JViewport viewport = (JViewport)SwingUtilities.getAncestorOfClass(JViewport.class, table);
    int viewportWidth = viewport.getWidth();
    table.setAutoResizeMode(required<viewportWidth ? JTable.AUTO_RESIZE_ALL_COLUMNS : JTable.AUTO_RESIZE_OFF);
}

Java Swing Making JTable Columns fill JScrollPane

Java Swing Making JTable Columns fill JScrollPane

java

swing

jtable

jscrollpane