设置JPanel中固定的JTextField的大小 [英] Set the size of JTextField fixed in a JPanel

问题描述

对于学校，我正在使用Java GUI程序来存储一些管理数据.

for school I am working on a Java GUI program to store some administrative data.

现在，我想使用JTextField将来自数据库(mysql)的事件数据显示到JPanel中， 我的问题是我无法固定JTextField的大小，因为它总是占据很多位置(参见图片)

Now I want to display eventdata from my DB (mysql) into a JPanel with use of a JTextField, my problem is I can't get the size of the JTextField fixed as it always takes up a lot of place (see picture)

图片: http://postimg.org/image/5pcklo5n1/

这是我的代码，有人提示吗? (我是Java新手):

Here's my code, anyone some tips? (I am new to java):

public void editEvent() {
    JFrame frEventEdit = new JFrame ("Event Edit Menu");
    frEventEdit.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frEventEdit.setVisible(true);   
    frEventEdit.setSize(700, 500);


    //JPanel for displaying data
    JPanel pnData = new JPanel();
    pnData.setLayout(new BoxLayout(pnData, BoxLayout.PAGE_AXIS));
    pnData.add(Box.createRigidArea(new Dimension(0,5)));
    pnData.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
    pnData.setAutoscrolls(true);

    Statement stmt;
    try {
        stmt = mySql.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT name, date, time, type, address, representative FROM events " ) ;
        while (rs.next() == true){
            System.out.println(rs.getString("name")+"  "+rs.getString("date")+"  "+rs.getString("time")+"  "+rs.getString("type")+"  "+rs.getString("address")+"  "+rs.getString("representative"));
            final JTextField txtEventList = new JTextField(rs.getString("name")+"  "+rs.getString("date")+"  "+rs.getString("time")+"  "+rs.getString("type")+"  "+rs.getString("address")+"  "+rs.getString("representative"));
            pnData.add(txtEventList, BorderLayout.CENTER);
        }

    } catch (SQLException e) {
        e.printStackTrace();
    }

    JScrollPane scroller = new JScrollPane(pnData);
    frEventEdit.add(scroller);
    frEventEdit.setLocationRelativeTo(null); 

}

预先感谢

推荐答案

1. 发生这种情况是因为您使用BoxLayout，请尝试使用FlowLayout，这是JPanel或其他默认值.
2. 在下一个语句pnData.add(txtEventList, BorderLayout.CENTER);中，BorderLayout.CENTER不起作用，因为您没有在面板上使用BorderLayout.
3. 要固定JTextField的大小，请使用构造函数 JTextField(int cols).
4. 根据您的目的，使用@AndrewThompson建议的JTable. 表格指南.

5. 在构建结束或下一步类似时呼叫frEventEdit.setVisible(true);:

1. It happens because you use BoxLayout,try to use FlowLayout which is default for JPanel or another.
2. In next statement pnData.add(txtEventList, BorderLayout.CENTER); , BorderLayout.CENTER doesn't work, because you doesn't use BorderLayout for your panel.
3. For fixing size of JTextField, use constructor JTextField(int cols).
4. For your purposes use JTable as recommended by @AndrewThompson. Tutorial for table.

5. call frEventEdit.setVisible(true); at the end of construction or like next:

SwingUtilities.invokeLater(new Runnable() {

    @Override
    public void run() {
        frEventEdit.setVisible(true);
    }
});

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