Java Swing：JTextArea列问题

Question

How do I put the text in specific columns with jTextArea? 如何使用jTextArea将文本放在特定的列中？

        private javax.swing.JTextArea jTextArea1;
        jTextArea1.setColumns(4);
        jTextArea1.insert(price, 0);    //column 1
        jTextArea1.insert(cost, 0);    //column 2
        jTextArea1.insert(quantity, 0);       //column etc..
        jTextArea1.insert(itemName, 0);
        jTextArea1.insert("\n", 0);

Answer 1

There are situations when the (mighty) JTable is too much. 在某些情况下，（强大的）JTable太多了。

If you just want a JLabel/ JTextArea like component with some columns use a HTML-Table in a JTextPane or in a JEditorPane: 如果您只想要类似JLabel / JTextArea的组件并带有一些列，请在JTextPane或JEditorPane中使用HTML-Table：

在此处输入图片说明

import java.awt.Font;
import javax.swing.JDialog;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.text.html.HTMLDocument;

public class ColumnsInJTextPane
{

  public ColumnsInJTextPane()
  {
    double price = 124.75;
    int quantity = 3;
    String itemName = " iPad";

    JTextPane t = new JTextPane();
    t.setContentType( "text/html" );

    StringBuilder text = new StringBuilder( 150 );
    text.append( "<html><body>" );
    text.append( "<table border='0' style='margin:4px 2px 12px 6px' width='100%'>" );

    text.append( "<tr>" + "<td width='30' align='left' valign='top' style='margin-right:8px'>" );
    text.append( price );
    text.append( "</td>" );

    text.append( "<td align='left' valign='top' style='margin-right:8px'>" );
    text.append( itemName );
    text.append( "</td>" );

    text.append( "<td width='20' align='left' valign='top' style='margin-right:8px'>" );
    text.append( quantity );
    text.append( "</td>" + "</tr>" );

    text.append( "<tr>" + "<td>" );
    text.append( price * 4 );
    text.append( "</td>" );

    text.append( "<td>" );
    text.append( (((Boolean) itemName.equals( itemName )).toString().concat( itemName )) );
    text.append( "</td>" );

    text.append( "<td>" );
    text.append( quantity / 2 );
    text.append( "</td>" + "</tr>" );

    text.append( "</table>" );
    text.append( "</body></html>" );

    t.setText( text.toString() );

    //to get a consistent (body) appearance use the font from the Label using a CSS rule (instead of the value in javax.swing.text.html.default.css)
    Font font = UIManager.getFont( "Label.font" );
    String bodyRule =
    "body { font-family: " + font.getFamily() + "; " + "font-size: " + font.getSize() + "pt; }";
    ((HTMLDocument) t.getDocument()).getStyleSheet().addRule( bodyRule );

    JDialog d = new JDialog();
    d.add( t );
    d.pack();
    d.setVisible( true );
  }

  public static void main( String[] args )
  {
    new ColumnsInJTextPane();
  }

}

There are some tweaks and tricks in this example which demonstrate how evil HTML really is ;-) 此示例中有一些调整和技巧，它们证明了HTML到底是多么邪恶；-)

the trimming of spaces is utilized 利用空间的修剪
the second column is growing/ shrinking with the JDialog size because of the omitted width in its td-Tag 第二列随着JDialog大小的增长/缩小，因为其td-Tag中省略了宽度
css margins have been thrown in for no special reason css的边距无特殊原因被抛出
for a consistent appearance the font of the JLabel has to be fetched from the UIManager and set via CSS 为了获得一致的外观，必须从UIManager中获取JLabel的字体并通过CSS进行设置
if you reduce the width of the JDialog the text in the second column is nicely word-wrapped 如果减小JDialog的宽度，则第二列中的文字会自动换行
(ooh, wait! this is a nice feature of HTML) （哦，等等！这是HTML的一个不错的功能）

Answer 2

列指的是一个字符，因此，如果columns = 4，则表示宽度为4个字符。

Answer 3

The best approach is to use a JTable. 最好的方法是使用JTable。

But if you really want to use a text cmponent you can use a JTextPane and play with tabs. 但是，如果您真的想使用文本cmponent，则可以使用JTextPane并使用选项卡播放。 See my example in JTextPane Tab Size . 请参阅“ JTextPane选项卡大小”中的示例。

Answer 4

Your code is inserting your text at the same position ! 您的代码在同一位置插入文本！ Replace 0 by whatever column you want the text to be at. 将0替换为您希望文本位于的任何列。 And see the result 并查看结果

EDIT: 编辑：

Column size means amount of characters, not words. 列大小是指字符数，而不是单词数。 As commented, have a look at JTable 如前所述，看看JTable

Java Swing：JTextArea列问题

问题描述

4 个解决方案

解决方案1
3 2010-06-08 13:51:11

解决方案2
1 2010-06-05 21:59:06

解决方案3
1 已采纳 2010-06-05 22:34:29

解决方案4
0 2010-06-05 21:58:12

Java Swing：JTextArea列问题

问题描述

4 个解决方案

解决方案1 3 2010-06-08 13:51:11

解决方案2 1 2010-06-05 21:59:06

解决方案3 1 已采纳 2010-06-05 22:34:29

解决方案4 0 2010-06-05 21:58:12

解决方案1
3 2010-06-08 13:51:11

解决方案2
1 2010-06-05 21:59:06

解决方案3
1 已采纳 2010-06-05 22:34:29

解决方案4
0 2010-06-05 21:58:12