重写文本框JTextField添加图标

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public class HFDoubleTextField extends JTextField {           private static final long serialVersionUID = -2213492965585762616L;     private ImageIcon icon;           public HFDoubleTextField(int columns) {         super(columns);         //获取当前路径下的图片         icon = new ImageIcon(Resources.class.getResource("double.png"));         Insets insets = new Insets(2, 20, 2, 16);         //设置文本输入距左边20         this.setMargin(insets);     }           public HFDoubleTextField() {         super();         //获取当前路径下的图片         icon = new ImageIcon(Resources.class.getResource("double.png"));         Insets insets = new Insets(2, 20, 2, 16);         //设置文本输入距左边20         this.setMargin(insets);     }           @Override     public void paintComponent(Graphics g) {         Insets insets = getInsets();         super.paintComponent(g);         int iconWidth = icon.getIconWidth();         int iconHeight = icon.getIconHeight();         int Height = this.getHeight();         //在文本框中画上之前图片         icon.paintIcon(this, g, (insets.left - iconWidth)/2, (Height - iconHeight) / 2);     } }

　　效果：

注意事项：

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1	Insets insets = new Insets(0, 20, 0, 0); 如果你只这样插入内边距的话，<br>会导致的你的文本框上下比正常文本框要矮，但是要更框。<br><br>以为正常文本框的的边距是2，<br>所有要设成

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1	Insets insets = new Insets(2, 20, 2, -16);