由 SpringLayout 类实现的布局管理器称为弹簧布局管理器。利用该布局管理器管理组件，当改变窗体的大小时，能够在不改变组件间相对位置的前提下自动调整组件大小，使组件依旧布满整个窗体，从而保证了窗体的整体效果。下面，通过一个实例来看看弹簧布局管理器的使用方法和效果。
弹簧布局管理器以容器和组件的边缘为操作对象，通过为组件和容器边缘以及组件和组件边缘建立约束，实现对组件布局的管理。通过方法 putConstraint(String e1,Conponet c1,int pad,String e2,Componet c2)可以为各边之间建立约束，该方法的入口参数说明如下：
c1：需要参考的组件对象；
c2：需要参考的组件对象的具体需要参考的边；
e1：被参考的组件对象；
e2：被参考的组件对象的具体被参考的边；
pad：两条边之间的距离，即两个组件之间的间距。
有点绕，其实很好理解。
实例1：使用弹簧布局管理器。
本实例利用弹簧布局管理器实现窗体，在调整窗体的大小后，组件仍会布满整个窗体，并且组件间的相对位置并不会改变。源码：
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import java.awt.Container;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.Spring;import javax.swing.SpringLayout;public class SpringLayout_3 extends JFrame { private static final long serialVersionUID = -6045918631932051025L; public SpringLayout_3() { // TODO Auto-generated constructor stub Container container = getContentPane(); SpringLayout springLayout = new SpringLayout(); container.setLayout(springLayout); JLabel topicLabel = new JLabel("主题 :"); JLabel contentLabel = new JLabel("内容 :"); final JTextField textField = new JTextField(30); JTextArea textArea = new JTextArea(3, 30); JScrollPane scrollPane = new JScrollPane(); scrollPane.setViewportView(textArea); textArea.setLineWrap(true); final JButton confirmButton = new JButton("取消"); JButton cancelButton = new JButton("确认"); Spring st = Spring.constant(10); Spring st2 = Spring.constant(30); container.add(topicLabel); springLayout.putConstraint(SpringLayout.NORTH, topicLabel, st, SpringLayout.NORTH, container); springLayout.putConstraint(SpringLayout.WEST, topicLabel, st, SpringLayout.WEST, container); container.add(textField); springLayout.putConstraint(SpringLayout.WEST, textField, st2, SpringLayout.EAST, topicLabel); springLayout.putConstraint(SpringLayout.NORTH, textField, 0, SpringLayout.NORTH, topicLabel); springLayout.putConstraint(SpringLayout.EAST, textField, Spring.minus(st), SpringLayout.EAST, container); container.add(contentLabel); springLayout.putConstraint(SpringLayout.WEST, contentLabel, 0, SpringLayout.WEST, topicLabel); springLayout.putConstraint(SpringLayout.NORTH, contentLabel, st, SpringLayout.SOUTH, topicLabel); container.add(scrollPane); springLayout.putConstraint(SpringLayout.NORTH, scrollPane, 0, SpringLayout.NORTH, contentLabel); springLayout.putConstraint(SpringLayout.WEST, scrollPane, 0, SpringLayout.WEST, textField); springLayout.putConstraint(SpringLayout.EAST, scrollPane, Spring.minus(st), SpringLayout.EAST, container); container.add(confirmButton); springLayout.putConstraint(SpringLayout.SOUTH, scrollPane, Spring.minus(st), SpringLayout.NORTH, confirmButton); springLayout.putConstraint(SpringLayout.EAST, confirmButton, Spring.minus(st), SpringLayout.EAST, container); springLayout.putConstraint(SpringLayout.SOUTH, confirmButton, Spring.minus(st), SpringLayout.SOUTH, container); container.add(cancelButton); springLayout.putConstraint(SpringLayout.EAST, cancelButton, Spring.minus(st), SpringLayout.WEST, confirmButton); springLayout.putConstraint(SpringLayout.NORTH, cancelButton, 0, SpringLayout.NORTH, confirmButton); // make the text field focused every time the window is activated addWindowFocusListener(new WindowAdapter() { @Override public void windowGainedFocus(WindowEvent e) { // TODO Auto-generated method stub textField.requestFocus(); } }); } public static void main(String[] args) { // TODO Auto-generated method stub SpringLayout_3 frame = new SpringLayout_3(); frame.setTitle("使用弹簧布局管理器"); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setBounds(100, 100, 600, 300); }} |
总结
以上就是弹簧布局管理器的使用方法及实例，喜欢的同学快去试试效果吧。
感谢大家对服务器之家的支持！
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