Java弹簧布局管理器使用方法详解

        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：

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。

感谢大家对的支持！