SpringLayout没有正确分隔

问题描述：

我正在使用Spring Layout为我正在构建的应用程序设计一个gui。我有一个弹簧布局的问题;该组件没有特别的消息框然后之间的正确间隔，并且如看到的画面中的发送键：SpringLayout没有正确分隔

Spring Layout Issue

这里是应用程序的代码：声明优选

package com.cliff777.chat; 

import java.awt.Container; 
import java.awt.Dimension; 

import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JTextArea; 
import javax.swing.JTextField; 
import javax.swing.SpringLayout; 

public class ChatMain 
{ 
final int WIDTH = 800; 
final int HEIGHT = 600; 

JTextField messageBox = new JTextField(); //write a message in 
JTextArea chatBox = new JTextArea(); //displays the messages 
JButton sendButton = new JButton("Send"); 

void setupGui(Container container) 
{ 
    container.setPreferredSize(new Dimension(WIDTH, HEIGHT)); 

    SpringLayout layout = new SpringLayout(); 
    container.setLayout(layout); 

    container.add(messageBox); 
    container.add(chatBox); 
    container.add(sendButton); 


    layout.putConstraint(SpringLayout.NORTH, chatBox, 5, SpringLayout.NORTH, container); 
    layout.putConstraint(SpringLayout.WEST, chatBox, 5, SpringLayout.WEST, container); 
    layout.putConstraint(SpringLayout.EAST, chatBox, 5, SpringLayout.EAST, container); 
    layout.putConstraint(SpringLayout.SOUTH, chatBox, 5, SpringLayout.NORTH, messageBox); 
    layout.putConstraint(SpringLayout.SOUTH, chatBox, 5, SpringLayout.NORTH, sendButton); 

    layout.putConstraint(SpringLayout.WEST, messageBox, 5, SpringLayout.WEST, container); 
    layout.putConstraint(SpringLayout.SOUTH, messageBox, 5, SpringLayout.SOUTH, container); 
    layout.putConstraint(SpringLayout.EAST, messageBox, 5, SpringLayout.WEST, sendButton); 

    layout.putConstraint(SpringLayout.EAST, sendButton, 5, SpringLayout.EAST, container); 
    layout.putConstraint(SpringLayout.SOUTH, sendButton, 5, SpringLayout.SOUTH, container); 



    //container.add(messageBox); 
    //container.add(chatBox); 
    //container.add(sendButton); 


} 

public ChatMain() 
{ 
    JFrame frame = new JFrame("Chat"); 

    setupGui(frame.getContentPane()); 

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.pack(); 
    frame.setVisible(true); 

    chatBox.setEditable(false); 

    while(true) 
    { 
     chatBox.setText(chatBox.getText() + messageBox.getText()); 
     messageBox.setText(""); 

     try 
     { 
      Thread.sleep(5000); 
     } 
     catch (Exception e) 
     { 

     } 
    } 

} 

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

答

大小container.setPreferredSize(new Dimension(WIDTH, HEIGHT));不会自动意味着布局知道容器的宽度和高度。其实布局知道他们（宽度和高度），但它也想知道如何在窗口大小调整。 SpringLayout喜欢忽略大小，并且每次都可以做到。
下面的约束可能是你需要的那些：

// set the borders of chatBox 
layout.putConstraint(SpringLayout.NORTH, chatBox, 5, SpringLayout.NORTH, container); 
layout.putConstraint(SpringLayout.WEST, chatBox, 5, SpringLayout.WEST, container); 
layout.putConstraint(SpringLayout.EAST, chatBox, 5, SpringLayout.EAST, container); 

// set the borders of messageBox 
layout.putConstraint(SpringLayout.NORTH, messageBox, 5, SpringLayout.SOUTH, chatBox); 
layout.putConstraint(SpringLayout.WEST, messageBox, 5, SpringLayout.WEST, container); 

// set the borders of sendButton 
layout.putConstraint(SpringLayout.NORTH, sendButton, 5, SpringLayout.SOUTH, chatBox); 
layout.putConstraint(SpringLayout.WEST, sendButton, 5, SpringLayout.EAST, messageBox); 

// the most importent part set the borders of container (you need only bottom-right) 
layout.putConstraint(SpringLayout.EAST, container, 5, SpringLayout.EAST, sendButton); 
layout.putConstraint(SpringLayout.SOUTH, container, 5, SpringLayout.SOUTH, sendButton);

在程序中的主要问题是不适合的容器，因此奇怪的重叠，边界清晰。

对于更复杂的任务，您可以查看GridBagLayout的方向。

SpringLayout没有正确分隔

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