Question

您好，在尝试构建我的Java GUI时，我一直在解决我的JPanel不断调整大小的问题，或者它们只是显示为小的折叠方块。我使用setSize（）方法定义了每个JPanel的大小。

这就是我得到的

Output

这更像是我正在努力建立的

Mockup

这是我的代码。我想我的问题是如何阻止JPanels调整大小并坚持使用setSize（）方法定义的宽度。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import javaQuery.j2ee.GeoLocation;

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class iPerf extends JFrame implements ActionListener{

private static final int JFrame_W = 437;
private static final int JFrame_H = 586;
private static final int titlePanel_W = 437;
private static final int titlePanel_H = 46;
private static final int locationPanel_W = 437;
private static final int locationPanel_H = 46;
private static final int buttonPanel_W = 437;
private static final int buttonPanel_H = 47;
private static final int resultsPanel_W = 437;
private static final int resultsPanel_H = 444;
private static final int outputPanel_W = 371;
private static final int outputPanel_H = 172;
JPanel titlePanel = new JPanel();
JPanel locationPanel = new JPanel();
JPanel buttonPanel = new JPanel();
JPanel resultsPanel = new JPanel();
JPanel pingResultsPanel = new JPanel();
JPanel iperfResultsPanel = new JPanel();

JLabel iperfTitle = new JLabel("iPerf");
JLabel cityTitleLabel =  new JLabel("City");
JLabel cityResultLabel = new JLabel("");
JLabel countryTitleLabel =  new JLabel("Country");
JLabel countryResultLabel = new JLabel("");
JLabel latitudeTitleLabel =  new JLabel("Latitude");
JLabel latitudeResultLabel = new JLabel("");
JLabel longitudeTitleLabel =  new JLabel("Longitude");
JLabel longitudeResultLabel = new JLabel("");

JScrollPane pingResultsScrollPane = new JScrollPane();
JScrollPane iPerfResultsScrollPane = new JScrollPane();

String results;
JTextArea label = new JTextArea(results);

JButton runButton = new JButton("Run iPerf");

public static void main(String[] args){
    iPerf w = new iPerf( );
    w.setVisible(true);
    w.setResizable(false);
    w.setExtendedState(JFrame.MAXIMIZED_BOTH);

}

public iPerf() {
    super();
    setSize(JFrame_W, JFrame_H);
    setTitle("iPerf"); 
    setLayout(new  FlowLayout());
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Title Panel
    titlePanel.setSize(titlePanel_W, titlePanel_H);
    titlePanel.setBackground(Color.darkGray);
    titlePanel.add(iperfTitle);
    add(titlePanel);

    //Location Panel
    locationPanel.setSize(locationPanel_W, locationPanel_H);
    locationPanel.setBackground(Color.LIGHT_GRAY);
    locationPanel.setLayout(new GridLayout(2, 4));
    locationPanel.add(cityTitleLabel);
    locationPanel.add(countryTitleLabel);
    locationPanel.add(latitudeTitleLabel);
    locationPanel.add(longitudeTitleLabel);
    locationPanel.add(cityResultLabel);
    locationPanel.add(countryResultLabel);
    locationPanel.add(latitudeResultLabel);
    locationPanel.add(longitudeResultLabel);
    add(locationPanel);

    //Button Panel
    buttonPanel.setSize(buttonPanel_W, buttonPanel_H);
    buttonPanel.setBackground(Color.LIGHT_GRAY);
    buttonPanel.setLayout(new FlowLayout());
    runButton.addActionListener(this);
    buttonPanel.add(runButton);
    add(buttonPanel);

    //Results Panel
    resultsPanel.setSize(resultsPanel_W, resultsPanel_H);
    resultsPanel.setBackground(Color.darkGray);
    resultsPanel.setLayout(new FlowLayout());
    pingResultsPanel.setSize(outputPanel_W, outputPanel_H);
    pingResultsPanel.setBackground(Color.WHITE);
    pingResultsPanel.setLayout(new FlowLayout());
    iperfResultsPanel.setSize(outputPanel_W, outputPanel_H);
    iperfResultsPanel.setBackground(Color.WHITE);
    iperfResultsPanel.setLayout(new FlowLayout());
    iPerfResultsScrollPane.setViewportView(label);
    iperfResultsPanel.add(iPerfResultsScrollPane);

    resultsPanel.add(pingResultsPanel);
    resultsPanel.add(iperfResultsPanel);
    add(resultsPanel);

    }

public void actionPerformed(ActionEvent e) {
    String buttonString = e.getActionCommand();

    if (buttonString.equals("Run iPerf")) {
        System.out.println(buttonString + "it works!");

        runIperfEastTCP iperfEastTCPThread = new runIperfEastTCP();
        getLocation locationThread = new getLocation();
        runPing pingThread = new runPing();

        iperfEastTCPThread.start();
        locationThread.start();
        pingThread.start();
    }
}

private class runPing extends Thread {
    public void run() {
        try {
            String line;
            Process p = Runtime.getRuntime().exec("/sbin/ping -c 4 www.google.com");
            BufferedReader input = new BufferedReader(
                new InputStreamReader(p.getInputStream()));

            while ((line = input.readLine()) != null) {
                results += line + "\n";
                label.setText(results);
                System.out.println(line);
            }

            input.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

private class runIperfEastTCP extends Thread {
    public void run() {
        try {
            String line = "";
            Process p;

            p = Runtime.getRuntime().exec("/usr/local/bin/iperf -c 184.72.222.65 -p 5001 -w 64k -P 4 -i 1 -t 10 -f k");
            BufferedReader input = new BufferedReader(
                    new InputStreamReader(p.getInputStream()));

            while ((line = input.readLine()) != null) {
                results += line + "\n";
                label.setText(results);
                System.out.println(line);
            }

            input.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}


private class getLocation extends Thread {
    public void run() {
        try {
            InetAddress thisIP = InetAddress.getLocalHost();

            GeoLocation _gl = new GeoLocation();

            _gl.GetGeoLocation(thisIP);
            String IP = _gl.IP;
            String Country = _gl.Country;
            String City = _gl.City;
            String Latitude = _gl.Latitude;
            String Longitude = _gl.Longitude;

            cityResultLabel.setText(City);
            countryResultLabel.setText(Country);
            latitudeResultLabel.setText(Latitude);
            longitudeResultLabel.setText(Longitude);

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}


}

Answer 1

不要在任何组件上调用setSize(...)。
如果您确实需要设置尺寸，请考虑覆盖getPreferredSize()，但要谨慎使用非常。
您没有正确使用布局管理器。浏览布局管理器教程，因为它将解释并显示您需要知道的所有内容。
在将所有组件添加到JFrame之后，在将其设置为可见或定位之前，您需要在JFrame上调用pack()。

例如，你可以......

考虑将BoxLayout用于整体结构
顶部可以使用文本居中的JLabel。
JLabels和JButton的下一部分可以使用BorderLayout
BorderLayout可以保存在BorderLayout.CENTER位置保存四个标签/字段的JPanel，
同样的JPanel可以使用GridBagLayout。
持有JButton的JPanel可以使用FlowLayout，并且位于BorderLayout的BorderLayout.SOUTH或PAGE_END位置 - 使用JPanel。
下一个JPanel可以使用带边框和间隙的GridLayout。
等...

Answer 2

尝试使用另一个LayoutManager，例如GridLayout。

Jpanels不会显示为定义的大小

2 个答案: