我正在使用此答案中的代码来提供日志记录功能,并且效果很好!谢谢古斯塔夫。
我想使用这种方法并添加函数: writeEntry(String, String) 来写入我希望可以从 swing 访问的 ArrayList;即,单击“显示”并让它将此单词对列表写入 JText 元素。
因此在 gustafc 的代码中添加了一些内容。
界面:
package com.example.logging;
public interface SimpleActivityLogger {
void logAction(String message);
void writeEntry(String s1); //*** I added this ***
}
根据 gustafc 的示例将其传递给另一个类:
public class SimpleComponentLogger implements SimpleActivityLogger{
private JTextComponent target;
private ArrayList data;
public SimpleComponentLogger(JTextComponent target, ArrayList data){
this.target = target;
this.data = data;
}
public void logAction(final String message){
SwingUtilities.invokeLater(new Runnable(){
public void run(){
target.setText(String.format("%s%s%n", new Object[]{target.getText(), message}));
}
});
}
public void writeEntry(String s1){
data.add(s1);
System.out.println("data array length: " + data.size());
}
}
然后进行实施:
// this originally extended NotesThread,
// but I assume you won't have that on your system
public class LookupIterator3 extends Thread {
private SimpleActivityLogger logger;
// Constructor that passes logger instance
public LookupIterator3(SimpleActivityLogger logger){
this.logger = logger;
}
public void doLookup(){
this.start();
}
public void run() {
String[] words = {"the", "quick", "smart", "fox", "jumps", "over", "the", "lazy", "dog"};
for(int i=0; i<words.length; i++){
synchronized(words){
try{
logger.logAction(words[i]);
words.wait(500);
}
catch(InterruptedException ie){ie.printStackTrace();}
}
logger.writeEntry(words[i]);
}
}
}
但是,当我尝试从 swing 访问 ArrayList 时,它返回 size()=0。这是一个很大的摆动,但你应该可以复制和粘贴它:
public class MySwingTest extends JFrame {
private static final long serialVersionUID = 1L;
private JTextField filename = new JTextField();
private JTextField dir = new JTextField();
private JTextPane output, answersPane;
private JScrollPane scroller;
private SimpleComponentLogger logger;
private ArrayList answer;
public MySwingTest() {
JMenu fileMenu;
JMenuBar menuBar;
JMenuItem menuOpen, menuExit;
JButton answerButton = new JButton("show answers");
answerButton.addActionListener(new MyListener());
menuBar = new JMenuBar();
fileMenu = new JMenu("File");
menuBar.add(fileMenu);
menuOpen = new JMenuItem("open file");
menuExit = new JMenuItem("exit");
answer = new ArrayList();
output = new JTextPane();
logger = new SimpleComponentLogger(output, answer);
scroller = new JScrollPane(output, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
output.setEditable(false);
answer = new ArrayList();
answersPane = new JTextPane();
answersPane.setSize(100, 200);
answersPane.setEditable(false);
fileMenu.add(menuOpen);
fileMenu.add(menuExit);
menuOpen.addActionListener(new MyListener());
menuExit.addActionListener(new MyListener());
JPanel p = new JPanel();
p.setLayout(new GridLayout(2, 1));
p.add(filename);
p.add(dir);
Container cp = getContentPane();
cp.add(menuBar,BorderLayout.NORTH);
cp.add(p);
cp.add(scroller, BorderLayout.CENTER);
cp.add(answersPane, BorderLayout.WEST);
cp.add(answerButton, BorderLayout.SOUTH);
dir.setEditable(false);
filename.setEditable(false);
}
// Inner class listener
class MyListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
String eventCommand = e.getActionCommand();
if(eventCommand.equals("exit")){
System.exit(0);
}
if(eventCommand.equals("show answers")){
String entry = (String)answer.get(0);
answersPane.setText(entry);
}
else {
LookupIterator3 lu3 = new LookupIterator3(logger);
lu3.doLookup();
}
}
}
public static void main(String[] args) {
run(new MySwingTest(), 450, 600);
}
public static void run(JFrame frame, int width, int height) {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(width, height);
frame.setVisible(true);
}
}
很抱歉这个问题很长,但这让我很头疼!有什么建议么?(我知道我会因为写一个长的 qn 而变得衣衫褴褛,但我不知道我可以遗漏什么)
好的。长篇编辑完成。打开那个婴儿并从菜单中选择“打开文件”。它将在没有文件选择器的情况下运行。