我有2节课。一个班是gui，另一个班是一些人。
第二类包括Swingworker。它搜索一些日志文件并从那里取一些句子。同样在gui中有一个标签写在Searching.. Please wait..中，当第二个类完成工作时，应该更改为Searching is finished..。
此标签名称为searchLabel并在头等舱中定义。这是私人变量。
我的目的是：在第二课中有done方法。在这个方法里面，我想做searchLabel.setText("blabla");
我该怎么做？我无法访问。公开的JLabel也不是我认为的解决方案。
您可以通过搜索/* PROBLEM IS IN HERE */此字符串轻松地在代码中找到该部分。
以下是代码
这是我的gui课程：
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
public class mainGui extends JFrame {
private JPanel contentPane;
private JTextField userNametextField;
public static JLabel searchLabel,userNameWarningLabel,pathWarningLabel;
/**
* Launch the application.
*/
public static void main(String[] args) {
try {
for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (Exception e) {
// If Nimbus is not available, you can set the GUI to another look and feel.
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
mainGui frame = new mainGui();
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
int w = frame.getSize().width;
int h = frame.getSize().height;
int x = (dim.width-w)/4;
int y = (dim.height-h)/2;
frame.setLocation(x, y);
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public mainGui() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 550, 455);
contentPane = new JPanel();
getContentPane().setLayout(null);
setTitle("Role Finding Script");
// Border border;
JLabel lblUsername = new JLabel(" Username :");
lblUsername.setFont(new Font("LucidaSans", Font.BOLD, 13));
lblUsername.setBounds(10, 53, 113, 30);
//Border border = BorderFactory.createRaisedSoftBevelBorder();
// border = BorderFactory.createEtchedBorder();
// lblUsername.setBorder(border);
getContentPane().add(lblUsername);
userNametextField = new JTextField();
userNametextField.setBounds(146, 53, 250, 30);
userNametextField.setFont(new Font("LucidaSans", Font.PLAIN, 13));
getContentPane().add(userNametextField);
userNametextField.setColumns(20);
JLabel lblRole = new JLabel(" Roles :");
lblRole.setFont(new Font("LucidaSans", Font.BOLD, 13));
lblRole.setBounds(10, 124, 113, 30);
// border = BorderFactory.createEtchedBorder();
// lblRole.setBorder(border);
getContentPane().add(lblRole);
JComboBox<String> comboBox = new JComboBox<String>();
comboBox.setBounds(146, 124, 250, 30);
comboBox.addItem("VR_ANALYST1");
comboBox.addItem("VR_ANALYST2");
comboBox.addItem("VR_ANALYST3");
comboBox.addItem("VR_ANALYST4");
comboBox.addItem("VR_ANALYST5");
comboBox.addItem("VR_ANALYST6");
comboBox.addItem("VR_ANALYST7");
comboBox.addItem("VR_ANALYST8");
comboBox.addItem("VR_ANALYST9");
comboBox.addItem("VR_ANALYST10");
comboBox.addItem("VR_ANALYST11");
comboBox.addItem("VR_ANALYST12");
comboBox.setMaximumRowCount(6);
getContentPane().add(comboBox);
this.searchLabel = new JLabel("Searching.. Please wait..");
searchLabel.setFont(new Font("LucidaSans", Font.BOLD, 13));
searchLabel.setBounds(169, 325, 195, 30);
searchLabel.setVisible(false);
getContentPane().add(searchLabel);
JButton btnNewButton = new JButton("Show Me ");
btnNewButton.setFont(new Font("LucidaSans", Font.BOLD, 13));
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(userNametextField.getText() == null || userNametextField.getText().equals("")){
userNameWarningLabel.setText("Please filled in the Username part.");
}else{
searchLabel.setVisible(true);
VolvoMain task = new VolvoMain();
task.execute();
}
}
});
btnNewButton.setBounds(188, 271, 126, 30);
getContentPane().add(btnNewButton);
JLabel lblPath = new JLabel(" Path :");
lblPath.setFont(new Font("Dialog", Font.BOLD, 13));
lblPath.setBounds(10, 195, 113, 30);
getContentPane().add(lblPath);
userNameWarningLabel = new JLabel("");
userNameWarningLabel.setBounds(156, 89, 227, 14);
userNameWarningLabel.setFont(new Font("Dialog", Font.ITALIC, 10));
userNameWarningLabel.setForeground(Color.red);
getContentPane().add(userNameWarningLabel);
JButton btnNewButton_1 = new JButton("...");
btnNewButton_1.setBounds(412, 195, 30, 30);
getContentPane().add(btnNewButton_1);
JButton btnNewButton_2 = new JButton("+");
btnNewButton_2.setBounds(460, 195, 44, 30);
getContentPane().add(btnNewButton_2);
JLabel headerLabel = new JLabel("Find the Role");
headerLabel.setFont(new Font("Tahoma", Font.BOLD, 15));
headerLabel.setHorizontalAlignment(SwingConstants.CENTER);
headerLabel.setBounds(94, 11, 358, 30);
headerLabel.setForeground(Color.red);
getContentPane().add(headerLabel);
pathWarningLabel = new JLabel("");
pathWarningLabel.setForeground(Color.RED);
pathWarningLabel.setFont(new Font("Dialog", Font.ITALIC, 10));
pathWarningLabel.setBounds(156, 236, 227, 14);
getContentPane().add(pathWarningLabel);
}
}
这是另一个班级：
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import javax.swing.SwingWorker;
public class VolvoMain extends SwingWorker{
private FileInputStream fstream;
private BufferedReader br;
private String username = "HALAA";
private String role = "VR_ANALYST";
private String firstLine = "";
private Pattern regex;
private List<String> stringList = new ArrayList<String>();
private File dir;
private mainGui mg = new mainGui();
//String reg = "\\t'AUR +(" + username + ") .*? /ROLE=\"(" + role + ")\".*$";
@SuppressWarnings("unchecked")
@Override
protected Object doInBackground() throws Exception {
String fmt = "\\t'AUR +(%s) .*? /ROLE=\"(%s)\".*$";
String reg = String.format(fmt, username, role);
regex = Pattern.compile(reg);
dir = new File(
"C:"+File.separator+"Documents and Settings"+File.separator+"sbx1807"+File.separator+"Desktop"+File.separator
+"Batu"+File.separator+"Deneme"+File.separator
);
File[] dirs = dir.listFiles();
String[] txtArray = new String[dirs.length];
int z=0;
for (File file : dirs) {
if (file.isDirectory()) {
}else {
if(file.getAbsolutePath().endsWith(".log")){
txtArray[z] = file.getAbsolutePath();
System.out.println(file.getAbsolutePath());
z++;
}
}
int j = 0;
for(int i=0; i<txtArray.length; i++){
if(txtArray[i] != null && !txtArray[i].equals("")){
try{
fstream = new FileInputStream(txtArray[i]);
br = new BufferedReader(new InputStreamReader(fstream));
String strLine;
while ((strLine = br.readLine()) != null) {
/* parse strLine to obtain what you want */
if((j%2)== 0){
firstLine = strLine;
}
if(((j%2) != 0) && regex.matcher(strLine).matches()){
stringList.add(firstLine);
stringList.add(strLine);
}
publish(stringList.size());
j++;
}
publish(stringList.size());
br.close();
} catch (Exception e) {
System.err.println("Error: " + e.getMessage());
}
}
}
for(int k=0; k<stringList.size(); k++){
System.out.println(stringList.get(k));
}
}
return null;
}
@Override
public void done() {
System.out.println("bitti");
// getSearchJLabel().setText("Searching is done..");
// mainGui m = new mainGui();
// m.searchLabel.setText("done");
}
}
答案 0 :(得分：1)
调整VolvoMain类，使其在构造函数中引用JLabel。将其存储在private final字段中，您可以在done()方法中使用它。
public class VolvoMain extends SwingWorker{
// ...
private final JLabel labelToUpdate;
public VolvoMain(JLabel labelToUpdate) {
this.labelToUpdate = labelToUpdate;
}
// ...
@Override
public void done() {
// Update labelToUpdate here
}
将在Event Dispatch Thread上调用done()方法，因此可以安全地直接调整标签文本。