java - JPanel 线程在主应用程序上的 jdbc 操作期间冻结

Question

当应用程序使用 jdbc 驱动程序进行一些数据库检查时，我有一个主 GUI 界面冻结。然后我的想法是启动一个线程，该线程将创建一个新的“加载”jpanel，以让用户了解应用程序正在执行的操作的状态。问题是这不起作用。加载 jpanel 卡住了。

您能否让我知道做我想做的事情的最佳方法或突出下面的问题？

非常感谢。这是我的课程：

导致应用程序冻结的主 GUI 上的方法：

private void snapshotOldVariables() {


    LoadingThread loadingThread = new LoadingThread();
    loadingThread.start();

    loadingThread.updateStatus("Creating snapshot of values...");

    // find selected inventory items on the main arraylist tableRows
    for (int i = 0; i < selectedItems.length; i++) {
        for (InventoryVO r : tableRows) {
            if (r.getMake().equals(selectedItems[i][0]) && r.getModel().equals(selectedItems[i][1]) && r.getSerial().equals(selectedItems[i][2])) {
                tableRowIndexes[i] = tableRows.indexOf(r);
            }
        }
    }

    for (int i = 0; i < selectedItems.length; i++) {
        productIds[i] = db.getAssetId(selectedItems[i][0], selectedItems[i][1]);
        oldLocationIds[i] = db.getLocationIdOfInventoryItem(productIds[i], selectedItems[i][2]);
        oldStatusIds[i] = db.getStatusId(tableRows.get(tableRowIndexes[i]).getStatus());
    }

    loadingThread.updateStatus("Complete");
    loadingThread.dispose();
}

加载线程：

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.app.main;

import com.app.panels.LoadingJPanel;
import java.awt.Dimension;
import javax.swing.JFrame;

/**
 *
 * @author myself
 */
public class LoadingThread extends Thread {

    JFrame loadingJFrame = null;
    LoadingJPanel loadingJPanel = null;

    @Override
    public void run() {

        loadingJFrame = new JFrame();
        loadingJPanel = new LoadingJPanel(loadingJFrame);

        Dimension d = new Dimension();
        d.setSize(500, 500);
        loadingJFrame.setResizable(false);
        loadingJFrame.setMinimumSize(d);
        loadingJFrame.setTitle("Loading...");
        loadingJFrame.setLocationRelativeTo(null);
        loadingJFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        loadingJFrame.add(loadingJPanel);
        loadingJFrame.setVisible(true);

    }

    public void updateStatus(String newStatus) {
        boolean tryUpdate = true;
        while (tryUpdate) {
            if (loadingJPanel != null) {
                loadingJPanel.updateStatus(newStatus);
                tryUpdate = false;
            }
        }
    }

    public void dispose() {
        boolean tryDispose = true;
        while (tryDispose) {
            if (loadingJFrame != null) {
                loadingJFrame.dispose();
                tryDispose = false;
            }
        }
    }

}

加载 JPanel：

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.app.panels;

import javax.swing.JFrame;

/**
 *
 * @author myself
 */
public class LoadingJPanel extends javax.swing.JPanel {

    public String currentStatus = "";

    /**
     * Creates new form LoadingJPanel
     */
    public LoadingJPanel(JFrame loadingJFrame) {
        initComponents();
    }

    public void updateStatus (String newStatus) {
        currentStatus += " Done\n" + newStatus;
        jTextAreaLoading.setText(currentStatus);
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextAreaLoading = new javax.swing.JTextArea();

        jLabel1.setText("Status");

        jTextAreaLoading.setEditable(false);
        jTextAreaLoading.setColumns(20);
        jTextAreaLoading.setRows(5);
        jScrollPane1.setViewportView(jTextAreaLoading);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addGap(0, 0, Short.MAX_VALUE))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
    }// </editor-fold>                        


    // Variables declaration - do not modify                     
    private javax.swing.JLabel jLabel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextAreaLoading;
    // End of variables declaration                   
}

标签： javamultithreadingswingjpanelevent-dispatch-thread