java - 如何设置要读入 GUI 中文本字段的某些文本？

Question

我正在使用二进制 IO 和事件处理进行作业。看起来像这样，我想我已经掌握了大部分基本代码，现在开始讨论困难的事情了。如何将 .bin 文件中的文本读取到单独的文本字段中？

我的字段当前是空白的，但是当读入时，它们应该看起来像这样，并且我应该能够使用底部的两个按钮来解析单独的信息集。

这是我到目前为止所拥有的。我有一个 RecordViewerUI JFrame 表单、一个 RecordViewerPanel JFrame 面板和一个 SalesAgent java 类，该类包含四个变量的所有 getter 和 setter/构造函数。

这是我的面板。对生成的代码感到抱歉。预先感谢任何人可以提供的任何帮助。

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;

public class RecordViewerPanel extends javax.swing.JPanel {

String filename = "sales.bin";
ArrayList<SalesAgent> customer = new ArrayList<>();
int curIndex = 0;

/**
 * Creates new form RecordViewerPanel
 */
public RecordViewerPanel() throws IOException, ClassNotFoundException {
    initComponents();
    try {
        ObjectInputStream in = new ObjectInputStream(
                new BufferedInputStream(
                new FileInputStream(filename)));
        ArrayList<SalesAgent> salesForce = new ArrayList<SalesAgent>();
        String first = in.readUTF();
        String last = in.readUTF();
        double sales = in.readDouble();
        Date date = (Date) (in.readObject());
    } catch (FileNotFoundException ex) {
        Logger.getLogger(RecordViewerPanel.class.getName()).log(Level.SEVERE, null, ex);
    }

}

private void refreshUI() {
    SalesAgent sale = (customer.get(curIndex));
    firstTextField.setText(sale.getFirst());
    lastTextField.setText(sale.getLast());
    salesTextField.setText("$" + String.valueOf(sale.getSales()));
    dateTextField.setText(String.valueOf(sale.getDate()));
    recordPanel.repaint();
}

/**
 * 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() {

    filePanel = new javax.swing.JPanel();
    fileLabel = new javax.swing.JLabel();
    fileLabel1 = new javax.swing.JLabel();
    recordPanel = new javax.swing.JPanel();
    firstTextField = new javax.swing.JTextField();
    lastTextField = new javax.swing.JTextField();
    salesTextField = new javax.swing.JTextField();
    dateTextField = new javax.swing.JTextField();
    jLabel1 = new javax.swing.JLabel();
    previousButton = new javax.swing.JButton();
    nextButton = new javax.swing.JButton();

    filePanel.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));

    fileLabel.setBackground(new java.awt.Color(204, 204, 204));
    fileLabel.setText("sales.bin");

    fileLabel1.setBackground(new java.awt.Color(204, 204, 204));
    fileLabel1.setText("Current file:");

    javax.swing.GroupLayout filePanelLayout = new javax.swing.GroupLayout(filePanel);
    filePanel.setLayout(filePanelLayout);
    filePanelLayout.setHorizontalGroup(
        filePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(filePanelLayout.createSequentialGroup()
            .addGap(94, 94, 94)
            .addComponent(fileLabel)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        .addGroup(filePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(filePanelLayout.createSequentialGroup()
                .addGap(20, 20, 20)
                .addComponent(fileLabel1)
                .addContainerGap(562, Short.MAX_VALUE)))
    );
    filePanelLayout.setVerticalGroup(
        filePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(filePanelLayout.createSequentialGroup()
            .addContainerGap()
            .addComponent(fileLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 30, Short.MAX_VALUE)
            .addContainerGap())
        .addGroup(filePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(filePanelLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(fileLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 30, Short.MAX_VALUE)
                .addContainerGap()))
    );

    recordPanel.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));

    firstTextField.setText("jTextField1");

    lastTextField.setText("jTextField1");

    salesTextField.setText("jTextField1");

    dateTextField.setText("jTextField1");

    jLabel1.setText("First                             Last                             Sales                            Date");

    previousButton.setText("<<");
    previousButton.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            previousButtonActionPerformed(evt);
        }
    });

    nextButton.setText(">>");
    nextButton.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            nextButtonActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout recordPanelLayout = new javax.swing.GroupLayout(recordPanel);
    recordPanel.setLayout(recordPanelLayout);
    recordPanelLayout.setHorizontalGroup(
        recordPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(recordPanelLayout.createSequentialGroup()
            .addContainerGap()
            .addGroup(recordPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(recordPanelLayout.createSequentialGroup()
                    .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 415, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(0, 203, Short.MAX_VALUE))
                .addGroup(recordPanelLayout.createSequentialGroup()
                    .addComponent(firstTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 91, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(18, 18, 18)
                    .addComponent(lastTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 91, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(18, 18, 18)
                    .addComponent(salesTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 91, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(18, 18, 18)
                    .addComponent(dateTextField)))
            .addContainerGap())
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, recordPanelLayout.createSequentialGroup()
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addComponent(previousButton, javax.swing.GroupLayout.PREFERRED_SIZE, 53, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(nextButton, javax.swing.GroupLayout.PREFERRED_SIZE, 53, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(31, 31, 31))
    );
    recordPanelLayout.setVerticalGroup(
        recordPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(recordPanelLayout.createSequentialGroup()
            .addGap(29, 29, 29)
            .addComponent(jLabel1)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addGroup(recordPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(firstTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(lastTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(salesTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(dateTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 35, Short.MAX_VALUE)
            .addGroup(recordPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(previousButton)
                .addComponent(nextButton))
            .addGap(27, 27, 27))
    );

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

private void previousButtonActionPerformed(java.awt.event.ActionEvent evt) {                                               
    if (curIndex > 0) {
        curIndex--;
    } else if (curIndex == 0) {
        curIndex = 4;
    }
    customer.get(curIndex);
}                                              

private void nextButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
    if (curIndex < 4) {
        curIndex++;
    } else if (curIndex == 4) {
        curIndex = 0;
    }
    customer.get(curIndex);
}                                          
// Variables declaration - do not modify                     
private javax.swing.JTextField dateTextField;
private javax.swing.JLabel fileLabel;
private javax.swing.JLabel fileLabel1;
private javax.swing.JPanel filePanel;
private javax.swing.JTextField firstTextField;
private javax.swing.JLabel jLabel1;
private javax.swing.JTextField lastTextField;
private javax.swing.JButton nextButton;
private javax.swing.JButton previousButton;
private javax.swing.JPanel recordPanel;
private javax.swing.JTextField salesTextField;
// End of variables declaration                   
}

Answer 1

这个问题很难回答，因为我不了解文件格式或 Customer 类，但基本上，您需要从您从文件中读取的值，将其添加到 customer List 并调用 refreshUI

try {
    ObjectInputStream in = new ObjectInputStream(
            new BufferedInputStream(
            new FileInputStream(filename)));
    String first = in.readUTF();
    String last = in.readUTF();
    double sales = in.readDouble();
    Date date = (Date) (in.readObject());
    Customer cust = ...;
    customer.add(cust);
} catch (FileNotFoundException ex) {
    Logger.getLogger(RecordViewerPanel.class.getName()).log(Level.SEVERE, null, ex);
}
refreshUI();