Java+Swing: 新增页面和进行数据添加 整理13

1. 新增界面代码

这是比较简单的，就是有多个组件搭建的，就不细说了，不明白的可以参考之前的文章

首先是要给添加按钮添加点击事件的，然后就会弹出添加页面（这里需要继承JDialog），直接上添加页面的代码

public class AddStudentView extends JDialog {
    // 声明一系列组件
    JPanel jPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 10, 20));
    JLabel nameLabel = new JLabel("姓名", JLabel.RIGHT); // 第二个参数表示水平的排列方式
    JTextField nameTextField = new JTextField();
    JLabel noLabel = new JLabel("学号", JLabel.RIGHT);
    JTextField noTextField = new JTextField();
    JLabel homeLabel =  new JLabel("家乡", JLabel.RIGHT);
    JTextField homeTextField = new JTextField();
    JLabel chineseLabel = new JLabel("语文成绩", JLabel.RIGHT);
    JTextField chineseTextField = new JTextField();
    JLabel mathLabel = new JLabel("数学成绩", JLabel.RIGHT);
    JTextField mathTextField = new JTextField();
    JLabel englishLabel = new JLabel("英语成绩", JLabel.RIGHT);
    JTextField englishTextField = new JTextField();

    JButton addBtn = new JButton("添加");

    public AddStudentView(MainView mainView) {
        super(mainView, "添加学生信息",true);

        addStudentViewHandler = new AddStudentViewHandler(this, mainView);

        // 添加各组件到面板上
        nameLabel.setPreferredSize(new Dimension(80, 30));
        jPanel.add(nameLabel);
        nameTextField.setPreferredSize(new Dimension(200, 30));
        jPanel.add(nameTextField);

        noLabel.setPreferredSize(new Dimension(80, 30));
        jPanel.add(noLabel);
        noTextField.setPreferredSize(new Dimension(200, 30));
        jPanel.add(noTextField);

        homeLabel.setPreferredSize(new Dimension(80, 30));
        jPanel.add(homeLabel);
        homeTextField.setPreferredSize(new Dimension(200, 30));
        jPanel.add(homeTextField);

        chineseLabel.setPreferredSize(new Dimension(80, 30));
        jPanel.add(chineseLabel);
        chineseTextField.setPreferredSize(new Dimension(200, 30));
        jPanel.add(chineseTextField);

        mathLabel.setPreferredSize(new Dimension(80, 30));
        jPanel.add(mathLabel);
        mathTextField.setPreferredSize(new Dimension(200, 30));
        jPanel.add(mathTextField);

        englishLabel.setPreferredSize(new Dimension(80, 30));
        jPanel.add(englishLabel);
        englishTextField.setPreferredSize(new Dimension(200, 30));
        jPanel.add(englishTextField);

        jPanel.add(addBtn);

        addBtn.addActionListener(addStudentViewHandler);


        Container contentPane = getContentPane();
        contentPane.add(jPanel);

        setSize(350, 500);
        setLocationRelativeTo(null);
        // DISPOSE_ON_CLOSE  只销毁当前窗体
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setResizable(false);
        setVisible(true);
    }
}

2. 实现数据的添加功能

2.1 首先给按钮添加点击事件

点击按钮时会触发addStudentViewHandler中的actionPerformed方法

addBtn.addActionListener(addStudentViewHandler);

?在AddStudentView中实例化事件处理类对象，并将整个窗体this和mainView作为参数传过去，这边需要mainView，主要就是在数据添加成功后，需要调用mainView的reloadTable方法，重新加载表格。

AddStudentViewHandler addStudentViewHandler;
addStudentViewHandler = new AddStudentViewHandler(this, mainView);

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2.2 AddStudentViewHandler类

先搭个框架，具体的添加方法还没写

package com.handler;

import com.entity.Student;
import com.service.Impl.StudentServiceImpl;
import com.student_view.AddStudentView;
import com.student_view.MainView;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * @Author：xiexu
 * @Date：2023/12/16 22:01
 */
public class AddStudentViewHandler implements ActionListener {
    private AddStudentView addStudentView;
    private MainView mainView;
    public AddStudentViewHandler(AddStudentView addStudentView, MainView mainView){
        this.addStudentView = addStudentView;
        this.mainView = mainView;
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        JButton jButton = (JButton) e.getSource();
        String text = jButton.getText();

        if ("添加".equals(text)) {

            ......

            if () {
                // 重新加载表格查到最新数据
                mainView.reloadTable();
                addStudentView.dispose();

            } else {
                // 添加错误，给出提示
                JOptionPane.showMessageDialog(addStudentView, "添加失败");
            }

        }
    }
}

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2.3 封装添加的内容

首先获取表单中的内容，然后封装成一个对象

    public Student builStudent() {
        Student student = new Student();
        student.setName(nameTextField.getText());
        student.setNo(noTextField.getText());
        student.setHomeTown(homeTextField.getText());
        student.setChinese(Double.parseDouble(chineseTextField.getText()));
        student.setMath(Double.parseDouble(mathTextField.getText()));
        student.setEnglish(Double.parseDouble(englishTextField.getText()));
        return student;
    }

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2.4 StudentService接口?

 boolean add(Student student);

2.5 StudentServiceImpl实现类?

    @Override
    public boolean add(Student student) {
        StringBuilder sql = new StringBuilder();
        sql.append("insert into detail(name,no,homeTown,chinese,math,english)");
        sql.append("values(?,?,?,?,?,?)");

        // 执行
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        TableDTO tableDTO = new TableDTO(); // 返回的数据
        try {
            connection = DBUtil.getConnection();
            preparedStatement = connection.prepareStatement(sql.toString());
            preparedStatement.setString(1, student.getName());
            preparedStatement.setString(2, student.getNo());
            preparedStatement.setString(3, student.getHomeTown());
            preparedStatement.setDouble(4, student.getChinese());
            preparedStatement.setDouble(5, student.getMath());
            preparedStatement.setDouble(6, student.getEnglish());

            return preparedStatement.executeUpdate() == 1;  // 执行查询返回结果集
        }catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBUtil.closeRS(resultSet);
            DBUtil.closePS(preparedStatement);
            DBUtil.closeConnection(connection);
        }

        return false;
    }

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2.6 补充前面没写的代码

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