• 【JAVA】-- 简易超市管理系统窗口（四）（实现思路+每步代码）

    前面已经完成了“增加内容”的功能，下面将要完成“删除内容”功能。

    删除内容就是销售商品，点击添加货物，选择货物，设置好价格数量和经办人即可销售。

     一、为“增加内容”、“删除内容”按钮增加点击事件实现切换

    创建Shan类

    主类增加

    构建Shan类方法实例化对象，并设置唯一标识。

    private Shan shanPanel = null;

    1. private Shan getShan(){
    2.         if(shanPanel == null){
    3.             shanPanel = new Shan();
    4.             shanPanel.setName("shanPanel");
    5.         }
    6.         return shanPanel;
    7.     }

    getMainPanel方法增加

     mainPanel.add(getShan(),getShan().getName());

    getZengButton方法增加/修改

    actionPerformed是监听操作的接口，如按钮按下、文本框输入回车等操作，

    当按钮按下时，创建CardLayout卡片布局对象，使用show方法将面板显示，实现切换效果。

    1.  public void actionPerformed(ActionEvent e) {
    2.                     CardLayout layout = (CardLayout) mainPanel.getLayout();
    3.                     layout.show(getMainPanel(),"zengPanel");
    4.                 }

    getShanButton方法增加/修改

    1.  public void actionPerformed(ActionEvent e) {
    2.                     CardLayout layout = (CardLayout)mainPanel.getLayout();
    3.                     layout.show(getMainPanel(),"shanPanel");
    4.  
    5.                 }

    二、设置分割框

    设置界面分割框，分为左面板和右面板，左面板为网格包布局，右为边框布局。

    Shan类增加

    1.  public Shan(){
    2.         super();
    3.         this.setSize(352,302);
    4.         this.setOpaque(false);//设置面板透明
    5.         this.setLayout(new BorderLayout());//使用边框布局
    6.         JSplitPane hSplitPane = new JSplitPane();//设置一个分割框
    7.         hSplitPane.setOpaque(false);
    8.         JPanel leftPanel = new JPanel();
    9.         leftPanel.setOpaque(false);
    10.         leftPanel.setLayout(new GridBagLayout());//网格包布局
    11.         JPanel rightPanel = new JPanel();
    12.         rightPanel.setOpaque(false);
    13.         rightPanel.setLayout(new BorderLayout());
    14.         hSplitPane.setLeftComponent(leftPanel);
    15.         hSplitPane.setRightComponent(rightPanel);
    16.         hSplitPane.setOneTouchExpandable(true);//快速隐藏显示
    17.         hSplitPane.setDividerLocation(350);//设置分割条的位置
    18.         this.add(hSplitPane,BorderLayout.CENTER);
    19.     }

    三、增加“销售记录”标签

    Shan类增加

    public JLabel label1;//销售记录

     构造方法增加

    1. GridBagConstraints gridBagConstraints1 = new GridBagConstraints();
    2.         gridBagConstraints1.gridx = 0;
    3.         gridBagConstraints1.gridy = 0;
    4.         gridBagConstraints1.insets = new Insets(5,5,0,0);
    5.         label1 = new JLabel("销售记录");
    6.         label1.setFont(new Font("华文行楷",Font.BOLD,20));
    7.         label1.setHorizontalAlignment(SwingConstants.CENTER);
    8.         label1.setHorizontalTextPosition(SwingConstants.CENTER);
    9.         label1.setVerticalAlignment(SwingConstants.CENTER);
    10.         label1.setVerticalTextPosition(SwingConstants.CENTER);
    11.         leftPanel.add(label1,gridBagConstraints1);

    四、增加“添加货物”按钮

    Shan类增加

    构造方法增加

    1.  GridBagConstraints gridBagConstraints2 = new GridBagConstraints();
    2.         gridBagConstraints2.gridx = 1;
    3.         gridBagConstraints2.gridy = 0;
    4.         gridBagConstraints2.insets = new Insets(5,0,0,5);
    5.         gridBagConstraints2.weightx = 1.0;
    6.         gridBagConstraints2.fill = GridBagConstraints.HORIZONTAL;
    7.         button1 = new JButton("添加货物");
    8.         button1.setFont(new Font("华文行楷",Font.BOLD,20));
    9.         button1.setOpaque(false);
    10.         button1.setBorderPainted(false);
    11.         button1.setContentAreaFilled(false);
    12.         button1.setFocusPainted(false);
    13.         leftPanel.add(button1,gridBagConstraints2);

    五、增加下拉框功能

    Shan类增加

        public JComboBox box1;//下拉框

    构造方法增加

    1. GridBagConstraints gridBagConstraints3 = new GridBagConstraints();
    2.         gridBagConstraints3.gridx = 0;
    3.         gridBagConstraints3.gridy = 1;
    4.         gridBagConstraints3.insets = new Insets(0,5,5,5);
    5.         gridBagConstraints3.gridwidth = 2;
    6.         gridBagConstraints3.weightx = 1.0;
    7.         gridBagConstraints3.fill = GridBagConstraints.HORIZONTAL;
    8.         box1 = new JComboBox();
    9.         leftPanel.add(box1,gridBagConstraints3);

    六、增加标签与输入框

    Shan类增加

    1.  public JLabel label2;
    2.     public JTextField field2;
    3.     public JLabel label3;
    4.     public JTextField field3;
    5.     public JLabel label4;
    6.     public JTextField field4;
    7.     public JLabel label5;
    8.     public JTextField field5;
    9.     public JLabel label6;
    10.     public JTextField field6;
    11.     public JLabel label7;
    12.     public JTextField field7;
    13.     public JLabel label8;
    14.     public JTextField field8;
    15.     public JLabel label9;
    16.     public JTextField field9;

    构造方法增加

    1.  GridBagConstraints gridBagConstraints4 = new GridBagConstraints();
    2.         gridBagConstraints4.gridx = 0;
    3.         gridBagConstraints4.gridy = 2;
    4.         gridBagConstraints4.insets = new Insets(0,5,0,0);
    5.         label2 = new JLabel("商品名称");
    6.         leftPanel.add(label2,gridBagConstraints4);
    7.         GridBagConstraints gridBagConstraints5 = new GridBagConstraints();
    8.         gridBagConstraints5.gridx = 1;
    9.         gridBagConstraints5.gridy = 2;
    10.         gridBagConstraints5.insets = new Insets(0,0,0,5);
    11.         gridBagConstraints5.weightx = 1.0;
    12.         gridBagConstraints5.fill = GridBagConstraints.HORIZONTAL;
    13.         field2 = new JTextField();
    14.         leftPanel.add(field2,gridBagConstraints5);
    15.  
    16.         GridBagConstraints gridBagConstraints6 = new GridBagConstraints();
    17.         gridBagConstraints6.gridx = 0;
    18.         gridBagConstraints6.gridy = 3;
    19.         gridBagConstraints6.insets = new Insets( 0,5,0,0);
    20.         label3 = new JLabel("商品厂家");
    21.         leftPanel.add(label3,gridBagConstraints6);
    22.         GridBagConstraints gridBagConstraints7 = new GridBagConstraints();
    23.         gridBagConstraints7.gridx = 1;
    24.         gridBagConstraints7.gridy = 3;
    25.         gridBagConstraints7.insets = new Insets(0,0,0,5);
    26.         gridBagConstraints7.weightx = 1.0;
    27.         gridBagConstraints7.fill = GridBagConstraints.HORIZONTAL;
    28.         field3 = new JTextField();
    29.         leftPanel.add(field3,gridBagConstraints7);
    30.  
    31.         GridBagConstraints gridBagConstraints8= new GridBagConstraints();
    32.         gridBagConstraints8.gridx=0;
    33.         gridBagConstraints8.gridy=4;
    34.         gridBagConstraints8.insets=new Insets(0, 5, 0, 0);
    35.         label4=new JLabel("商品价格");
    36.         leftPanel.add(label4, gridBagConstraints8);
    37.         GridBagConstraints gridBagConstraints9= new GridBagConstraints();
    38.         gridBagConstraints9.gridx=1;
    39.         gridBagConstraints9.gridy=4;
    40.         gridBagConstraints9.insets=new Insets(0, 0, 0, 5);
    41.         gridBagConstraints9.weightx=1.0;
    42.         gridBagConstraints9.fill=GridBagConstraints.HORIZONTAL;
    43.         field4=new JTextField();
    44.         leftPanel.add(field4, gridBagConstraints9);
    45.  
    46.         GridBagConstraints gridBagConstraints10= new GridBagConstraints();
    47.         gridBagConstraints10.gridx=0;
    48.         gridBagConstraints10.gridy=5;
    49.         gridBagConstraints10.insets=new Insets(0, 5, 0, 0);
    50.         label5=new JLabel("销售数量");
    51.         leftPanel.add(label5, gridBagConstraints10);
    52.         GridBagConstraints gridBagConstraints11= new GridBagConstraints();
    53.         gridBagConstraints11.gridx=1;
    54.         gridBagConstraints11.gridy=5;
    55.         gridBagConstraints11.insets=new Insets(0, 0, 0, 5);
    56.         gridBagConstraints11.weightx=1.0;
    57.         gridBagConstraints11.fill=GridBagConstraints.HORIZONTAL;
    58.         field5=new JTextField();
    59.         leftPanel.add(field5, gridBagConstraints11);
    60.  
    61.         GridBagConstraints gridBagConstraints12= new GridBagConstraints();
    62.         gridBagConstraints12.gridx=0;
    63.         gridBagConstraints12.gridy=6;
    64.         gridBagConstraints12.insets=new Insets(0, 5, 0, 0);
    65.         label6=new JLabel("销售收益");
    66.         leftPanel.add(label6, gridBagConstraints12);
    67.         GridBagConstraints gridBagConstraints13= new GridBagConstraints();
    68.         gridBagConstraints13.gridx=1;
    69.         gridBagConstraints13.gridy=6;
    70.         gridBagConstraints13.insets=new Insets(0, 0, 0, 5);
    71.         gridBagConstraints13.weightx=1.0;
    72.         gridBagConstraints13.fill=GridBagConstraints.HORIZONTAL;
    73.         field6=new JTextField();
    74.         leftPanel.add(field6, gridBagConstraints13);
    75.  
    76.         GridBagConstraints gridBagConstraints14= new GridBagConstraints();
    77.         gridBagConstraints14.gridx=0;
    78.         gridBagConstraints14.gridy=7;
    79.         gridBagConstraints14.insets=new Insets(0, 5, 0, 0);
    80.         label7=new JLabel("货款余额");
    81.         leftPanel.add(label7, gridBagConstraints14);
    82.         GridBagConstraints gridBagConstraints15= new GridBagConstraints();
    83.         gridBagConstraints15.gridx=1;
    84.         gridBagConstraints15.gridy=7;
    85.         gridBagConstraints15.insets=new Insets(0, 0, 0, 5);
    86.         gridBagConstraints15.weightx=1.0;
    87.         gridBagConstraints15.fill=GridBagConstraints.HORIZONTAL;
    88.         field7=new JTextField();
    89.         leftPanel.add(field7, gridBagConstraints15);
    90.  
    91.         GridBagConstraints gridBagConstraints16= new GridBagConstraints();
    92.         gridBagConstraints16.gridx=0;
    93.         gridBagConstraints16.gridy=8;
    94.         gridBagConstraints16.insets=new Insets(0, 0, 0, 5);
    95.         label8=new JLabel("经办人");
    96.         leftPanel.add(label8, gridBagConstraints16);
    97.         GridBagConstraints gridBagConstraints17= new GridBagConstraints();
    98.         gridBagConstraints17.gridx=1;
    99.         gridBagConstraints17.gridy=8;
    100.         gridBagConstraints17.insets=new Insets(0, 0, 0, 5);
    101.         gridBagConstraints17.weightx=1.0;
    102.         gridBagConstraints17.fill=GridBagConstraints.HORIZONTAL;
    103.         field8=new JTextField();
    104.         leftPanel.add(field8, gridBagConstraints17);
    105.  
    106.         GridBagConstraints gridBagConstraints18= new GridBagConstraints();
    107.         gridBagConstraints18.gridx=0;
    108.         gridBagConstraints18.gridy=9;
    109.         gridBagConstraints18.insets=new Insets(0, 5, 0, 0);
    110.         label9=new JLabel("销售日期");
    111.         leftPanel.add(label9, gridBagConstraints18);
    112.         GridBagConstraints gridBagConstraints19= new GridBagConstraints();
    113.         gridBagConstraints19.gridx=1;
    114.         gridBagConstraints19.gridy=9;
    115.         gridBagConstraints19.insets=new Insets(0, 0, 0, 5);
    116.         gridBagConstraints19.weightx=1.0;
    117.         gridBagConstraints19.fill=GridBagConstraints.HORIZONTAL;
    118.         field9=new JTextField();
    119.         leftPanel.add(field9, gridBagConstraints19);

    七、右侧面板设置背景图片

    Shan类增加

    构造方法增加

    先拿到文件下的图片并转换为ImageIcon，然后设置图片缩放大小，把图片放在面板组件上，面板由图片大小决定。

    1. URL url = this.getClass().getResource("011.jpg");
    2.         ImageIcon icon = new ImageIcon(url);
    3.         Image image = icon.getImage().getScaledInstance(100,220,3);
    4.         icon = new ImageIcon(image);
    5.         JLabel label = new JLabel();
    6.         label.setSize(icon.getIconWidth(),icon.getIconHeight());
    7.         label.setVerticalAlignment(SwingConstants.BOTTOM);
    8.         label.setIcon(icon);
    9.         rightPanel.add(label,BorderLayout.CENTER);

    八、增加“销售”“取消”按钮

    Shan类增加

    1.     public JButton button2;//销售按钮
    2.     public JButton button3;

    构造方法增加

    创建一个面板设置为边框布局，将此面板设置为上一面板的北部区域，将两个按钮添加。

    1. JPanel panel = new JPanel();
    2.         panel.setOpaque(false);
    3.         panel.setLayout(new BorderLayout());
    4.         rightPanel.add(panel,BorderLayout.NORTH);
    5.         button2 = new JButton("销售");
    6.         button3 = new JButton("取消");
    7.         panel.add(button2,BorderLayout.CENTER);
    8.         panel.add(button3,BorderLayout.SOUTH);

    至此，“删除内容”布局已经完成，下面将要完成具体功能。

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  • 原文地址：https://blog.csdn.net/Tir_zhang/article/details/125436058