Main类：主要负责UI显示。
1 package ConnectToMysql; 2 3 import java.awt.event.*; 4 import javax.swing.*; 5 import javax.swing.table.*; 6 7 import java.awt.*; 8 import java.util.*; 9 10 public class Main extends JFrame{ 11 static JPanel MainPanel,ButtonPanel; 12 static JLabel Pages; 13 static JButton Insert,Select,PageUp,PageDown,Page1,PageN; 14 static DBConnect DBC; 15 static PageController PC = new PageController(); 16 static JTable Table; 17 static String ob[][] = new String[20][4]; 18 static Font EnFont = new Font("Times New Roman",Font.BOLD,20); 19 static Font CnFont = new Font("宋体",Font.BOLD,20); 20 public Main() { 21 this.setTitle("Test"); 22 DBC = new DBConnect(); 23 ButtonPanel = new JPanel(null); 24 ButtonPanel.setPreferredSize(new Dimension(800,100)); 25 this.add(ButtonPanel,BorderLayout.SOUTH); 26 Select = new JButton("Select"); 27 Select.setBounds(180,55,150,40); 28 Select.setFont(EnFont); 29 Select.setEnabled(true); 30 Select.setMargin(new Insets(0,0,0,0)); 31 Select.addActionListener(new ActionListener() { 32 public void actionPerformed(ActionEvent e) { 33 PC = new PageController(DBC.SelectAll()); 34 Show(PC.ShowThisPage(1)); 35 Pages.setText(ResetText(1,PC.PageNum)); 36 } 37 }); 38 ButtonPanel.add(Select); 39 Insert = new JButton("Insert"); 40 Insert.setBounds(450,55,150,40); 41 Insert.setFont(EnFont); 42 Insert.setEnabled(true); 43 Insert.setMargin(new Insets(0,0,0,0)); 44 Insert.addActionListener(new ActionListener() { 45 public void actionPerformed(ActionEvent e) { 46 Object[] options = { "I know" }; //please wait 47 JOptionPane.showOptionDialog(null, "Information is being randomly generated into the database. This process may last for tens of seconds. Please wait for the prompt box to pop up.", "Attention Please", 48 JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, 49 null, options, options[0]); 50 DBC.RandomInsert(); 51 JOptionPane.showOptionDialog(null, "The data is generated successfully and you can use it normally.", "Success", 52 JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, 53 null, options, options[0]); 54 } 55 }); 56 ButtonPanel.add(Insert); 57 MainPanel = new JPanel(); 58 this.add(MainPanel); 59 Table = new JTable(); 60 this.add(Table); 61 62 PageUp = new JButton("<"); 63 PageUp.setBounds(200,10,80,30); 64 PageUp.setFont(EnFont); 65 PageUp.addActionListener(new ActionListener() { 66 public void actionPerformed(ActionEvent e) { 67 Vector V = PC.previousPage(); 68 Show(V); 69 Pages.setText(ResetText(PC.PageIndex,PC.PageNum)); 70 } 71 }); 72 ButtonPanel.add(PageUp); 73 74 PageDown = new JButton(">"); 75 PageDown.setBounds(500,10,80,30); 76 PageDown.setFont(EnFont); 77 PageDown.addActionListener(new ActionListener() { 78 public void actionPerformed(ActionEvent e) { 79 Vector V = PC.nextPage(); 80 Show(V); 81 Pages.setText(ResetText(PC.PageIndex,PC.PageNum)); 82 } 83 }); 84 ButtonPanel.add(PageDown); 85 86 Page1 = new JButton("<<"); 87 Page1.setBounds(100,10,80,30); 88 Page1.setFont(EnFont); 89 Page1.addActionListener(new ActionListener() { 90 public void actionPerformed(ActionEvent e) { 91 Vector V = PC.ShowThisPage(1); 92 Show(V); 93 Pages.setText(ResetText(PC.PageIndex,PC.PageNum)); 94 } 95 }); 96 ButtonPanel.add(Page1); 97 98 PageN = new JButton(">>"); 99 PageN.setBounds(600,10,80,30); 100 PageN.setFont(EnFont); 101 PageN.addActionListener(new ActionListener() { 102 public void actionPerformed(ActionEvent e) { 103 Vector V = PC.ShowThisPage(PC.PageNum); 104 Show(V); 105 Pages.setText(ResetText(PC.PageIndex,PC.PageNum)); 106 } 107 }); 108 ButtonPanel.add(PageN); 109 110 Pages = new JLabel("Page : Total :",JLabel.CENTER); 111 Pages.setBounds(300,10,180,30); 112 Pages.setFont(EnFont); 113 ButtonPanel.add(Pages); 114 115 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 116 this.setSize(800, 800); 117 Dimension winSize = Toolkit.getDefaultToolkit().getScreenSize(); 118 this.setLocation((winSize.width - this.getWidth()) / 2,(winSize.height - this.getHeight()) / 2); 119 this.setResizable(false); 120 this.setVisible(true); 121 } 122 123 public String ResetText(int x,int tot) { 124 String ans = "Page : "; 125 ans += String.valueOf(x); 126 ans += " , Total : "; 127 ans += String.valueOf(tot); 128 return ans; 129 } 130 131 public void Show(Vector V) { 132 ob = new String[20][4]; 133 int L = V.size(); 134 for(int i = 0;i < L;i ++) { 135 String sp[] = String.valueOf(V.get(i)).split(" "); 136 ob[i][0] = sp[0]; 137 ob[i][1] = sp[1]; 138 ob[i][2] = sp[2]; 139 ob[i][3] = sp[3]; 140 } 141 Table.getTableHeader().setFont(EnFont); 142 Table.setFont(EnFont); 143 Table.setRowHeight(30); 144 Table.setModel(new DefaultTableModel(ob,new String[] { "ID", "Name", "Sex", "Tel"})); 145 this.getContentPane().add(Table.getTableHeader(),BorderLayout.NORTH); 146 this.getContentPane().add(Table, BorderLayout.CENTER); 147 } 148 149 public static void main(String[] args) { 150 new Main(); 151 } 152 }
DBConnect类：负责向MySql建立连接并格式化Sql语句，本实例有清空表，向表插入数据以及选择表中全部数据三个功能。
使用的驱动为JDBC，用户名为user，密码为123456。
1 import java.sql.*; 2 import java.util.*; 3 4 public class DBConnect { 5 private String driver; 6 private String url; 7 private String user; 8 private String password; 9 static Random Rand = new Random(); 10 DBConnect () { 11 //DataBase name : db_test 12 //Table name : personal_information 13 //you need to build a database and a table first 14 Random Rand = new Random(); 15 driver = "com.mysql.cj.jdbc.Driver"; 16 url = "jdbc:mysql://localhost:3306/db_test?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true"; 17 user = "root"; 18 password = "123456"; 19 } 20 21 public int RandNum(int x) { 22 return Rand.nextInt(x); 23 } 24 public String RandSex() { 25 int sex = Rand.nextInt(10); 26 if(sex % 2 == 1) { 27 return "Male"; 28 } 29 return "Female"; 30 } 31 public String RandName() { 32 int L = RandNum(5) + 5; 33 String name = ""; 34 for(int i = 0;i < L;i ++) { 35 name += (char)((RandNum(100) % 26) + 'a'); 36 } 37 return name; 38 } 39 public String RandTel() { 40 String tel = ""; 41 for(int i = 0;i < 9;i ++) { 42 if(i == 3) {tel += "-";} 43 tel += String.valueOf(RandNum(100) % 10); 44 } 45 return tel; 46 } 47 48 void RandomInsert(){ 49 Connection conn; 50 PreparedStatement stmt; 51 try {// delete all information 52 Class.forName(driver); 53 conn = DriverManager.getConnection(url, user, password); 54 String SQL = "delete from personal_information"; 55 stmt = (PreparedStatement) conn.prepareStatement(SQL); 56 stmt.execute(); 57 } catch (ClassNotFoundException e) {e.printStackTrace();} 58 catch (SQLException e) {e.printStackTrace();} 59 60 int cnt = 200 + RandNum(20); 61 for(int i = 0;i < cnt;i ++) {// insert random information 62 try { 63 Class.forName(driver); 64 conn = DriverManager.getConnection(url, user, password); 65 String SQL = "insert into personal_information values (?,?,?,?)"; 66 stmt = (PreparedStatement) conn.prepareStatement(SQL); 67 stmt.setString(1, String.valueOf(i + 100000)); 68 stmt.setString(2, RandName()); 69 stmt.setString(3, RandSex()); 70 stmt.setString(4, RandTel()); 71 stmt.executeUpdate(); 72 stmt.close(); 73 conn.close(); 74 } catch (ClassNotFoundException e) {} 75 catch (SQLException e) {} 76 } 77 } 78 79 Vector SelectAll() {//select all information 80 Vector rowData = new Vector(); 81 try { 82 Class.forName(driver); 83 Connection conn = DriverManager.getConnection(url, user, password); 84 Statement state = conn.createStatement(); 85 String SQL = "select db_test.personal_information.ID," 86 + "db_test.personal_information.Name," 87 + "db_test.personal_information.Sex," 88 + "db_test.personal_information.Tel " 89 + "from db_test.personal_information"; 90 ResultSet rst = state.executeQuery(SQL); 91 while (rst.next()) { 92 String P = ""; 93 P += rst.getString("ID") + " "; 94 P += rst.getString("Name") + " "; 95 P += rst.getString("Sex") + " "; 96 P += rst.getString("Tel"); 97 rowData.add(P); 98 } 99 rst.close(); 100 state.close(); 101 conn.close(); 102 } catch (Exception e) {} 103 return rowData; 104 } 105 106 }
PageController类：负责管里表格中的数据，每个函数直接操作成员变量，再使用类中方法Select()，对当前页码中应有的数据依次存放并传出至调用的地方。
1 import java.sql.*; 2 import java.util.*; 3 4 public class PageController { 5 static Vector AllList = new Vector(); 6 static Vector NowList=new Vector(); 7 static int PageIndex = 1;//now page 8 static int PageSize = 20;//every page 9 static int PageNum; //total page 10 static int L;//total information 11 12 public PageController(){} 13 14 public PageController(Vector V){ 15 this.PageIndex = 1; 16 this.AllList = V; 17 this.L = V.size(); 18 this.PageNum = (L + PageSize - 1) / PageSize; 19 } 20 21 public Vector ShowThisPage(int x) { 22 this.PageIndex = x; 23 return select(); 24 } 25 26 27 public Vector nextPage() { 28 if (PageIndex < PageNum) { 29 PageIndex ++; 30 } 31 return select(); 32 } 33 34 public Vector previousPage() { 35 if (PageIndex > 1) { 36 PageIndex --; 37 } 38 return select(); 39 } 40 41 public Vector select(){ 42 NowList = new Vector(); 43 for(int i = (PageIndex-1)*PageSize; i < PageIndex*PageSize && i < L; i++){ 44 NowList.add(AllList.get(i)); 45 } 46 return NowList; 47 } 48 49 }
运行情况图示：
