chinacharconversionframe.java

java数据库编程实例—————————很好很强大第

package chinacharconversion;
import com.borland.jbcl.layout.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.lang.Object.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

/**
   * Title:				中文字符转换程序
   * Description:			教学示范
   * Copyright:				Copyright (c) 2003
   * Company:				北京师范大学计算机系
   * @author				孙一林
   * @version				1.0
   */

public class ChinaCharConversionFrame extends JFrame {
  private JPanel contentPane;
  private XYLayout xYLayout1 = new XYLayout(); // 构造XYLayout布局管理器
  // 创建显示信息的组件
  private Label label1 = new Label();
  private Label label2 = new Label();
  private Label label3 = new Label();
  private Label label4 = new Label();
  private Label label5 = new Label();
  private TextField stunumField = new TextField();
  private TextField nameField = new TextField();
  private TextField ageField = new TextField();
  private TextField sexField = new TextField();
  private TextField departmentField = new TextField();
  private Button addButton = new Button();
  private Button displayButton = new Button();

  Vector vector;                                         // 声明一个向量对象
  String title[] = {"学号","姓名","年龄","性别","系名"};    // 二维表列名
  Connection connection = null;                          // 声明Connection接口对象connection
  ResultSet rs = null;                                   // 定义数据库查询的结果集
  Statement statement = null;                            // 定义查询数据库的Statement对象

  AbstractTableModel tm;                                 // 声明一个AbstractTableModel类对象tm
  String name,sex,department;                     // 定义姓名、性别、系名文本框对应的字符串变量以进行转换

  public ChinaCharConversionFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
     // 初始化组件
    label1.setText("学号");
    contentPane.setLayout(xYLayout1);
    this.setSize(new Dimension(432, 434));
    this.setTitle("中文字符转换");
    label2.setText("姓名");
    label3.setText("年龄");
    label4.setText("性别");
    label5.setText("系名");
    addButton.setLabel("添加记录");
    addButton.addActionListener(new java.awt.event.ActionListener() {// 设置addButton按钮监听器
      public void actionPerformed(ActionEvent e) {
        addButton_actionPerformed(e);
      }
    });
    displayButton.setLabel("显示所有记录");
    displayButton.addActionListener(new java.awt.event.ActionListener() {// 设置displayButton按钮监听器
      public void actionPerformed(ActionEvent e) {
        displayButton_actionPerformed(e);
      }
    });
    contentPane.add(displayButton,  new XYConstraints(226, 325, -1, 34));
    contentPane.add(label1,  new XYConstraints(39, 256, 41, 26));
    contentPane.add(label2,  new XYConstraints(113, 256, 41, 26));
    contentPane.add(label3,  new XYConstraints(187, 256, 41, 26));
    contentPane.add(label4,  new XYConstraints(260, 256, 41, 26));
    contentPane.add(label5,  new XYConstraints(334, 256, 41, 26));
    contentPane.add(stunumField,  new XYConstraints(29, 286, 59, 26));
    contentPane.add(nameField,  new XYConstraints(104, 286, 59, 26));
    contentPane.add(ageField,  new XYConstraints(180, 286, 59, 26));
    contentPane.add(sexField,  new XYConstraints(255, 286, 59, 26));
    contentPane.add(departmentField,  new XYConstraints(330, 286, 59, 26));
    contentPane.add(addButton,  new XYConstraints(86, 325, 107, 34));
    createtable();                                 // 在初始化函数中调用createtable()函数显示表格
  }
  void createtable() {                             // 定义createtable()函数
    JTable table;                                  // 声明一个JTable类对象table
    JScrollPane scroll;                            // 声明一个滚动杠对象scroll
    vector = new Vector();                         // 创建向量对象
    tm = new AbstractTableModel() {                // 创建AbstractTableModel类对象tm
      public int getColumnCount() {                // 取得表格列数
        return title.length;
      }
      public int getRowCount() {                   // 取得表格行数
        return vector.size();
      }
      public Object getValueAt(int row, int column) {   // 取得单元格中的属性值
        if(!vector.isEmpty()) {
          return ((Vector)vector.elementAt(row)).elementAt(column);
        }
        else {
          return null;
        }
      }
      public void setValueAt(Object value, int row, int column) { // 数据模型不可编辑，该方法设置为空

      }
      public String getColumnName(int column) {          // 取得表格列名
        return title[column];
      }
      public Class getColumnClass(int c) {               // 取得列所属对象类
        return getValueAt(0,c).getClass();
      }
      public boolean isCellEditable(int row, int column) {// 设置单元格不可编辑，为缺省实现
        return false;
      }
    };
    table = new JTable(tm);                              // 生成自己的数据模型
    table.setToolTipText("Display Query Result");        // 设置帮助提示
    table.setAutoResizeMode(table.AUTO_RESIZE_OFF);      // 设置表格调整尺寸模式
    table.setCellSelectionEnabled(false);                // 设置单元格选择方式
    table.setShowHorizontalLines(true);                  // 设置是否显示单元格之间的分割线
    table.setShowVerticalLines(true);
    scroll = new JScrollPane(table);                     // 给表格加上滚动杠
    scroll.setBounds(6,20,540,250);
    contentPane.add(scroll,new XYConstraints(16, 20, 395, 200));
  }

  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  public static String toTureAsciiStr(String str){  // 定义将中英文字串转换成纯英文字串共用静态方法
    StringBuffer sb=new StringBuffer();
    byte[] bt=str.getBytes();                       // 把要转换的字符串转换为字节形式
    for(int i=0;i<bt.length;i++){
      if(bt[i]<0){                                  // 判断是否为汉字，如是则去高位1
        sb.append((char)(bt[i]&(0x7f)));
      }
      else{                                         // 是英文字符补0作记录
        sb.append((char)0);
        sb.append((char)bt[i]);
      }
    }
    return  sb.toString();                          // 返回转换后的英文字符串
  }

  public static String unToTrueAsciiStr(String str){// 定义将经转换的字串还原方法
    byte[] bt=str.getBytes() ;
    int i;
    int l=0;
    int length=bt.length;
    int j=0;
    for(i=0;i<length;i++){                          // 判断有几个英文字符以去除Byte 0
      if(bt[i]==0){
        l++;
        }
    }
    byte[] bt2=new byte[length-l];                  // 定义返回的字节数组
    for(i=0;i<length;i++){
      if(bt[i]==0){                                 // 是英文字符去掉0
        i++;
        bt2[j]=bt[i];
      }
      else{                                         // 是汉字补上高位1
        bt2[j]=(byte)(bt[i]|0x80);
      }
      j++;
    }
    String tt=new String(bt2);
    return tt;                                     // 返回还原后的字符串
  }

  void addButton_actionPerformed(ActionEvent e) {
    try {
      // 调用toTureAsciiStr()函数将中英文信息转换为英文信息
      name=toTureAsciiStr(nameField.getText());
      sex=toTureAsciiStr(sexField.getText());
      department=toTureAsciiStr(departmentField.getText());
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");  // 实例化JDBC-ODBC桥的驱动
      String url = "jdbc:odbc:TestDbStu";             // 设置连接字符串
      connection = DriverManager.getConnection(url); // 连接数据库
      statement = connection.createStatement();
      String sql = "insert into studentbase (学号,姓名,年龄,性别,系名) values (" +Integer.parseInt(stunumField.getText()) +", '" +name+"',"+Integer.parseInt(ageField.getText())+",'"+sex+"',"+"'"+department+ "')";
      statement.executeUpdate(sql);             // 执行增加新的数据记录语句
      // 清空文本框信息
      stunumField.setText("");
      nameField.setText("");
      ageField.setText("");
      sexField.setText("");
      departmentField.setText("");
    }
    catch(SQLException ex){                                // 捕捉异常
      System.out.println("\nERROR:----- SQLException -----\n");
      while (ex != null) {
        System.out.println("Message:   " + ex.getMessage());
        System.out.println("SQLState:  " + ex.getSQLState());
        System.out.println("ErrorCode: " + ex.getErrorCode());
        ex = ex.getNextException();
      }
    }
    catch(Exception ex ) {
      ex.printStackTrace();
    }
    finally {
      try {
        if(statement != null) {
          statement.close();                                // 关闭Statement接口实例
        }
        if(connection != null) {
          connection.close();                               // 关闭Connection接口实例
        }
      }
      catch (SQLException ex)  {
        System.out.println("\nERROR:----- SQLException -----\n");
        System.out.println("Message:   " + ex.getMessage( ));
        System.out.println("SQLState:  " + ex.getSQLState());
        System.out.println("ErrorCode: " + ex.getErrorCode());
      }
    }
  }

  void displayButton_actionPerformed(ActionEvent e) {
    try {
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");   // 实例化JDBC-ODBC桥的驱动
      String url = "jdbc:odbc:TestDbStu";              // 设置连接字符串
      connection = DriverManager.getConnection(url);   // 连接数据库
      // 创建Statement接口对象
      statement = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
      String sql = "select * from studentbase";
      // 执行statement对象的executeQuery方法，查询studentbase表，将查询结果放入rs中
      ResultSet rs = statement.executeQuery(sql);
      vector.removeAllElements();                      // 初始化向量对象
      tm.fireTableStructureChanged();                  // 更新表格内容
      while(rs.next()) {
        Vector rec_vector = new Vector();
        // 从结果集中取数据放入向量rec_vector中
        rec_vector.addElement(String.valueOf(rs.getInt("学号")));
        rec_vector.addElement(unToTrueAsciiStr(rs.getString("姓名"))); // 调用unToTrueAsciiStr函数还原为中文信息再添加
        rec_vector.addElement(String.valueOf(rs.getInt("年龄")));
        rec_vector.addElement(unToTrueAsciiStr(rs.getString("性别"))); // 调用unToTrueAsciiStr函数还原为中文信息再添加
        rec_vector.addElement(unToTrueAsciiStr(rs.getString("系名"))); // 调用unToTrueAsciiStr函数还原为中文信息再添加
        vector.addElement(rec_vector);                 // 向量rec_vector加入向量vector中
      }
      tm.fireTableStructureChanged();                  // 更新表格，显示向量vector的内容
      rs.close() ;                                         // 关闭结果集
    }
    catch(SQLException ex){                                // 捕捉异常
      System.out.println("\nERROR:----- SQLException -----\n");
      while (ex != null) {
        System.out.println("Message:   " + ex.getMessage());
        System.out.println("SQLState:  " + ex.getSQLState());
        System.out.println("ErrorCode: " + ex.getErrorCode());
        ex = ex.getNextException();
      }
    }
    catch(Exception ex ) {
      ex.printStackTrace();
    }
    finally {
      try {
        if(statement != null) {
          statement.close();                                // 关闭Statement接口实例
        }
        if(connection != null) {
          connection.close();                               // 关闭Connection接口实例
        }
      }
      catch (SQLException ex)  {
        System.out.println("\nERROR:----- SQLException -----\n");
        System.out.println("Message:   " + ex.getMessage( ));
        System.out.println("SQLState:  " + ex.getSQLState());
        System.out.println("ErrorCode: " + ex.getErrorCode());
      }
    }
  }
}