Question

所以我的目标是制作一个可运行的罐子。我使用swings创建了一个使用MS Access数据库来获取记录的程序。所以，我使用绝对路径来引用数据库进行连接。现在，我打算将这个可运行的jar分发给其他人。所以我想最好的选择是在jar文件中嵌入MS Access数据库。但我不知道该怎么做。我应该在哪里将数据库保存在Project Explorer中？我应该使用相对路径等。任何形式的帮助都会很明显。

我发现了许多使用Derby数据库的教程，这些教程实现了相同但没有任何与Ms Access数据库相关的教程。欢迎提出建议！

这是我的代码： -

import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.util.Vector;

import javax.swing.*;
import javax.swing.table.DefaultTableModel;

public class r_search extends JFrame implements ActionListener {

    JFrame frame1;
    JLabel l0, l1, l2;
    JComboBox c1;
    JButton b1;
    Connection con;
    ResultSet rs, rs1;
    Statement st, st1;
    PreparedStatement pst;
    String ids;
    static JTable table;
    String[] columnNames = {"SECTION NAME", "REPORT NAME", "CONTACT", "LINK"};
    String from;






    r_search() {

        l0 = new JLabel("Fetching Search Results...");
        l0.setForeground(Color.blue);
        l0.setFont(new Font("Serif", Font.BOLD, 20));
        l1 = new JLabel("Search");
        b1 = new JButton("submit");

        l0.setBounds(100, 50, 350, 40);
        l1.setBounds(75, 110, 75, 20);
        b1.setBounds(150, 150, 150, 20);
        b1.addActionListener(this);

        setTitle("Search Executive Reports :) ");
        setLayout(null);
        //setVisible(true);
        setSize(500, 500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        add(l0);
        add(l1);;
        add(b1);
        try {
            Vector v = new Vector();
            String url="jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=" + "C:\\users\\ppreeti\\executive_db.accdb";
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            con=DriverManager.getConnection(url,"","");
            /*con = DriverManager.getConnection("jdbc:oracle:thin:@mcndesktop07:1521:xe", "sandeep", "welcome");*/
            st = con.createStatement();
            rs = st.executeQuery("select index_name from Index1");
           // Vector v = new Vector();
            while (rs.next()) {
                ids = rs.getString(1);
                v.add(ids);
            }
            c1 = new JComboBox(v);
            c1.setBounds(150, 110, 150, 20);

            add(c1);
            st.close();
            rs.close();
        } catch (Exception e) {
        }
        setVisible(true);
    }

    public void actionPerformed(ActionEvent ae) {
        if (ae.getSource() == b1) {
            showTableData();
        }

    }

    public void showTableData() {

        frame1 = new JFrame("Database Search Result");
        frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame1.setLayout(new BorderLayout());
//TableModel tm = new TableModel();
        DefaultTableModel model = new DefaultTableModel();
        model.setColumnIdentifiers(columnNames);
//DefaultTableModel model = new DefaultTableModel(tm.getData1(), tm.getColumnNames());
//table = new JTable(model);
        table = new JTable();
        table.setModel(model);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
        table.setFillsViewportHeight(true);
        JScrollPane scroll = new JScrollPane(table);
        scroll.setHorizontalScrollBarPolicy(
                JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        scroll.setVerticalScrollBarPolicy(
                JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        from = (String) c1.getSelectedItem();
//String textvalue = textbox.getText();
        String uname = "";
        String email = "";
        String pass = "";
        String cou = "";

        try {
           /* pst = con.prepareStatement("select * from emp where UNAME='" + from + "'");*/
             pst = con.prepareStatement("select distinct Section.Section_Name,Report.Report_Name,Report.Link,Contact.Contact_Name "
                        + "FROM (( Section INNER JOIN Report ON Report.Section_ID=Section.Section_ID ) INNER JOIN Contact ON Contact.Contact_ID=Report.Contact_ID )  LEFT JOIN Metrics ON Metrics.Report_ID=Report.Report_ID  "
                        + " WHERE Section.Section_Name LIKE '%"+from+"%' OR Report.Report_Name LIKE '%"+from+"%' OR Metrics.Metric_Name LIKE '%"+from+"%' OR Contact.Contact_Name LIKE '%"+from+"%' ");
            ResultSet rs = pst.executeQuery();
            int i = 0;
            while (rs.next()) {
                uname = rs.getString("Section_Name");
                email = rs.getString("Report_Name");
                pass = rs.getString("Contact_Name");
                cou = rs.getString("Link");
                model.addRow(new Object[]{uname, email, pass, cou});
                i++;
            }
            if (i < 1) {
                JOptionPane.showMessageDialog(null, "No Record Found", "Error", JOptionPane.ERROR_MESSAGE);
            }
            if (i == 1) {
                System.out.println(i + " Record Found");
            } else {
                System.out.println(i + " Records Found");
            }
        } catch (Exception ex) {
            JOptionPane.showMessageDialog(null, ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
        }
        frame1.add(scroll);
        frame1.setVisible(true);
        frame1.setSize(1000, 400);
    }

    public static void main(String args[]) {
        new r_search();
    }
}

Answer 1

以下使用Eclipse和JavaSE-1.7为我工作。 Eclipse在其Package Explorer中显示以下内容

项目文件夹中的[文件夹]和文件是

[C:]
   [Users]
      [Gord]
         [workspace]
            [com.example.jartest]
               [src]
                  [com]
                     [example]
                        [jartest]
                           JarTestMain.java
                           [resources]
                              JarData.mdb

JarTestMain.java中的Java代码是

package com.example.jartest;

import java.io.*;
import java.nio.file.*;
import java.sql.*;

public class JarTestMain {

    public static void main(String[] args) {
        String mdbFileName = "JarData.mdb";
        String tempDbPath = System.getenv("TEMP").replace('\\', '/') + "/" + mdbFileName; 

        // retrieve .mdb database from the JAR file and save to %TEMP% folder
        InputStream strmIn = JarTestMain.class.getResourceAsStream("resources/" + mdbFileName);
        File f = new File(tempDbPath);
        try {
            Files.copy(strmIn, f.toPath(), StandardCopyOption.REPLACE_EXISTING);
        } catch (IOException e) {
            e.printStackTrace();
        }

        // open the copy of the database in %TEMP% folder and read from its table
        String connectionString = 
                "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};" +
                "DBQ=" + tempDbPath;
        try (Connection con = DriverManager.getConnection(connectionString)) {
            Statement s = con.createStatement();
            ResultSet rs = s.executeQuery("SELECT * FROM Table1");
            while (rs.next()) {
                System.out.println(String.format(
                        "%d: %s", 
                        rs.getInt("ID"), 
                        rs.getString("TextField")));
            }
            rs.close();
            con.close();
            f.delete();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

将项目导出到名为JarTest.jar的“Runnable JAR文件”之后，我能够在我的32位Windows测试机上运行它...

"C:\Program Files\Java\jre7\bin\java" -jar JarTest.jar

...在我的64位Windows开发机器上通过

"C:\Program Files (x86)\Java\jre7\bin\java" -jar JarTest.jar

使用runnable jar嵌入MS Access数据库

1 个答案: