Question

我有一些项目可以为mys自己做，但我无法解决难题:) 例如，我有这样的代码，但它在我的网站上也没有工作

它抛出：NoClassDefFoundError

我创建文件.java并将其与数据库（？）

链接

package firebird;

import java.sql.*;

public class Firebird {

    public static void main(String[] args) throws ClassNotFoundException {

    String pathToDatabase;
    String userName;
    String password;
    String sql;

    sql = "SELECT * FROM EMPLOYEE";
    password = "masterkey";
    userName = "sysdba";
    pathToDatabase = "C:/Program Files/Firebird/Firebird_2_5/examples/empbuild/EMPLOYEE.FDB";

try {
    Class.forName("org.firebirdsql.jdbc.FBDriver");
    } catch(ClassNotFoundException cnfe) {
      System.out.println(cnfe.toString());  
      System.out.println("org.firebirdsql.jdbc.FBDriver not found"); 
    }
// Retrieve a connection.
try {
    Statement stmt = null;
    ResultSet rst = null;
    Connection conn = DriverManager.getConnection(
    "jdbc:firebirdsql:localhost/3050:" + pathToDatabase, userName, password);
try {
  stmt = conn.createStatement();
  rst = stmt.executeQuery(sql);
  int columnCount = rst.getMetaData().getColumnCount();
  int recordIndex = 0;
 while(rst.next()) {
  recordIndex++;
  System.out.println("Record: " + recordIndex);
    for (int i=1;i<=columnCount;i++) {
     System.out.print(rst.getMetaData().getColumnName(i));
     System.out.print(": ");
     System.out.println(rst.getString(i));
    }
 }
} finally {
// close the database resources immediately, rather than waiting
// for the finalizer to kick in later
  if (rst != null) { rst.close(); }
  if (stmt != null) { stmt.close(); }
  conn.close();
}
} catch(SQLException se) {
  System.out.println(se.toString());
}
}        

}

我使用console编译代码并获取.class文件

我使用以下代码创建.html文件：

<HTML>
 <HEAD>
 <TITLE>Java_DB</TITLE>
 </HEAD>
 <BODY>
 Svetainė parašyta su java ir joje duombazė <BR><BR>

 <applet code="Firebird.class" width="1000" height ="500">

 </BODY>
 </HTML>

Answer 1

您应该archive添加applet tag。如果你没有Firebird.jar，你应该创建它。

<applet 
    code="firebird/Firebird" 
    archive="Firebird.jar" 
    width=1000
    height=500>
</applet>

互联网站点Java Applet与firebird数据库

1 个答案: