用”appletviwer OutputApplet.html“出现以下错误

netty 2004-05-14 09:22:56
java.security.AccessControlException:access denied(java.lang.RuntimePermission accessClassInPackage.sun.jdbc.odbc)

从错误信息上看,我以为是IE的安全设置问题,于是我把IE中关于JAVA运行的部分所有的选项改为“启用”,之后,还是没用,错误信息还是没变。

请问各位遇到过类似情况吗?如何解决的?

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netty 2004-05-14
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以下是OutputApplet.java的代码


/*
* Copyright 2003 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
* Use of this software is authorized pursuant to the terms of the license found at
* http://developer.java.sun.com/berkeley_license.html.
*/

/**
* This is a demonstration JDBC applet.
* It displays some simple standard output from the Coffee database.
*/

import java.applet.Applet;
import java.awt.Graphics;
import java.util.Vector;
import java.sql.*;

public class OutputApplet extends Applet implements Runnable {
private Thread worker;
private Vector queryResults;
private String message = "Initializing";

public synchronized void start() {
// Every time "start" is called we create a worker thread to
// re-evaluate the database query.
if (worker == null) {
message = "Connecting to database";
worker = new Thread(this);
worker.start();
}
}

/**
* The "run" method is called from the worker thread. Notice that
* because this method is doing potentially slow databases accesses
* we avoid making it a synchronized method.
*/

public void run() {
// String url = "jdbc:mySubprotocol:myDataSource";
String url = "jdbc:odbc:server1";
String query = "select COF_NAME, PRICE from COFFEES";

try {
//Class.forName("myDriver.ClassName");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch(Exception ex) {
setError("Can't find Database driver class: " + ex);
return;
}

try {
Vector results = new Vector();
Connection con = DriverManager.getConnection(url,
"sa", "");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
String s = rs.getString("COF_NAME");
float f = rs.getFloat("PRICE");
String text = s + " " + f;
results.addElement(text);
}

stmt.close();
con.close();

setResults(results);

} catch(SQLException ex) {
setError("SQLException: " + ex);
}
}

/**
* The "paint" method is called by AWT when it wants us to
* display our current state on the screen.
*/

public synchronized void paint(Graphics g) {
// If there are no results available, display the current message.
if (queryResults == null) {
g.drawString(message, 5, 50);
return;
}

// Display the results.
g.drawString("Prices of coffee per pound: ", 5, 10);
int y = 30;
java.util.Enumeration enum = queryResults.elements();
while (enum.hasMoreElements()) {
String text = (String)enum.nextElement();
g.drawString(text, 5, y);
y = y + 15;
}
}

/**
* This private method is used to record an error message for
* later display.
*/

private synchronized void setError(String mess) {
queryResults = null;
message = mess;
worker = null;
// And ask AWT to repaint this applet.
repaint();
}

/**
* This private method is used to record the results of a query, for
* later display.
*/

private synchronized void setResults(Vector results) {
queryResults = results;
worker = null;
// And ask AWT to repaint this applet.
repaint();
}
}
jianxiazwx 2004-05-14
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appletviwer OutputApplet.html,把次文件内容贴出来
netty 2004-05-14
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楼上的,这个没问题。
环境变量没问题。不用Applet,将Applet程序改用一般程序的执行方式是没有问题,
这说明环境变量设置是正确的。
jianxiazwx 2004-05-14
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把sun.jdbc.odbc放入环境变量classpath中
netty 2004-05-14
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