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下面是小程序代碼，它使用jna.jar（https://github.com/twall/jna）來訪問system32中的DLL文件。小程序在eclipse中運行，但不在瀏覽器中 - java安全
import javax.swing.*;
import javax.print.*;
import java.security.*;
import java.util.ArrayList;
import com.sun.jna.Library;
import com.sun.jna.Native;
import java.awt.*;
import java.awt.event.*;
import java.io.PrintWriter;
import java.io.StringWriter;
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinUser;
import com.sun.jna.platform.win32.WinUser.WNDENUMPROC;
import com.sun.jna.win32.StdCallLibrary;
public class CallApplet extends JApplet implements ActionListener {
/**
*
*/
private static final long serialVersionUID = 4654357272074276081L;
static JTextField output;
private final String ButtonText = "Print";
public void init() {
Container contentHolder = getContentPane();
contentHolder.setLayout(new BorderLayout(18,18));
output = new JTextField(20);
//add(output);
contentHolder.add(output, BorderLayout.CENTER);
JPanel buttonPanel = new JPanel();
JButton b = new JButton(ButtonText);
b.addActionListener(this);
buttonPanel.add(b);
contentHolder.add(buttonPanel, BorderLayout.SOUTH);
validate();
}
public void actionPerformed(ActionEvent evt)
{
//get the text of the button that was pushed
String command = evt.getActionCommand();
output.setText(command);
// if myButton was pressed, output a message
if(ButtonText.equals(command)) {
try {
this.mprintt("TSC TTP-244 Plus");
} catch (Exception e) {
}
}
}
public void setMessage(String message) {
output.setText(message);
}
public interface TscLibDll extends Library {
TscLibDll INSTANCE = (TscLibDll) Native.loadLibrary ("TSCLIB", TscLibDll.class);
int about();
int openport (String pirnterName);
int closeport();
int sendcommand (String printerCommand);
int setup (String width,String height,String speed,String density,String sensor,String vertical,String offset);
int downloadpcx (String filename,String image_name);
int barcode (String x,String y,String type,String height,String readable,String rotation,String narrow,String wide,String code);
int printerfont (String x,String y,String fonttype,String rotation,String xmul,String ymul,String text);
int clearbuffer();
int printlabel (String set, String copy);
int formfeed();
int nobackfeed();
int windowsfont (int x, int y, int fontheight, int rotation, int fontstyle, int fontunderline, String szFaceName, String content);
}
public void mprintt(String printer) {
try {
//TscLibDll.INSTANCE.about();
TscLibDll.INSTANCE.openport(printer);
//TscLibDll.INSTANCE.downloadpcx("C:\\UL.PCX", "UL.PCX");
TscLibDll.INSTANCE.sendcommand("REM ***** This is a test by JAVA. *****");
TscLibDll.INSTANCE.setup("35", "15", "3", "8", "0", "3", "-1");
TscLibDll.INSTANCE.clearbuffer();
//TscLibDll.INSTANCE.sendcommand("PUTPCX 550,10,\"UL.PCX\"");
TscLibDll.INSTANCE.printerfont ("290", "8", "3", "0", "1", "1", "ARTICLE NO");
TscLibDll.INSTANCE.barcode("290", "35", "128", "50", "1", "0", "2", "2", "123456789");
//TscLibDll.INSTANCE.windowsfont(400, 200, 48, 0, 3, 1, "arial", "DEG 0");
//TscLibDll.INSTANCE.windowsfont(400, 200, 48, 90, 3, 1, "arial", "DEG 90");
//TscLibDll.INSTANCE.windowsfont(400, 200, 48, 180, 3, 1, "arial", "DEG 180");
//TscLibDll.INSTANCE.windowsfont(400, 200, 48, 270, 3, 1, "arial", "DEG 270");
TscLibDll.INSTANCE.printlabel("1", "1");
TscLibDll.INSTANCE.closeport();
output.setText("printed");
} catch (Exception e) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
e.printStackTrace(pw);
output.setText(sw.toString());
}
}
}
我的HTML代碼
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<applet codebase ="." code="CallApplet.class"
archive="CallApplet.jar,jna.jar,platform.jar"
height="100" width="100"/>
</body>
</html>
我可以看到裝載的小應用程序和瀏覽器中的所有元素擺動，當我嘗試點擊打印它只是不會做任何事情。在日食運行它工作正常。
我知道這是安全問題，所以我也加入了政策（C：\ Program Files文件\的Java \ jre7 \ lib \ security中\ java.policy文件）
grant codeBase "http://localhost:8080/appletproj/*" {
permission java.security.AllPermission;
};
堆棧跟蹤
Exception in thread "AWT-EventQueue-7" java.lang.NoClassDefFoundError: com/sun/jna/Library
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.defineClassHelper(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.access$100(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at CallApplet.mprintt(CallApplet.java:185)
at CallApplet.actionPerformed(CallApplet.java:60)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.sun.jna.Library
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 55 more
但即使這樣也無濟於事。請指導我哪裏錯了。
SOLUTION
坦率地說，我沒有得到解決工作，而它不是那麼與實際誤差
產生新的問題是安全問題因此得到確切的錯誤我啓用Java控制檯（由安德魯·建議），你可以go here如何做到這一點。
UPDATE
之後幾天，我得到它的工作，問題是jna.jar和platform.jar它已經簽署所以每當我使用的jarsigner它從來沒有工作，我從來沒有任何錯誤（所以我簽了字從來沒有看過他們），當我用jarsigner驗證它時，我發現了它。然後我簽署了他們，並使用我用我的罐子使用相同的密鑰（希望它會幫助其他人）簽署它
你可以指向一些網址，顯示如何使用startssl.com提供的免費證書和數字簽名jar文件 – Sudesh
1）免費證書用於簽署代碼的方式與支付的方式完全相同。 2）我懷疑該網站提及的證書不適用於簽署代碼。 3）AFAIU可用的* only * free * code *簽名證書，由SDK生成。 –
只是爲了讓你知道我已經使用jarsigner簽署了jar（自簽名） – Sudesh