小程序和库

发布于 2024-10-10 01:45:38 字数 785 浏览 5 评论 0原文

我的小程序看不到外部库。一切都可以使用 appletviewer 进行，但不能使用浏览器。我已将包含 applet 类的 jar (TreC-Vis.jar)、TreC-Vis 使用的四个 jar 库以及带有以下 applet 标记的 html 文件放入“test_applet”文件夹中：

<applet code="gui.Gui" archive="TreC-Vis.jar,postgresql-8.4-701.jdbc4.jar,postgis_1.5.0.jar,jfreechart-1.0.13.jar,jcommon-1.0.16.jar" width="1024" height="768"> </applet>

Java 控制台为我提供了 java.io四个 jar 库中的每一个都出现 .FileNotFoundException。我指定从相应的 Eclipse 项目导出 TreC-Vis.jar，其中我将这些库放在“src”包同一级别的“lib”文件夹中。

我写的小程序标签有什么问题？阅读此处的教程

http://download.oracle.com/javase/tutorial /deployment/jar/downman.html

我一直在考虑将所有内容（小程序和库）放在一个 jar 中作为解决方案的可能性，但我需要注释中提到的“自定义代码”的一些示例。提前致谢。

原文

My applet doesn’t see the external libraries. Everything works using the appletviewer, but not using the browser. I’ve put in my “test_applet” folder the jar (TreC-Vis.jar) containing the applet classes, four jar libraries used by TreC-Vis and the html file with the following applet tag:

<applet code="gui.Gui" archive="TreC-Vis.jar,postgresql-8.4-701.jdbc4.jar,postgis_1.5.0.jar,jfreechart-1.0.13.jar,jcommon-1.0.16.jar" width="1024" height="768"> </applet>

Java console gives me a java.io.FileNotFoundException for each of the four jar libraries.
I specify that I exported TreC-Vis.jar from the corresponding Eclipse project, in which I put these libraries in a “lib” folder at the same level of the “src” package.

What’s wrong with the applet tag I wrote?
Reading the tutorial here

http://download.oracle.com/javase/tutorial/deployment/jar/downman.html

I’ve been considering the possibility to put everything, applet and libraries, in one jar as a solution, but I would need some example of the “custom code” mentioned in the Note.
Thanks in advance.

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千纸鹤 2024-10-17 01:45:39

jar cfm MyApplet.jar MyManifest.txt MyPackage1 MyPackage2 MyPackage3

这就是我一直在寻找的线路。这样我就将外部库的类路径放入了清单中。

jar cfm MyApplet.jar MyManifest.txt MyPackage1 MyPackage2 MyPackage3

This was the line I was looking for. This way I've put in my manifest the classpath of the external libraries.

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橙味迷妹 2024-10-17 01:45:39

这是我的代码以及我如何在其中使用本机库。它在 Windows 中可以工作，但在 Linux 中不起作用，并且我收到

访问被拒绝（“java.lang.RuntimePermission”“loadLibrary.hello”）

这是我的 JNLP：

<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="" href="">

    <resources>
        <!-- Application Resources -->
        <j2se version="1.7+"
              href="http://java.sun.com/products/autodl/j2se"/>
        <jar href="applet.jar" main="true" />
        <nativelib download="eager" href="libhello.jar"/>
    </resources>
    <applet-desc 
         name="Math Applet"
         main-class="NativeHelloApplet"
         width="10"
         height="1">
     </applet-desc>
     <update check="background"/>
</jnlp>

我的 Applet：

import java.security.*;
import javax.swing.*;

public class NativeHelloApplet extends JApplet
{
    public native String displayHelloWorld();
    public native int initPKE (int[] retVal); 

    public NativeHelloApplet() {   
    }

    public void init()
    {
        // privileged code goes here, for example:
        System.loadLibrary("hello");
        getContentPane().add(new JLabel("Test"));
        getContentPane().add(new JLabel(displayHelloWorld()));
    }
}

我的本机 .c 代码：

#include <jni.h>
#include "NativeHelloApplet.h"
#include <stdio.h>

JNIEXPORT jstring JNICALL
Java_NativeHelloApplet_displayHelloWorld(JNIEnv *env, jobject obj)
{
    return (*env)->NewStringUTF(env,"Hello world!\n");
}

我的 HTML 页面：

<Html>
<Head>
<Title>Java Example</Title>
</Head>
<Body>
This is my page<br>
Below you see an applet<br>
<br>
<script language="javascript" type="text/javascript" src="deployJava.js"></script>
 <script>
            var attributes = {
                id:         "sswSignApplet",
                code:       "NativeHelloApplet",
                width:      300,
                height:     60
            };
            var parameters = {jnlp_href:"launch.jnlp"}; <!-- Applet Parameters -->
            var version = "1.6"; <!-- Required Java Version -->
            deployJava.runApplet(attributes, parameters, version);
        </script>
</Body>
</Html>

libhello.jar 包含我的本机代码的共享对象，并且与 html 和 jnlp 位于同一文件夹中。

当我将 hello.jar（包含 hello.dll）放入资源部分时，它在 Windows 中有效，但在 Linux 中我收到了上述错误。

Here is my code and how I have used native libraries in that. It does work in Windowes but it doesn't work in Linux and I receive

access denied("java.lang.RuntimePermission""loadLibrary.hello")

Here is my JNLP:

<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="" href="">

    <resources>
        <!-- Application Resources -->
        <j2se version="1.7+"
              href="http://java.sun.com/products/autodl/j2se"/>
        <jar href="applet.jar" main="true" />
        <nativelib download="eager" href="libhello.jar"/>
    </resources>
    <applet-desc 
         name="Math Applet"
         main-class="NativeHelloApplet"
         width="10"
         height="1">
     </applet-desc>
     <update check="background"/>
</jnlp>

My Applet:

import java.security.*;
import javax.swing.*;

public class NativeHelloApplet extends JApplet
{
    public native String displayHelloWorld();
    public native int initPKE (int[] retVal); 

    public NativeHelloApplet() {   
    }

    public void init()
    {
        // privileged code goes here, for example:
        System.loadLibrary("hello");
        getContentPane().add(new JLabel("Test"));
        getContentPane().add(new JLabel(displayHelloWorld()));
    }
}

My native .c code :

#include <jni.h>
#include "NativeHelloApplet.h"
#include <stdio.h>

JNIEXPORT jstring JNICALL
Java_NativeHelloApplet_displayHelloWorld(JNIEnv *env, jobject obj)
{
    return (*env)->NewStringUTF(env,"Hello world!\n");
}

My HTML page:

<Html>
<Head>
<Title>Java Example</Title>
</Head>
<Body>
This is my page<br>
Below you see an applet<br>
<br>
<script language="javascript" type="text/javascript" src="deployJava.js"></script>
 <script>
            var attributes = {
                id:         "sswSignApplet",
                code:       "NativeHelloApplet",
                width:      300,
                height:     60
            };
            var parameters = {jnlp_href:"launch.jnlp"}; <!-- Applet Parameters -->
            var version = "1.6"; <!-- Required Java Version -->
            deployJava.runApplet(attributes, parameters, version);
        </script>
</Body>
</Html>

libhello.jar contains the shared object of my native code and is located on the same folder as html and jnlp.

It works in windows when I put hello.jar(containing hello.dll) in resource section but in Linux I received the mentioned error.

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