java 使用 Jboss7 加载资源返回 null

Load Resource returns null with Jboss7

提问by Pierre

How do I load resources like images from the java code with Jboss7.1?

如何使用 Jboss7.1 从 java 代码加载图像等资源？

This used to work with Jboss4:

这曾经与 Jboss4 一起使用：

this.getClass().getClassLoader().getResourceAsStream("/myapp/includes/images/image1.png");

Now this returns null.

现在这将返回 null。

What is best practice for loading resources in java code now with Jboss7?

现在使用 Jboss7 在 Java 代码中加载资源的最佳实践是什么？

I did some testing:

我做了一些测试：

URL url = this.getClass().getResource("");
System.out.println(url);
url = this.getClass().getResource("../../../");
System.out.println(url);
url = this.getClass().getResource("../../../../");
System.out.println(url);
url = this.getClass().getResource("../../../../../");
System.out.println(url);
url = this.getClass().getResource("includes");
System.out.println(url);

13:33:49,143 INFO  [stdout] (http--127.0.0.1-8080-1) vfs:/C:/Eclipse/apps/jboss-as-7.1.1.Final/standalone/deployments/my-ea.ear/my-web.war/WEB-INF/classes/com/xxx/yyy/beans/jsf/
13:33:49,144 INFO  [stdout] (http--127.0.0.1-8080-1) vfs:/C:/Eclipse/apps/jboss-as-7.1.1.Final/standalone/deployments/my-ea.ear/my-web.war/WEB-INF/classes/com/xxx/
13:33:49,150 INFO  [stdout] (http--127.0.0.1-8080-1) jar:file:/C:/Eclipse/apps/jboss-as-7.1.1.Final/modules/javax/activation/api/main/activation-1.1.1.jar!/com/
13:33:49,151 INFO  [stdout] (http--127.0.0.1-8080-1) file:/C:/Eclipse/apps/jboss-as-7.1.1.Final/modules/sun/jdk/main/service-loader-resources/
13:33:49,152 INFO  [stdout] (http--127.0.0.1-8080-1) null

采纳答案by JoseK

As documentedon the JBoss community wiki (without using a jboss-deployment-structure.xmlfile):

作为记录JBoss的社区维基（不使用jboss-deployment-structure.xml文件）：

1. Create a module for the configuration file (jboss-as-7/modules/com/yourcompany/configuration/main/module.xml):

1. 为配置文件 ( jboss-as-7/modules/com/yourcompany/configuration/main/module.xml)创建一个模块：

<?xml version="1.0" encoding="UTF-8"?>
<module xmlns="urn:jboss:module:1.1" name="com.mycompany.configuration">
    <resources>
        <resource-root path="."/>
    </resources>
</module>

1. Add properties to the module:

2. 向模块添加属性：

jboss-as-7/
   modules/
      com/
         yourcompany/
            configuration/
               main/
                 module.xml
                 settings.properties
                 other-settings.xm

1. Add the module to the CLASSPATHusing a MANIFEST.MFentry:

3. 将模块添加到CLASSPATHusingMANIFEST.MF条目：

Manifest-Version: 1.0
Dependencies: com.mycompany.configuration

1. Load a properties file from the CLASSPATH:

4. 从 CLASSPATH 加载属性文件：

InputStream settingsStream = 
  getClass().getClassLoader().getResourceAsStream("settings.properties");

I had to create a module folder called com/mycompany/mainand add all the images in there. So this sits outside the WAR at least though within JBOSS_HOME. Then I could load the image using:

我必须创建一个名为的模块文件夹com/mycompany/main并在其中添加所有图像。所以这至少在 WAR 之外，尽管在JBOSS_HOME. 然后我可以使用以下方法加载图像：

URL imgUrl = this.getClass().getClassLoader().getResource("myimage.jpg");

回答by Thor

The method this.getClass().getClassLoader().getResourceAsStream("path")is handling the pathfrom the root of your classpath. In a WAR this is normally WEB-INF/classesand WEB-INF/lib.

该方法this.getClass().getClassLoader().getResourceAsStream("path")正在处理从类路径的根开始的路径。在 WAR 中，这通常是WEB-INF/classes和WEB-INF/lib。

Your path WebContent/includes/images/seems to be inside the root of your WAR file (which is not the classpath). So you can

您的路径WebContent/includes/images/似乎在 WAR 文件的根目录中（不是类路径）。所以你可以

• use getResourceAsStreamof ServletContext(see here) which handles paths to the root of the WAR file.
• package all of your images in a additional JAR (e.g. my-app.resources.jar) and use ClassLoader.getResourceAsStream()
• move your images in the classpath (see above).

• 使用getResourceAsStream的ServletContext（见此处），该把手路径WAR文件的根目录。
• 将所有图像打包在一个额外的 JAR（例如my-app.resources.jar）中并使用ClassLoader.getResourceAsStream()
• 在类路径中移动您的图像（见上文）。

回答by Prakhyat

The class loading in JBOSS 7 is based upon JBOSS module project. All earlier versions loading is in a hierarchical manner.

JBOSS 7 中的类加载基于 JBOSS 模块项目。所有早期版本的加载都是以分层方式进行的。

In earlier versions of JBOSS we can put/specify the external folder containing all the app properties in the classpath attribute by modifying run.sh/run.bat.

在早期版本的 JBOSS 中，我们可以通过修改 run.sh/run.bat 在 classpath 属性中放置/指定包含所有应用程序属性的外部文件夹。

But in JBOSS 7 since the loading is based on JBOSS module project, the external properties configuration is different.

但是在 JBOSS 7 中，由于加载是基于 JBOSS 模块项目，外部属性配置是不同的。

You can try configuring/loading the properties file in JBOSS 7 in below two ways,

您可以尝试通过以下两种方式在 JBOSS 7 中配置/加载属性文件，

1. Prepare jar having all the property files required for your app. Use this jar in your war/ear.

   Then any property file from this jar can be loaded using below code,

   InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName) ;

2. The changes required in JBOSS 7 to specify external property files is available in community link https://community.jboss.org/wiki/HowToPutAnExternalFileInTheClasspath. If the changes are done according to this link, deployment will work. Make sure after configuration in JBOSS 7, the below code has to be used to load properties,

   InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("xyz.properties");

1. 准备具有应用程序所需的所有属性文件的 jar。在你的War/耳朵中使用这个罐子。

   然后可以使用以下代码加载此 jar 中的任何属性文件，

   InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);

2. JBOSS 7 中指定外部属性文件所需的更改可在社区链接https://community.jboss.org/wiki/HowToPutAnExternalFileInTheClasspath 中找到。如果根据此链接完成更改，则部署将起作用。确保在 JBOSS 7 中配置后，必须使用以下代码来加载属性，

   InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("xyz.properties");