Onejar和资源加载 [英] Onejar and resource loading

问题描述

我有一个Maven项目，我想将其打包到一个可执行jar中. 它使用了很多依赖项，例如spring等. 在一些帖子中建议使用OneJar，以避免造成很多麻烦. 这是我目前在pom.xml中所拥有的:

I have a maven project which I would like to package in an executable jar. It's using quite a few dependencies, like spring and so on. It was suggested in a few posts to use OneJar, to avoid a lot of headaches. This is what I have currently in my pom.xml:

        <plugin>
            <groupId>org.dstovall</groupId>
            <artifactId>onejar-maven-plugin</artifactId>
            <version>1.4.4</version>
            <executions>
                <execution>
                    <configuration>
                        <mainClass>com.cool.project.Application</mainClass>
                        <onejarVersion>0.97</onejarVersion>
                        <attachToBuild>true</attachToBuild>
                        <classifier>coolproject</classifier>
                    </configuration>
                    <goals>
                        <goal>one-jar</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

在我的Spring配置中，其中一个类需要将资源(src/main/resources/coolfile.bin)路径传递给外部库(jsch)方法:

In my Spring configuration one of the classes needs to pass the a resource (src/main/resources/coolfile.bin) path to an external library (jsch) method:

String resource = ConfigurationClass.class.getClassLoader().getResource("coolfile.bin").getFile();
jsch.addIdentity(resource);

当我从IDE(Eclipse)运行Application.java时，整个应用程序成功加载.

When I run Application.java from the IDE (eclipse), the entire application loads successfully.

尽管当我运行mvn clean install时，onejar jar是在target文件夹下构建的，但是当我尝试使用java -jar coolproject.one-jar.jar运行它时，会显示以下错误:

Although when I run mvn clean install, the onejar jar is built under the target folder, but when I try to run it with java -jar coolproject.one-jar.jar the following error is displayed:

...
Caused by: java.io.FileNotFoundException: file:/target/coolproject.one-jar.jar!/main/coolproject.jar!/coolfile.bin (No such file or directory)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.io.FileInputStream.<init>(FileInputStream.java:97)
    at com.jcraft.jsch.IdentityFile.newInstance(IdentityFile.java:83

如果我检查coolproject.one-jar.jar，则可以在main文件夹下找到coolproject.jar，如果我检查了它，则可以在其根目录中看到coolfile.bin.

If I inspect coolproject.one-jar.jar, I can find the coolproject.jar under the main folder, and if I inspect that, I can see coolfile.bin in its root.

因此，从理论上讲应该找到资源?我想念什么?

So in theory the resource should be found? What am I missing?

推荐答案

事实证明，FileInputStream找不到由resource指定的路径. 幸运的是，jsch提供了另一种方法，您可以在其中传递文件的字节数组而不是其位置:

Turns out that FileInputStream would not find the path specified by resource. Luckily jsch provides another method where you can pass the byte array of the file rather than its location:

jsch.addIdentity("coolfile.bin", toByteArray(ConfigurationClass.class.getResourceAsStream("/coolfile.bin")), null, null);

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