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Maven package open a file (as a *File*) inside a jar package

开发者 https://www.devze.com 2023-01-27 06:54 出处:网络
I need to open a file which is inside a maven jar package. It a model configuration for a framework I use and a constructor of a library class requires to pass a object of type File. I can get a path

I need to open a file which is inside a maven jar package. It a model configuration for a framework I use and a constructor of a library class requires to pass a object of type File. I can get a path to a configuration file using class loader without any problems. But -- unfortunately -- File can not read a file inside jar. So I get java.io.FileNotFoundException. Now I looking for a solution for this problem. My plan is to decompress the model configuration file and place it in a temporary directory. However, before star开发者_开发问答ting coding, I would like to learn if there is any other solution for such a problem like mine.

UPDATE: I need to read a file in runtime.


If you're doing it from a maven build, unpack the jar resource to a file using

  • dependency:unpack-dependencies (if the jar is one of the project's maven dependenies)

    <plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-dependency-plugin</artifactId>
     <executions>
       <execution>
        <id>unpack-dependencies</id>
        <phase>generate-resources</phase>
        <goals>
          <goal>unpack-dependencies</goal>
        </goals>
        <configuration>
          <includeGroupIds>the.groupId</includeGroupIds>
          <includeArtifactIds>the.artifactId</includeArtifactIds>
          <includes>**/path/to/your/resource.txt</includes>
          <outputDirectory>where/do/you/want/it</outputDirectory>
        </configuration>
      </execution>
     </executions>
    </plugin>
    

or use

  • dependency:unpack (if the jar is no dependency, but still available as a maven artifact)

    <plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-dependency-plugin</artifactId>
     <executions>
       <execution>
         <id>unpack</id>
         <phase>generate-resources</phase>
         <goals>
           <goal>unpack</goal>
         </goals>
         <configuration>
           <artifactItems>
             <artifactItem>
               <groupId>the.groupid</groupId>
               <artifactId>the.artifactid</artifactId>
               <version>the.version</version>
               <type>jar</type>
               <outputDirectory>where/do/you/want/it</outputDirectory>
               <includes>**/path/to/your/resource.txt</includes>
             </artifactItem>
           </artifactItems>
         </configuration>
       </execution>
     </executions>
    </plugin>
    


I think you should use JarInputStream, traversing through JAR entries one by one, until you find what you need. Then just read() content of the found JarEntry.

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