可执行的jar文件

参考文档

https://skife.org/java/unix/2011/06/20/really_executable_jars.html

原理

• jar文件本质是属于zip格式压缩包
• zip包有个hack,可以在zip文件头部插入任意的文件行(前提没有zip文件格式关键字符)
• 利用 exec java -jar 0"@”

其中 0标示执行文件名，也就是原来的jar包名称，@表示所有参与原封不动透传给 jar -jar $0.

流程，先生成一个./waffles文件，里面内容为(下面为16进制ascii dumphex的结果)

0000000   #   !   /   b   i   n   /   s   h  \n  \n   e   x   e   c0000010   j   a   v   a       -   X   m   x   1   G       -   j   a   r0000020       "   $   0   "       "   $   @   "  \n  \n

记得末尾必须有换行。

然后把jar包字节追加在waffles文件末尾即可：

$ cat ./waffles-1.2.3.jar >> ./waffles$ chmod +x ./waffles$ ./waffles --some-flag=blue hello

maven的插件

https://github.com/brianm/really-executable-jars-maven-plugin

<!-- You need to build an exectuable uberjar, I like Shade for that --><plugin> <!-- 第一步，生成的jar包里面 MANIFEST.MF 指定main class--->    <groupId>org.apache.maven.plugins</groupId>    <artifactId>maven-shade-plugin</artifactId>     <version>2.0</version>    <executions>        <execution>            <phase>package</phase>            <goals>                <goal>shade</goal>            </goals>            <configuration>                <transformers>                    <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>                    <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">                        <!-- note that the main class is set *here* -->                        <mainClass>com.example.Main</mainClass>                    </transformer>                </transformers>                <createDependencyReducedPom>false</createDependencyReducedPom>                <filters>                    <filter>                        <artifact>*:*</artifact>                        <excludes>                            <exclude>META-INF/*.SF</exclude>                            <exclude>META-INF/*.DSA</exclude>                            <exclude>META-INF/*.RSA</exclude>                        </excludes>                    </filter>                </filters>            </configuration>        </execution>    </executions></plugin><!-- now make the jar chmod +x style executable --><plugin> <!-- 第二步，really-executable-jar-maven-plugin 生成可以直接执行的文件-->  <groupId>org.skife.maven</groupId>  <artifactId>really-executable-jar-maven-plugin</artifactId>  <version>1.4.1</version>  <configuration>    <!-- value of flags will be interpolated into the java invocation -->    <!-- as "java $flags -jar ..." -->    <flags>-Xmx1G</flags>    <!-- (optional) name for binary executable, if not set will just -->    <!-- make the regular jar artifact executable -->    <programFile>nifty-executable</programFile>    <!-- (optional) support other packaging formats than jar -->    <!-- <allowOtherTypes>true</allowOtherTypes> -->    <!-- (optional) name for a file that will define what script gets -->    <!-- embedded into the executable jar.  This can be used to -->    <!-- override the default startup script which is -->    <!-- `#!/bin/sh -->    <!--            -->    <!-- exec java " + flags + " -jar "$0" "$@" -->    <!-- <scriptFile>src/packaging/someScript.extension</scriptFile> -->  </configuration>  <executions>    <execution>      <phase>package</phase>      <goals>        <goal>really-executable-jar</goal>      </goals>    </execution>  </executions></plugin>