java用外部jar文件构建ant文件 [英] java build ant file with external jar files

问题描述

我创建了一个 ant 构建文件来将我的 java src 编译成一个 .jar 文件.它使用外部 jar 文件.

I created an ant build file to compile my java src into a .jar file. It uses external jar files.

我的文件目录:

+src
----android
------------Address.java
------------HelloServer.java
------------HelloServerResource.java
+lib
------------org.codehaus.jackson.core.jar
------------org.codehaus.jackson.mapper.jar
------------org.json.jar
------------org.restlet.ext.jackson.jar
------------org.restlet.jar
build.xml

外部库位于 lib 文件夹中.主类在HelloServer.java

The external libraries are in lib folder. The main class is in HelloServer.java

这是我的 ant 构建文件:

Here is my ant build file:

<project name="helloworld">
    <property name="src-dir" location="src"/>
    <property name="build-dir" location="build"/>
    <property name="classes-dir" value="${build-dir}/classes"/>
    <property name="dist-dir" location="dist"/>
    <property name="lib-dir" value="lib"/>
    <property name="jar-dir"     value="${build-dir}/jar"/>
    <property name="main-class"  value="android.HelloServer"/>

    <path id="classpath">
        <fileset dir="${lib-dir}" includes="**/*.jar"/>
    </path>

    <target name="clean" description="compile the source">
        <delete dir="${build-dir}" />
        <delete dir="${dist-dir}" />
    </target>

    <target name="cleanall" depends="clean"/>

    <target name="init">
        <!-- Create the build directory structure used by compile -->
        <mkdir dir="${build-dir}"/>
        <mkdir dir="${classes-dir}"/>
        <mkdir dir="${jar-dir}"/>
        <!--<mkdir dir="${dist-dir}"/>-->
    </target>

    <target name="compile" depends="init" description="compile the source " >
        <javac srcdir="${src-dir}" destdir="${classes-dir}" classpathref="classpath" includeantruntime="false" />
        <!--<javac srcdir="${src-dir}" destdir="${build-dir}"/>-->
    </target>

    <target name="jar" depends="compile">
        <jar destfile="${jar-dir}/${ant.project.name}.jar" basedir="${classes-dir}">
            <manifest>
                <attribute name="Main-Class" value="${main-class}"/>
            </manifest>
        </jar>
    </target>

    <target name="run" depends="jar">
        <java fork="true" classname="${main-class}">
            <classpath>
                <path refid="classpath"/>
                <path location="${jar-dir}/${ant.project.name}.jar"/>
            </classpath>
        </java>
    </target>

</project>

我执行 run 并且所有目录都成功创建，.jar 文件已创建并且可以执行.

I execute run and all the dirs were created successfully, the .jar file was created and it was able to be executed.

我打开终端并转到 jar 目录.我试图通过这样的命令行执行，它给了我以下错误:

I open terminal and go to the jar dir. I tried to execute through command line like this and it gave me the following error:

$java -jar helloworld.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/restlet/Server
    at android.HelloServer.main(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.restlet.Server
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    ... 1 more

为什么说找不到类文件?我认为通过创建 helloworld jar 文件，我实际上包含了外部库.

Why does it say class file not found? I thought by creating the helloworld jar file, i actually included the external libraries.

推荐答案

您需要使用 zipgroupfileset 将所有 jar 组合在一起:

You'll need to combine all the jars together using zipgroupfileset:

<target name="jar" depends="compile">
    <jar destfile="${jar-dir}/${ant.project.name}.jar" basedir="${classes-dir}">
        <manifest>
            <attribute name="Main-Class" value="${main-class}"/>
        </manifest>
        <zipgroupfileset dir="${lib-dir}" includes="*.jar"/>
    </jar>
</target>

请参阅:使用 ant 创建捆绑 jar

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