pom中不包含任何引用的情况下，只需要在pom中添加 maven-jar-plugin即可。
解决过程
新建项目，仅包含一个main函数类：xixi.java，输出 xixi say: hello
pom中配置为
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<groupid>com.paxi</groupid>
<artifactid>xixi</artifactid>
<version>1.0-snapshot</version>
<packaging>jar</packaging>
<name>xixi</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceencoding>utf-8</project.build.sourceencoding>
</properties>
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执行 mvn clean install 生成jar包 xixi-1.0-snapshot.jar,执行jar命令,执行反馈出错
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java -jar xixi-1.0-snapshot.jar
xixi-1.0-snapshot.jar中没有主清单属性
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对jar进行解压缩jar xvf xixi-1.0-snapshot.jar查看对应文件manifest.mf
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cat meta-inf/manifest.mf
manifest-version: 1.0
archiver-version: plexus archiver
built-by: paxi
created-by: apache maven 3.3.3
build-jdk: 1.8.0_121
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在pom中添加插件 maven-jar-plugin
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<build>
<plugins>
<plugin>
<groupid>org.apache.maven.plugins</groupid>
<artifactid>maven-jar-plugin</artifactid>
<version>3.1.0</version>
<configuration>
<archive>
<manifest>
<mainclass>com.paxi.xixi</mainclass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
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执行成功输出
java -jar xixi-1.0-snapshot.jar
xixi say: hello
再对解压缩后的manifest.mf文件查看为
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cat meta-inf/manifest.mf
manifest-version: 1.0
built-by: paxi
created-by: apache maven 3.3.3
build-jdk: 1.8.0_121
main-class: com.paxi.xixi //新增
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在pom中添加依赖，maven如何生成可执行jar?
需要使用插件maven-dependency-plugin 和 maven-jar-plugin。
解决过程
在pom中仅仅增加一个apache-commons包
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<groupid>com.paxi</groupid>
<artifactid>xixi</artifactid>
<version>1.0-snapshot</version>
<packaging>jar</packaging>
<name>xixi</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceencoding>utf-8</project.build.sourceencoding>
</properties>
<dependencies>
<dependency>
<groupid>org.apache.commons</groupid>
<artifactid>commons-lang3</artifactid>
<version>3.7</version>
</dependency>
</dependencies>
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在代码中运用common包中的一个类
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public static void main(string[] args) {
string words = "xixi say: hello";
if (stringutils.isnotblank(words))
{
system.out.println(words);
}
}
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打包后直接运行出错
java -jar xixi-1.0-snapshot.jar
exception in thread "main" java.lang.noclassdeffounderror: org/apache/commons/lang3/stringutils
at com.paxi.xixi.main(xixi.java:11)
caused by: java.lang.classnotfoundexception: org.apache.commons.lang3.stringutils
at java.net.urlclassloader.findclass(urlclassloader.java:381)
at java.lang.classloader.loadclass(classloader.java:424)
at sun.misc.launcher$appclassloader.loadclass(launcher.java:331)
at java.lang.classloader.loadclass(classloader.java:357)
... 1 more
在pom中增加插件
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<build>
<plugins>
<plugin>
<groupid>org.apache.maven.plugins</groupid>
<artifactid>maven-jar-plugin</artifactid>
<version>3.1.0</version>
<configuration>
<archive>
<manifest>
<addclasspath>true</addclasspath>
<mainclass>com.paxi.xixi</mainclass>
<classpathprefix>libs/</classpathprefix>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupid>org.apache.maven.plugins</groupid>
<artifactid>maven-dependency-plugin</artifactid>
<version>3.1.1</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputdirectory>
${project.build.directory}/libs
</outputdirectory>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
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再次运行
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java -jar xixi-1.0-snapshot.jar
xixi say: hello
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manifest.mf文件为
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cat meta-inf/manifest.mf
manifest-version: 1.0
built-by: paxi
class-path: libs/commons-lang3-3.7.jar
created-by: apache maven 3.3.3
build-jdk: 1.8.0_121
main-class: com.paxi.xixi
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不仅使用了pom中的依赖还使用了三方的jar,maven如何生成可执行jar?
编译过程需要对编译插件 maven-compiler-plugin做修改，运行的时候需要加上三方jar的目录，执行命令
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java -jar -djava.ext.dirs=lib/ target/xixi-1.0-snapshot.jar
xixi say: hello
papa say:hello
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编译解决过程
测试代码为
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public static void main(string[] args) {
string words = "xixi say: hello";
if (stringutils.isnotblank(words))
{
system.out.println(words);
}
papa.say();
}
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使用mvn命令执行报错
[error] failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project xixi: compilation failure
xixi/src/main/java/com/paxi/xixi.java:[15,9] 找不到符号
pom中添加编译插件
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<plugin>
<groupid>org.apache.maven.plugins</groupid>
<artifactid>maven-compiler-plugin</artifactid>
<version>3.1</version>
<configuration>
<compilerargs>
<arg>-djava.ext.dirs=lib/</arg>
</compilerargs>
</configuration>
</plugin>
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打包执行
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java -jar target/xixi-1.0-snapshot.jar
xixi say: hello
exception in thread "main" java.lang.noclassdeffounderror: com/paxi/papa
at com.paxi.xixi.main(xixi.java:15)
caused by: java.lang.classnotfoundexception: com.paxi.papa
at java.net.urlclassloader.findclass(urlclassloader.java:381)
at java.lang.classloader.loadclass(classloader.java:424)
at sun.misc.launcher$appclassloader.loadclass(launcher.java:331)
at java.lang.classloader.loadclass(classloader.java:357)
... 1 more
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加上参数后即可得出结果
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java -jar -djava.ext.dirs=lib/ target/xixi-1.0-snapshot.jar
xixi say: hello
papa say:hello
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://segmentfault.com/a/1190000015372200