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
|
1
2
3
4
5
6
7
8
9
10
11
|
<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> |
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
|
1
2
|
java -jar xixi-1.0-snapshot.jarxixi-1.0-snapshot.jar中没有主清单属性 |
对jar进行解压缩jar xvf xixi-1.0-snapshot.jar查看对应文件manifest.mf
|
1
2
3
4
5
6
|
cat meta-inf/manifest.mfmanifest-version: 1.0archiver-version: plexus archiverbuilt-by: paxicreated-by: apache maven 3.3.3build-jdk: 1.8.0_121 |
在pom中添加插件 maven-jar-plugin
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
<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> |
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
|
1
2
3
4
5
6
|
cat meta-inf/manifest.mfmanifest-version: 1.0built-by: paxicreated-by: apache maven 3.3.3build-jdk: 1.8.0_121main-class: com.paxi.xixi //新增 |
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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
<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> |
在代码中运用common包中的一个类
|
1
2
3
4
5
6
7
|
public static void main(string[] args) { string words = "xixi say: hello"; if (stringutils.isnotblank(words)) { system.out.println(words); } } |
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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
<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> ${project.build.directory}/libs </outputdirectory> </configuration> </execution> </executions> </plugin> </plugins> </build> |
再次运行
|
1
2
|
java -jar xixi-1.0-snapshot.jarxixi say: hello |
manifest.mf文件为
|
1
2
3
4
5
6
7
|
cat meta-inf/manifest.mfmanifest-version: 1.0built-by: paxiclass-path: libs/commons-lang3-3.7.jarcreated-by: apache maven 3.3.3build-jdk: 1.8.0_121main-class: com.paxi.xixi |
不仅使用了pom中的依赖还使用了三方的jar,maven如何生成可执行jar?
编译过程需要对编译插件 maven-compiler-plugin做修改，运行的时候需要加上三方jar的目录，执行命令
|
1
2
3
|
java -jar -djava.ext.dirs=lib/ target/xixi-1.0-snapshot.jarxixi say: hellopapa say:hello |
编译解决过程
测试代码为
|
1
2
3
4
5
6
7
8
|
public static void main(string[] args) { string words = "xixi say: hello"; if (stringutils.isnotblank(words)) { system.out.println(words); } papa.say(); } |
使用mvn命令执行报错
[error] failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project xixi: compilation failure
xixi/src/main/java/com/paxi/xixi.java:[15,9] 找不到符号
pom中添加编译插件
|
1
2
3
4
5
6
7
8
9
10
|
<plugin> <groupid>org.apache.maven.plugins</groupid> <artifactid>maven-compiler-plugin</artifactid> <version>3.1</version> <configuration> <compilerargs> <arg>-djava.ext.dirs=lib/</arg> </compilerargs> </configuration> </plugin> |
打包执行
|
1
2
3
4
5
6
7
8
9
10
|
java -jar target/xixi-1.0-snapshot.jarxixi say: helloexception in thread "main" java.lang.noclassdeffounderror: com/paxi/papa at com.paxi.xixi.main(xixi.java:15)caused by: java.lang.classnotfoundexception: com.paxi.papa at java.net.urlclassloader.findclass(urlclassloader.java:381) at java.lang.classloader.loadclass(classloader.java:424) at sun.misc.launcher$appclassloader.loadclass(launcher.java:331) at java.lang.classloader.loadclass(classloader.java:357) ... 1 more |
加上参数后即可得出结果
|
1
2
3
|
java -jar -djava.ext.dirs=lib/ target/xixi-1.0-snapshot.jarxixi say: hellopapa say:hello |
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
