导出 jar 包的几种方式（命令行、Idea、Eclipse）

要单独将一个处理器类导出为 jar 包，除了用 Eclipse，用 jar 命令和 maven 打包也是很方便的。本文介绍了导出 Jar 包的几种方式。

第一种，使用 Eclipse 的 Export 功能

• 新建 lib 目录放入第三方 jar 包，然后点击 Add to Path
• 在类的 java 文件上右键 Export 选择导出 Jar 包

第二种，使用 mvn package 命令

首先将使用到的第三方 jar 包安装到 Maven 本地仓库：

  yan  ~/Downloads  mvn install:install-file -Dfile=bfw-api-1.3.1.jar -DgroupId=com.bamboocloud -DartifactId=bfw-api-1.3.1 -Dversion=1.3.1 -Dpackaging=jar
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< org.apache.maven:standalone-pom >-------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] --- maven-install-plugin:2.4:install-file (default-cli) @ standalone-pom ---
[INFO] Installing /Users/yan/Downloads/bfw-api-1.3.1.jar to /Users/yan/.m2/repository/com/bamboocloud/bfw-api-1.3.1/1.3.1/bfw-api-1.3.1-1.3.1.jar
[INFO] Installing /var/folders/bp/qj5wrpcx2vldm47jrf2pwhg00000gn/T/mvninstall4925133153419211597.pom to /Users/yan/.m2/repository/com/bamboocloud/bfw-api-1.3.1/1.3.1/bfw-api-1.3.1-1.3.1.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.311 s
[INFO] Finished at: 2020-08-23T01:20:17+08:00
[INFO] ------------------------------------------------------------------------
  yan  ~/Downloads 
  yan  ~/Downloads  mvn install:install-file -Dfile=bim-api-6.5.0.jar -DgroupId=com.bamboocloud -DartifactId=bim-api-6.5.0 -Dversion=6.5.0 -Dpackaging=jar
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< org.apache.maven:standalone-pom >-------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] --- maven-install-plugin:2.4:install-file (default-cli) @ standalone-pom ---
[INFO] Installing /Users/yan/Downloads/bim-api-6.5.0.jar to /Users/yan/.m2/repository/com/bamboocloud/bim-api-6.5.0/6.5.0/bim-api-6.5.0-6.5.0.jar
[INFO] Installing /var/folders/bp/qj5wrpcx2vldm47jrf2pwhg00000gn/T/mvninstall7064391259515368380.pom to /Users/yan/.m2/repository/com/bamboocloud/bim-api-6.5.0/6.5.0/bim-api-6.5.0-6.5.0.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.398 s
[INFO] Finished at: 2020-08-23T01:18:54+08:00
[INFO] ------------------------------------------------------------------------
  yan  ~/Downloads 

• 在 Idea 设置中找到 Maven 设置，点击进入仓库更新本地仓库，这样可以在 pom.xml 文件中有代码补全自动提示

然后在 pom.xml 中引用安装在本地仓库的 jar 包

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <!-- 指定 java 版本号以解决 Maven 编译 Error:
    [ERROR] 不再支持源选项 5。请使用 7 或更高版本。
    [ERROR] 不再支持目标选项 5。请使用 7 或更高版本。 -->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
        <java.version>8</java.version>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <groupId>com.bamboocloud</groupId>
    <artifactId>BCJavaHandler</artifactId>
    <version>1.0-SNAPSHOT</version>


    <dependencies>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.8</version>
        </dependency>

<!--        安装到 Maven 本地仓库的 jar 包 -->
        <dependency>
            <groupId>com.bamboocloud</groupId>
            <artifactId>bfw-api-1.3.1</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>com.bamboocloud</groupId>
            <artifactId>bim-api-6.5.0</artifactId>
            <version>6.5.0</version>
        </dependency>


    </dependencies>

</project>

然后进入项目根目录，打包

  yan  ~/IdeaProjects/BCJavaHandler  mvn clean  
[INFO] Scanning for projects...
[INFO]
[INFO] -------------------< com.bamboocloud:BCJavaHandler >--------------------
[INFO] Building BCJavaHandler 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ BCJavaHandler ---
[INFO] Deleting /Users/yan/IdeaProjects/BCJavaHandler/target
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.264 s
[INFO] Finished at: 2020-08-23T01:32:04+08:00
[INFO] ------------------------------------------------------------------------
  yan  ~/IdeaProjects/BCJavaHandler  mvn package
[INFO] Scanning for projects...
[INFO]
[INFO] -------------------< com.bamboocloud:BCJavaHandler >--------------------
[INFO] Building BCJavaHandler 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ BCJavaHandler ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ BCJavaHandler ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to /Users/yan/IdeaProjects/BCJavaHandler/target/classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ BCJavaHandler ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/yan/IdeaProjects/BCJavaHandler/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ BCJavaHandler ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ BCJavaHandler ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ BCJavaHandler ---
[INFO] Building jar: /Users/yan/IdeaProjects/BCJavaHandler/target/BCJavaHandler-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  1.789 s
[INFO] Finished at: 2020-08-23T01:32:08+08:00
[INFO] ------------------------------------------------------------------------
  yan  ~/IdeaProjects/BCJavaHandler  ll
total 16
-rw-r--r--  1 yan  staff    80B  8 23 01:07 BCJavaHandler.iml
-rw-r--r--  1 yan  staff   1.4K  8 23 01:31 pom.xml
drwxr-xr-x  4 yan  staff   128B  8 23 01:07 src
drwxr-xr-x  8 yan  staff   256B  8 23 01:34 target
  yan  ~/IdeaProjects/BCJavaHandler  cd target
  yan  ~/IdeaProjects/BCJavaHandler/target  ll
total 8
-rw-r--r--@ 1 yan  staff   3.0K  8 23 01:32 BCJavaHandler-1.0-SNAPSHOT.jar
drwxr-xr-x  4 yan  staff   128B  8 23 01:52 classes
drwxr-xr-x  3 yan  staff    96B  8 23 01:32 generated-sources
drwxr-xr-x  3 yan  staff    96B  8 23 01:32 maven-archiver
drwxr-xr-x  3 yan  staff    96B  8 23 01:32 maven-status

第三种，使用 jar -cf 命令

找到 class 所在目录，进入与包名一级的目录，使用 jar 命令创建 jar 包

  yan  ~/IdeaProjects/BCJavaHandler  cd target/classes/
  yan  ~/IdeaProjects/BCJavaHandler/target/classes  ll
total 0
drwxr-xr-x  3 yan  staff    96B  8 23 01:32 com
  yan  ~/IdeaProjects/BCJavaHandler/target/classes  jar -cf convert_test_v0.1_jar.jar com
  yan  ~/IdeaProjects/BCJavaHandler/target/classes  ll
total 8
drwxr-xr-x  3 yan  staff    96B  8 23 01:32 com
-rw-r--r--  1 yan  staff   1.7K  8 23 01:52 convert_test_v0.1_jar.jar