包含MANIFEST.MF的jar可执行应用指定classpath及spring boot应用增量升级打包实现

对于不包含MANIFEST.MF，或jar包中的MANIFEST.MF未指定MainClass的jar，可以通过java命令行选项-classpath指定classpath。但是如果是包含MainClass的jar，例如：

Manifest-Version: 1.0
Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt
Bundle-SymbolicName: org.mybatis.generator.mybatis-generator-core
Archiver-Version: Plexus Archiver
Built-By: zjhua
Bnd-LastModified: 1559632976998
Specification-Title: MyBatis Generator Core
Implementation-Vendor-Id: org.mybatis.generator
Bundle-DocURL: http://www.mybatis.org/mybatis-generator/mybatis-genera
tor-core/
Include-Resource: org/mybatis/generator/config/xml/ibator-config_1_0.d
td=src/main/resources/org/mybatis/generator/config/xml/ibator-config_
1_0.dtd,org/mybatis/generator/config/xml/mybatis-generator-config_1_0
.dtd=src/main/resources/org/mybatis/generator/config/xml/mybatis-gene
rator-config_1_0.dtd,org/mybatis/generator/internal/util/messages/mes
sages.properties=src/main/resources/org/mybatis/generator/internal/ut
il/messages/messages.properties
Import-Package: com.mysql.jdbc,javax.xml.parsers,org.apache.commons.la
ng3,org.apache.log4j,org.apache.tools.ant,org.apache.tools.ant.types,
org.w3c.dom,org.xml.sax
Require-Capability: osgi.ee;filter:="(&(osgi.ee=JavaSE)(version=1.6))"
Main-Class: org.mybatis.generator.api.ShellRunner
Implementation-Build-Date: 2019-06-04 07:22:46+0000

其classpath可以通过maven打包插件指定，如下：

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-jar-plugin</artifactId>

                <configuration>

                    <archive>

                        <manifest>

                            <addClasspath>true</addClasspath>

                            <classpathPrefix>lib/</classpathPrefix>

                            <mainClass>com.xxx.uploadFile</mainClass>

                        </manifest>

                    </archive>

                </configuration>

            </plugin>

这样和jar文件在同一目录的lib/下的所有jar就都是能够访问到了。

然后我们通过maven-dependency-plugin插件将特定的包拷贝到lib目录，如下：

<plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-dependency-plugin</artifactId>

                <version>3.0.1</version>

                <executions>

                    <execution>

                        <id>copy</id>

                        <phase>package</phase>

                        <goals>

                            <goal>copy</goal>

                        </goals>

                        <configuration>

                            <artifactItems>

                                <artifactItem>

                                    <groupId>junit</groupId>

                                    <artifactId>junit</artifactId>

                                    <version>4.11</version>

                                    <outputDirectory>${project.build.directory}/lib/lib1</outputDirectory>

                                </artifactItem>

                                <artifactItem>

                                    <groupId>org.slf4j</groupId>

                                    <artifactId>slf4j-log4j12</artifactId>

                                    <version>1.7.7</version>

                                    <outputDirectory>${project.build.directory}/lib/lib1</outputDirectory>

                                </artifactItem>

                            </artifactItems>

                        </configuration>

                    </execution>

                </executions>

            </plugin>

也可以拷贝所有依赖，如下：

 <plugin>

            <groupId>org.apache.maven.plugins</groupId>

            <artifactId>maven-dependency-plugin</artifactId>

            <executions>

                <execution>

                    <id>copy-dependencies</id>

                    <phase>prepare-package</phase>

                    <goals>

                        <goal>copy-dependencies</goal>

                    </goals>

                    <configuration>

                        <outputDirectory>${project.build.directory}/lib</outputDirectory>

                        <overWriteReleases>false</overWriteReleases>

                        <overWriteSnapshots>false</overWriteSnapshots>

                        <overWriteIfNewer>true</overWriteIfNewer>

                    </configuration>

                </execution>

            </executions>

        </plugin>

实际情况是我们通常希望基础三方库打到包中，应用jar拷贝到lib目录，同时兼顾易升级和管理复杂性，所以最终是这样的。

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <configuration>

                    <layout>ZIP</layout>

                    <mainClass>org.abc.ConsumerStarter</mainClass>

                    <excludes>

                        <exclude>

                            <groupId>abc.org</groupId>

                            <artifactId>biz-service</artifactId>

                        </exclude>

                    </excludes>

                    <includeSystemScope>true</includeSystemScope>

                </configuration>

                <executions>

                    <execution>

                        <goals>

                            <goal>repackage</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-dependency-plugin</artifactId>

                <version>3.1.1</version>

                <executions>

                    <execution>

                        <id>copy</id>

                        <phase>package</phase>

                        <goals>

                            <goal>copy</goal>

                        </goals>

                        <configuration>

                            <artifactItems>

                                <artifactItem>

                                    <groupId>abc.org</groupId>

                                    <artifactId>biz-service</artifactId>

                                    <version>1.1.0</version>

                                    <outputDirectory>${project.build.directory}/lib</outputDirectory>

                                </artifactItem>

                            </artifactItems>

                        </configuration>

                    </execution>

                </executions>

            </plugin>

这样打出来的jar就不包含biz-service，在单独的lib目录中。结合layout ZIP特性，就可以完美实现增量升级。

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包含MANIFEST.MF的jar可执行应用指定classpath及spring boot应用增量升级打包实现

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