Spring Boot添加本地jar包
打包./lib/llw-base-rpc.jar到jar包中。
<dependencies>
<dependency>
<groupId>llw-base-rpc</groupId>
<artifactId>llw-base-rpc</artifactId>
<version>1.0</version>
<scope>system</scope>
<systemPath>${project.basedir}/lib/llw-base-rpc.jar</systemPath>
</dependency>
</dependencies>
把includeSystemScope属性设置成true。
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
<compilerArguments>
<extdirs>${project.basedir}/lib</extdirs>
</compilerArguments>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<includeSystemScope>true</includeSystemScope>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
<targetPath>BOOT-INF/lib/</targetPath>
<includes>
<include>**/*.jar</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<targetPath>BOOT-INF/</targetPath>
<includes>
<include>**/*.properties</include>
</includes>
</resource>
</resources>
</build>
Spring Boot修改默认Logback替换为log4j
1) 去除对默认日志的依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<!-- 去除对默认日志的依赖 -->
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
2) 添加对log4j的依赖
<!-- 添加 log4j 依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j</artifactId>
<version>1.3.8.RELEASE</version>
</dependency>
<!-- 或添加如下依赖 -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.6.2</version>
</dependency>
到此，Spring Boot项目的日志框架就以及替换成log4j了，如需要定义日志输出，只需添加log4j.properties文件并添加相应配置即可。
然后需要去除项目中其他依赖中引入的logback-classic包，Maven Projects -> Dependencies可以看到pom.xml中每一个
<exclusions>
<exclusion>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
</exclusion>
<exclusion>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
</exclusion>
</exclusions>
如图所示：
Maven在MANIFEST.MF文件中的Class-Path添加指定路径。
添加manifestEntries
<build>
<resources>
<!--指定src/main/resources资源要过滤-->
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<!-- 可执行jar插件 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>com.dongwei.test.Main</mainClass>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
</manifest>
<manifestEntries>
<Class-Path>/usr/lib/phoenix/</Class-Path>
</manifestEntries>
</archive>
</configuration>
</plugin>
<!-- maven资源文件复制插件 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.7</version>
<executions>
<execution>
<id>copy-resources</id>
<!-- here the phase you need -->
<phase>package</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/etc</outputDirectory>
<resources>
<resource>
<directory>src/main/resources</directory>
<includes>
<exclude>**/*.xml</exclude>
<exclude>**/*.conf</exclude>
<exclude>**/*.properties</exclude>
</includes>
<filtering>true</filtering>
</resource>
</resources>
<encoding>UTF-8</encoding>
</configuration>
</execution>
</executions>
</plugin>
<!-- 依赖包插件 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/etc/lib</outputDirectory>
<!-- 是否不包含间接依赖 -->
<excludeTransitive>false</excludeTransitive>
<!-- 忽略版本 -->
<stripVersion>false</stripVersion>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
添加后的效果
Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: wei.dong
Build-Jdk: 1.6.0_24
Main-Class: com.dongwei.test.Main
Class-Path: /usr/lib/phoenix/ lib/spring-core-3.0.5.RELEASE.jar lib/spring-asm-3.0.5.R
ELEASE.jar lib/commons-logging-1.1.1.jar lib/spring-context-3.0.5.REL
EASE.jar lib/spring-aop-3.0.5.RELEASE.jar lib/aopalliance-1.0.jar lib
/spring-expression-3.0.5.RELEASE.jar lib/spring-context-support-3.0.5
.RELEASE.jar lib/spring-beans-3.0.5.RELEASE.jar lib/spring-jdbc-3.0.5
.RELEASE.jar lib/spring-tx-3.0.5.RELEASE.jar lib/log4j-1.2.14.jar lib
/slf4j-nop-1.4.3.jar lib/slf4j-api-1.4.3.jar lib/commons-lang-2.5.jar
lib/commons-dbcp-1.2.2.jar lib/commons-pool-1.3.jar lib/commons-io-1
.4.jar lib/commons-digester-2.0.jar lib/commons-beanutils-1.8.0.jar l
ib/commons-configuration-1.6.jar lib/commons-collections-3.2.1.jar li
b/commons-beanutils-core-1.8.0.jar lib/quartz-1.8.4.jar lib/jta-1.1.j
ar lib/mysql-connector-java-5.1.12.jar
将Maven项目打包成可执行jar文件，配置文件打包在jar包外
- mvn package (一个jar包和一个lib文件夹)
<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <version>2.4</version> <configuration> <archive> <manifest> <addClasspath>true</addClasspath> <classpathPrefix>lib/</classpathPrefix> <mainClass>com.tang.CSVUtils</mainClass> </manifest> </archive> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>copy</id> <phase>package</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <outputDirectory>${project.build.directory}/lib</outputDirectory> </configuration> </execution> </executions> </plugin> </plugins> </build>其中lib就是第三方jar包的目录，只需拷贝两个（lib和testLog4j-0.1.jar）即可放到其他地方用了。
- mvn package (推荐)(一个zip包，里面有一个jar包，一个lib文件夹和一个conf文件夹)
conf/package.xml(conf文件夹和pom.xml在同一级目录)
<assembly> <id>bin</id> <!-- 最终打包成一个用于发布的zip文件 --> <formats> <format>zip</format> </formats> <!-- Adds dependencies to zip package under lib directory --> <dependencySets> <dependencySet> <!-- 不使用项目的artifact，第三方jar不要解压，打包进zip文件的lib目录 --> <useProjectArtifact>false</useProjectArtifact> <outputDirectory>lib</outputDirectory> <unpack>false</unpack> </dependencySet> </dependencySets> <fileSets> <!-- 把项目相关的说明文件，打包进zip文件的根目录 --> <fileSet> <directory>${project.basedir}</directory> <outputDirectory>/</outputDirectory> <includes> <include>README*</include> <include>LICENSE*</include> <include>NOTICE*</include> </includes> </fileSet> <!-- 把项目的配置文件，打包进zip文件的config目录 --> <fileSet> <directory>${project.basedir}\conf</directory> <outputDirectory>conf</outputDirectory> <includes> <include>*.xml</include> <include>*.properties</include> <include>*.key</include> </includes> </fileSet> <!-- 把项目的脚本文件目录（ src/main/scripts ）中的启动脚本文件，打包进zip文件的跟目录 --> <fileSet> <directory>${project.build.scriptSourceDirectory}</directory> <outputDirectory></outputDirectory> <includes> <include>startup.*</include> </includes> </fileSet> <!-- 把项目自己编译出来的jar文件，打包进zip文件的根目录 --> <fileSet> <directory>${project.build.directory}</directory> <outputDirectory></outputDirectory> <includes> <include>*.jar</include> </includes> </fileSet> </fileSets> </assembly>pom.xml
<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <compilerVersion>1.6</compilerVersion> <source>1.6</source> <target>1.6</target> </configuration> </plugin> <!-- The configuration of maven-jar-plugin --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <version>2.4</version> <!-- The configuration of the plugin --> <configuration> <!-- Configuration of the archiver --> <archive> <!-- do not include pom.xml and pom.properties in the jar package --> <addMavenDescriptor>false</addMavenDescriptor> <!-- Manifest specific configuration --> <manifest> <!-- put third party jar package into the classpath of manifest --> <addClasspath>true</addClasspath> <!-- the prefix of the jar items in the classpath, it depends on the location(folder) of jar files --> <classpathPrefix>lib/</classpathPrefix> <!-- main class of the jar package--> <mainClass>com.tang.your-Main-class</mainClass> </manifest> </archive> <!-- excludes some files --> <excludes> <exclude>${project.basedir}/xml/*</exclude> </excludes> </configuration> </plugin> <!-- The configuration of maven-assembly-plugin --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-assembly-plugin</artifactId> <version>2.4</version> <!-- The configuration of the plugin --> <configuration> <!-- Specifies the configuration file of the assembly plugin --> <descriptors> <descriptor>conf/package.xml</descriptor> </descriptors> </configuration> <executions> <execution> <id>make-assembly</id> <phase>package</phase> <goals> <goal>single</goal> </goals> </execution> </executions> </plugin> </plugins> </build>解压zip包后得到conf文件夹，lib文件夹，jar包。
Java虚拟机（JVM）寻找Class的顺序
1. Bootstrap classes
属于Java核心的class，如rt.jar，由JVM Bootstrap class loader来载入，一般放置在{java_home}/jre/lib目录下。
2. Extension classes
基于Java扩展机制，用来扩展Java核心功能模块，一般放置在{java_home}/jre/lib/ext目录下。
3. User classes
第三方java程序包，通过命令行-classpath或-cp，或者通过CLASSPATH环境变量来引用。 User class路径搜索的顺序、优先级如下：
- 缺省值，class所在当前目录。
- CLASSPATH环境变量设置的路径，CLASSPATH的值会覆盖缺省值。
- 命令行-classpath或-cp的值，如果使用了这两个命令行参数之一，它的值会覆盖环境变量CALSSPATH的值。
- 通过java -jar来运行一个可执行的jar包，则当前jar包会覆盖上面所有的值，换句话说-jar后面所跟的jar包的优先级别最高，如果指定了-jar选项，所有环境变量和命令行指定的搜索路径都将被忽略。JVM APPClassloader将只会以jar包为搜索范围，若想使用第三方jar包，需将第三方jar包路径写入jar包中MANIFEST.MF文件的Class-Path路径中。
添加第三方jar包的几种方法
Java定义了三种级别的class，分别为BootStrap class, Extend class, User class。
基于三种java不同级别的class扩展机制，有三种不同的方案：
-
BootStrap class扩展 Java 命令行提供了如何扩展bootStrap 级别class的简单方法.
-Xbootclasspath:基本核心的Java class 搜索路径.不常用,否则要重新写所有Java 核心class
-Xbootclasspath/a: 后缀在核心class搜索路径后面.常用.
-Xbootclasspath/p:前缀在核心class搜索路径前面.不常用,避免引起不必要的冲突.
语法如下: java –Xbootclasspath/a:/path/myclass/account.jar: -jar yourself.jar(Unix用:号隔开)
java –Xbootclasspath:/d:/myclass/account.jar; -jar yourself.jar(Window用;号隔开) -
Extend class扩展 Java exten class 存放在{Java_home}\jre\lib\ext 目录下.当调用Java时,对扩展class路径的搜索是自动的.总会搜索的.这样,解决的方案就很简单了,将所有要使用的第三方的jar包都复制到ext 目录下.
-
User class扩展
当使用-jar执行可执行Jar包时,JVM将Jar包所在目录设置为codebase目录,所有的class搜索都在这个目录下开始.所以如果使用了其他第三方的jar包,一个比较可以接受的可配置方案,就是利用jar包的Manifest扩展机制.步骤如下
1.将需要的第三方的jar包,复制在同可执行jar所在的目录或某个子目录下.
比如:jar 包在 d:\crm\luncher.jar 那么你可以把所有jar包复制到d:\crm目录下或d:\crm\lib 子目录下.
2.修改Manifest 文件
在Manifest.mf文件里加入如下行
Class-Path:classes12.jar lib/class12.jar
Class-Path 是可执行jar包运行依赖的关键词.详细内容可以参考http://java.sun.com/docs/books/tutorial/ext/index.html直接使用命令行模式来指定classpath以及要运行的main方法
windows:
java -cp “Test.jar;lib/*” my.package.MainClass
Under Linux:
java -cp “Test.jar:lib/*” my.package.MainClass
