maven在settings.xm和pom.xml中指定jdk版本编译

maven的settings.xm和pom.xml都可以通过 maven.compiler.source , maven.compiler.target 这两个属性值来指定jdk版本

• maven.compiler.source

• maven.compiler.target

maven.compiler.source

maven.compiler.target

在pom.xml中的位置

<project>
  <properties>
    <maven.compiler.source>21maven.compiler.source>
    <maven.compiler.target>21maven.compiler.target>
  properties>
project>

在settings.xml中的位置

<settings>
    <profiles>
        <profile>
            <activation>
                <activeByDefault>trueactiveByDefault>
            activation>
            <properties>
                <maven.compiler.source>21maven.compiler.source>
                <maven.compiler.target>21maven.compiler.target>  
            properties>
        profile>
    profiles>
settings>

在spring项目中, 用java.version来统一设置

maven的settings.xm和pom.xml也可以通过设定 maven-compiler-plugin 这个插件来指定jdk版本

<plugin>
    <groupId>org.apache.maven.pluginsgroupId>
    <artifactId>maven-compiler-pluginartifactId>
    <version>3.9.6version>
    <configuration>
        <source>21source>
        <target>21target>
    configuration>
plugin>

在pom.xml中的位置

<project>
  ...
  <build>
    ...
    <plugins>
      <plugin>
        <groupId>org.apache.maven.pluginsgroupId>
        <artifactId>maven-compiler-pluginartifactId>
        <version>3.9.6version>
        <configuration>
          <source>21source>
          <target>21target>
        configuration>
      plugin>
    plugins>
    ...
  build>
  ...
project>

在settings.xml中的位置 , 好像用不了

<settings>
  ...
  <profiles>
    <profile>
      <id>profile-maven-compiler-pluginid>
      <activation>
        <activeByDefault>trueactiveByDefault>
      activation>
      <build>
        <plugins>
          <plugin>
            <groupId>org.apache.maven.pluginsgroupId>
            <artifactId>maven-compiler-pluginartifactId>
            <version>3.9.6version>
            <configuration>
              <source>17source>
              <target>17target>
            configuration>
          plugin>
        plugins>
      build>
    profile>
  profiles>
  ...
settings>

Maven 在 settings.xml 中指定jdk版本

settings.xml 中的属性写在 settingprofilesprofileproperties中,位于第5层

方法一, 直接写死, 例如指定jdk21

<settings>
    <profiles>
        <profile>
            <id>jdk-version-21id>
            
            <activation>
                <activeByDefault>trueactiveByDefault> 
            activation>
            
            <properties>
                <maven.compiler.source>21maven.compiler.source>
                <maven.compiler.target>21maven.compiler.target>  
            properties>
        profile>
    profiles>
    
    
    <activeProfiles>
        
        <activeProfile>jdk-version-21activeProfile>  
    activeProfiles>
settings>

去掉注释

    <profiles>
        <profile>
            <id>jdk-version-21id>
            <activation>
                <activeByDefault>trueactiveByDefault> 
            activation>
            <properties>
                <maven.compiler.source>21maven.compiler.source>
                <maven.compiler.target>21maven.compiler.target>  
            properties>
        profile>
    profiles>
    <activeProfiles>
        <activeProfile>jdk-version-21activeProfile>  
    activeProfiles>

只用 true 激活, 可以不要 jdk-version-21和 jdk-version-21

    <profiles>
        <profile>
            <activation>
                <activeByDefault>trueactiveByDefault>
            activation>
            <properties>
                <maven.compiler.source>21maven.compiler.source>
                <maven.compiler.target>21maven.compiler.target>  
            properties>
        profile>
    profiles>

只用 jdk-version-21 激活 , 则可以不要

    <profiles>
        <profile>
            <id>jdk-version-21id>
            <properties>
                <maven.compiler.source>21maven.compiler.source>
                <maven.compiler.target>21maven.compiler.target>  
            properties>
        profile>
    profiles>
    <activeProfiles>
        <activeProfile>jdk-version-21activeProfile>
    activeProfiles>

引用属性变量,只在一个地方修设值jdk版本

<settings>
    <profiles>
        <profile>
            <id>set-jdk-versionid>
            
            <activation>
                <activeByDefault>trueactiveByDefault> 
            activation>
            
            <properties>
                <jdk-version>21jdk-version> 
                <maven.compiler.source>${jdk-version}maven.compiler.source>
                <maven.compiler.target>${jdk-version}maven.compiler.target>  
            properties>
        profile>
    profiles>
    
    
    <activeProfiles>
        
        <activeProfile>set-jdk-versionactiveProfile>  
    activeProfiles>
settings>

一处设置,双重激活

    <profiles>
        <profile>
            <id>set-JdkVersionid>
            <activation>
                <activeByDefault>trueactiveByDefault> 
            activation>
            <properties>
                <JdkVersion>21JdkVersion> 
                <maven.compiler.source>${JdkVersion}maven.compiler.source>
                <maven.compiler.target>${JdkVersion}maven.compiler.target>  
            properties>
        profile>
    profiles>
    <activeProfiles>
        <activeProfile>set-JdkVersionactiveProfile>  
    activeProfiles>

Maven 在 pom.xml 中指定jdk版本

在pom.xml中可以用设置属性或者设置插件两种方法来设置jdk版本

• 用设置属性的方式

<project>
  <properties>
    <maven.compiler.source>21maven.compiler.source>
    <maven.compiler.target>21maven.compiler.target>
  properties>
project>

    <maven.compiler.source>21maven.compiler.source>
    <maven.compiler.target>21maven.compiler.target>

• 用设置插件的方式 , 设置插件的方式优先级高于设置属性

<project>
  ...
  <build>
    ...
    <plugins>
      <plugin>
        <groupId>org.apache.maven.pluginsgroupId>
        <artifactId>maven-compiler-pluginartifactId>
         
        <configuration>
          <source>21source>
          <target>21target>
        configuration>
      plugin>
    plugins>
    ...
  build>
  ...
project>

• 用设置插件的方式 , 设置插件的方式优先级高于设置属性

    <plugins>
      <plugin>
        <groupId>org.apache.maven.pluginsgroupId>
        <artifactId>maven-compiler-pluginartifactId>
         
        <configuration>
          <source>21source>
          <target>21target>
        configuration>
      plugin>
    plugins>

两种方法都用上, , 插件的优先级高于属性

  <properties>
    <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
    <JdkVersionOfThisPom>17JdkVersionOfThisPom>
    <java.version>${JdkVersionOfThisPom}java.version>
    <maven.compiler.source>${JdkVersionOfThisPom}maven.compiler.source>
    <maven.compiler.target>${JdkVersionOfThisPom}maven.compiler.target>
    <maven.compiler.compilerVersion>${JdkVersionOfThisPom}maven.compiler.compilerVersion>
  properties>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.pluginsgroupId>
        <artifactId>maven-compiler-pluginartifactId>

        <configuration>
          <source>${JdkVersionOfThisPom}source>
          <target>${JdkVersionOfThisPom}target>
          <compilerVersion>${JdkVersionOfThisPom}compilerVersion>
        configuration>
      plugin>
    plugins>
  build>