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 setting👉profiles👉profile👉properties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>