如何指定maven中java版本

使用maven-compiler-plugin插件

如下

<plugins>
    <plugin>    
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
            <source>11</source>   -- java版本
            <target>11</target>   -- java版本
        </configuration>
    </plugin>
</plugins>

或者

<properties>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
</properties>

两者是等价的

 如果你使用的是idea上面的设置还能同时修改代码module里的language level。

使用spring boot时

如果pom.xml继承了spring-boot-starter-parent

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>xxxx</version>
    <relativePath/>
</parent>

还可以使用如下方式来指定java版本

<properties>
    <java.version>11</java.version>  -- java版本
</properties>

底层其实也是定义了 maven.compiler.source 和 maven.compiler.target 两个属性

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath>../../spring-boot-dependencies</relativePath>
    </parent>
    <artifactId>spring-boot-starter-parent</artifactId>
    <packaging>pom</packaging>
    <name>Spring Boot Starter Parent</name>
    <description>Parent pom providing dependency and plugin management for applications
        built with Maven</description>
    <url>https://projects.spring.io/spring-boot/#/spring-boot-starter-parent</url>
    <properties>
        <java.version>1.8</java.version>
        <maven.compiler.source>${java.version}</maven.compiler.source>
        <maven.compiler.target>${java.version}</maven.compiler.target>
    </properties>
</project>

 参考

https://stackoverflow.com/questions/38882080/specifying-java-version-in-maven-differences-between-properties-and-compiler-p

https://stackoverflow.com/questions/54467287/how-to-specify-java-version-in-spring-spring-boot-pom-xml