如何在maven pom.xml文件中設置Java編譯器版本

今天遇到一個問題：

在Eclipse中用maven創建一個新的web項目，然后再用maven update一下，則JDK版本自動變為1.5。

 

通過查找資料，終於發現maven編譯器插件（Maven Compiler Plugin）的文檔中有如下解釋：

The Compiler Plugin is used to compile the sources of your project. Since 3.0, the default compiler is javax.tools.JavaCompiler (if you are using java 1.6) and is used to compile Java sources. If you want to force the plugin using javac, you must configure the plugin option forceJavacCompilerUse.

Also note that at present the default source setting is 1.5 and the default target setting is 1.5, independently of the JDK you run Maven with. If you want to change these defaults, you should set source and target as described in Setting the -source and -target of the Java Compiler.

有兩種方式可以設置編譯器版本。以下是pom.xml文件的代碼片段：

第一種方法：

<project>
    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
</project>

第二種方法：

<project>
    <build>
    <plugins>
        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
        </configuration>
        </plugin>
    </plugins>
    </build>
</project>

最后在eclipse里面右鍵點擊項目，使用maven重新更新項目即可。