Maven中指定Java的編譯版本和源文件編碼方式

使用Maven編譯Java項目，默認的編譯版本是1.5.

參考官網的說明－》https://maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html

source	String	2.0	The -source argument for the Java compiler. Default value is: 1.5. User property is: maven.compiler.source.
target	String	2.1	The -encoding argument for the Java compiler. Default value is: ${project.build.sourceEncoding}. User property is: encoding.
encoding	String	2.0	The -target argument for the Java compiler. Default value is: 1.5. User property is: maven.compiler.target.

若是要指定Java編譯版本有兩種方式

1）在settings.xml中指定，例如

<profiles>      
    <profile>  
        <id>JDK1.7</id>  
        <activation>  
            <activeByDefault>true</activeByDefault>  
        </activation>  
        <properties>  
            <maven.compiler.source>1.7</maven.compiler.source>  
            <maven.compiler.target>1.7</maven.compiler.target>  
            <encoding>UTF-8</encoding>  
        </properties>  
    </profile>  
</profiles> 

2）在pom.xml中指定，例如

<build>  
    <plugins>  
        <plugin>  
            <groupId>org.apache.maven.plugins</groupId>  
            <artifactId>maven-compiler-plugin</artifactId>  
            <version>${maven-compiler-plugin.version}</version>  
            <configuration>  
                <source>1.7</source>  
                <target>1.7</target>  
                <encoding>UTF-8</encoding>  
            </configuration>  
        </plugin>  
    </plugins>  
</build>