为什么 Maven 会警告我有关编码的问题？

问题描述 投票：0回答：4

我的目标是从项目创建一个原型。

当我运行不涉及 maven-archetype-plugin 的目标时，我看不到任何警告：

[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ maven-archetype-base ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ maven-archetype-base ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO]

在另一端，当我运行 archetype:create-from-project 时，我得到了几个：

[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ maven-archetype-base-archetype ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 10 resources
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ maven-archetype-base-archetype ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 2 resources

我知道“标准”maven 方式是使用 

project.build.sourceEncoding
属性。我尝试向 pom 添加更多属性来解决这个问题，但没有一个起作用。

有什么想法吗？谢谢。

我有以下 pom.xml：

<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>
<groupId>my.group.id</groupId>
<artifactId>my-artifact</artifactId>
<version>0.0.1</version>
<packaging>maven-archetype</packaging>

<properties>

    <!-- Compiler properties -->
    <maven.compiler.target>1.7</maven.compiler.target>
    <maven.compiler.source>1.7</maven.compiler.source>
    <encoding>UTF-8</encoding>
    <project.build.sourceEncoding>${encoding}</project.build.sourceEncoding>
    <project.reporting.outputEncoding>${encoding}</project.reporting.outputEncoding>
    <project.resources.sourceEncoding>${encoding}</project.resources.sourceEncoding>
    <archetype.encoding>${encoding}</archetype.encoding>

    <!-- Maven plugins version -->
    <maven-archetype-plugin-version>2.2</maven-archetype-plugin-version>
    <maven-resources-plugin-version>2.6</maven-resources-plugin-version>

    <!-- Maven extentions version -->
    <maven-archetype-packaging-extension-version>2.2</maven-archetype-packaging-extension-version>
</properties>
<dependencies>
[...]
</dependencies>

<build>
    <extensions>
        <extension>
            <groupId>org.apache.maven.archetype</groupId>
            <artifactId>archetype-packaging</artifactId>
            <version>${maven-archetype-packaging-extension-version}</version>
        </extension>
    </extensions>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-resources-plugin</artifactId>
            <version>${maven-resources-plugin-version}</version>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-archetype-plugin</artifactId>
            <version>${maven-archetype-plugin-version}</version>
            <extensions>true</extensions>
        </plugin>

    </plugins>

    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
        </resource>
    </resources>
</build>

java maven maven-archetype
4个回答
249
投票

您还没有像这样设置 encoding default 属性：

<project>
  ...
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  ...
</project>

这种方法比为每个插件手动定义编码更好，因为所有插件都有默认的 编码值，例如 maven-resources-plugin:

encoding:

The character encoding scheme to be applied when filtering resources.
Type: java.lang.String
Required: No
User Property: encoding
Default: ${project.build.sourceEncoding}

所以这意味着你只需要定义这个属性，插件就会自动使用这个编码。

61
投票

我很恼火地看到maven在上面的条目之后继续抱怨

然后我意识到它是故障安全插件，它需要自己的属性

所以就这样了

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
33
投票

当您运行目标 

archetype:create-from-project
时，Maven 会生成一个 POM 文件，用于在 
target/generated-sources/archetype/pom.xml
处构建原型，然后在此 POM 上运行 
package
目标（默认情况下）。

生成的 POM 文件没有 

project.build.sourceEncoding
或任何其他定义编码的属性，这就是您收到警告的原因。

POM 是由 org.apache.maven.archetype.creator.FilesetArchetypeCreator#createArchetypeProjectPom

 从
这个原型 生成的，并且从该代码中似乎没有办法向生成的 POM 文件添加属性。

0
投票

参考下面的pom.xml并根据需要在pom文件中进行更正。这是完整的工作 pom xml

    <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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>employee</groupId>
    <artifactId>employee</artifactId>
    <version>0.0.4-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <dependency>
            <groupId>com.oracle.database.jdbc</groupId>
            <artifactId>ojdbc8</artifactId>
            <version>21.5.0.0</version>
        </dependency>
        <dependency>
            <groupId>javax.json</groupId>
            <artifactId>javax.json-api</artifactId>
            <version>1.1</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish</groupId>
            <artifactId>javax.json</artifactId>
            <version>1.1</version>
        </dependency>
        <!-- <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.1.1</version>
        </dependency> -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.7</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.0.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml  -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>8.0</version>

        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.mail</groupId>
            <artifactId>javax.mail</artifactId>
            <version>1.6.2</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.5</version>
        </dependency>
        <!-- 
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.7</version>
        </dependency>
        -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.17.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.17.1</version>
        </dependency>

    </dependencies>

    <scm>
        <developerConnection>
            scm:git:https://github.com/bipuljaishwal/EmployeManagement.git</developerConnection>
        <tag>employee-0.0.2</tag>
    </scm>

    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
        </resources>
        <plugins>

            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <release>17</release>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.2.3</version>
            </plugin>
            <!-- 
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-release-plugin</artifactId>
                <version>3.0.1</version>
            </plugin>
            -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>3.1.0</version>
            </plugin>
            <plugin>
                <artifactId>maven-deploy-plugin</artifactId>
                <version>3.1.1</version>
            </plugin>
        </plugins>
    </build>
    <distributionManagement>
       <repository>
         <id>internal.repo</id>
         <name>Internal repo</name>
         <url>file:///D:/Maven</url>
       </repository>
   </distributionManagement>
   <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
</project>
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