java - 不用修改原代码，用Maven替换JAVA代码中的一个常量

Question

我在 java 常量中有一个文本，我想根据以下方式生成 Artifact 时配置的 maven 变量替换它:

public class FOO {
    public static final String BASE = "/@FOO@";
}

问题是如果我替换java代码，它会被永久替换并且不再执行替换，所以如果我改变变量的值它没有效果:

<plugin>
    <groupId>com.google.code.maven-replacer-plugin</groupId>
    <artifactId>replacer</artifactId>
    <version>1.5.3</version>
    <executions>
        <execution>
            <phase>generate-sources</phase>
            <goals>
                <goal>replace</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <includes>
            <include>${basedir}/src/main/java/com/my/package/Constants.java</include>
        </includes>
        <replacements>
            <replacement>
                <token>@FOO@</token>
                <value>${my.custom.property}</value>
            </replacement>
        </replacements>
    </configuration>
</plugin>

我通过反向执行这个过程来解决这个问题:

 <plugin>
    <groupId>com.google.code.maven-replacer-plugin</groupId>
    <artifactId>replacer</artifactId>
    <version>1.5.3</version>
    <executions>
        <execution>
            <id>first-execution</id>
            <phase>generate-sources</phase>
            <goals>
                <goal>replace</goal>
            </goals>
            <configuration>
                <includes>
                    <include>${basedir}/src/main/java/com/my/package/Constants.java</include>
                </includes>
                <replacements>
                    <replacement>
                        <token>@FOO@</token>
                        <value>${my.custom.property}</value>
                    </replacement>
                </replacements>
            </configuration>                        
        </execution>
        
        <execution>
            <id>second-execution</id>
            <phase>prepare-package</phase>
            <goals>
                <goal>replace</goal>
            </goals>
            <configuration>
                <includes>
                    <include>${basedir}/src/main/java/com/my/package/Constants.java</include>
                </includes>
                <replacements>
                    <replacement>
                        <token>${my.custom.property}</token>
                        <value>@FOO@</value>
                    </replacement>
                </replacements>
            </configuration>                        
        </execution>                    
    </executions>
</plugin>

但是这第二步可能很危险，因为可能会发生冲突并替换类的 java 代码中具有相同值的内容。
另一种选择是替换 .class 文件，如下所示:

<plugin>
    <groupId>com.google.code.maven-replacer-plugin</groupId>
    <artifactId>replacer</artifactId>
    <version>1.5.3</version>
    <executions>
        <execution>
            <phase>generate-sources</phase>
            <goals>
                <goal>replace</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <includes>
            <include>${basedir}/target/my-artifact-directory/WEB-INF/classes/com/my/package//Constants$PATHS.class</include>
        </includes>
        <replacements>
            <replacement>
                <token>@FOO@</token>
                <value>${my.custom.property}</value>
            </replacement>
        </replacements>
    </configuration>
</plugin>

替换有效，但应用程序无法正常启动。
关于如何在不修改原始代码的情况下执行替换的任何其他想法？

Answer 1

我会在 src/main/resources 中创建一个资源文件在 FOO 中读取并使用 Maven 资源插件的资源过滤类似于对 spring maven profile - set properties file based on compilation profile 的回答:foo.properties

BASE=${propertyName}

pom.xml

<project>
  ...
  <properties>
    <propertyName>property value</propertyName>
  </properties>

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