##使用Maven打包的时候出现的错误

[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.603 s
[INFO] Finished at: 2020-10-22T00:28:09+08:00
[INFO] Final Memory: 21M/309M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project customer: Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode) -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

网上也找寻了很多版本问题

1.如果WebContent/WEB-INF/web.xml文件存在，需要在pom.xml文件中加上maven-war-plugin插件

<build>
        <plugins>
        <!--加上此代码即可-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.0.0</version>
                <configuration>
                    <webResources>
                        <resource>
                            <directory>WebContent</directory>
                        </resource>
                    </webResources>
                </configuration>
            </plugin>
        </plugins>
</build>

2.如果web.xml文件不存在，则按下面的方式配置。

<build>
        <plugins>
        <!--加上此代码即可-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.0.0</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
</build>

成没成功可以看war里面的文件 是不是全的！！

附一张我这边没有web.xml的 成功图