通过Maven导出war包时报错：Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project

通过Maven导出war包时报错：Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project Ocr: Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode) -> [Help 1] 

原因是找不到web.xml，在pom文件中添加如下配置可以解决：

    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.7</version>
<!--                 <configuration>
                    <configurationFile>${basedir}/src/main/resources/generatorConfig.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration> -->
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.42</version>
                    </dependency>
                </dependencies>

            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <webXml>WebContent\WEB-INF\web.xml</webXml>
                </configuration>
            </plugin>

        </plugins>
    </build>