pom修改：

       <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
            </plugin>
                        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>build-helper-maven-plugin</artifactId>
            <executions>
               <execution>
                    <id>add-source</id>
                    <phase>generate-sources</phase>
                    <goals>
                    <goal>add-source</goal>
                    </goals>
                    <configuration>
                    <sources>
                    <source>src/main/java</source>
                    <source>src/main/java_spdb</source>
                    </sources>
                    </configuration>
                </execution>
            </executions>
            </plugin>