Html Chinese returned by springMvc becomes a question mark? ?

This is because you integrated Velocity, you need to configure the following files in spring

<bean id="velocityViewResolver"

class="org.springframework.web.servlet.view.velocity.VelocityViewResolver">

<property name="suffix" value=".html" />

<property name="contentType">

<value>text/html;charset=UTF-8</value>

</property>

</bean>