web.xml中添加

<!--    配置SpringMVC乱码过滤-->
    <filter>
        <filter-name>encoding</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encoding</filter-name>
        <url-pattern>/</url-pattern>
    </filter-mapping>

JSON乱码问题

<mvc:annotation-driven>
  <mvc:message-converters register-defaults="true">
        <bean class="org.springframework.http.converter.StringHttpMessageConverter">
      <constructor-arg value="UTF-8"/>
    	</bean>
     <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
       <property name="objectMapper">
     <bean 
 class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
       <property name="failOnEmptyBeans" value="false"/>
          </bean>
       </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>