1.检查了web.xml中已经增加了过滤中文编码

<!-- Character Encoding filter -->
    <filter>
        <filter-name>encodingFilter</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>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

2.检查容器tomcat，修改tomcat的conf/server.xml中的
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" useBodyEncodingForURI="true"  URIEncoding="UTF-8" />

在Connector标签加上useBodyEncodingForURI="true"  URIEncoding="UTF-8" 就可以了