tomcat解决GET请求中文参数乱码

通常，在使用Spring MVC框架的应用程序中，为了解决中文参数乱码的问题，都会添加如下过滤器配置：

<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>

但是，在Tomcat下运行时，对于GET请求参数的处理和POST参数不同，会出现POST中文参数正常，但是GET请求中文参数乱码的情形。
通过查看Tomcat相关源码得知，为了处理GET请求中的中文参数乱码问题，必须明确设置Connector的URIEncoding属性为指定编码。
具体配置如下：

<Connector port="8000" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" URIEncoding="utf-8"/>

org.apache.catalina.connector.CoyoteAdapter类service()方法源码片段如下：

@Override
public void service(org.apache.coyote.Request req, org.apache.coyote.Response res)
        throws Exception {

    Request request = (Request) req.getNote(ADAPTER_NOTES);
    Response response = (Response) res.getNote(ADAPTER_NOTES);

    if (request == null) {
        // Create objects
        request = connector.createRequest();
        request.setCoyoteRequest(req);
        response = connector.createResponse();
        response.setCoyoteResponse(res);

        // Link objects
        request.setResponse(response);
        response.setRequest(request);

        // Set as notes
        req.setNote(ADAPTER_NOTES, request);
        res.setNote(ADAPTER_NOTES, response);

        // Set query string encoding
        req.getParameters().setQueryStringEncoding(connector.getURIEncoding()); // 显然，在处理GET查询参数编码时是获取Connector的URIEncoding属性
    }
    ...
}