tomcat解决GET请求中文参数乱码

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 }
...
}。