这是一个Valve实现的概念证明：
import java.io.IOException;
import java.security.Principal;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.catalina.realm.GenericPrincipal;
import org.apache.catalina.valves.ValveBase;
public class RemoteUserValve extends ValveBase {
public RemoteUserValve() {
}
@Override
public void invoke(final Request request, final Response response)
throws IOException, ServletException {
final String username = "myUser";
final String credentials = "credentials";
final List<String> roles = new ArrayList<String>();
// Tomcat 7 version
final Principal principal = new GenericPrincipal(username,
credentials, roles);
// Tomcat 6 version:
// final Principal principal = new GenericPrincipal(null,
// username, credentials, roles);
request.setUserPrincipal(principal);
getNext().invoke(request, response);
}
}
（已在Tomcat 7.0.21中测试。）
编译它，将其放入一个jar中，然后将jar复制到该apache-tomcat-7.0.21/lib文件夹中。您需要修改server.xml：
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true">
<Valve className="remoteuservalve.RemoteUserValve" />
...
我想它也可以在Engine和Context容器中使用。
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