redirectionhttphandlerbase.java

来自「ajax patterns 这是关于ajax设计模式方面的原代码」· Java 代码 · 共 52 行

/*
    Copyright 2006 Christian Gross http://www.devspace.com
    From the book Ajax Patterns and Best Practices

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
package devspace.ajax.permutations;
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
import devspace.testDrivenDevelopment.tracer.*;

public abstract class RedirectionHttpHandlerBase extends AuthenticatedHttpHandlerBase {
    protected abstract String getBaseURL();
    protected abstract String getURLEnding();
    
    public int getRedirectionStatusCode() {
        return 201;
    }
    protected void service( HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        GenerateOutput.Write("RedirectionHttpHandlerBase.ProcessRequest", "Processing redirection");
        identifyUser(request, response);
        if (!_identifiedUser.isIdentified()) {
            super.service( request, response);
            return;
        }
        String url = request.getRequestURI();
        if (url.compareTo(getBaseURL()) == 0) {
            String newURL = getBaseURL() + "/" + getURLEnding();
            GenerateOutput.Write("RedirectionHttpHandlerBase.ProcessRequest", "Doing a redirection (" + newURL + ")");
            response.addHeader("Location", newURL);
            response.setStatus( getRedirectionStatusCode(), "Redirecting to a user URL");
            return;
        }
        else {
            GenerateOutput.Write("RedirectionHttpHandlerBase.ProcessRequest", "Request is redirected");
            super.service( request, response);
        }
    }
}