net.hasor.web.objects.ForwardTo Maven / Gradle / Ivy
/*
* Copyright 2008-2009 the original author or authors.
*
* 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 net.hasor.web.objects;
import net.hasor.utils.StringUtils;
import net.hasor.web.Invoker;
import net.hasor.web.render.RenderEngine;
import net.hasor.web.render.RenderInvoker;
import net.hasor.web.render.RenderType;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.Writer;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* 处理结果，将其 toString 并执行 Forward 操作。
* @version : 2020-03-04
* @author 赵永春 ([email protected])
*/
@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@RenderType(engineType = ForwardTo.RedirectRenderEngine.class)
public @interface ForwardTo {
public class RedirectRenderEngine implements RenderEngine {
@Override
public void process(RenderInvoker invoker, Writer writer) throws Throwable {
Object o = invoker.get(Invoker.RETURN_DATA_KEY);
String redirectTo = null;
if (o != null) {
redirectTo = o.toString();
}
if (StringUtils.isBlank(redirectTo)) {
throw new NullPointerException("redirect to empty.");
}
HttpServletResponse httpResponse = invoker.getHttpResponse();
if (!httpResponse.isCommitted()) {
HttpServletRequest httpRequest = invoker.getHttpRequest();
httpRequest.getRequestDispatcher(redirectTo).forward(invoker.getHttpRequest(), invoker.getHttpResponse());
}
}
}
}