org.springframework.web.context.support.LiveBeansViewServlet Maven / Gradle / Ivy
/*
* Copyright 2002-2017 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 org.springframework.web.context.support;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.context.support.LiveBeansView;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Servlet variant of {@link LiveBeansView}'s MBean exposure.
*
* Generates a JSON snapshot for current beans and their dependencies in
* all ApplicationContexts that live within the current web application.
*
* @author Juergen Hoeller
* @since 3.2
* @see org.springframework.context.support.LiveBeansView#getSnapshotAsJson()
*/
@SuppressWarnings("serial")
public class LiveBeansViewServlet extends HttpServlet {
@Nullable
private LiveBeansView liveBeansView;
@Override
public void init() throws ServletException {
this.liveBeansView = buildLiveBeansView();
}
protected LiveBeansView buildLiveBeansView() {
return new ServletContextLiveBeansView(getServletContext());
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Assert.state(this.liveBeansView != null, "No LiveBeansView available");
String content = this.liveBeansView.getSnapshotAsJson();
response.setContentType("application/json");
response.setContentLength(content.length());
response.getWriter().write(content);
}
}