/*
 * 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
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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 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
See Also:
Since:3.2
/** * Servlet variant of {@link LiveBeansView}'s MBean exposure. * * <p>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); } }