001/* 002 * Copyright 2002-2017 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.web.context.support; 018 019import java.io.IOException; 020import javax.servlet.ServletException; 021import javax.servlet.http.HttpServlet; 022import javax.servlet.http.HttpServletRequest; 023import javax.servlet.http.HttpServletResponse; 024 025import org.springframework.context.support.LiveBeansView; 026 027/** 028 * Servlet variant of {@link LiveBeansView}'s MBean exposure. 029 * 030 * <p>Generates a JSON snapshot for current beans and their dependencies in 031 * all ApplicationContexts that live within the current web application. 032 * 033 * @author Juergen Hoeller 034 * @since 3.2 035 * @see org.springframework.context.support.LiveBeansView#getSnapshotAsJson() 036 */ 037@SuppressWarnings("serial") 038public class LiveBeansViewServlet extends HttpServlet { 039 040 private LiveBeansView liveBeansView; 041 042 043 @Override 044 public void init() throws ServletException { 045 this.liveBeansView = buildLiveBeansView(); 046 } 047 048 protected LiveBeansView buildLiveBeansView() { 049 return new ServletContextLiveBeansView(getServletContext()); 050 } 051 052 @Override 053 protected void doGet(HttpServletRequest request, HttpServletResponse response) 054 throws ServletException, IOException { 055 056 String content = this.liveBeansView.getSnapshotAsJson(); 057 response.setContentType("application/json"); 058 response.setContentLength(content.length()); 059 response.getWriter().write(content); 060 } 061 062}