Java tutorial
/* * Data Hub Service (DHuS) - For Space data distribution. * Copyright (C) 2013,2014,2015 GAEL Systems * * This file is part of DHuS software sources. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package fr.gael.dhus.api; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.StringWriter; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import java.security.Principal; import java.util.List; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletResponse; import org.apache.commons.io.IOUtils; import org.apache.log4j.Logger; import org.json.JSONException; import org.json.JSONObject; import org.json.XML; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.security.access.prepost.PreAuthorize; import org.springframework.security.authentication.UsernamePasswordAuthenticationToken; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import fr.gael.dhus.database.dao.ActionRecordWritterDao; import fr.gael.dhus.database.object.User; import fr.gael.dhus.database.object.config.server.ServerConfiguration; import fr.gael.dhus.search.SolrDao; import fr.gael.dhus.service.SearchService; import fr.gael.dhus.system.config.ConfigurationManager; @Controller public class SearchController { private static final Logger LOGGER = Logger.getLogger(SearchController.class); @Autowired private ActionRecordWritterDao actionRecordWritterDao; @Autowired private ConfigurationManager configurationManager; @Autowired private SearchService searchService; @Autowired private SolrDao solrDao; @PreAuthorize("hasRole('ROLE_SEARCH')") @RequestMapping(value = "/search/suggest/{query}") public void suggestions(@PathVariable String query, HttpServletResponse res) throws IOException { List<String> suggestions = searchService.getSuggestions(query); res.setStatus(HttpServletResponse.SC_OK); res.setContentType("text/plain"); try (ServletOutputStream outputStream = res.getOutputStream()) { if (suggestions != null) { for (String suggestion : suggestions) { outputStream.println(suggestion); } } } } @PreAuthorize("hasRole('ROLE_SEARCH')") @RequestMapping(value = "/search") public void search(Principal principal, @RequestParam(value = "q") String orginal_query, @RequestParam(value = "rows", defaultValue = "") String rows_str, @RequestParam(value = "start", defaultValue = "") String start_str, @RequestParam(value = "format", defaultValue = "") String format, HttpServletResponse res) throws IOException, JSONException { User user = (User) ((UsernamePasswordAuthenticationToken) principal).getPrincipal(); ServerConfiguration dhusServer = configurationManager.getServerConfiguration(); String query = convertQuery(orginal_query); LOGGER.info("Rewritted Query: " + query); String urlStr = "&dhusLongName=" + configurationManager.getNameConfiguration().getLongName() + "&dhusServer=" + dhusServer.getExternalUrl(); urlStr += "&originalQuery=" + orginal_query; urlStr = urlStr.replace(" ", "%20"); int skip = 0; int rows = 10; if (rows_str != null && !rows_str.isEmpty()) { try { rows = Integer.parseInt(rows_str); urlStr += "&rows=" + rows_str; } catch (NumberFormatException nfe) { /* noting to do : keep the default value */ } } if (start_str != null && !start_str.isEmpty()) { try { skip = Integer.parseInt(start_str); urlStr += "&start=" + start_str; } catch (NumberFormatException nfe) { /* noting to do : keep the default value */ } } URLEncoder.encode(urlStr, "UTF-8"); actionRecordWritterDao.search(orginal_query, skip, rows, user); // solr is only accessible from local server String local_url = dhusServer.getUrl(); URL obj = new URL(local_url + "/solr/dhus/select?" + query + "&wt=xslt&tr=opensearch_atom.xsl" + urlStr); HttpURLConnection con = (HttpURLConnection) obj.openConnection(); con.setRequestMethod("GET"); try (InputStream is = con.getInputStream()) { try (ServletOutputStream os = res.getOutputStream()) { res.setStatus(HttpServletResponse.SC_OK); if ("json".equalsIgnoreCase(format)) { res.setContentType("application/json"); toJSON(is, os); } else { res.setContentType(con.getContentType()); IOUtils.copy(is, os); } } } } private String convertQuery(String query) { String ret = solrDao.updateQuery(query); ret = ret.replaceAll(" ", "%20"); return "q=" + ret; } /** * Converts input xml stream into output json stream. * WARNING this implementation stores xml data into memory. * <p> * @param xml_stream * @param output * @throws IOException * @throws JSONException */ void toJSON(InputStream xml_stream, OutputStream output) throws IOException, JSONException { StringWriter writer = new StringWriter(); IOUtils.copy(xml_stream, writer, "UTF-8"); JSONObject xmlJSONObj = XML.toJSONObject(writer.toString().trim()); String jsonPrettyPrintString = xmlJSONObj.toString(3); output.write(jsonPrettyPrintString.getBytes()); } }