高德地图调用geoserver提供WMTS服务报错Unknown TILEMATRIX问题

1. 高德地图JSAPI要求WMTS必须是EPSG:3857坐标系
2. 高德调用WMTS服务时参数 TileMatrix中未带有坐标系字段，需要修改geoserver源码兼容一下，修改JSAPI也可以，如你用都用离线的话

leaflet加载geoserver的WMTS服务时TILEMATRIX字段

TILEMATRIX: EPSG:3857:13

在这里插入图片描述
高德是这样：
在这里插入图片描述

geoserver中源码是这样子取的，代码在geowebcache中，geoserver也是引用的org.geowebcache.service.wmts.WMTSService.java

		// 代码在geowebcache中 org.geowebcache.service.wmts.WMTSService.javafinal String tileMatrix = values.get("tilematrix");if (tileMatrix == null) {throw new OWSException(400, "MissingParameterValue", "TILEMATRIX", "No TILEMATRIX specified");}long z = gridSubset.getGridIndex(tileMatrix);// 这里z就是缩放级别，代码在坐标系的级别再又查找一次if (z < 0) {throw new OWSException(400, "InvalidParameterValue", "TILEMATRIX", "Unknown TILEMATRIX " + tileMatrix);}

修改如下：

        final String tileMatrix = values.get("tilematrix");if (tileMatrix == null) {throw new OWSException(400, "MissingParameterValue", "TILEMATRIX", "No TILEMATRIX specified");}long z = -1;if (tileMatrix.contains(tilematrixset)) {z = gridSubset.getGridIndex(tileMatrix);} else {z = Long.valueOf(tileMatrix);}if (z < 0) {throw new OWSException(400, "InvalidParameterValue", "TILEMATRIX", "Unknown TILEMATRIX " + tileMatrix);}

因为不想再打包geowebcache，所有直接在geoserver中添加这个类，编译时会覆盖jar包相同的类，就可以解决问题了。
在gs-gwc中直接增这个类并按上面修改。
在这里插入图片描述
重新编译geoserver就可以被高德JSAPI正常访问。

GeoWebCache：在这里
https://github.com/GeoWebCache/geowebcache/blob/main/geowebcache/wmts/src/main/java/org/geowebcache/service/wmts/WMTSService.java

修改后完整文件如下：

/*** This program is free software: you can redistribute it and/or modify it under the terms of the* GNU Lesser General Public License as published by the Free Software Foundation, either version 3* of the License, or (at your option) any later version.** <p>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 General Public License for more details.** <p>You should have received a copy of the GNU Lesser General Public License along with this* program. If not, see <http://www.gnu.org/licenses/>.** @author Arne Kepp, OpenGeo, Copyright 2009*/
package org.geowebcache.service.wmts;import com.google.common.base.Strings;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.geowebcache.GeoWebCacheDispatcher;
import org.geowebcache.GeoWebCacheException;
import org.geowebcache.GeoWebCacheExtensions;
import org.geowebcache.config.ServerConfiguration;
import org.geowebcache.conveyor.Conveyor;
import org.geowebcache.conveyor.ConveyorTile;
import org.geowebcache.filter.parameters.ParameterException;
import org.geowebcache.filter.security.SecurityDispatcher;
import org.geowebcache.grid.GridSetBroker;
import org.geowebcache.grid.GridSubset;
import org.geowebcache.grid.OutsideCoverageException;
import org.geowebcache.layer.TileJSONProvider;
import org.geowebcache.layer.TileLayer;
import org.geowebcache.layer.TileLayerDispatcher;
import org.geowebcache.mime.MimeException;
import org.geowebcache.mime.MimeType;
import org.geowebcache.service.HttpErrorCodeException;
import org.geowebcache.service.OWSException;
import org.geowebcache.service.Service;
import org.geowebcache.stats.RuntimeStats;
import org.geowebcache.storage.StorageBroker;
import org.geowebcache.util.NullURLMangler;
import org.geowebcache.util.ServletUtils;
import org.geowebcache.util.URLMangler;public class WMTSService extends Service {public static final String SERVICE_WMTS = "wmts";public static final String SERVICE_PATH ="/" + GeoWebCacheDispatcher.TYPE_SERVICE + "/" + SERVICE_WMTS;public static final String REST_PATH = SERVICE_PATH + "/rest";public static final String GET_CAPABILITIES = "getcapabilities";public static final String GET_FEATUREINFO = "getfeatureinfo";public static final String GET_TILE = "gettile";public static final String GET_TILEJSON = "gettilejson";private static final String STYLE_HINT = ";style=";enum RequestType {TILE,CAPABILITIES,FEATUREINFO,TILEJSON}static final String buildRestPattern(int numPathElements, boolean hasStyle) {if (!hasStyle) {return ".*/service/wmts/rest" + Strings.repeat("/([^/]+)", numPathElements);} else {return ".*/service/wmts/rest/([^/]+)/([^/]*)"+ Strings.repeat("/([^/]+)", numPathElements - 2);}}enum RestRequest {// "/{layer}/{tileMatrixSet}/{tileMatrix}/{tileRow}/{tileCol}"TILE(buildRestPattern(5, false), RequestType.TILE, false),// "/{layer}/{style}/{tileMatrixSet}/{tileMatrix}/{tileRow}/{tileCol}",TILE_STYLE(buildRestPattern(6, true), RequestType.TILE, true),// "/{layer}/{tileMatrixSet}/{tileMatrix}/{tileRow}/{tileCol}/{j}/{i}"FEATUREINFO(buildRestPattern(7, false), RequestType.FEATUREINFO, false),// "/{layer}/{style}/{tileMatrixSet}/{tileMatrix}/{tileRow}/{tileCol}/{j}/{i}",FEATUREINFO_STYLE(buildRestPattern(8, true), RequestType.FEATUREINFO, true),// "/{layer}/tilejson/{tileformat}"TILEJSON(buildRestPattern(3, false), RequestType.TILEJSON, false),// "/{layer}/{style}/tilejson/{tileformat}"TILEJSON_STYLE(buildRestPattern(4, true), RequestType.TILEJSON, true);Pattern pattern;RequestType type;boolean hasStyle;RestRequest(String pattern, RequestType type, boolean hasStyle) {this.pattern = Pattern.compile(pattern);this.type = type;this.hasStyle = hasStyle;}/** Returns the parsed KVP, or null if the path does not match the request pattern */public Map<String, String> toKVP(HttpServletRequest request) {final Matcher matcher = pattern.matcher(request.getPathInfo());if (!matcher.matches()) {return null;}Map<String, String> values = new HashMap<>();// go through the pattern and extract the actual request// leverage the predictable path structure to use a single parsing sequence for all// requestsint i = 1;String req = null;switch (type) {case FEATUREINFO:req = GET_FEATUREINFO;break;case TILEJSON:req = GET_TILEJSON;break;default:req = GET_TILE;break;}final boolean isFeatureInfo = type == RequestType.FEATUREINFO;values.put("request", req);values.put("layer", matcher.group(i++));if (hasStyle) {values.put("style", matcher.group(i++));}if (type != RequestType.TILEJSON) {values.put("tilematrixset", matcher.group(i++));values.put("tilematrix", matcher.group(i++));values.put("tilerow", matcher.group(i++));values.put("tilecol", matcher.group(i++));if (isFeatureInfo) {values.put("j", matcher.group(i++));values.put("i", matcher.group(i++));}} else {values.put("tileformat", matcher.group(++i));}if (request.getParameter("format") instanceof String) {if (isFeatureInfo) {values.put("infoformat", request.getParameter("format"));} else {values.put("format", request.getParameter("format"));}}return values;}}// private static Logger log =// Logging.getLogger(org.geowebcache.service.wmts.WMTSService.class);private StorageBroker sb;private TileLayerDispatcher tld;private GridSetBroker gsb;private RuntimeStats stats;private URLMangler urlMangler = new NullURLMangler();private GeoWebCacheDispatcher controller = null;private ServerConfiguration mainConfiguration;// list of this service extensions ordered by their priorityprivate final List<WMTSExtension> extensions = new ArrayList<>();private SecurityDispatcher securityDispatcher;/** Protected no-argument constructor to allow run-time instrumentation */protected WMTSService() {super(SERVICE_WMTS);extensions.addAll(GeoWebCacheExtensions.extensions(WMTSExtension.class));}public WMTSService(StorageBroker sb, TileLayerDispatcher tld, GridSetBroker gsb, RuntimeStats stats) {super(SERVICE_WMTS);this.sb = sb;this.tld = tld;this.gsb = gsb;this.stats = stats;extensions.addAll(GeoWebCacheExtensions.extensions(WMTSExtension.class));}public WMTSService(StorageBroker sb,TileLayerDispatcher tld,GridSetBroker gsb,RuntimeStats stats,URLMangler urlMangler,GeoWebCacheDispatcher controller) {super(SERVICE_WMTS);this.sb = sb;this.tld = tld;this.gsb = gsb;this.stats = stats;this.urlMangler = urlMangler;this.controller = controller;extensions.addAll(GeoWebCacheExtensions.extensions(WMTSExtension.class));}@Overridepublic Conveyor getConveyor(HttpServletRequest request, HttpServletResponse response)throws GeoWebCacheException, OWSException {// let's see if we have any extension that wants to provide a conveyor for this requestfor (WMTSExtension extension : extensions) {Conveyor conveyor = extension.getConveyor(request, response, sb);if (conveyor != null) {// this extension provides a conveyor for this request, we are donereturn conveyor;}}if (request.getPathInfo() != null && request.getPathInfo().contains("service/wmts/rest")) {return getRestConveyor(request, response);}String[] keys = {"layer","request","style","format","infoformat","tilematrixset","tilematrix","tilerow","tilecol","tileformat","i","j"};String encoding = request.getCharacterEncoding();Map<String, String> values =ServletUtils.selectedStringsFromMap(request.getParameterMap(), encoding, keys);return getKvpConveyor(request, response, values);}public Conveyor getRestConveyor(HttpServletRequest request, HttpServletResponse response)throws GeoWebCacheException, OWSException {final String path = request.getPathInfo();// special simpler case for GetCapabilitiesif (path.endsWith("/service/wmts/rest/WMTSCapabilities.xml")) {ConveyorTile tile = new ConveyorTile(sb, null, request, response);tile.setHint(GET_CAPABILITIES);tile.setRequestHandler(ConveyorTile.RequestHandler.SERVICE);return tile;}// all other paths are handled via the RestRequest enumeration, matching patterns and// extracting variablesfor (RestRequest restRequest : RestRequest.values()) {Map<String, String> values = restRequest.toKVP(request);if (values != null) {return getKvpConveyor(request, response, values);}}// we implement all WMTS supported request, this means that the provided request name is// invalidthrow new HttpErrorCodeException(404, "Unknown resource " + request.getPathInfo());}public Conveyor getKvpConveyor(HttpServletRequest request, HttpServletResponse response, Map<String, String> values)throws GeoWebCacheException, OWSException {// let's see if we have any extension that wants to provide a conveyor for this requestfor (WMTSExtension extension : extensions) {Conveyor conveyor = extension.getConveyor(request, response, sb);if (conveyor != null) {// this extension provides a conveyor for this request, we are donereturn conveyor;}}// check if we need to be CITE strictly compliantboolean isCitecompliant = isCiteCompliant();if (isCitecompliant) {performCiteValidation(request);}String req = values.get("request");if (req == null) {// OWSException(httpCode, exceptionCode, locator, exceptionText);throw new OWSException(400, "MissingParameterValue", "request", "Missing Request parameter");} else {req = req.toLowerCase();}if (isCitecompliant) {String acceptedVersions = getParameterValue("AcceptVersions", request);// if provided handle accepted versions parameterif (acceptedVersions != null) {// we only support version 1.0.0, so make sure that's one of the accepted versionsString[] versions = acceptedVersions.split("\\s*,\\s*");int foundIndex = Arrays.binarySearch(versions, "1.0.0");if (foundIndex < 0) {// no supported version is acceptedthrow new OWSException(400,"VersionNegotiationFailed",null,"List of versions in AcceptVersions parameter value, in GetCapabilities "+ "operation request, did not include any version supported by this server.");}}}if (req.equals(GET_TILE)) {if (isCitecompliant) {boolean isRestRequest = isRestRequest(request);// we need to make sure that a style was provided, otherwise GWC will just assume// the default oneif (!isRestRequest && getParameterValue("Style", request) == null) {// mandatory STYLE query parameter is missingthrow new OWSException(400,"MissingParameterValue","Style","Mandatory Style query parameter not provided.");}}ConveyorTile tile = getTile(values, request, response, RequestType.TILE);return tile;} else if (req.equals(GET_CAPABILITIES)) {ConveyorTile tile = new ConveyorTile(sb, values.get("layer"), request, response);tile.setHint(req);tile.setRequestHandler(ConveyorTile.RequestHandler.SERVICE);return tile;} else if (req.equals(GET_FEATUREINFO)) {ConveyorTile tile = getTile(values, request, response, RequestType.FEATUREINFO);tile.setHint(req);tile.setRequestHandler(Conveyor.RequestHandler.SERVICE);return tile;} else if (req.equals(GET_TILEJSON)) {ConveyorTile tile = new ConveyorTile(sb, values.get("layer"), request, response);String format = values.get("tileformat");tile.setMimeType(MimeType.createFromExtension(format));String hint = req;// I Will need the style when setting up the TileJSON tiles urlString style = values.get("style");if (style != null) {hint += (STYLE_HINT + style);}tile.setHint(hint);tile.setRequestHandler(ConveyorTile.RequestHandler.SERVICE);return tile;} else {// we implement all WMTS supported request, this means that the provided request name is// invalidthrow new OWSException(400,"InvalidParameterValue","request",String.format("Invalid request name '%s'.", req));}}private ConveyorTile getTile(Map<String, String> values,HttpServletRequest request,HttpServletResponse response,RequestType reqType)throws OWSException {String encoding = request.getCharacterEncoding();String layer = values.get("layer");if (layer == null) {throw new OWSException(400, "MissingParameterValue", "LAYER", "Missing LAYER parameter");}TileLayer tileLayer = null;try {tileLayer = tld.getTileLayer(layer);} catch (GeoWebCacheException e) {throw new OWSException(400, "InvalidParameterValue", "LAYER", "LAYER " + layer + " is not known.");}Map<String, String[]> rawParameters = new HashMap<>(request.getParameterMap());Map<String, String> filteringParameters;try {/** Merge values with request parameter*/for (Entry<String, String> e : values.entrySet()) {rawParameters.put(e.getKey(), new String[] {e.getValue()});}// WMTS uses the "STYLE" instead of "STYLES"for (Entry<String, String[]> e : rawParameters.entrySet()) {if (e.getKey().equalsIgnoreCase("STYLE")) {rawParameters.put("STYLES", e.getValue());break;}}filteringParameters = tileLayer.getModifiableParameters(rawParameters, encoding);} catch (ParameterException e) {throw new OWSException(e.getHttpCode(), e.getExceptionCode(), e.getLocator(), e.getMessage());} catch (GeoWebCacheException e) {throw new OWSException(500,"NoApplicableCode","",e.getMessage() + " while fetching modifiable parameters for LAYER " + layer);}MimeType mimeType = null;if (reqType == RequestType.TILE) {String format = values.get("format");if (format == null) {throw new OWSException(400,"MissingParameterValue","FORMAT","Unable to determine requested FORMAT, " + format);}try {mimeType = MimeType.createFromFormat(format);} catch (MimeException me) {throw new OWSException(400,"InvalidParameterValue","FORMAT","Unable to determine requested FORMAT, " + format);}} else {String infoFormat = values.get("infoformat");if (infoFormat == null) {throw new OWSException(400,"MissingParameterValue","INFOFORMAT","Parameter INFOFORMAT was not provided");}try {mimeType = MimeType.createFromFormat(infoFormat);} catch (MimeException me) {throw new OWSException(400,"InvalidParameterValue","INFOFORMAT","Unable to determine requested INFOFORMAT, " + infoFormat);}}final String tilematrixset = values.get("tilematrixset");if (tilematrixset == null) {throw new OWSException(400, "MissingParameterValue", "TILEMATRIXSET", "No TILEMATRIXSET specified");}GridSubset gridSubset = tileLayer.getGridSubset(tilematrixset);if (gridSubset == null) {throw new OWSException(400,"InvalidParameterValue","TILEMATRIXSET","Unable to match requested TILEMATRIXSET "+ tilematrixset+ " to those supported by layer");}final String tileMatrix = values.get("tilematrix");if (tileMatrix == null) {throw new OWSException(400, "MissingParameterValue", "TILEMATRIX", "No TILEMATRIX specified");}long z = -1;if (tileMatrix.contains(tilematrixset)) {z = gridSubset.getGridIndex(tileMatrix);} else {z = Long.valueOf(tileMatrix);}if (z < 0) {throw new OWSException(400, "InvalidParameterValue", "TILEMATRIX", "Unknown TILEMATRIX " + tileMatrix);}// WMTS has 0 in the top left corner -> flip y valuefinal String tileRow = values.get("tilerow");if (tileRow == null) {throw new OWSException(400, "MissingParameterValue", "TILEROW", "No TILEROW specified");}final long tilesHigh = gridSubset.getNumTilesHigh((int) z);long y = tilesHigh - Long.parseLong(tileRow) - 1;String tileCol = values.get("tilecol");if (tileCol == null) {throw new OWSException(400, "MissingParameterValue", "TILECOL", "No TILECOL specified");}long x = Long.parseLong(tileCol);long[] gridCov = gridSubset.getCoverage((int) z);if (x < gridCov[0] || x > gridCov[2]) {throw new OWSException(400,"TileOutOfRange","TILECOLUMN","Column " + x + " is out of range, min: " + gridCov[0] + " max:" + gridCov[2]);}if (y < gridCov[1] || y > gridCov[3]) {long minRow = tilesHigh - gridCov[3] - 1;long maxRow = tilesHigh - gridCov[1] - 1;throw new OWSException(400,"TileOutOfRange","TILEROW","Row " + tileRow + " is out of range, min: " + minRow + " max:" + maxRow);}long[] tileIndex = {x, y, z};try {gridSubset.checkCoverage(tileIndex);} catch (OutsideCoverageException e) {}ConveyorTile convTile =new ConveyorTile(sb,layer,gridSubset.getName(),tileIndex,mimeType,rawParameters,filteringParameters,request,response);convTile.setTileLayer(tileLayer);return convTile;}@Overridepublic void handleRequest(Conveyor conv) throws OWSException, GeoWebCacheException {// let's see if any extension wants to handle this requestfor (WMTSExtension extension : extensions) {if (extension.handleRequest(conv)) {// the request was handled by this extensionreturn;}}// no extension wants to handle this request, so let's proceed with a normal executionConveyorTile tile = (ConveyorTile) conv;String servletPrefix = null;if (controller != null) servletPrefix = controller.getServletPrefix();String servletBase = ServletUtils.getServletBaseURL(conv.servletReq, servletPrefix);String context =ServletUtils.getServletContextPath(conv.servletReq, new String[] {SERVICE_PATH, REST_PATH}, servletPrefix);if (tile.getHint() != null) {if (tile.getHint().equals(GET_CAPABILITIES)) {WMTSGetCapabilities wmsGC =new WMTSGetCapabilities(tld,gsb,tile.servletReq,servletBase,context,urlMangler,extensions);wmsGC.writeResponse(tile.servletResp, stats);} else if (tile.getHint().equals(GET_FEATUREINFO)) {getSecurityDispatcher().checkSecurity(tile);ConveyorTile convTile = (ConveyorTile) conv;WMTSGetFeatureInfo wmsGFI = new WMTSGetFeatureInfo(convTile);wmsGFI.writeResponse(stats);} else if (tile.getHint().startsWith(GET_TILEJSON)) {getSecurityDispatcher().checkSecurity(tile);ConveyorTile convTile = (ConveyorTile) conv;TileLayer layer = convTile.getLayer();String hint = tile.getHint();String style = null;int styleIndex = hint.indexOf(STYLE_HINT);if (styleIndex != -1) {style = hint.substring(styleIndex + STYLE_HINT.length());}if (layer instanceof TileJSONProvider) {// in GetCapabilities we are adding a TileJSON resource URL// only when the layer supports TileJSON.// That information allows us to return a 404 when// someone is asking a TileJSON when not supported.if (!((TileJSONProvider) layer).supportsTileJSON()) {throw new HttpErrorCodeException(404, "TileJSON Not supported");}WMTSTileJSON wmtsTileJSON =new WMTSTileJSON(convTile, servletBase, context, style, urlMangler);wmtsTileJSON.writeResponse(layer);}}}}void addExtension(WMTSExtension extension) {extensions.add(extension);}public Collection<WMTSExtension> getExtensions() {return Collections.unmodifiableCollection(extensions);}public void setSecurityDispatcher(SecurityDispatcher secDisp) {this.securityDispatcher = secDisp;}protected SecurityDispatcher getSecurityDispatcher() {return securityDispatcher;}/*** Sets GWC main configuration.** @param mainConfiguration GWC main configuration*/public void setMainConfiguration(ServerConfiguration mainConfiguration) {this.mainConfiguration = mainConfiguration;}/*** Return the GWC configuration used by this WMTS service instance.** @return GWC main configuration*/ServerConfiguration getMainConfiguration() {return mainConfiguration;}/*** Helper method that checks if WMTS implementation should be CITE strictly compliant.** @return TRUE if GWC main configuration or at least one of the WMTS extensions forces CITE*     compliance*/private boolean isCiteCompliant() {// let's see if main GWC configuration forces WMTS implementation to be CITE compliantif (mainConfiguration != null && mainConfiguration.isWmtsCiteCompliant()) {return true;}// let's see if at least one of the extensions forces CITE compliant modefor (WMTSExtension extension : extensions) {if (extension.getServiceInformation() != null&& extension.getServiceInformation().isCiteCompliant()) {return true;}}// we are not in CITE compliant modereturn false;}/** Helper method that performs CITE tests mandatory validations. */private static void performCiteValidation(HttpServletRequest request) throws OWSException {// paths validation are not done for WMTS REST APIif (isRestRequest(request)) {return;}// base path should end with WMTSString basePath = request.getPathInfo();String[] paths = basePath.split("/");String lastPath = paths[paths.length - 1];if (!lastPath.equalsIgnoreCase("WMTS")) {// invalid base path, not found should be returnedthrow new OWSException(404, "NoApplicableCode", "request", "Service or request not found");}// service query parameter is mandatory and should be equal to WMTSvalidateWmtsServiceName("wmts", request);}/*** Helper method that just checks if current WMTS request is in the context of a REST API call,* certain OGC validations don't make sense in that context.*/private static boolean isRestRequest(HttpServletRequest request) {// rest/wmts is always lowercasereturn request.getPathInfo().contains("service/wmts/rest");}/*** Checks if the URL base path extracted service name matches the HTTP request SERVICE query* parameter value. If the HTTP request doesn't contains any SERVICE query parameter an OWS* exception will be returned.** <p>This validation only happens for WMTS service and if CITE strict compliance is activated.** @param pathServiceName service name extracted from the URL base path* @param request the original HTTP request* @throws OWSException if the URL path extracted service name and the HTTP request service name*     don't match*/private static void validateWmtsServiceName(String pathServiceName, HttpServletRequest request)throws OWSException {if (pathServiceName == null || !pathServiceName.equalsIgnoreCase("WMTS")) {// not an OGC service, so nothing to doreturn;}// let's see if the service path and requested service matchString requestedServiceName = getParameterValue("SERVICE", request);if (requestedServiceName == null) {// mandatory service query parameter not providedthrow new OWSException(400,"MissingParameterValue","service","Mandatory SERVICE query parameter not provided.");}if (!pathServiceName.equalsIgnoreCase(requestedServiceName)) {// bad request, the URL path service and the requested service don't matchthrow new OWSException(400,"InvalidParameterValue","service",String.format("URL path service '%s' don't match the requested service '%s'.",pathServiceName, requestedServiceName));}}/*** Search in a non case sensitive way for a query parameter in the provided HTTP request. If the* query parameter is found is first value is returned otherwise NULL is returned.** @param parameterName query parameter name to search* @param request HTTP request* @return the first value of the query parameter if it exists otherwise NUL L*/private static String getParameterValue(String parameterName, HttpServletRequest request) {if (parameterName == null) {// nothing to doreturn null;}for (Map.Entry<String, String[]> entry : request.getParameterMap().entrySet()) {if (entry.getKey() != null && entry.getKey().equalsIgnoreCase(parameterName)) {// we found our parameterString[] values = entry.getValue();return values != null ? values[0] : null;}}// parameter not foundreturn null;}
}

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