MapXtremeforJava開(kāi)發(fā) 專(zhuān)題一：怎樣在應(yīng)用中創(chuàng)建地 專(zhuān)題二：怎樣操作地圖---控制地圖顯 專(zhuān)題三：怎樣進(jìn)行空間特征值的搜 專(zhuān)題四：怎樣對(duì)空間特征值對(duì)象編 專(zhuān)題五：怎樣進(jìn)行專(zhuān)題分 專(zhuān)題七：怎樣實(shí)現(xiàn)GPS專(zhuān)題八：怎樣調(diào)用空間數(shù)據(jù)庫(kù)中的地 專(zhuān)題九：怎樣快速響應(yīng)多并發(fā)用戶數(shù)據(jù)庫(kù)數(shù)據(jù)請(qǐng) 專(zhuān)題十：怎樣將影像圖與矢量圖進(jìn)行疊 MapXtremeforJava開(kāi)發(fā)三種WebGIS模式。MXTJMapXtremeServlet、MapJ、Renderers、DataProvidersMapXtremeServlet1提供柵格地圖數(shù)據(jù)服務(wù)，2提供矢量地圖數(shù)據(jù)服務(wù)，3提供圖元文件數(shù)據(jù)服務(wù)（例:tab）；MapJMapxtremeAPI：1（例：地et響應(yīng)的數(shù)據(jù)和；Renderer用來(lái)生成返回客戶端地圖數(shù)據(jù)的組件，有四種：LocalRenderer、MapXtremeImageRenderer、.Intra-ServletContainer positeRenderer。使用MapXtremeImageRender可以在產(chǎn)生地圖圖像，包含MapJ的應(yīng)用程序和一個(gè)MapXtremeServlet實(shí)例通訊，產(chǎn)生地圖圖像；LocalRender將地圖輸出為Java2DGraphics2D對(duì)象，所有的Render在客戶端產(chǎn)生，也即所謂地圖的矢量傳輸方式；使用IntraServletContainerRenderer不需socketconnection，從而MapXtremeSevlet將地圖直接傳回給客戶端；CompositeRenderer將地圖分為動(dòng)態(tài)與靜態(tài)圖層，當(dāng)需要更新地圖時(shí)，可只更新動(dòng)態(tài)圖層，DataProviderLayer（圖層）對(duì)象的內(nèi)部對(duì)象，它不是直接由用戶創(chuàng)建的，但是它的描述是對(duì)圖層的DataProvider：TableDescHelper–描述數(shù)據(jù)；DataProviderHelper–定義數(shù)據(jù)的源；ataProviderRef–描述獲取數(shù)據(jù)的方式。Map步驟： 創(chuàng)建MapJ 設(shè)圖尺 生成 myMap=new GeoSet（*.gst）MapDefinition（*.mdf）文件加載地圖數(shù)據(jù)。MapXtrememyMap.loadGeoset(geosetName,dataDir,geosetName：geoset（包括路徑dataDir：geoset中的tab地圖文件的位置 URLNULL 加載MapMapDefContainer，有兩種情況：MapDefContainermdc=newMapDefContainermdc=newMapDefContainermdc=newJDBCMapDefContainer(driver,url,use其中，driver,url,user,passwordOracleSpatialMapRefContainer，地圖定義保存在數(shù)據(jù)庫(kù)的表中：OraSoMapDefContainermdc=

newOraSoMapDefContainer("oracle.jdbc.driver.OracleDriver","jdbc:oracle:thin:@machinename:"username","password","tableName","Name",myMap.loadMapDefinition(mapDefContainer,name)name是地圖定義的名字，如：myMap.loadMapDefinition(mdc, myMap.setDeviceBounds(newDoubleRect(0,0,800, 生成生成需要一下幾步 StringmapxtremeServletUrl= 創(chuàng) poser poser.create(myMap,256,表示是256色背景為藍(lán)色的GIF圖 MapXtremeImageRendererrenderernew 生成toStream,toImage如果使用MapJ直接獲取地圖數(shù)據(jù)并生成，則使用LocalRender而不是MapXtremeImageRender。MapXtremeImageRenderLocalRender專(zhuān)題二：怎樣操作地圖---設(shè)圖視野zoom//Assumingthatthecurrentdistanceunitsarekilometers,thiscommandwillsetthe//mapzoomto500kilometers.設(shè)圖中設(shè)圖中心的方法是setCenter()//Pointscreenpoint=new//worldpoint=//設(shè)圖中設(shè)圖邊DoubleRectbounds=newDoubleRect(-180,-90,180,90);DoubleRectbounds=newDoubleRect(newDoublePoint(0,0),360,180);設(shè)圖投坐標(biāo)數(shù)據(jù)在server\mapinfow.prj文件中,包含上百種投影。PRJStringcsProj=newString("\"AzimuthalEquidistant(NorthPole)\",5,62,7,0,0,CoordSysts=CoordSys.createFromPRJ(csProj);也可以用createFromMapBasicMapBasic字符串來(lái)設(shè)置投影distUnit=LinearUnit.kilometer;DataProviderSearch有時(shí)可能做一些搜索，如搜索配送中心周?chē)牧闶鄣?。MapXtreme提供了豐富的搜索功能。搜索的結(jié)果可以轉(zhuǎn)換為被選中狀態(tài)，從而顯示在地圖上。Search是Layer對(duì)象的方法，有：Vector//AssumemyLayerisaLayerTableInfomyTableInfo=myLayer.getTableInfo();VectorcolumnNames=newVector();intcolumnCount=myTableInfo.getColumnCount();Stringcol;for(intj=0;j<columnCount;{col=myTableInfo.getColumnName(j);}tion，PrimaryKey，rasterDataQueryParams類(lèi)來(lái)過(guò)濾這些信息，以提高程序的性QueryParamsqp=newQueryParams(bGeometry,bRendition,bPrimarykey,bLabelPoint,bRasterInfo,bLabelRendition,SearchType.entire);//findallFeaturesentirelywithinagivensearchregion,returnasingleAttributecolumn//andnoRenditioninformation.Vectorcols=newFeaturesearchFeature =mapj.getFeatureFactory().createRegion(points,rend,attribs,nulQueryParamsqueryParams=newQueryParams(true,false,true,true,true,true,SearchTFeatureSetfs=layer.searchWithinRegion(cols,searchFeature.getGeometry(), Search //AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumns//tobereturned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.{fs=}catch(exception{}//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthedesired//columns tobereturned.AssumeqpistheQueryParamsobject.AssumemyLayer//isaLayerobject.DoublePointdblPt=newDoublePoint(-73.889444,42.765555);doubledRadius=10.03;{fs=myLayer.searchWithinRadius(columnNames,dblPt,dRadius,LinearUnit.}catch(exception{}==>privateboolean{//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumns//tobe returned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.AssumevGeomisaVectorGeometryofTYPE_REGION{fs}catch(Exception{returnfalse;}return}==>//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumns//tobereturned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.DoubleRectdRect=newDoubleRect(-74.092662,42.765555,-73.668898,42.856420);{fs}catch(exception{}//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumns//tobereturned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.DoublePointdp=newDoublePoint(12.3456,-67.890);{fs=}catch(exception{}==>//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumnsto//be returned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.Assumeattristheattributetosearchagainst.AssumecolNameisthecolumnto//searchagainst.{fs}catch(Exception{return}privatebooleanlayerSearchByPrimaryKey(){//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthe//columnstobereturned.AssumeqpistheQueryParamsobject.AssumemyLayer//isaLayerobject.AssumecolNameisthecolumntosearchagainst.Assumepkisa//PrimaryKeyfromaprevioussearch.PrimaryKey[]arraypk=newPrimaryKey[1];arraypk[0]=pk;{fs=}catch(Exception{returnfalse;}return}}eatureFactoryFeaturesearchFeatureSet。AnnotationAnnotationtMapJ，AnnotatinFeaturePrimaryKeyAnnotationFeatureFeatureFactoryFeatureMapJNumericCoordSys。JDBCMapXtremeJavarollback。addFeatureSet，F(xiàn)eaturesFeatureFeatureFeaturePrimaryKeyOracle8iSpatial，IUSwithSpatialWareDataBlade和DB2withSpatialwareExtender1）Oracle8iPrimaryKey1n；FeaturePrimaryKey，F(xiàn)eaturePrimaryKey2）IUSwithSpatialWareDataBladeIUSSW_MEMBERPrimaryKey;PrimaryKey1到n；使用addFeature和receFeature時(shí)都不用指定PrimaryKey，即使指定了，也被忽略addFeature時(shí)不會(huì)返回PrimaryKey。3）DB2withSpatialExtenderPrimaryKeyExtenderPrimaryKey1n；使用addFeature和receFeature時(shí)都不用指定PrimaryKey，即使指定了，也被忽略；PrimaryKey，PrimaryaddFeaturePrimaryKey投影進(jìn)行，TableDescHelperFeatureRendition或LabelRendition的字段，MapXtremeMapXtremeRendtionRenditionType.mapxtremeRenditionType.mapbasicFeature（addFeature）時(shí)，如果Rendition字段的類(lèi)型是RenditionType.mapbasic,保存時(shí)該字段將是null若使用receFeature，MapXtremeJava RangedTheme：按數(shù)據(jù)將地圖分組調(diào)整顯 RangedThemeIndividualvalueThemeAddThemeBeanRenditionOverrideTheme，//AssumemyLayerisaLayer//AssumemyRendisaRenditionOverrideThememyOTheme=newOverrideTheme(myRend,"MyTheme");//AssumelayerasaLayerobjectVectorv=newVector();DoublePointdp=newDoublePoint(x,y);FeatureSetfs=null;//Selectafeatureatthespecifiedlocationfs=layer.searchAtPoint(v,dp,null);//CreateaSelectionThemeselTheme=new//CreateaSelectionobject,andaddtheselectedfeaturesSelectionsel=newSelection();//AssigntheSelectionobjecttotheSelectionTheme//AssignthedisystyleoftheSelectionThemeRenditionrend=RenditionImpl.getDefaultRendition();rend.setvalue(Rendition.FILL,Color.red);//AddtheSelectionThemetothelayer'slistofthemes顯示。MapXtremeLayerRenditionyellow=RenditionImpl.getDefaultRendition();Renditionred=RenditionImpl.getDefaultRendition();lyr=m_map.getLayers().getLayer("States.tab");StringcolName="Pop_1990";ColumnStatisticscolStats//SetnumberofbreaksfordataintnumBreaks=5;//Computethedistributionofdatawith5breaks//EqualVectorrBreaks= //Setuparedandayellowrenditionand//spreadthecolorsyellow.setvalue(Rendition.FILL,Color.yellow);yellow.setvalue(Rendition.STROKE_WIDTH,2);red.setvalue(Rendition.FILL,Color.red);red.setvalue(Rendition.STROKE_WIDTH,4);Vectorrends=LinearRenditionSpreader.spread(numBreaks,yellow,//CreateThemeRangedThemerTheme=newRangedTheme(colName,rBreaks,rends,"StatesbyPop_1990//GetThemeListclassobjectThemeList//AddthemetoLayersthemeListfetchColumnStatisticsColumnStatisticsBucketerColumnStatisticsisticsDISTRIBUTION_TYPE_EQUAL_COUNT（等個(gè)數(shù)DISTRIBUTION_TYPE_EQUAL_RANGES（等范圍DISTRIBUTION_TYPE_STANDARD_DEVIATION（標(biāo)準(zhǔn)差）：以中間值為中心將范圍上標(biāo)準(zhǔn)差分布ditionVector。RangedThemeRendition，//SetuptheVectorrBreaks=newVector();rBreaks.addElement(newAttribute(1));rBreaks.addElement(newAttribute(5));rBreaks.addElement(new//SetuptherenditionsVectorrends=newVector();//CreatearangedthemeRangedThemerTheme=newRangedTheme(themeCol,rBreaks,rends,"Statesby//Assignthemetolayersaselement1//Drawthe//Create poser poser.create(myMap,256,//CreateaMapXtremeImageRendererrenderer=newMapXtremeImageRenderer("http://Renderthemap//Renderthemaptothefile//getareferencetothelayerwewillbeapplyingthemetolyr=lyrs.add(dpr,ttdh,"Territories");//createanewthemeIndividualvalueThemeiValThm=newIndividualvalueTheme("CoverageTerritory","SalesCoverageBreakdown");//createaRendition//assigncolortorenditionaddnrend.setvalue(Rendition.FILL,iValThm.add(newAttribute("SouthWest"),//assigncolortorenditionaddattributerend.setvalue(Rendition.FILL,iValThm.add(newAttribute("SouthEast"),//assigncolortorenditionaddattributerend.setvalue(Rendition.FILL,iValThm.add(newAttribute("Central"),//Addthethemetolayersthemelist//StorecolumnnameandtypeinHashtableht=newHashtable();//Createnewlegendpassingthemeandhashtable.ThesetThemeTitle.IndividualvalueThemeLegendiValThmLeg;iValThmLeg=newIndividualvalueThemeLegend(iValThm,ht);iValThmLeg.setTitle("CovergeTerritorylegend");//GenerategifimagefromlegendiValThmLeg.toFile("c:\\temp\\terrLeg.gif","image/gif");theme.setLegend。ThemerendsasaRenditioncolNameasarBreaksasabreakPointsRangedThemerTheme=newRangedTheme(colName,rBreaks,rends,"Statesby//CreateadefaultRangedThemeLegendrThmLeg//OR,Createathemelegendinstanceusingthemeandsetting//AddthemesettingstohashtableHashtableht=newHashtable();RangedThemeLegendrThmLeg=newRangedThemeLegend(rTheme,ht);//SetlegendtitlerThmLeg.setTitle("RangedThemelegend");//sendlegendtoimagefilerThmLeg.toFile("c:\\temp\\rangeLeg.gif","image/gif");LegendContainerBeanVisualMapJBean如果專(zhuān)題圖改變，LegendContainerBeannfo.legend.CatographicLegend//AssumemapJisalreadyLayerlandmarks=//createthelegendwithtitle"StateLandmarks"CartographicLegendlegend=newCartographicLegend("Staandmarks");//PerformasearchAll()onthelayertogetits//FeatureSet-needtomakesurewefetchthecolumn//wewanttolabelwithinthelegendVectorcolumns=newVector();FeatureSetfs=landmarks.searchAll(columns,//addtheFeatureSettothelegend,andspecifythat//wanttolabeleachfeature'srenditionwiththevalueinthe"Name"columnlegend.addFeatureSet(fs,"Name");//alwaysdisposeofFeatureSetonceyou'redonewithAddThemeBeanVisualMapJAddThemeBeansetVisualMapJ(VisualMapJ)來(lái)指定。BeanDataBindingDataProviderHelper，DataBindingDataProviderHelperLayersTABDataProviderHelpertabDPH=newJDBCDataProviderHelperjdbcDPH=newJDBCDataProviderHelper("jdbc:oracle:thin:@localhost:1521:sid",user,pass,"oracle.jdbc.driver.OracleDriver");DataBindingDataProviderHelperdbDPH=newDataBindingDataProviderHelper(tabDPH,jdbcDPStringtabCols=StringjdbcCols=TABTableDescHelpertabDesc=newJDBCTableDescHelperjdbcDesc=newJDBCTableDescHelper("STATES",null,DataBindingTableDescHelperdbDesc=newDataBindingTableDescHelper(tabDesc,jdbcDesc,tabCols,jdbcCols);DataProviderRefdpRef=newMapXtremeDataProviderRef(dbDPH,mapXtremeURL);Layerlyr=mapj.getLayers().add(dpRef,dbDesc,"DataBinding");sumcountaverage求平均 um求最大MapXtremeCompositeRender。通過(guò)它可以僅僅將某些需要改變的圖層重畫(huà)刷創(chuàng)建一個(gè)臨時(shí)圖層（Annotaion）CompositeRender車(chē)輛象GPS之類(lèi)的應(yīng)用，可以將地圖繪制一次，每次GPS數(shù)據(jù)更新時(shí)，只重畫(huà)車(chē)輛的位置CompositeRender640x4802.7tryThemapjisoftypeMapJandhasloadedaThereqisoftypeTheresisoftypeThedpisoftype//Addannotationlayer-thislayerwillconsistofoneimagesymbolto"animAnnotationTableDescHelperatdh=newAnnotationTableDescHelper("Animation_Layer");AnnotationDataProviderHelperadph=newAnnotationDataProviderHelper();LocalDataProviderRefldpr=newLocalDataProviderRef(adph);//AddtheannotationLayeranimate_layer=mapj.getLayers().insert(ldpr,atdh,0,//CreatetherenditionfortheRenditionr=RenditionImpl.getDefaultRendition();r.setvalue(Rendition.SYMBOL_URL,"file:///C:/images/car.gif");//CreatetheFeatureFactoryff=//AnarraycontainingasingleintAttributeAttribute[]aAIntAttribute={newAttribute(33)};//createanewPrimaryKeyananintegerPrimaryKeypkey=newPrimaryKey(aAIntAttribute);Featuref=ff.createPoint(dp,r,aAIntAttribute,pkey);PrimaryKeypk=animate_layer.addFeature(f);//Create poser poser.create(mapj,256,CreatethecompositerendererRendertheimageStreamtheimagebacktotheCompositeRenderercompositeRenderer=newCompositeRenderer("pxtreme40/servlet/mapxtreme";,0);ServletOutputStreamsos=res.getOutputStream();//Setthisattributetofalsesothatthebottomimageisnotrenderednextti}catch(Exceptione)//Takeappropriateerrorhandling}在地圖中添加空間地圖圖層首先要定義LayerLayerDataProvider。LayerDataProvider，它不是直接由用戶創(chuàng)建的，但是它的描述確實(shí)定義一DataProviderTableDescHelper–DataProviderHelper–DataProviderRef–MapXtreme提供一系列DataProvider，可以如下類(lèi)型的數(shù)據(jù)MapInfotabformatOracle8iwithSpatialInformixUniversalServerSpatialWareDB2SpatialWareJDBCcompatibletablescontaininglongitudeandlatitudeGeoTIFFandMIGridShapefilesDataBindingAnnotationMapXtreme不同數(shù)據(jù)的示意圖 s如：MapInfoTable需要使用TABTableDescHelper，需要table名字參數(shù)。對(duì)于Oracle8i數(shù)據(jù)OraSoTableDescHelper，需要表名或SQL 的數(shù)據(jù)源，源就是.tab。Oracle8iOraSoDataProviderHelper Provider由MapXtremeServlet創(chuàng)建。所有數(shù)據(jù)的組件可以放在中間層MapXtremeServlet處，這樣客戶端就不必都安裝JDBC驅(qū)動(dòng)。這是一個(gè)典型的三次應(yīng)用：應(yīng)用，數(shù)據(jù)處理邏輯，數(shù)據(jù)。注意：何時(shí)數(shù)據(jù)rgetTableInfo，searchrenderLayers.addLayers.insertDataProviderHelpersDataSourceMapInfoTablesOracle8iwithSpatialOptionInformixUniversalServerSpatialWareDataBladeDB2SpatialWareExtenderJDBCcompatibletablescontaininglongitudeandlatitudecolumnsAnnotationLayersGeoTIFFRasterShapefilesDataBinding1ImageIO**Oracle8iOracle8iDataProvider//specifytheurltotheMapXtremeservletwhichremoyconnectsustothemap//engineStringmapXtremeURL= //CreatetheRemoteDataproviderneededtoaccessthe//Usingpooledconnections mended)//UsingDatabasespecificOraSoDataProviderHelperoraSoDPHelper=newOraSoDataProviderHelper("databasename",1000,"DBsid","tester","tester",DriverType.thin);//CreateaStringarraywiththename(s)ofthecolumn(s)touseasauniquekeyforrecordsintheTableNameString[]idColumn=//NowcreateaTableDesc//ThiscodeusestheConstructorrequiredwhenusingaOraSoTableDescHelperoraSoTDHelper=newOraSoTableDescHelper("STATES",false,idColumn,"S_GEOMETRY",null,RenditionType.none,null,RenditionType.none,CoordSys.longLatWGS84,//ThiscodeusestheConstructorrequiredwhenusingaQueryOraSoTableDescHelperoraSoTDHelper=newOraSoTableDescHelper("SelectS_MEMBER,S_GEOMETRY,POP_1990FromSTATESWhereSTATE='NY'",idColumn,"S_GEOMETRY",null,RenditionType.none,null,RenditionType.none,CoordSys.longLatWGS84,2);//CreatetheRemoteDataproviderneededtoaccesstheMapXtremeDataProviderRefmxtDPRef=newMapXtremeDataProviderRef(oraSoDPHelper,mapXtre//assignittoMapJ-notegetLayers()m_myMap.getLayers().add(mxtDP