概述：
在前面有1篇文章中讲到了GDAL将shp转换为GeoJson的实现，和ol2、3和Arcgis for Js中GeoJson的加载，今天呢，书接上文，介绍Geotools如何读取shp文件并在ol2中展现。
读取shp
package com.lzugis.web;import net.sf.Json.JsONArray;import org.geotools.data.shapefile.ShapefileDataStore;import org.geotools.data.simple.SimpleFeatureCollection;import org.geotools.data.simple.SimpleFeatureIterator;import org.geotools.data.simple.SimpleFeatureSource;import org.opengis.feature.Property;import org.opengis.feature.simple.SimpleFeature;import org.opengis.feature.type.PropertyType;import javax.servlet.servletexception;import javax.servlet.annotation.WebServlet;import javax.servlet.http.httpServlet;import javax.servlet.http.httpServletRequest;import javax.servlet.http.httpServletResponse;import java.io.file;import java.io.IOException;import java.io.PrintWriter;import java.nio.charset.Charset;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.*;@WebServlet(description = "read shape",urlPatterns = {"/shp"})public class ReadShape extends httpServlet { protected voID doPost(httpServletRequest request,httpServletResponse response) throws servletexception,IOException { String layer = request.getParameter("layer"); String shpPath = "D:\data\china\"+layer+".shp"; System.out.println(shpPath); ShapefileDataStore shpDataStore = null; Calendar startTime = Calendar.getInstance(); List<Map<String,Object>> List = new ArrayList<Map<String,Object>>(); try{ file file = new file (shpPath); shpDataStore = new ShapefileDataStore(file.toURL()); //设置字符编码 Charset charset = Charset.forname("GBK"); shpDataStore.setCharset(charset); String typename = shpDataStore.getTypenames()[0]; SimpleFeatureSource featureSource = null; featureSource = shpDataStore.getFeatureSource (typename); SimpleFeatureCollection result = featureSource.getFeatures(); SimpleFeatureIterator itertor = result.features(); while (itertor.hasNext()) { Map<String,Object> data = new HashMap<String,Object>(); SimpleFeature feature = itertor.next(); Collection<Property> p = feature.getPropertIEs(); Iterator<Property> it = p.iterator(); while(it.hasNext()) { Property pro = it.next(); String fIEld = pro.getname().toString(); String value = pro.getValue().toString(); fIEld = fIEld.equals("the_geom")?"wkt":fIEld; data.put(fIEld,value); } List.add(data); } Calendar endTime = Calendar.getInstance(); int day = endTime.get(Calendar.DAY_OF_MONTH) - startTime.get(Calendar.DAY_OF_MONTH); int hour = endTime.get(Calendar.HOUR_OF_DAY) - startTime.get(Calendar.HOUR_OF_DAY); int minute = endTime.get(Calendar.MINUTE) - startTime.get(Calendar.MINUTE); int second = endTime.get(Calendar.SECOND) - startTime.get(Calendar.SECOND); itertor.close(); System.out.println("共写入" + List.size() + "条数据，耗时" + day + "天" + hour + "时" + minute + "分" + second + "秒"); response.setContentType("text/HTML;charset=utf⑻"); PrintWriter out = response.getWriter(); JsONArray Jsonarray = JsONArray.fromObject(List); out.println(Jsonarray); out.flush(); out.close(); } catch(Exception e){ System.out.println(e.getMessage()); } } protected voID doGet(httpServletRequest request,IOException { this.doPost(request,response); }}返回的数据以下：
展现数据
<!DOCTYPE HTML><HTML><head lang="en"> <Meta charset="UTF⑻"> <Title>openlayers map</Title> <link rel="stylesheet" type="text/CSS" href="http://dev.openlayers.org/theme/default/style.CSS"/> <style> HTML,body{ padding:0; margin:0; height:100%; wIDth:100%; overflow: hIDden; Font-size: 12px; } #map1{ wIDth: 100%; height: 100%; float: left; border-right: 1px solID #000000; } .tool{ position: absolute; top:10pt; right: 10pt; padding: 5px; background: #fff; border: 1px solID #ff5500; z-index: 1000; } </style> <script type="text/JavaScript" src="http://dev.openlayers.org/OpenLayers.Js"></script> <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.Js"></script> <script> var map1,vectors; OpenLayers.Feature.Vector.style['default']['strokeWIDth'] = '2'; $(function(){ var bounds = new OpenLayers.Bounds( 73.45100463562233,18.16324718764174,134.97679764650596,53.531943152223576 ); var options = { controls: [],maxExtent: bounds,maxResolution: 0.2403351289487642,projection: "epsg:4326",units: 'degrees' }; map1 = new OpenLayers.Map('map1',options); map1.addLayer(getWms("province")); map1.addControl(new OpenLayers.Control.Zoom()); map1.addControl(new OpenLayers.Control.Navigation()); map1.zoomToExtent(bounds); $("#addchart").on("click",function(){ addShpData(); }); }); function getWms(layer){ return new OpenLayers.Layer.WMS( "Geoserver layers - Tiled","http://localhost:8088/geoserver/lzugis/wms",{ "LAYERS": layer,"STYLES": '',format: 'image/png' },{ buffer: 0,displayOutsIDeMaxExtent: true,isBaseLayer: true,yx : {'epsg:4326' : true} } ); } function addShpData(){ var renderer = OpenLayers.Util.getParameters(window.location.href).renderer; renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers; vectors = new OpenLayers.Layer.Vector("Vector Layer",{ renderers: renderer }); map1.addLayer(vectors); var wktFormat = new OpenLayers.Format.WKT(); $.AJAX({ type: 'POST',url: "http://localhost:8081/lzugis/shp",data: { layer:"cAPItal" },success: function(data){ data = eval("("+data+")"); console.log(data); for(var i= 0,dl=data.length;i<dl;i++){ var d = data[i]; var geometry = wktFormat.read(d.wkt); vectors.addFeatures(geometry); } } }); } </script></head><body><div class="tool"> <button ID="addchart">读取shp</button></div><div ID="map1"></div></body></HTML>实现后效果以下：
附录
本实例相干Geotools jar下载地址：链接：http://pan.baIDu.com/s/1o8xTUXW 密码：u601
Geotools12.2 jar下载地址：链接：http://pan.baIDu.com/s/1pKDkI19 密码：687y
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