用geotools自己写WMS服务
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概述
本文讲述如何结合geotools写一个类似于WMS的地图服务，并实现在OL4中的调用展示。
效果
实现
- 后端代码
在后端，先创建一个MapContent，再添加一个layer并通过一个sld文件给layer设置样式，最后通过servlet实现WMS服务的转发，代码如下：
package com.lzugis.web.servlet;import com.lzugis.web.helper.CommonConfig;import org.geotools.data.shapefile.ShapefileDataStore;import org.geotools.data.simple.SimpleFeatureSource;import org.geotools.factory.CommonFactoryFinder;import org.geotools.geometry.jts.ReferencedEnvelope;import org.geotools.map.FeatureLayer;import org.geotools.map.Layer;import org.geotools.map.MapContent;import org.geotools.referencing.CRS;import org.geotools.renderer.lite.StreamingRenderer;import org.geotools.styling.SLD;import org.geotools.styling.SLDParser;import org.geotools.styling.Style;import org.geotools.styling.StyleFactory;import org.geotools.swing.JMapFrame;import org.opengis.referencing.crs.CoordinateReferenceSystem;import javax.imageio.ImageIO;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.awt.*;import java.awt.image.BufferedImage;import java.io.*;import java.nio.charset.Charset;import java.util.HashMap;import java.util.Map;/** * Created by lzugis on 2017/9/10. */@WebServlet(description = "wms services", urlPatterns = {"/wms"})public class WmsServiceServlet extends HttpServlet { private static MapContent map = null; public WmsServiceServlet() { super(); try{ String shpPath = "", sldPath = ""; shpPath = CommonConfig.getVal("wms.shp"); sldPath = CommonConfig.getVal("wms.sld"); map = new MapContent(); this.addShapeLayer(shpPath, sldPath); } catch(Exception e){ e.printStackTrace(); } } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String LAYERS = request.getParameter("LAYERS"), WIDTH = request.getParameter("WIDTH"), HEIGHT = request.getParameter("HEIGHT"), BBOX = request.getParameter("BBOX"); int _w = Integer.parseInt(WIDTH), _h = Integer.parseInt(HEIGHT); String[] BBOXS = BBOX.split(","); double[] _bbox = new double[]{ Double.parseDouble(BBOXS[0]), Double.parseDouble(BBOXS[1]), Double.parseDouble(BBOXS[2]), Double.parseDouble(BBOXS[3]) }; Map paras = new HashMap(); paras.put("bbox", _bbox); paras.put("width", _w); paras.put("height", _h); this.getMapContent(paras, response); } private void addShapeLayer(String shpPath, String sldPath){ try { File file = new File(shpPath); ShapefileDataStore shpDataStore = null; shpDataStore = new ShapefileDataStore(file.toURL()); //设置编码 Charset charset = Charset.forName("GBK"); shpDataStore.setCharset(charset); String typeName = shpDataStore.getTypeNames()[0]; SimpleFeatureSource featureSource = null; featureSource = shpDataStore.getFeatureSource(typeName); Style style = SLD.createSimpleStyle(featureSource.getSchema()); if (sldPath != "") { //SLD的方式 File sldFile = new File(sldPath); StyleFactory styleFactory = CommonFactoryFinder.getStyleFactory(); SLDParser stylereader = new SLDParser(styleFactory, sldFile.toURI().toURL()); Style[] stylearray = stylereader.readXML(); style = stylearray[0]; } else { SLD.setPolyColour(style, Color.RED); } Layer layer = new FeatureLayer(featureSource, style); map.addLayer(layer); } catch(Exception e){ e.printStackTrace(); } } private void getMapContent(Map paras, HttpServletResponse response){ try{ double[] bbox = (double[]) paras.get("bbox"); double x1 = bbox[0], y1 = bbox[1], x2 = bbox[2], y2 = bbox[3]; int width = (Integer) paras.get("width"), height=(Integer) paras.get("height"); // 设置输出范围 CoordinateReferenceSystem crs = CRS.decode("EPSG:3857"); ReferencedEnvelope mapArea = new ReferencedEnvelope(x1, x2, y1, y2, crs); // 初始化渲染器 StreamingRenderer sr = new StreamingRenderer(); sr.setMapContent(map); // 初始化输出图像 BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); Graphics g = bi.getGraphics(); ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); Rectangle rect = new Rectangle(0, 0, width, height); // 绘制地图 sr.paint((Graphics2D) g, rect, mapArea); ByteArrayOutputStream out = new ByteArrayOutputStream(); boolean flag = ImageIO.write(bi, "png", out); byte[] wmsByte = out.toByteArray(); OutputStream os = response.getOutputStream(); InputStream is = new ByteArrayInputStream(wmsByte); try { int count = 0; byte[] buffer = new byte[1024 * 1024]; while ((count = is.read(buffer)) != -1) { os.write(buffer, 0, count); } os.flush(); } catch (IOException e) { e.printStackTrace(); } finally { os.close(); is.close(); } } catch(Exception e){ e.printStackTrace(); } }}- 前段代码
<html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title>Ol3 wms</title> <link rel="stylesheet" type="text/css" href="plugin/ol4/ol.css"/> <style type="text/css"> body, #map { border: 0px; margin: 0px; padding: 0px; width: 100%; height: 100%; font-size: 13px; } </style> <script type="text/javascript" src="plugin/ol4/ol.js"></script> <script type="text/javascript" src="plugin/jquery/jquery-3.1.1.min.js"></script> <script type="text/javascript"> var map; function init() { var vec_w = getTdtLayer("ter_w"); var wms = new ol.layer.Image({ source: new ol.source.ImageWMS({ ratio: 1, url: 'wms', params: { "LAYERS": 'ordosMap' } }) }); var wms = new ol.layer.Tile({ visible: true, source: new ol.source.TileWMS({ url: 'wms', params: { tiled: true, LAYERS: 'lzugis:capital' } }) }); var projection = new ol.proj.Projection({ code: 'EPSG:3857', units: 'm' }); map = new ol.Map({ controls: ol.control.defaults({ attribution: false }), target: 'map', layers: [ vec_w, wms ], view: new ol.View({ projection: projection, center: [0, 0], zoom: 1 }) }); } function getTdtLayer(lyr) { var url = "http://t0.tianditu.com/DataServer?T=" + lyr + "&X={x}&Y={y}&L={z}"; var layer = new ol.layer.Tile({ source: new ol.source.XYZ({ url: url }) }); return layer; } </script></head><body onLoad="init()"><div id="map"></div></body></html>技术博客
CSDN：http://blog.csdn.NET/gisshixisheng
博客园：http://www.cnblogs.com/lzugis/
在线教程
http://edu.csdn.Net/course/detail/799
Github
https://github.com/lzugis/
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