29.地图打印之java-geotools+awt

紫雪giser

已于 2023-11-30 14:11:08 修改

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分类专栏： gis开发学习文章标签： java

于 2023-11-30 14:10:26 首次发布

本文链接：https://blog.csdn.net/yaojindou0/article/details/134711065

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本文介绍了一个使用Java编写的函数，处理多个Shp文件，定义地图导出参数（如坐标范围和尺寸），并应用SLD样式文件来生成地图。涉及Shapefile读取、ShapefileDataStore和FeatureSource操作以及地图内容渲染。

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数据准备

1.若干shp文件及类型 shplist
2.打印坐标范围bbox
3.图片宽高height、width
4.导出图片路径outimgpath
5.点线面sld样式文件（点击可下载）

{mapexportparam：{bbox: [104, 40, 112, 31],height: 1024,width: 1024},
outimgpath: "D:/gisdata/gp/bbb.png",
shplist: [{filepath:"D:/gisdata/gp/city.shp", type: "poylgon"}]
}

代码

private static void exportImage(List<Map<String, Object>> shplist,Map<String, Object> mapexportparam：,String outimgpath) {
    for (Map<String, Object> mapp : shplistlist) {

        addShapeLayer(mapp.get("filepath").toString(),"src/main/resources/template/"+mapp.get("type").toString()+"style.sld");
    }

    getMapContent(mapexportparam：,outimgpath);
}

public static void addShapeLayer(String shpPath, String sldPath) {
		try {
			File file = new File(shpPath);
			ShapefileDataStore shpDataStore = null;
			shpDataStore = new ShapefileDataStore(file.toURI().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);
			// 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 style = stylearray[0];
//			  默认的方式
//		    Style style = SLD.createSimpleStyle(featureSource.getSchema());
//		    SLD.setPolyColour(style, Color.RED );
			Layer layer = new FeatureLayer(featureSource, style);
			map.addLayer(layer);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

    // 导出地图
	public static void getMapContent(Map<String,Object> paras, String imgPath) {
		try {
			double[] bbox = (double[]) paras.get("bbox");
			double x1 = bbox[0], y1 = bbox[1], x2 = bbox[2], y2 = bbox[3];
			int width = (int) paras.get("width"), height = (int) paras.get("height");
			// 设置输出范围
			CoordinateReferenceSystem crs = DefaultGeographicCRS.WGS84;
			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);
			// 将BufferedImage变量写入文件中。
			ImageIO.write(bi, "png", new File(imgPath));

		} catch (Exception e) {
			e.printStackTrace();
		}
	}