Java实现地图的导出

package com.lzugis.image;

import sun.misc.BASE64Decoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;

public class MapPrint {

    static int TILE_SIZE = 256;
    static double RES_ZERO = 156543.03392804097;
    static double[] resolutions = new double[19];
    static int ZOOM = 4;

    public static void main(String[] args) {
        long start = new Date().getTime();
        System.out.println("开始出图。。。");
        double res = RES_ZERO;
        for (int i = 0; i < 19; i++) {
            resolutions[i] = res;
            res = res / 2;
        }
        double[] extent = {4816313.49458338, 1168266.6364252055, 19000980.555761307, 7826564.13063698};
        int[] rowCol = getTileRowCol(extent);

        int xmin = rowCol[0];
        int xmax = rowCol[1];
        int ymin = rowCol[2];
        int ymax = rowCol[3];

        int width = (xmax - xmin) * TILE_SIZE;
        int height = (ymax - ymin) * TILE_SIZE;
        try {
            BufferedImage mergeImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics2D graphics2D = mergeImage.createGraphics();
            for (int i = xmin; i <= xmax ; i++) {
                for (int j = ymin; j <= ymax ; j++) {
                    String destUrl = "http://webrd01.is.autonavi.com/appmaptile?x="+i+"&y="+j+"&z="+ZOOM+"&lang=zh_cn&size=1&scale=1&style=8";
                    BufferedImage tile = getBufferedImageDestUrl(destUrl);
                    int x = (i - xmin) * TILE_SIZE;
                    int y = (j -ymin) * TILE_SIZE;
                    graphics2D.drawImage(tile, x, y, TILE_SIZE, TILE_SIZE, null);
                }
            }

            // 添加wms图层
            String extentStr = extent[0]+"," + extent[1]+"," + extent[2]+"," + extent[3];
            String wmsUrl = "http://localhost:8081/geoserver/ecodrought/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&LAYERS=ecodrought%3Apaddy-rice&CRS=EPSG%3A3857&SRS=EPSG%3A3857&WIDTH="+width+"&HEIGHT="+height+"&STYLES=&BBOX="+extentStr;
            BufferedImage wms = getBufferedImageDestUrl(wmsUrl);
            System.out.println(wmsUrl);
            graphics2D.drawImage(wms, 0, 0, width, height, null);

            // 添加地图标题
            String mapTitle = "地图导出测试";
            graphics2D.setColor(new Color(255,0,0,255));

            Font font = new Font("微软雅黑", Font.BOLD, 24);
            graphics2D.setFont(font);
            int length = graphics2D.getFontMetrics(graphics2D.getFont()).charsWidth(mapTitle.toCharArray(), 0, mapTitle.length());
            int posx = 60, posy = 80, offest = 15;
            graphics2D.drawString(mapTitle, posx, posy);
            graphics2D.setStroke(new BasicStroke(2.0f));
            int x1 = posx - offest, y1 = posy - offest - 18, x2 = posx + length + offest, y2 = posy + offest + 6;
            graphics2D.drawLine(x1, y1, x2, y1);
            graphics2D.drawLine(x2, y1, x2, y2);
            graphics2D.drawLine(x2, y2, x1, y2);
            graphics2D.drawLine(x1, y2, x1, y1);

            // 添加指北针
            String base64 = "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";
            int w =50, h = 50, x = width - w - posx;
            graphics2D.drawImage(base64ToBufferedImage(base64), x , posx, w, h, null);

            // 保存图片
            generateSaveFile(mergeImage, "merge.png");

            long end = new Date().getTime();
            System.out.println(String.format("出图结束，耗时%sms", end - start));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取切片行列号
     * @param {double[]} extent - 出图四至，格式为[xmin, ymin, xmax, ymax]
     * @return {int[]} - 切片的行列号范围
     */
    public static int[] getTileRowCol (double[] extent) {
        if(extent.length != 4) return new int[]{};
        double originY = RES_ZERO * TILE_SIZE / 2;
        double originX = -originY;
        double res = resolutions[ZOOM] * TILE_SIZE;
        int xmin = (int) Math.floor((extent[0] - originX) / res);
        int xmax = (int) Math.ceil((extent[2] - originX) / res);
        int ymax = (int) Math.ceil((originY - extent[1]) / res);
        int ymin = (int) Math.floor((originY - extent[3]) / res);
        // 往周围扩充一圈
        return new int[]{ xmin + 1, xmax - 1, ymin + 1, ymax - 1 };
    }

    /**
     * 远程图片转BufferedImage
     * @return {BufferedImage} - 返回图片BufferedImage
     */
    public static BufferedImage getBufferedImageDestUrl(String destUrl) {
        HttpURLConnection conn = null;
        BufferedImage image = null;
        try {
            URL url = new URL(destUrl);
            conn = (HttpURLConnection) url.openConnection();
            if (conn.getResponseCode() == 200) {
                image = ImageIO.read(conn.getInputStream());
                return image;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            conn.disconnect();
        }
        return image;
    }

    /**
     * base64转BufferedImage
     * @param {String} base64
     * @return {BufferedImage}
     * @throws Exception
     */
    public static BufferedImage base64ToBufferedImage(String base64) throws Exception {
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] result = decoder.decodeBuffer(base64);
        InputStream stream = new ByteArrayInputStream(result);
        BufferedImage bufferedImage = ImageIO.read(stream);
        return bufferedImage;
    }

    /**
     * 输出图片
     * @param buffImg  图像拼接叠加之后的BufferedImage对象
     * @param savePath 图像拼接叠加之后的保存路径
     */
    public static void generateSaveFile(BufferedImage buffImg, String savePath) {
        int temp = savePath.lastIndexOf(".") + 1;
        try {
            File outFile = new File(savePath);
            if(!outFile.exists()){
                outFile.createNewFile();
            }
            ImageIO.write(buffImg, savePath.substring(temp), outFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}