項目中遇到一個需求，需要將某個地圖區域的離線地圖下載下來，整理很多網上的資料自己實現根據起始點的經緯度下載離線地圖，代碼如下

import java.io.*; import java.net.URL; import java.net.URLConnection; import java.util.HashMap; import java.util.Map; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream;public class Test {private static final int BUFFER_SIZE = 2 * 1024;public static void main(String[] args) throws Exception {double [] start = new double[]{36.03267263,103.480619123};//最大緯度 最小精度 起點double [] end = new double[]{35.522920921,103.520211928};//最小緯度 最大精度 終點// 36.03267263 103.480619123 35.522920921 103.520211928int [] z = new int[] {8,9};/*** 谷歌地圖地址參數* lyrs = 類型** h = roads only 路線圖* m = standard roadmap* p = terrain 地形圖* r = somehow altered roadmap* s = satellite only 衛星圖* t = terrain only* y = hybrid 混合*/String src = "http://mt0.google.cn/vt/lyrs=m@180000000&hl=zh-CN&gl=cn&x=%s&y=%s&z=%s&s=Ga";String targetDir ="D:\\map";//getGoogleMap(start,end,z,src,targetDir); //獲取谷歌地圖瓦片圖getFileInfo(targetDir);//獲取下載之后的文件信息toZip(targetDir, "D:/map.zip",true);//壓縮下載的文件}/*** 獲取下載之后的文件信息* @param targetDir*/ public static void getFileInfo(String targetDir){File file = new File(targetDir);System.out.println("下載后的文件大小："+file.length()/1024+"M");File[] files = file.listFiles();for (File f : files){String level = f.getName();int count =0;File[] cfiles = f.listFiles();for (File cf : cfiles){count+=cf.list().length;}System.out.println("L"+level+"文件數量: "+count);} } /*** 根據起始點經緯度獲取地圖信息* @param startPoint 數組 如：new double[]{35.522920921,103.480619123};* @param endPoint 數組 如：new double[]{36.033726441,103.520211928};* @param z 地圖級別 new int[] {8,9}; 0-17* @param src 地圖下載地址* @param targetDir 本地保存的路徑* @throws IOException*/ public static void getGoogleMap(double [] startPoint,double [] endPoint,int [] z,String src,String targetDir) throws IOException {// int zoom = 15;double minlat = startPoint[0]; //35.522920921double minlon = startPoint[1];//103.480619123double maxlat = endPoint[0];//36.033726441double maxlon = endPoint[1];//103.520211928for (int k = z[0]; k <= z[1]; k ++){Map<String, Integer> minMap = getTileNumber(minlat, minlon, k);Map<String, Integer> maxMap = getTileNumber(maxlat, maxlon, k);int minX = minMap.get("x");int minY = minMap.get("y") ;int maxX = maxMap.get("x");int maxY = maxMap.get("y");//for (int i = minX; i <= maxX; i++) {for (int j = minY; j <= maxY; j++) {String url = String.format(src, i, j, k);System.out.println(url);downLaodImages(url, i, j, k,targetDir);}}} }/*** 根據經緯度獲取瓦片坐標 算法請參考* https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames* @param lat* @param lon* @param zoom* @return*/ public static Map getTileNumber(final double lat, final double lon, final int zoom) {Map<String,Integer> map = new HashMap<>();int xtile = (int)Math.floor( (lon + 180) / 360 * (1<<zoom) ) ;int ytile = (int)Math.floor( (1 - Math.log(Math.tan(Math.toRadians(lat)) + 1 / Math.cos(Math.toRadians(lat))) / Math.PI) / 2 * (1<<zoom) ) ;if (xtile < 0)xtile=0;if (xtile >= (1<<zoom))xtile=((1<<zoom)-1);if (ytile < 0)ytile=0;if (ytile >= (1<<zoom))ytile=((1<<zoom)-1);map.put("z",zoom);map.put("x",xtile);map.put("y",ytile);return map; }/**** @param url 下載圖片的url* @param x* @param y* @param z* @throws IOException*/ public static void downLaodImages(String url,int x,int y, int z,String targetDir) throws IOException {URL realUrl = new URL(url);// 打開和URL之間的連接URLConnection conn = realUrl.openConnection();// 設置通用的請求屬性conn.setRequestProperty("Accept-Charset", "utf-8");conn.setRequestProperty("contentType", "utf-8");conn.setRequestProperty("accept", "*/*");conn.setRequestProperty("connection", "Keep-Alive");conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");File zFile = new File(targetDir+"\\"+z);if(!zFile.exists()){zFile.mkdir();}File xFile = new File(targetDir+"\\"+z+"\\"+x);if(!xFile.exists()){xFile.mkdir();}DataInputStream dataInputStream = new DataInputStream(conn.getInputStream()) ;;FileOutputStream fileOutputStream = null;//根據坐標 x y z生成文件名 下載png無損圖片String imageName = targetDir+"\\"+z+"\\"+x+"\\"+y+".png";fileOutputStream = new FileOutputStream(new File(imageName));ByteArrayOutputStream output = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int length;while ((length = dataInputStream.read(buffer)) > 0) {output.write(buffer, 0, length);}fileOutputStream.write(output.toByteArray());dataInputStream.close();fileOutputStream.close();output.close();System.out.println("已完成下載！"); }/*** 壓縮*/public static void toZip(String srcDir, String outName, boolean KeepDirStructure)throws RuntimeException{long start = System.currentTimeMillis();ZipOutputStream zos = null ;try {FileOutputStream out= new FileOutputStream(new File(outName));zos = new ZipOutputStream(out);File sourceFile = new File(srcDir);compress(sourceFile,zos,sourceFile.getName(),KeepDirStructure);long end = System.currentTimeMillis();System.out.println("壓縮完成，耗時：" + (end - start) +" ms");} catch (Exception e) {throw new RuntimeException("zip error",e);}finally{if(zos != null){try {zos.close();} catch (IOException e) {e.printStackTrace();}}}} private static void compress(File sourceFile, ZipOutputStream zos, String name,boolean KeepDirStructure) throws Exception{byte[] buf = new byte[BUFFER_SIZE];if(sourceFile.isFile()){// 向zip輸出流中添加一個zip實體，構造器中name為zip實體的文件的名字zos.putNextEntry(new ZipEntry(name));// copy文件到zip輸出流中int len;FileInputStream in = new FileInputStream(sourceFile);while ((len = in.read(buf)) != -1){zos.write(buf, 0, len);}// Complete the entryzos.closeEntry();in.close();} else {//是文件夾File[] listFiles = sourceFile.listFiles();if(listFiles == null || listFiles.length == 0){// 需要保留原來的文件結構時,需要對空文件夾進行處理if(KeepDirStructure){// 空文件夾的處理zos.putNextEntry(new ZipEntry(name + "/"));// 沒有文件，不需要文件的copyzos.closeEntry();}}else {for (File file : listFiles) {// 判斷是否需要保留原來的文件結構if (KeepDirStructure) {// 注意：file.getName()前面需要帶上父文件夾的名字加一斜杠,// 不然最后壓縮包中就不能保留原來的文件結構,即：所有文件都跑到壓縮包根目錄下了compress(file, zos, name + "/" + file.getName(),KeepDirStructure);} else {compress(file, zos, file.getName(),KeepDirStructure);}}}}}}

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