下载谷歌离线地图瓦片图「建议收藏」

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};//最大纬度 最小精度 起点
double [] end = new double[]{35.522920921,103.520211928};//最小纬度  最大精度  终点
// 36.03267263 103.480619123 35.522920921 103.520211928
int [] z = new int[] {8,9};
/**
* 谷歌地图地址参数
* lyrs = 类型
*
* h = roads only 路线图
* m = standard roadmap
* p = terrain 地形图
* r = somehow altered roadmap
* s = satellite only 卫星图
* 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); //获取谷歌地图瓦片图
getFileInfo(targetDir);//获取下载之后的文件信息
toZip(targetDir, "D:/map.zip",true);//压缩下载的文件
}
/**
* 获取下载之后的文件信息
* @param targetDir
*/
public static  void getFileInfo(String targetDir){
File file = new File(targetDir);
System.out.println("下载后的文件大小："+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+"文件数量: "+count);
}
}
/**
* 根据起始点经纬度获取地图信息
* @param startPoint 数组 如：new double[]{35.522920921,103.480619123};
* @param endPoint 数组 如：new double[]{36.033726441,103.520211928};
* @param z 地图级别 new int[] {8,9}; 0-17
* @param src 地图下载地址
* @param targetDir 本地保存的路径
* @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]; //35.522920921
double minlon = startPoint[1];//103.480619123
double maxlat = endPoint[0];//36.033726441
double maxlon = endPoint[1];//103.520211928
for (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);
}
}
}
}
/**
* 根据经纬度获取瓦片坐标 算法请参考
* 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 下载图片的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);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
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;
//根据坐标 x y z生成文件名 下载png无损图片
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("已完成下载！");
}
/**
* 压缩
*/
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("压缩完成，耗时：" + (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输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
zos.putNextEntry(new ZipEntry(name));
// copy文件到zip输出流中
int len;
FileInputStream in = new FileInputStream(sourceFile);
while ((len = in.read(buf)) != -1){
zos.write(buf, 0, len);
}
// Complete the entry
zos.closeEntry();
in.close();
} else {
//是文件夹
File[] listFiles = sourceFile.listFiles();
if(listFiles == null || listFiles.length == 0){
// 需要保留原来的文件结构时,需要对空文件夹进行处理
if(KeepDirStructure){
// 空文件夹的处理
zos.putNextEntry(new ZipEntry(name + "/"));
// 没有文件，不需要文件的copy
zos.closeEntry();
}
}else {
for (File file : listFiles) {
// 判断是否需要保留原来的文件结构
if (KeepDirStructure) {
// 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
// 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
compress(file, zos, name + "/" + file.getName(),KeepDirStructure);
} else {
compress(file, zos, file.getName(),KeepDirStructure);
}
}
}
}
}
}