Java调用echarts提供的地图压缩方法来压缩地图

由于默认情况下的 GeoJSON 文件太大，ECharts 提供了方法可以压缩地图。

GeoJSON 介绍：http://geojson.org/

ECharts 提供了压缩算法，但是代码是 JavaScript 的，参考代码写个 Java 的也可以，但是通过 Java 提供的脚本引擎可以很方便的直接执行 JS。

本文压缩代码参考下面的项目：

https://github.com/giscafer/mapshaper-plus
这里的算法也是来源于 ECharts

从该项目提取出压缩地图的 JS 代码，简化后如下：

function convert2Echarts(rawStr,fileName,type){
  var results="";
  var json = JSON.parse(rawStr);
  // Meta tag
  json.UTF8Encoding = true;
  var features = json.features;
  if (!features) {
    return;
  }
  features.forEach(function (feature){
    var encodeOffsets = feature.geometry.encodeOffsets = [];
    var coordinates = feature.geometry.coordinates;
    if (feature.geometry.type === 'Polygon') {
      coordinates.forEach(function (coordinate, idx){
        coordinates[idx] = encodePolygon(
          coordinate, encodeOffsets[idx] = []
        );
      });
    } else if(feature.geometry.type === 'MultiPolygon') {
      coordinates.forEach(function (polygon, idx1){
        encodeOffsets[idx1] = [];
        polygon.forEach(function (coordinate, idx2) {
          coordinates[idx1][idx2] = encodePolygon(
            coordinate, encodeOffsets[idx1][idx2] = []
          );
        });
      });
    }
  });
  if(type==='json'){
    results=JSON.stringify(json);
  }else{
    results=addEchartsJsWrapper(JSON.stringify(json), fileName);
  }
  return results;
};
function encodePolygon(coordinate, encodeOffsets) {
  var result = '';
  var prevX = quantize(coordinate[0][0]);
  var prevY = quantize(coordinate[0][1]);
  // Store the origin offset
  encodeOffsets[0] = prevX;
  encodeOffsets[1] = prevY;
  for (var i = 0; i < coordinate.length; i++) {
    var point = coordinate[i];
    result+=encode(point[0], prevX);
    result+=encode(point[1], prevY);
    prevX = quantize(point[0]);
    prevY = quantize(point[1]);
  }
  return result;
}
function addAMDWrapper(jsonStr) {
  return ['define(function() {',
    '  return ' + jsonStr + ';',
    '});'].join('\n');
}
function addEchartsJsWrapper(jsonStr,fileName) {
  return ['(function (root, factory) {',
    "  if (typeof define === 'function' && define.amd) {",
    "    define(['exports', 'echarts'], factory);",
    "  } else if (typeof exports === 'object' && typeof exports.nodeName !== 'string') {",
    "    factory(exports, require('echarts'));",
    "  } else {",
    "    factory({}, root.echarts);",
    "  }",
    " }(this, function (exports, echarts) {",
    "    var log = function (msg) {",
    "      if (typeof console !== 'undefined') {",
    "        console && console.error && console.error(msg);",
    "      }",
    "    }",
    " if (!echarts) {",
    "    log('ECharts is not Loaded');",
    "      return;",
    "    }",
    " if (!echarts.registerMap) {",
    "    log('ECharts Map is not loaded')",
    "    return;",
    " }",
    " echarts.registerMap('"+fileName+"',"+ jsonStr,
    ' )}));'].join('\n');
}
function encode(val, prev){
  // Quantization
  val = quantize(val);
  // var tmp = val;
  // Delta
  val = val - prev;
  if (((val << 1) ^ (val >> 15)) + 64 === 8232) {
    //WTF, 8232 will get syntax error in js code
    val--;
  }
  // ZigZag
  val = (val << 1) ^ (val >> 15);
  // add offset and get unicode
  return String.fromCharCode(val+64);
  // var tmp = {'tmp' : str};
  // try{
  //   eval("(" + JSON.stringify(tmp) + ")");
  // }catch(e) {
  //   console.log(val + 64);
  // }
}
function quantize(val) {
  return Math.ceil(val * 1024);
}

一个河北省的 GeoJSON 示例（文件大小为 55 kb）：

{"type": "FeatureCollection",
"cp":[115.4004,39.4688],
"size":"1300",
"features":
[
{"type": "Feature","properties":{"id":"1308","name":"承德市","cp":[117.5757,41.4075],"childNum":11},"geometry":{"type":"Polygon","coordinates":[[[116.0815,41.781],[116.1035,41.7865],[116.1255,41.8085],[116.1035,41.8359],[116.1255,41.8689],[116.1584,41.8634],[116.1694,41.8744],[116.1914,41.8634],[116.2134,41.8799],[116.2134,41.8909],[116.2244,41.9183],[116.2354,41.9238],[116.2244,41.9293],[116.2244,41.9348],[116.3013,41.9733],[116.3123,41.9952],[116.3342,42.0062],[116.3672,42.0117],[116.4111,41.9952],[116.4111,41.9678],[116.3892,41.9458],[116.4331,41.9403],[116.4661,41.9568],[116.499,41.9843],[116.532,41.9568],[116.543,41.9348],[116.5869,41.9238],[116.5979,41.9348],[116.6418,41.9293],[116.6638,41.9458],[116.7188,41.9403],[116.7188,41.9623],[116.7297,41.9733],[116.7407,41.9897],[116.7737,41.9952],[116.7737,41.9843],[116.7957,41.9733],[116.8506,42.0062],[116.8726,42.0007],[116.8835,42.0227],[116.8726,42.0282],[116.8835,42.0557],[116.8835,42.0667],[116.8945,42.0831],[116.8945,42.1051],[116.8286,42.1655],[116.8066,42.1765],[116.7957,42.1875],[116.8176,42.204],[116.9055,42.1875],[116.9165,42.1985],[116.9165,42.2534],[116.9055,42.2699],[116.9055,42.2919],[116.8945,42.3083],[116.9055,42.3523],[116.9055,42.3688],[116.9055,42.3853],[116.9165,42.4017],[116.9714,42.4292],[117.0044,42.4292],[117.0154,42.4567],[117.0813,42.4622],[117.0923,42.4841],[117.1362,42.4677],[117.2021,42.4677],[117.2791,42.4841],[117.334,42.4622],[117.3889,42.4622],[117.4109,42.4731],[117.3999,42.5116],[117.3999,42.5226],[117.4219,42.5226],[117.4329,42.5116],[117.4658,42.5171],[117.4768,42.5336],[117.4768,42.583],[117.4878,42.594],[117.5317,42.5885],[117.5427,42.5995],[117.5537,42.605],[117.5757,42.583],[117.6306,42.5665],[117.8064,42.616],[117.8064,42.5995],[117.7954,42.594],[117.8064,42.5775],[117.8394,42.561],[117.8613,42.5391],[117.8723,42.4951],[117.9272,42.4731],[117.9602,42.4292],[117.9712,42.4292],[118.0042,42.4127],[118.0261,42.3853],[118.0151,42.3468],[118.0261,42.3193],[118.0591,42.3083],[118.0591,42.2864],[117.9712,42.2424],[118.0261,42.2095],[118.0481,42.193],[118.103,42.182],[118.114,42.171],[118.103,42.149],[118.092,42.1106],[118.158,42.0831],[118.158,42.0612],[118.136,42.0667],[118.147,42.0557],[118.114,42.0447],[118.125,42.0392],[118.158,42.0282],[118.2019,42.0337],[118.2239,42.0557],[118.2239,42.0831],[118.2458,42.0941],[118.2678,42.0886],[118.3008,42.0557],[118.2788,42.0282],[118.2678,42.0282],[118.2349,42.0172],[118.2898,42.0062],[118.3008,41.9897],[118.3118,41.9897],[118.3008,41.9403],[118.2678,41.9293],[118.2678,41.9183],[118.3337,41.8744],[118.3337,41.8579],[118.3447,41.8469],[118.3228,41.8359],[118.3118,41.781],[118.2788,41.7645],[118.2678,41.7645],[118.2568,41.77],[118.2458,41.781],[118.2458,41.7975],[118.2239,41.814],[118.2019,41.8085],[118.1909,41.814],[118.1689,41.8085],[118.147,41.7975],[118.158,41.7865],[118.136,41.7645],[118.147,41.759],[118.136,41.7316],[118.158,41.7206],[118.1689,41.6821],[118.2239,41.6382],[118.2129,41.6162],[118.2349,41.5833],[118.2898,41.5723],[118.2898,41.5613],[118.3228,41.5668],[118.3118,41.5393],[118.3228,41.5173],[118.3228,41.5063],[118.3118,41.5009],[118.3118,41.4844],[118.2788,41.4789],[118.2678,41.4679],[118.3447,41.4514],[118.3557,41.424],[118.3557,41.391],[118.3667,41.3855],[118.3557,41.3745],[118.3557,41.3525],[118.3667,41.347],[118.3557,41.3361],[118.3777,41.3141],[118.3997,41.3086],[118.4106,41.3196],[118.4216,41.3361],[118.4875,41.347],[118.5095,41.3416],[118.5315,41.358],[118.5425,41.3525],[118.5864,41.3525],[118.6084,41.347],[118.6523,41.347],[118.6743,41.358],[118.6963,41.3306],[118.7073,41.3361],[118.7183,41.3306],[118.7512,41.3251],[118.7842,41.358],[118.8281,41.369],[118.8501,41.3855],[118.8501,41.369],[118.8391,41.3635],[118.8501,41.3525],[118.8501,41.347],[118.8721,41.3031],[118.927,41.3031],[118.949,41.3141],[118.9709,41.3086],[119.0149,41.3086],[119.0369,41.2976],[119.1467,41.2976],[119.2017,41.2866],[119.2126,41.2921],[119.2126,41.3086],[119.2456,41.3086],[119.2566,41.2811],[119.2456,41.2701],[119.2126,41.2537],[119.2126,41.2262],[119.1797,41.2262],[119.1687,41.2152],[119.1907,41.2042],[119.1907,41.1932],[119.1248,41.1383],[119.0808,41.1328],[119.0808,41.0944],[119.0698,41.0724],[119.0479,41.0779],[119.0369,41.0614],[118.96,41.0779],[118.938,41.0559],[118.938,41.0339],[118.949,41.0175],[119.0259,41.0065],[119.0259,40.99],[119.0039,40.968],[118.9709,40.957],[118.938,40.957],[118.916,40.968],[118.905,40.9625],[118.8831,40.8691],[118.8501,40.8197],[118.8501,40.8032],[118.8831,40.7813],[118.905,40.7813],[118.894,40.7593],[118.949,40.7483],[118.96,40.7208],[118.9819,40.7043],[119.0149,40.6879],[119.0369,40.6879],[119.0588,40.6659],[119.0808,40.6769],[119.1028,40.6659],[119.1577,40.6934],[119.1797,40.6824],[119.1797,40.6659],[119.1467,40.6384],[119.1577,40.6055],[119.1138,40.6055],[119.0808,40.589],[119.0588,40.6055],[118.96,40.556],[118.9709,40.5341],[118.96,40.5341],[118.927,40.5286],[118.894,40.5396],[118.8611,40.5286],[118.8281,40.5341],[118.7952,40.5121],[118.7842,40.4901],[118.7732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{"type": "Feature","properties":{"id":"1310","name":"廊坊市","cp":[116.521,39.0509],"childNum":9},"geometry":{"type":"MultiPolygon","coordinates":[[[[116.2463,39.5178],[116.2683,39.5013],[116.3013,39.4904],[116.3452,39.4519],[116.3892,39.4519],[116.4331,39.4409],[116.4551,39.4464],[116.4551,39.4574],[116.4441,39.4739],[116.4221,39.4958],[116.4111,39.5233],[116.4331,39.5178],[116.4441,39.5288],[116.4771,39.5398],[116.4771,39.5508],[116.51,39.5563],[116.532,39.5728],[116.521,39.5947],[116.5649,39.6057],[116.5759,39.6222],[116.5979,39.6222],[116.5979,39.6167],[116.6309,39.5947],[116.6418,39.5947],[116.6418,39.6057],[116.6968,39.5947],[116.7078,39.5892],[116.7297,39.5947],[116.7078,39.6167],[116.7627,39.6167],[116.7847,39.5947],[116.7957,39.6112],[116.8176,39.6167],[116.8176,39.6002],[116.7957,39.5947],[116.8066,39.5782],[116.7847,39.5508],[116.8066,39.5288],[116.8176,39.5288],[116.8176,39.5343],[116.8286,39.5178],[116.8066,39.5013],[116.8176,39.4849],[116.7847,39.4684],[116.7957,39.4574],[116.7957,39.4464],[116.8176,39.4519],[116.8286,39.4354],[116.8506,39.4409],[116.8726,39.4299],[116.8506,39.4135],[116.8396,39.4135],[116.8286,39.397],[116.8396,39.3805],[116.8176,39.375],[116.8176,39.3695],[116.8396,39.364],[116.8286,39.353],[116.8286,39.3365],[116.8506,39.3365],[116.8726,39.3585],[116.8726,39.342],[116.8945,39.3365],[116.8835,39.3036],[116.8616,39.2981],[116.8726,39.2816],[116.8726,39.2651],[116.8726,39.2432],[116.8945,39.2267],[116.8835,39.2212],[116.8726,39.2322],[116.8726,39.2212],[116.8506,39.2102],[116.8616,39.1553],[116.9055,39.1498],[116.9165,39.1168],[116.9275,39.1168],[116.9055,39.1058],[116.8835,39.0729],[116.8726,39.0729],[116.8726,39.0564],[116.8176,39.0509],[116.7957,39.0564],[116.7847,39.0454],[116.7847,39.0564],[116.7957,39.0564],[116.7847,39.0619],[116.7847,39.0509],[116.7517,39.0509],[116.7517,39.0399],[116.7627,39.0289],[116.7517,39.0125],[116.7517,39.0015],[116.7297,38.974],[116.7078,38.9301],[116.7078,38.8971],[116.7188,38.8971],[116.7188,38.8696],[116.7188,38.8531],[116.7407,38.8531],[116.7407,38.8367],[116.7517,38.8312],[116.7407,38.8092],[116.7517,38.7982],[116.7407,38.7872],[116.7517,38.7762],[116.7407,38.7543],[116.7627,38.7488],[116.7627,38.7433],[116.7627,38.6993],[116.7847,38.6499],[116.7627,38.6389],[116.7078,38.6224],[116.6638,38.5785],[116.6528,38.5675],[116.6638,38.54],[116.6528,38.5126],[116.6199,38.5126],[116.6199,38.5071],[116.6199,38.4961],[116.6089,38.4851],[116.5869,38.4851],[116.5869,38.4741],[116.5649,38.4741],[116.5649,38.4961],[116.554,38.5016],[116.543,38.5016],[116.532,38.4906],[116.4771,38.4906],[116.4551,38.5071],[116.4441,38.5291],[116.4331,38.5345],[116.4551,38.5785],[116.3892,38.6115],[116.3672,38.6719],[116.3672,38.6938],[116.3892,38.6993],[116.4331,38.7213],[116.4331,38.7488],[116.4221,38.7708],[116.3342,38.8092],[116.3013,38.8147],[116.2683,38.8367],[116.2463,38.8477],[116.2354,38.8751],[116.2024,38.8861],[116.2024,38.9081],[116.1914,38.9246],[116.2244,38.9191],[116.2573,38.9355],[116.3123,38.9575],[116.3342,38.9795],[116.2903,39.0015],[116.3123,39.0399],[116.3232,39.0948],[116.2683,39.1223],[116.2683,39.1278],[116.2463,39.1443],[116.2134,39.1498],[116.2024,39.1827],[116.2134,39.2102],[116.1914,39.2157],[116.2024,39.2706],[116.2024,39.342],[116.1914,39.353],[116.1145,39.3585],[116.1145,39.3805],[116.1365,39.4025],[116.1365,39.4354],[116.1475,39.4574],[116.1914,39.5013],[116.2134,39.5123],[116.2463,39.5178]]],[[[117.1582,39.8199],[117.1582,39.798],[117.1692,39.798],[117.1802,39.7815],[117.2021,39.765],[117.1692,39.7485],[117.1692,39.743],[117.1582,39.7375],[117.1582,39.7266],[117.1692,39.7156],[117.1692,39.6771],[117.1582,39.6606],[117.1802,39.6442],[117.1692,39.6387],[117.1582,39.6387],[117.1472,39.6222],[117.1362,39.6167],[117.0154,39.6552],[116.9934,39.6387],[116.9824,39.6387],[116.9714,39.6497],[116.9604,39.6442],[116.9495,39.6881],[116.9495,39.7046],[116.9165,39.7046],[116.9055,39.6881],[116.8835,39.7156],[116.8945,39.7266],[116.9165,39.7321],[116.9055,39.7485],[116.8945,39.7595],[116.9055,39.765],[116.9165,39.7815],[116.9385,39.7815],[116.9275,39.8364],[116.9055,39.8529],[116.9055,39.8419],[116.9055,39.8309],[116.8176,39.8914],[116.7957,39.8859],[116.7847,39.9463],[116.7627,39.9628],[116.7737,39.9957],[116.7737,40.0122],[116.7847,40.0287],[116.8066,40.0287],[116.8396,40.0507],[116.8506,40.0507],[116.8726,40.0397],[116.9604,40.0507],[116.9824,40.0397],[117.0264,40.0342],[117.0374,40.0507],[117.0593,40.0616],[117.0923,40.0726],[117.1143,40.0726],[117.1362,40.0616],[117.1582,40.0726],[117.1802,40.0726],[117.2131,40.0946],[117.2131,40.0836],[117.2241,40.0671],[117.1912,40.0616],[117.1802,40.0507],[117.2021,40.0012],[117.1912,39.9792],[117.1472,39.9463],[117.1582,39.9353],[117.1472,39.9353],[117.1472,39.9243],[117.1362,39.9188],[117.1582,39.9078],[117.1472,39.8969],[117.1692,39.8639],[117.1802,39.8694],[117.1802,39.8639],[117.2241,39.8529],[117.2461,39.8584],[117.2571,39.8474],[117.2461,39.8309],[117.2021,39.8309],[117.1582,39.8199]]]]}}
]
}

下面使用 Java 8 中的脚本引擎执行该代码。

package tk.mybatis;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import java.io.FileNotFoundException;
import java.io.FileReader;
public class Encoder {
  public static final ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
  static {
    try {
      //注意这里的 encode.js 路径，文件内容就是上面的 js 代码
      engine.eval(new FileReader(Encoder.class.getResource("/encode.js").getPath()));
    } catch (ScriptException e) {
      e.printStackTrace();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
  }
  public static final Invocable invocable = (Invocable) engine;
  /**
   * 压缩为 echarts 格式的地图
   * @param geoJson
   * @param fileName
   * @param type   json 或 其他（按js处理）
   * @return
   */
  public static String convert2Echarts(String geoJson, String fileName, String type) {
    try {
      return (String) invocable.invokeFunction("convert2Echarts", geoJson, fileName, type);
    } catch (ScriptException e) {
      throw new RuntimeException(e);
    } catch (NoSuchMethodException e) {
      throw new RuntimeException(e);
    }
  }
}

用法：

String json = Encoder.convert2Echarts(
  "上面提供的河北省的GeoJSON内容", "河北省", "json");

压缩后的结果如下（文件大小为 9 kb）：

{
  "type": "FeatureCollection",
  "cp": [115.4004,
  39.4688],
  "size": "1300",
  "features": [{
    "type": "Feature",
    "properties": {
      "id": "1308",
      "name": "承德市",
      "cp": [117.5757,
      41.4075],
      "childNum": 11
    },
    "geometry": {
      "type": "Polygon",
      "coordinates": ["@@lLnlmxn„„IVVlUnb@VVxXJWL@LÞŽVnnV„J˜_@wkmšK„b‚x„wXk˜WXXšKlb²K@nVVVb„L@WlU²„lKVnUJVz@VVb@lżmVUVnbôaVX@°Ub@lWbXš@b@bVb°x„@VxÈLVlšaÆ@Þb²k°@lVUŽ@Xn@VW‚LXb@¤VXšKVVVLnm°_ƨ¤@aUIVa„alkX›°k„™V@„alwUVy„U@kó™°ƒna°UVUUmUÆw@mkLVUƒWVI„WšLnn@xlVnK„myU@ƒU°UXaV@U¥ƒU@UÆ™@aVUkWU¯ƒaU@WLUV@bkbmKULmKkUVUkmVIUwlWV²™Uml°U@W„LUwVm@UUK@_ƒKUUÜaXw@ƒVKUU@mVIUUlmnIVVVbÈVlKnbVKš@nI˜@nVnwVLVK„K„„˜Vnb@aUIVW@In™°@lVnIš@lWĢ@°UVL@b„@VyUUƒa@w@WUnU@Wǯ™K@UkkJWaÛbmk@mVaÞU@amkWƒ@mXUKkÿƒ£@a„kl@Um°UXwla„al@nmlXnW°znW@aƒwV™@ƒakbĉ¥VmU@ƒIƒVƒUƒJkUmWU™KbmkUaƒKkUVU@KV@@klw—™WaU@kmƒXVènbmlUUƒKƒX¯JkbƒI@JmIUWU@ƒLml@XkJ@U™kƒK@aVKwWa—IWwƒmUƒ@mU@J@UaċU™aUUƒVkI±ƒk@UUƒ@UbVVm@UVKƒLƒlkIWaULUWƒXUJU„ƒ@WbUb@lkXUxm@@JVn@J@b„nƒb@Vkx@bšLU‚Æn„JšaVXnKVVmzX‚°V@_lJXxWXƒK¯bÅamUƒ@lUI›bñJ@LÇKkIÇ`kxWL@„ƒ@@bUVUb¯xWKk„Å„VlULW@ƒŽn¦Ul@I™lmUUUVm@kWƒnkKma¯XUKWmnwVwÝL„mŽ™VUbUVWb@Lnxm„xVŽmbXx›¦@„nb@`™„ƒVƒ@kbƒLU„mVUlkbVXkºmnm@@xk¦šbĢÜlš"],
      "encodeOffsets": [[118868,
      42784]]
    }
  },
  {
    "type": "Feature",
    "properties": {
      "id": "1307",
      "name": "张家口市",
      "cp": [115.1477,
      40.8527],
      "childNum": 15
    },
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