java 中Excel转shape file的实例详解

java  中Excel转shape file的实例详解

概述：

本文讲述如何结合geotools和POI实现Excel到shp的转换，再结合前文shp到geojson数据的转换，即可实现用户上传excel数据并在web端的展示功能。

截图：

原始Excel文件

运行耗时

运行结果

代码：

package com.lzugis.geotools;

import com.lzugis.CommonMethod;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Point;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.geotools.data.FeatureWriter;
import org.geotools.data.Transaction;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.data.shapefile.ShapefileDataStoreFactory;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.Serializable;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by admin on 2017/9/6.
 */
public class Xls2Shape {
  static Xls2Shape xls2Shp = new Xls2Shape();
  private static String rootPath = System.getProperty("user.dir");
  private CommonMethod cm = new CommonMethod();

  private HSSFSheet sheet;

  private Class getCellType(HSSFCell cell) {
    if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
      return String.class;
    } else if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
      return Double.class;
    } else {
      return String.class;
    }
  }

  private Object getCellValue(HSSFCell cell) {
    if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
      return cell.getRichStringCellValue().getString();
    } else if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
      return cell.getNumericCellValue();
    } else {
      return "";
    }
  }

  private List<Map<String, Object>> getExcelHeader() {
    List<Map<String, Object>> list = new ArrayList();
    HSSFRow header = sheet.getRow(0);
    HSSFRow value = sheet.getRow(1);
    //获取总列数
    int colNum = header.getPhysicalNumberOfCells();
    for (int i = 0; i < colNum; i++) {
      HSSFCell cellField = header.getCell(i);
      HSSFCell cellvalue = value.getCell(i);
      String fieldName = cellField.getRichStringCellValue().getString();
      fieldName = cm.getPinYinHeadChar(fieldName);
      Class fieldType = getCellType(cellvalue);
      Map<String, Object> map = new HashMap<String, Object>();
      map.put("name", fieldName);
      map.put("type", fieldType);
      list.add(map);
    }
    return list;
  }

  public void excel2Shape(String xlsfile, String shppath) {
    POIFSFileSystem fs;
    HSSFWorkbook wb;
    HSSFRow row;
    try {
      InputStream is = new FileInputStream(xlsfile);
      fs = new POIFSFileSystem(is);
      wb = new HSSFWorkbook(fs);
      sheet = wb.getSheetAt(0);
      //获取总列数
      int colNum = sheet.getRow(0).getPhysicalNumberOfCells();
      // 得到总行数
      int rowNum = sheet.getLastRowNum();

      List list = getExcelHeader();
      //创建shape文件对象
      File file = new File(shppath);
      Map<String, Serializable> params = new HashMap<String, Serializable>();
      params.put(ShapefileDataStoreFactory.URLP.key, file.toURI().toURL());
      ShapefileDataStore ds = (ShapefileDataStore) new ShapefileDataStoreFactory().createNewDataStore(params);
      //定义图形信息和属性信息
      SimpleFeatureTypeBuilder tb = new SimpleFeatureTypeBuilder();
      tb.setCRS(DefaultGeographicCRS.WGS84);
      tb.setName("shapefile");
      tb.add("the_geom", Point.class);
      for (int i = 0; i < list.size(); i++) {
        Map<String, Object> map = (Map<String, Object>) list.get(i);
        tb.add(map.get("name").toString(), (Class) map.get("type"));
      }
      ds.createSchema(tb.buildFeatureType());
      //设置编码
      Charset charset = Charset.forName("GBK");
      ds.setCharset(charset);
      //设置Writer
      FeatureWriter<SimpleFeatureType, SimpleFeature> writer = ds.getFeatureWriter(ds.getTypeNames()[0], Transaction.AUTO_COMMIT);
      //写下一条
      SimpleFeature feature = null;
      for (int i = 1; i < rowNum; i++) {
        row = sheet.getRow(i);
        feature = writer.next();
        Map mapLonLat = new HashMap();
        for (int j = 0; j < colNum; j++) {
          HSSFCell cell = row.getCell(j);
          Map<String, Object> mapFields = (Map<String, Object>) list.get(j);
          String fieldName = mapFields.get("name").toString();
          feature.setAttribute(fieldName, getCellValue(cell));
          if (fieldName.toLowerCase().equals("lon") || fieldName.toLowerCase().equals("lat")) {
            mapLonLat.put(fieldName, getCellValue(cell));
          }
        }
        feature.setAttribute("the_geom", new GeometryFactory().createPoint(new Coordinate((double) mapLonLat.get("lon"), (double) mapLonLat.get("lat"))));
      }
      writer.write();
      writer.close();
      ds.dispose();

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

  public static void main(String[] args) {
    long start = System.currentTimeMillis();
    String xlspath = rootPath + "/data/xls/capital.xls",
        shppath = rootPath + "/out/capital.shp";
    xls2Shp.excel2Shape(xlspath, shppath);
    System.out.println("共耗时" + (System.currentTimeMillis() - start) + "ms");
  }
}

说明：

1、转换仅限点对象的转换；
2、保留所有excel相关的属性，lon、lat字段是必须要有的；
3、对于中文字段，做了取首字母的处理；

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