概述

本文讲述如何结合Geotools实现后端shp文件的生成与打包下载。

实现效果

生成文件 压缩文件

实现

1. shp文件生成
   如何生成shp文件在前面的相关博文里面已经做过说明，本文不再赘述。

2. shp文件打包
   对与一个shp文件来说，下面四个文件是必须的：.dbf、.prj、.shp、.shx，其中：
   1）.dbf为属性文件；
   2）.prj为投影文件；
   3）.shp为空间信息存储文件；
   4）.shx为图形文件；

3. 实现代码

1. shp生成与打包

package com.lzugis.helper;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Point;
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.*;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ShapeHelper {

    public ShapeHelper(){
        super();

    }

    public void write2ShapeFile(String shpPath, String[] header, List data){
        try{
            //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<header.length;i++){
                String field = header[i];
                tb.add(field.toUpperCase(), String.class);
            }
            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);
            //写入文件信息
            for(int i=0;i<data.size();i++){
                SimpleFeature feature = writer.next();
                Map<String, Object> row = (Map)data.get(i);
                Geometry geom = new GeometryFactory().createPoint(new Coordinate((Double)row.get("x"), (Double)row.get("y")));
                feature.setAttribute("the_geom", geom);
                for (Map.Entry entry : row.entrySet()) {
                    feature.setAttribute(entry.getKey().toString().toUpperCase()
                            , entry.getValue());
                }
            }
            writer.write();
            writer.close();
            ds.dispose();

            //添加到压缩文件
            zipShapeFile(shpPath);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    public void zipShapeFile(String shpPath){
        try{
            File shpFile = new File(shpPath);
            String shpRoot = shpFile.getParentFile().getPath(),
                    _shpName = shpFile.getName(),
                    shpName = _shpName.substring(0, _shpName.lastIndexOf("."));

            String zipPath = shpRoot+File.separator+shpName+".zip";
            File zipFile = new File(zipPath);
            InputStream input = null;
            ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipFile));
            // zip的名称为
            zipOut.setComment(shpName);
            String[] shpFiles = new String[]{
                    shpRoot+File.separator+shpName+".dbf",
                    shpRoot+File.separator+shpName+".prj",
                    shpRoot+File.separator+shpName+".shp",
                    shpRoot+File.separator+shpName+".shx",
            };
            for(int i=0;i<shpFiles.length;i++){
                File _file = new File(shpFiles[i]);
                input = new FileInputStream(_file);
                zipOut.putNextEntry(new ZipEntry(_file.getName()));
                int temp = 0;
                while ((temp = input.read()) != -1) {
                    zipOut.write(temp);
                }
                input.close();
            }
            zipOut.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

2） shp文件下载

    @RequestMapping(value="geocode/down")
    public void downGeocodePois(String type, HttpServletResponse response){
        try {
            String downFile = geoService.getDownFile(type);
            File file = new File(downFile);
            String filename = file.getName();// 获取日志文件名称
            InputStream fis = new BufferedInputStream(new FileInputStream(file));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            response.reset();
            // 先去掉文件名称中的空格,然后转换编码格式为utf-8,保证不出现乱码,这个文件名称用于浏览器的下载框中自动显示的文件名
            response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.replaceAll(" ", "").getBytes("utf-8"),"iso8859-1"));
            response.addHeader("Content-Length", "" + file.length());
            OutputStream os = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/octet-stream");
            os.write(buffer);// 输出文件
            os.flush();
            os.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }

---

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