shape文件的生成与打包下载

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

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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