概述
本文讲述如何在OL中结合GeoTools实现shp数据的上传与展示。
流程
shp上传展示流程图
实现效果
面
线
点
使用技术
- jquery插件uploadify和ServletFileUpload实现shp文件的上传；
- ZipFile实现zip文件的解压；
- Geotools实现shp文件转换为geojson；
- openlayers4实现数据的展示。
实现代码
1、前端代码
shp文件
2、后端代码
package com.lzugis.web.servlet;
import com.lzugis.helper.CommonMethod;
import com.lzugis.services.utils.ShpFormatUtil;
import com.lzugis.services.utils.ZipUtil;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.json.simple.JSONObject;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Created by admin on 2017/9/10.
*/
@WebServlet(description = "shp file upload", urlPatterns = {"/shp-upload"})
public class FileUploadServlet extends HttpServlet {
private String rootPath = "";
private ZipUtil zipUtil;
private ShpFormatUtil shpUtil;
private CommonMethod cm;
public FileUploadServlet() {
super();
rootPath = "D:\\shppath\\";
zipUtil = new ZipUtil();
shpUtil = new ShpFormatUtil();
cm = new CommonMethod();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
//1、创建一个DiskFileItemFactory工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
//2、创建一个文件上传解析器
ServletFileUpload upload = new ServletFileUpload(factory);
//限制单个文件大小为1M
upload.setFileSizeMax(1024*1024);
//限制整个表单大小为1G
upload.setSizeMax(1024*1024*1024);
//解决上传文件名的中文乱码
upload.setHeaderEncoding("UTF-8");
factory.setSizeThreshold(1024 * 500);//设置内存的临界值为500K
File linshi = new File(rootPath);//当超过500K的时候，存到一个临时文件夹中
factory.setRepository(linshi);
upload.setSizeMax(1024 * 1024 * 10);//设置上传的文件总的大小不能超过5M
Map result = new HashMap<>();
try {
// 1. 得到 FileItem 的集合 items
List /* FileItem */items = upload.parseRequest(request);
// 2. 遍历 items:
for (FileItem item : items) {
// 若是一个一般的表单域, 打印信息
if (item.isFormField()) {
String name = item.getFieldName();
String value = item.getString("utf-8");
System.out.println(name + ": " + value);
}
// 若是文件域则把文件保存到 e:\\files 目录下.
else {
String fileName = item.getName();
long sizeInBytes = item.getSize();
// System.out.println(fileName);
// System.out.println(sizeInBytes);
InputStream in = item.getInputStream();
byte[] buffer = new byte[1024];
int len = 0;
//文件最终上传的位置
fileName = rootPath + fileName;
OutputStream out = new FileOutputStream(fileName);
while ((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
out.close();
in.close();
String shpPath = zipUtil.unZipFiles(fileName, rootPath);
System.out.println("shp path"+shpPath);
StringBuffer json = shpUtil.shp2Json(shpPath);
result.put("status", "200");
result.put("geojson", json.toString());
// cm.append2File(rootPath + "json.json", json.toString());
JSONObject.writeJSONString(result, response.getWriter());
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
}
}
···
3、zip解压类
```java
package com.lzugis.services.utils;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
public class ZipUtil {
/**
* 解压文件到指定目录
* 解压后的文件名，和之前一致
* @param zipPath 待解压的zip文件路径
* @param descDir 指定目录
*/
@SuppressWarnings("rawtypes")
public String unZipFiles(String zipPath, String descDir) throws IOException {
String shpPath = "";
File zipFile = new File(zipPath);
ZipFile zip = new ZipFile(zipFile, Charset.forName("GBK"));//解决中文文件夹乱码
String name = zip.getName().substring(zip.getName().lastIndexOf('\\')+1, zip.getName().lastIndexOf('.'));
File pathFile = new File(descDir+name);
if (!pathFile.exists()) {
pathFile.mkdirs();
}
for (Enumeration entries = zip.entries(); entries.hasMoreElements();) {
ZipEntry entry = (ZipEntry) entries.nextElement();
String zipEntryName = entry.getName();
InputStream in = zip.getInputStream(entry);
String outPath = (descDir + name +"/"+ zipEntryName).replaceAll("\\*", "/");
// 判断路径是否存在,不存在则创建文件路径
File file = new File(outPath.substring(0, outPath.lastIndexOf('/')));
if (!file.exists()) {
file.mkdirs();
}
// 判断文件全路径是否为文件夹,如果是上面已经上传,不需要解压
if (new File(outPath).isDirectory()) {
continue;
}
// 输出文件路径信息
FileOutputStream out = new FileOutputStream(outPath);
if(outPath.substring(outPath.length()-3,outPath.length()).equals("shp")){
shpPath = outPath;
}
byte[] buf1 = new byte[1024];
int len;
while ((len = in.read(buf1)) > 0) {
out.write(buf1, 0, len);
}
in.close();
out.close();
}
return shpPath;
}
}
4、shp文件转换
package com.lzugis.services.utils;
import com.amazonaws.util.json.JSONArray;
import com.amazonaws.util.json.JSONObject;
import com.vividsolutions.jts.geom.Geometry;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.geojson.feature.FeatureJSON;
import org.opengis.feature.simple.SimpleFeature;
import java.io.File;
import java.io.StringWriter;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.Map;
public class ShpFormatUtil {
public StringBuffer shp2Json(String shpPath){
StringBuffer sb = new StringBuffer();
FeatureJSON fjson = new FeatureJSON();
try{
sb.append("{\"type\": \"FeatureCollection\",\"features\": ");
File file = new File(shpPath);
ShapefileDataStore shpDataStore = null;
shpDataStore = new ShapefileDataStore(file.toURL());
//设置编码
Charset charset = Charset.forName("GBK");
shpDataStore.setCharset(charset);
String typeName = shpDataStore.getTypeNames()[0];
SimpleFeatureSource featureSource = null;
featureSource = shpDataStore.getFeatureSource (typeName);
SimpleFeatureCollection result = featureSource.getFeatures();
SimpleFeatureIterator itertor = result.features();
JSONArray array = new JSONArray();
while (itertor.hasNext())
{
SimpleFeature feature = itertor.next();
Geometry geo = (Geometry) feature.getAttribute("the_geom");
StringWriter writer = new StringWriter();
fjson.writeFeature(feature, writer);
JSONObject json = new JSONObject(writer.toString());
array.put(json);
}
itertor.close();
sb.append(array.toString());
sb.append("}");
}
catch(Exception e){
e.printStackTrace();
}
return sb;
}
}
技术博客
CSDN：http://blog.csdn.NET/gisshixisheng
博客园：http://www.cnblogs.com/lzugis/
在线教程
http://edu.csdn.Net/course/detail/799
Github
https://github.com/lzugis/
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