写一个servlet实现gps坐标偏移接口功能

　　　　　　　　　　　　　写一个servlet实现GPS坐标偏移接口功能

这两天写了一个servlet，用于实现GPS坐标偏移接口功能。大概就是，我需要首先接收一个经纬度串数组，然后用json解析，给URL服务发送请求，服务器返回json格式的数组.

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0、需要引入json-simple-1.1的类库。

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1、GPS坐标偏移接口文档见附件

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2、具体servlet代码：

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package com.tm.gpsController;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class GPSConventCoordinateServlet extends HttpServlet {

?private static final long serialVersionUID = 3018725984829044717L;

?protected void doGet(HttpServletRequest req, HttpServletResponse resp)
???throws ServletException, IOException {

??// 我申请的key
??String a_k = "XXXXXX";

??String coors = req.getParameter("lonLatStr");

??JSONParser parser = new JSONParser();
??Object obj = "";
??try {
???obj = parser.parse(coors);
??} catch (ParseException e) {
???e.printStackTrace();
??}
??String lonLatStr = "";
??JSONArray array = (JSONArray) obj;
??for (Object j : array) {
???//
???lonLatStr = lonLatStr + ((JSONObject) j).get("lon") + ","
?????+ ((JSONObject) j).get("lat") + ";";
??}

??lonLatStr = lonLatStr.substring(0, lonLatStr.length() - 1);
??String postParam = "config=RGC&flag=true&resType=json&cr=0&coors="
????+ lonLatStr + "&a_k=" + a_k;
??System.out.println(postParam);
??// 服务地址
??String urlString = "XXXXXX";

??URL url = new URL(urlString);
??URLConnection urlc = url.openConnection();

??HttpURLConnection httpConnection = (HttpURLConnection) urlc;
??httpConnection.setRequestMethod("POST");
??httpConnection.setDoInput(true);
??httpConnection.setDoOutput(true);

??httpConnection.connect();

??OutputStreamWriter osw = new OutputStreamWriter(
????new BufferedOutputStream(httpConnection.getOutputStream()));
??osw.write(postParam);
??osw.flush();
??System.out.println();
??osw.close();
??BufferedReader br = new BufferedReader(new InputStreamReader(
????httpConnection.getInputStream()));
??String line;
??StringBuffer sbuffB = new StringBuffer();
??while ((line = br.readLine()) != null) {

???sbuffB.append(line + "\n");
???System.out.println(line);
??}
??br.close();
??httpConnection.disconnect();

?}

?@Override
?protected void doPost(HttpServletRequest req, HttpServletResponse resp)
???throws ServletException, IOException {
??doGet(req, resp);
?}

}

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3、web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
?xmlns="http://java.sun.com/xml/ns/javaee"
?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
?xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
?http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
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??? <welcome-file-list>
???????? <welcome-file>index.jsp</welcome-file>
??? </welcome-file-list>
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? <servlet>
??? <servlet-name>GPSConventCoordinateServlet</servlet-name>
??? <servlet-class>com.tm.gpsController.GPSConventCoordinateServlet</servlet-class>
? </servlet>

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? <servlet-mapping>
??? <servlet-name>GPSConventCoordinateServlet</servlet-name>
??? <url-pattern>/GPSConventCoordinateServlet</url-pattern>
? </servlet-mapping>
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</web-app>

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4、启动tomcat，部署一下，运行。

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5、在浏览器中输入

http://localhost:8080/gpsCoordinateConvent/GPSConventCoordinateServlet?lonLatStr=[{"lon":133.34,"lat":35.33},{"lon":134.33,"lat":34.33]进行测试。

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6、在控制台输出返回的信息{"message":"ok","list":[{"gridcode":"873482645301","y":"582.5422219509549","x":"582.5422219509549"},{"gridcode":"873482645301","y":"582.5422219509549","x":"582.5422219509549"}]}　就对了

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7、注意　在浏览器中输入的参数lonLatStr=[{"lon":133.34,"lat":35.33},{"lon":134.33,"lat":34.33]　参数格式有时候输入的特殊，服务器端就会返回一个默认的返回的结果。"[{"gridcode":"873482645301","y":"582.5422219509549","x":"582.5422219509549"}，这时候，其实程序是没有问题的，只需要改一下参数，就可以了。