参数类/*** 参数类* @author awei20081**/
public class Point2D {private double x ;private double y;public Point2D(double x,double y){this.x = x;this.y =y;}public double getX() {return x;}public void setX(double x) {this.x = x;}public double getY() {return y;}public void setY(double y) {this.y = y; }
}

请求发出与解析import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;public class getDemo {public final static void main(String[] args) throws Exception {//构建请求的URLString url="http://localhost:8090/iserver/services/map-world/rest/maps/%E4%B8%96%E7%95%8C%E5%9C%B0%E5%9B%BE/distance.rjson?";      //构造参数ArrayList<Point2D> arrayList = new ArrayList<Point2D>();arrayList.add(new Point2D(0,0));arrayList.add(new Point2D(10,10));//GET的URL,参数直接加URL后URL uri = new URL(url+URLEncoder.encode("point2Ds="+toJSONArray(arrayList),"UTF-8")+"&unit=METER");HttpGet httpget=new HttpGet(uri.toString());//执行http的get请求HttpResponse response=new DefaultHttpClient().execute(httpget);//发送GET,并返回一个HttpResponse对象，相对于POST，省去了添加NameValuePair数组作参数if(response.getStatusLine().getStatusCode()==200){//如果状态码为200,就是正常返回String result=EntityUtils.toString(response.getEntity());//得到返回的字符串JSONObject jsresult = new JSONObject(result);System.out.println("长度为"+jsresult.get("distance")+"  "+jsresult.getString("unit"));//打印输出}     }  public static StringBuilder toJSONArray(ArrayList<Point2D> arrayList){StringBuilder string = new StringBuilder();string.append("[");for (int i = 0; i < arrayList.size()-1; i++) {JSONObject jsObject = new JSONObject(arrayList.get(i));string.append(jsObject.toString()+",");}JSONObject jsObject = new JSONObject(arrayList.get(arrayList.size()-1));string.append(jsObject.toString());string.append("]");return string;}
}